Persistent weak layers include surface hoar, depth hoar, near-surface facets, and faceted crusts. These layers can vary greatly over short distances and continue to produce avalanches weeks or even months after burial. Persistent Slabs are characterized by difficult to manage and often surprising behavior. They can be triggered long after a storm has passed or release under modest loading events. They may be triggered remotely—from flatter terrain below, above, and to the sides of steep slopes.
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A weak layer of surface hoar, facets and/or suncrust (Jan 30th) is 20-50cm down. Snowpack tests conducted on a North aspect at 1700m indicate that this layer will be easily triggered and capable of producing large avalanches. Watch out when this layer gets overloaded this weekend! Video: Extended Column Test Propagation on 4 hits, Mt Smart in Rogers Pass, Glacier National Park. | Mountain Safety, Parks Canada
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A weak layer of surface hoar, facets and/or suncrust (Jan 30th) is 20-5…
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Each crystal spike of surface hoar is sparkling like its own tiny ice cathedral out at Guthega today!❄️✨📷 @mjdphotosdotcom #Guthega #SnowyMountains #SurfaceHoar #WinterWonder #BackcountryNSW | For the Love of Jindabyne
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Each crystal spike of surface hoar is sparkling like its own tiny ice cath…
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We are still looking for surface hoar under the new snow. We suspect it is preserved in most parts of the South Rockies region. The distribution might be spotty, but it is most likely found on north aspects, sheltered areas, and places that haven’t been hit by the wind. | Avalanche Canada South Rockies
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We are still looking for surface hoar under the new snow. We suspect i…
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We found surface hoar buried by 4-6” of recent snow in the Taylor Fork today. Once it gets buried a bit deeper by new or drifting snow we expect to see avalanches start breaking on this layer. This weekend’s snow could push us past that threshold in some places. Check mtavalanche.com/forecast for the latest conditions before heading out. | Friends of the Gallatin National Forest Avalanche Center
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We found surface hoar buried by 4-6” of recent snow in the Taylor Fo…
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We rode into the Centennial Range today (1/17) hunting for the surface hoar layer. This weak layer's distribution is spotty, but surface hoar is not to be trusted. We recommend digging three feet deep to look for and test this layer before riding any steep terrain. #GNFACObs | Friends of the Gallatin National Forest Avalanche Center
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