Warm air at treeline and above combined with sun may cause cornices to weaken and fall. Be cautious near or under cornices.
Cornices have grown very large and unsupported.  They are increasingly likely to fail, providing a trigger for large avalanches.  Northerly winds have created reverse loading in some areas.
Cornices have grown very large and unsupported. They are increasingly likely to fail, providing a trigger for large avalanches. Northerly winds have created reverse loading in some areas.
Cornices have grown very large and unsupported. They are increasingly likely to fail, especially during periods of strong sun or warming, providing a trigger for large avalanches. Northerly winds have created reverse loading in some areas.
Cornices have grown very large and unsupported. Strong sun today will weaken them. Cornice failures are expected, and are in themselves a concern. Should these large loads trigger deeper layers, very large destructive avalanches are possible.
Look up lots today and avoid slopes with cornices above them. Cornice failures are expected due to daytime warming or by people traveling along ridges. A section of cornice hurtling down slope is a real concern, it may also trigger slab avalanches.
Look up lots today and avoid slopes with cornices above them. Cornice failures are expected due to daytime warming or by people traveling along ridges. A section of cornice hurtling down slope is a real concern, it may also trigger slab avalanches.
Cornices are large and unsupported. Wide fluctuations in diurnal temperatures is likely increasing their fragility.  Ski tracks on the Sifton Traverse yesterday passed within arms reach of van-sized cornice chunks, with densities of ice.  Yikes!
Cornices are large and unsupported. Wide fluctuations in diurnal temperatures are increasing their fragility.  If the cornice doesn't get you, the resulting avalanche may.  Reports of cornice triggered slides to size 4.5 have been reported!
Cornices are large and unsupported. Wide fluctuations in diurnal temperatures are increasing their fragility and very warm afternoon temps will make them weaker.  Cornice triggered large avalanches are possible. 
Cornices are large and unsupported. Large swings in day/night temperatures increases their fragility. Very warm afternoon temps will make them weaker. Cornice triggered large avalanches are possible.
Cornices are large and unsupported. Large swings in day/night temperatures increases their fragility. Cornice triggered large avalanches are possible.
Cornices are large and unsupported. They are more likely to fail with solar warming, and may trigger deeper slabs.
Cornices are large and unsupported. They are more likely to fail with solar warming, and may trigger deeper slabs.
Cornices are large and unsupported. They are more likely to fail with solar warming, and may trigger deeper slabs.
Cornices are large and unsupported. They are weak from the warm temperatures, and if they fail, may trigger deeper slabs.
Cornices are large and unsupported. They are weak from the warm temperatures, and if they fail, may trigger deeper slabs.
Cornices are large and unsupported. They are weak from the warm temperatures, and the warm wet new snow. If they fail, they may trigger deeper slabs.
Cornice are large on many ridgelines in the park.  A cornice fall could trigger a slab avalanche.  Minimize your exposure to this hazard, especially in the afternoon as temperature rise.
Beware the overhanging cheeseburgers along the ridgetops! If this inversion becomes as strong as forecasted, we may not see alpine temp's drop overnight, creating unstable cornices heating up in the afternoon sun.
Be aware of cornices looming overhead. Warm temps and strong solar radiation are expected in the alpine and will likely cause some cornices to come crashing down.
Current conditions are ideally suited for increased cornice fall hazard. Be aware that although you may be on a shaded slope the cornice above may be getting baked in the sun.
The cornices have undergone tremendous growth in the past week with all the new snow and winds. These cornices could be the large load to trigger the thick slabs overlying the Feb 10th interface. Expect large avalanches if caused by cornice-fall!
The large cornices adorning ridge-tops are the large, natural trigger that could initiate a very large avalanche. They are obvious overhead hazards to be avoided for the next long while.
Yesterday, a slab 1-1.5 meters deep was observed that was triggered by cornice failure. Large cornices exist along ridges, and are may fail with fluctuating temperatures and sunny periods. These are big triggers that could initiate BIG avalanches.&nbsp;
Yesterday, a slab 1-1.5 meters deep was observed that was triggered by cornice failure. Large cornices exist along ridges, and may fail with fluctuating temperatures and sunny periods. These are heavy triggers that could initiate BIG avalanches.
Large cornices exist along ridges, and may fail with fluctuating temperatures and sunny periods. These are heavy triggers that could initiate BIG avalanches.
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</style><p class="p_CC664AAA"><span class="s_AA239A9B"> </span><span class="s_E6FD2046">Cornices have grown from the last storm cycle. Sunshine and the warmer alpine temperatures may cause them to break. Shaded slopes may have cornices in the sun well above you. This hazard is the type of load that can trigger the buried weak layers.
The large cornices adorning the ridge-crests will see lots of sunshine and warming today, potentially destabilizing them and causing them to fall. The mass of these &quot;freight-trains&quot; smacking the slope could be the trigger to start a very large slide.
