Mesoscale Discussion 0288
   NWS Storm Prediction Center Norman OK
   0523 PM CDT Sun Apr 05 2020

   Areas affected...Sierra Nevada Mountains

   Concerning...Heavy snow 

   Valid 052223Z - 060430Z

   SUMMARY...Long-duration heavy snow event for the Sierra Nevada is
   expected to persist well into the overnight period. Snowfall rates
   of 2-3 inches/hour should be common this evening through tonight,
   gradually shifting south from the northern into the central and
   southern portions of the mountain range.

   DISCUSSION...Robust orographic ascent is well underway amid strong
   deep-layer south-southwest flow downstream of a potent upper-level
   shortwave trough just off the northern CA coast. Heavy snow is
   ongoing across the I-80 and US-50 corridors along the northern
   periphery of a low-topped lightning-producing squall over the
   Central Valley. Potential will exist for additional squall
   development into the northern portion of the San Joaquin Valley this
   evening, which would further aid in enhancing heavy snow rates over
   higher terrain. A slow southward shift in the axis of heavy snow
   rates is consistently progged by short-term guidance from north to
   south. Most locations will likely experience many hours of heavy
   snow before weakening of upslope flow occurs during the early
   morning Monday.

   ..Grams.. 04/05/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...VEF...REV...HNX...STO...

   LAT...LON   39272090 39512094 39592076 39362052 38882006 38191946
               37651894 37031841 36491847 36431868 37141918 37541967
               38082015 38742058 39272090