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LW3DBH > ALERT 06.04.20 02:30z 75 Lines 3676 Bytes #999 (0) @ WW
BID : 60362_LW3DBH
Read: GUEST
Subj: Storm Prediction Center 05 04
Path: HB9ON<IW8PGT<LU4ECL<LW3DBH
Sent: 200406/0208Z @:LW3DBH.1744.BA.ARG.SA #:60362 [MORENO] FBB7.00i $:60362_LW
From: LW3DBH@LW3DBH.1744.BA.ARG.SA
To : ALERT@WW
_ __ _______ ____ ____ _ _
| |\ \ / /___ /| _ \| __ )| | | | BBS
| | \ \ /\ / / |_ \| | | | _ \| |_| | MORENO
| |__\ V V / ___) | |_| | |_) | _ | ARGENTINA
|_____\_/\_/ |____/|____/|____/|_| |_|
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MD 0288 CONCERNING HEAVY SNOW FOR SIERRA NEVADA MOUNTAINS
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
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0742
PM CDT Sun Apr 05 2020
Valid 060100Z - 061200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY... The risk for severe thunderstorms is expected to
remain negligible across the U.S. through tonight.
...01z Outlook Update...
Weak high-based convection near the central and southern Appalachians
has still been occasionally producing lightning the past hour or so.
However, this activity appears to be the lingering remnants of
convection largely driven by daytime heating and orographic forcing,
and probabilities for continuing development through and beyond
01Z are becoming increasingly negligible.
Otherwise, widely scattered, generally weak thunderstorm activity
continues beneath cold mid-level air to the east of a slowly digging
mid-level closed low near the northern/central California coast,
as well as around the crest of downstream ridging across parts of
the northern Intermountain West and Rockies into the north central
High Plains. This may persist another hour or two, before the risk
for thunderstorm activity becomes increasingly negligible across
most areas. However, weak elevated moisture return and lower/mid
tropospheric warm advection could support a few weak thunderstorms
overnight across parts of the eastern Dakotas into western Minnesota.
..Kerr.. 04/06/2020
+----------------------------------------------------------------------------+
The goys have proven the following theorem...
-- Physicist John von Neumann, at the start of a classroom
lecture.
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