Cornices are a definite concern, given their size and mass. If they were to fail, they could be the big trigger to initiate an avalanche in the deeper layers.
Cornices may be destabilized by fluctuating temperatures. If they fail, they could be the big trigger to initiate an avalanche in the deeper layers.
Cornices may destabilize by fluctuating temperatures.  If they fail, they could be the big trigger to initiate an avalanche in the deeper layers.
Cornices have grown from the last storm. Strong solar radiation with warming temperatures will mean an increased hazard of cornice fall for today and tomorrow.
Cornices will also feel a little heavier today with sun and warming. Give them a wide berth. A party of 4 nearly went tumbling off Castor Peak's west ridge when they triggered a cornice that they were standing on.
Large cornices still linger along ridge-crests. These beasts have the potential to trigger deeper layers, so give them a healthy dose of respect and steer clear of them.
Manage your groups exposure to the overhead cornice hazard. Remember that even though you may be on a shaded north aspect, if there's a cornice above you on the ridge it will be baking in the sun.
The spring-time cornices are large and looming overhead. They weaken with sunshine and warming temperatures, so plan your day to be away from them as things warm up.
Large cornices throughout the Park will be taking in a good dose of solar radiation today for the first time. Manage your groups exposure to this overhead hazard even on shaded slopes as the cornices above are still in the sun.
Large cornices throughout the Park will be getting more solar radiation today. Manage your groups exposure to this overhead hazard even on shaded slopes as the cornices above are still in the sun.
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</style><p class="p_CC664AAA"><a href="https://www.facebook.com/ParksMountainSafety/photos/a.778767212173270.1073741874.145133538869977/791098590940132/?type=1&amp;theater" target="_blank"><span class="s_9255B882">Impressive avalanches </span></a><span class="s_AA239A9B">have been triggered recently by cornices falling on slopes, some failing to deep basal layers. Minimize exposure to slopes with cornices above even if you are in the shade, as the cornices above are still in the sun.
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</style><p class="p_CC664AAA"><a href="https://www.facebook.com/ParksMountainSafety/photos/a.778767212173270.1073741874.145133538869977/791098590940132/?type=1&amp;theater" target="_blank"><span class="s_9255B882">Impressive avalanches </span></a><span class="s_AA239A9B">have been triggered recently by cornices falling on slopes, some failing to deep basal layers. Minimize exposure to slopes with cornices and use caution while traveling along ridges.
We are expecting more solar radiation today and higher freezing levels. These conditions will weaken the large cornices that loom on ridgetops.
Warm afternoon temps and lots of solar will weaken the large cornices that exist in many areas. Recently, cornice failures have been the primary trigger of slab avalanches.
Warm afternoon temps and lots of solar are causing cornice failures, which is the primary trigger of recent slab avalanches. Even if they don't trigger an avalanche, a car sized block of cornice hurtling downslope is worth avoiding.
Temperatures may be cooling but cornices are still the main problem in Rogers Pass. Recent cornice failures have triggered persistent instabilities buried deep in the snowpack. The resulting avalanches are large with serious destructive potential.
New snow and strong winds at ridgetop have caused the existing cornices to grow even larger. Today they will be weakened by strong solar. Large cornice failures have been observed recently, sometimes triggering very large deep slab avalanches.
Cornices are being stressed by the warm temp's and grew quite large during the last storm. If they drop, they could trigger deeper weak layers and cause large avalanches.
New snow and strong winds have contributed to cornice development. Warm temperatures and periods of sun may be enough to cause cornices to fail today. Cornice failures have potential to trigger persistent slabs on slopes below, with big consequences.
New snow and strong winds have contributed to cornice development. Warm temperatures and periods of sun may be enough to cause cornices to fail today. Cornice failures have potential to trigger persistent slabs on slopes below, with big consequences.
Large cornices have been formed by strong winds and storm snow.  Warm temperatures and continued loading may be enough to cause cornice failure.  Cornice fall has the potential to trigger persistent slabs on slopes below with large consequences.
Recent wind and storm snow has contributed to rapid cornice formation. Cornice fall has the potential to trigger the persistent weak layer resulting in larger avalanches.
Recent wind and storm snow has contributed to rapid cornice formation. Cornice fall can be difficult to predict but is usually related to sudden heating or new loading.&nbsp; Cornice weight could trigger the deep layers resulting in larger avalanches.
The additional storm snow, accompanied by SW winds and mild temp's, has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests.
The additional storm snow, accompanied by SW winds and mild temp's, has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests. A cornice triggered avalanche on Parsons Peak dug down to ice
The additional storm snow, accompanied by SW winds and mild temp's, has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests. A cornice triggered avalanche on Parsons Peak dug down to ice
Additional storm snow accompanied by SW winds has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests and be mindful of overhead hazard when the intense spring sun is shining.
