Administrators NorthGeorgiaWX Posted January 13 Administrators Share Posted January 13 MD 0061 CONCERNING HEAVY SNOW FOR NORTHWESTERN OREGON AND FAR SOUTHEASTERN WASHINGTON Mesoscale Discussion 0061 NWS Storm Prediction Center Norman OK 0205 PM CST Sat Jan 13 2024 Areas affected...Northwestern Oregon and far southeastern Washington Concerning...Heavy snow Valid 132005Z - 140000Z SUMMARY...Periods of heavy snow with snowfall rates between 1-2 in/hour will continue into the mid/late afternoon hours. Freezing rain remains probable through the Willamette Valley. DISCUSSION...Bands of moderate to heavy precipitation continue to overspread the Pacific Northwest ahead of an approaching mid-level wave. So far, much of this activity has been driven by warm advection in the 850-700 mb layer, but some uptick in precip coverage and intensity appears likely as lift associated with the vorticity maximum and attendant mid-level jet overspreads the region. The 18z SLE sounding sampled a deep saturated layer from the surface to around 450 mb with a somewhat shallow (~100 mb deep) 1-2 C warm nose centered at about 850 mb/3 kft. More recent KRTX CC imagery indicates that this warm nose remains in place. Locations above roughly 3 kft should continue to see moderate to heavy snowfall through the mid/late afternoon with snowfall rates between 1-2 in/hour possible. The shallow sub-freezing layer below ~3 kft will support a continuation of freezing rain for some locations - primarily through the Willamette Valley. However, localized fluctuations in the shallow warm layer may promote variation in precipitation types between freezing rain, snow, and sleet. ..Moore.. 01/13/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...PDT...MFR...SEW...PQR... LAT...LON 44192375 44442423 44642418 46032410 46212399 46392363 46352107 46182067 45762021 45001991 44212004 43732038 43532087 43462157 43772338 44192375 Read more View the full article Quote Link to comment Share on other sites More sharing options...
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