Ripe cornices have been failing over the past several days resulting in some large slides. Avoid exposure to this overhead hazard.
Large cornices exist on many ridges. Rapid changes, from very cold overnight to being beat on by strong solar may cause them to fail. A falling cornice is likely to trigger deeper layers and cause large avalanches.
Large cornices exist on many ridges. Rapid changes, from very cold overnight to being beat on by strong solar may cause them to fail. A falling cornice is likely to trigger deeper layers and cause large avalanches.
Occurrences of cornice failures triggering persistent weak layers are on the rise.  Daytime warming and solar radiation increase the sensitivity of this avalanche problem. Avoid slopes (and run-out zones) that are subject to overhead hazard.
Ripe cornices are sporadically failing triggering persistent weak layers.  Freezing levels are forecast to rise to 2500m keeping cornices touchy today.  Avoid slopes below these overhead hazards.
The late March cornices are large. Keep an eye on them and avoid exposing your party to these looming overhead hazards.
Large cornices are an ongoing concern with warmer temperatures. Even small cornice failures can trigger large avalanches.
Large cornices are an ongoing concern with warmer temperatures and the strong March sunshine. Even small cornice failures can trigger large avalanches.
Large cornices are an ongoing concern with warmer temperatures and the strong March sunshine. Even small cornice failures can trigger large avalanches.
The strong solar will weaken cornices, which are very large on many ridges. Cornice failures are likely triggers for deeply buried weak layers and can trigger large avalanches.
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</style><p class="p_CC664AAA"><span class="s_2823317B">Solar and warm temps will weaken cornices</span><span class="s_AA239A9B">, which are very large on many ridges. Cornice failures are likely triggers for deeply buried weak layers.&nbsp; There has been a number of near misses recently where people have gotten too close to cornice edges.
Very warm temperatures and strong solar may weaken large cornices that exist along many ridges. Cornice failures are likely triggers for deeply buried weak layers and may trigger very large avalanches.
Very warm temperatures may weaken large cornices that exist along many ridges. Sagging cornices may have thinly-bridged cracks to windward which pose a serious hazard. Cornice failures can trigger deeply buried weak layers leading to large slides.
Very warm temperatures may weaken large cornices that exist along many ridges. Cornice size &amp; extent can is difficult to asses and should be done cautiously giving a wide margin.</span></p><p class="p_CC664AAA"><span class="s_AA239A9B">
Very warm temperatures may weaken large cornices that exist along many ridges. New snow and moderate ridgetop winds will also add fresh growth. Cornice size &amp; extent can is difficult to asses and should be done cautiously giving a wide margin.</span></p><p class="p_CC664AAA"><span class="s_AA239A9B">
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Cornices along ridges will be weakened by the strong sun and warm temps. Serac fall has also been observed recently. Pieces of cornice or ice tumbling down are concerns in their own right, but these can trigger larger avalanches once on the slope. 
Cornices along ridges will be weakened by the sun &amp; warm temps. Serac fall from glaciers has also been observed recently. Pieces of cornice or ice crashing down are concerns in their own right but these can trigger larger avalanches once on the slope
Cornices along ridges will be weakened by the sun &amp; warm temps. Serac fall from glaciers has also been observed recently. Pieces of cornice or ice crashing down are concerns in their own right but these can trigger larger avalanches once on the slope
Warm temperatures, moderate to strong southerly winds, and plenty of snow for transport are building large cornices at ridge-top. The fresh cornices will be very fragile and could trigger deep slabs.
The week's worth of warm snow with constant SW winds has built up some very large cornices along ridge-tops. These beasts should be considered fragile and they would be a HUGE trigger to start a large avalanche.
Abundant warm snow with constant SW winds has built up some very large cornices along ridge-tops. These beasts are fragile, HUGE triggers with the potential to start large avalanches. They will become even more fragile with solar warming today.
Lots of snow combined with strong winds rapidly added to cornices. Cornice failures continue to be observed daily, and have been the trigger for many large deep avalanches.
Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
Cornices are very large right now and can fail unpredictably - if this happens persistent weak layers deep in the snowpack can be triggered, resulting in very large avalanches.
The large cornices hanging on the ridge-lines are fragile and they pack a monster punch if they fail on the slopes below. These massive triggers have the potential to trigger deeper layers and cause very large avalanches.
Large cornices hanging along lee ridge lines are fragile and pack a major punch if they fail onto the slopes below. Cornices have potential to trigger deeper weak layers and cause very large avalanches. Solar input will increase chance of failure.
Cornices are large and are failing sporadically and almost daily. These large triggers are capable of triggering persistent weak layers resulting in large slides.
Huge cornices loom at ridgetop and have been failing unpredictably. When they drop they provide large triggers for deep, persistent weak layers. The resulting avalanches have been observed to run well into the valley bottoms.
Large cornices guard the high alpine ridges and are HUGE. If these fail, due to direct sun, human loading, or wind loading, they could dig down into the snowpack and trigger deep persistent slabs. Always keep an eye on the high alpine ridges.
HUGE cornices guard the high alpine ridges and they keep growing. If they fail due to direct sun, human loading, or wind loading, they could trigger deep persistent slabs. Even if they don't, that bus sized chunk trundling down is concern in itself.
Cornices are always unpredictable! However we are seen cornices fail in the HWY corridor and in the back country on a semi regular basis. With minimal natural triggers today, back country enthusiasts would be the likely trigger.
Cornices are always unpredictable! However we are seen cornices fail in the HWY corridor and in the back country on a semi regular basis. With naturals triggers easing, back country enthusiasts would be the likely trigger.
The cornices are as big as they are going to get. Predicting their failure is tricky, but warming, heavy intense loading, or direct sun will weaken them. They have triggered some very large natural avalanches in and near Rogers Pass recently.
The cornices are as big as they are going to get. Predicting their failure is tricky, but warming, heavy intense loading, or direct sun will weaken them. They have triggered some very large natural avalanches in and near Rogers Pass recently.
Cornices have become reactive in the last week. Strong winds, fluctuating temperatures and significant snowfall has contributed to these loitering hazards failing.
Cornices have become reactive in the last week. Strong winds, fluctuating temperatures and significant snowfall has contributed to these loitering hazards failing.
Cornices have become reactive in the last week. Strong winds, fluctuating temperatures, significant snowfall and strong solar radiation has contributed to these loitering hazards failing.
Cornices have been failing steadily over the past week.  Cold temperatures and solar input are contributing to these failures with brittle fractures of the snow as temperatures fluctuate.
Cornices have been failing steadily over the past week. Cold temperatures and solar input are contributing to these failures with brittle fractures of the snow as temperatures fluctuate.
Cornices have been failing over the past week, cold temperatures and solar input are contributing to these failures with brittle fractures of the snow as temperatures fluctuate.
Cornices have been failing over the past week, cold temperatures and solar input are contributing to these failures with brittle fractures of the snow as temperatures fluctuate.
Large cornices are hanging off ridge lines and will weaken with daytime warming and intense solar radiation. Minimize your exposure to these looming hazards.
Cornices are hard to predict and have been sporadically failing in the park triggering avalanches to size 2.5. New snow, wind and temperature increases are a great recipe for cornice triggered avalanches.
Cornices are hard to predict and have been sporadically failing in the park triggering avalanches to size 2.5. New snow, wind and temperature increases are a great recipe for cornice triggered avalanches.
Cornices are hard to predict and have been sporadically failing in the park triggering avalanches to size 2.5. New snow, wind and temperature increases are a great recipe for cornice triggered avalanches.
Warm air at treeline and above combined with sun may cause cornices to weaken and fall. Be cautious near or under cornices.
Cornices have grown very large and unsupported.  They are increasingly likely to fail, providing a trigger for large avalanches.  Northerly winds have created reverse loading in some areas.
Cornices have grown very large and unsupported. They are increasingly likely to fail, providing a trigger for large avalanches. Northerly winds have created reverse loading in some areas.
Cornices have grown very large and unsupported. They are increasingly likely to fail, especially during periods of strong sun or warming, providing a trigger for large avalanches. Northerly winds have created reverse loading in some areas.
Cornices have grown very large and unsupported. Strong sun today will weaken them. Cornice failures are expected, and are in themselves a concern. Should these large loads trigger deeper layers, very large destructive avalanches are possible.
Cornices are large and unsupported. They are weak from the warm temperatures, and if they fail, may trigger deeper slabs.
Cornices are large and unsupported. They are weak from the warm temperatures, and the warm wet new snow. If they fail, they may trigger deeper slabs.
The additional storm snow, accompanied by SW winds and mild temp's, has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests. A cornice triggered avalanche on Parsons Peak dug down to ice
The additional storm snow, accompanied by SW winds and mild temp's, has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests. A cornice triggered avalanche on Parsons Peak dug down to ice
Additional storm snow accompanied by SW winds has allowed cornices to grow and become fragile. Limit your exposure to these overhanging beasts along the ridge crests and be mindful of overhead hazard when the intense spring sun is shining.
Ripe cornices have been failing over the past several days resulting in some large slides. Avoid exposure to this overhead hazard.
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches
Huge cornices along ridges will be weakened by the strong sun today and continued above freezing temps. A chunk of cornice tumbling down-slope is a concern in itself, but cornices failures also provide a heavy trigger and may trigger large avalanches