This is a multi-part message in MIME format...

------------=_1639108206-76136-5932
Content-Type: text/plain
Content-Transfer-Encoding: Quoted-printable

ACUS11 KWNS 100349
SWOMCD
SPC MCD 100349=20
NEZ000-SDZ000-WYZ000-100845-

Mesoscale Discussion 1974
NWS Storm Prediction Center Norman OK
0949 PM CST Thu Dec 09 2021

Areas affected...Parts of eastern Wyoming...southern South
Dakota...and northern Nebraska

Concerning...Heavy snow=20

Valid 100349Z - 100845Z

SUMMARY...Heavy snow with rates of 1-1.5 in/hr are expected to
develop tonight from eastern Wyoming and spread east-northeastward
across southern South Dakota and northern Nebraska.

DISCUSSION...A band of strong low/mid-level warm air advection
preceding a deepening low-pressure system over eastern Colorado will
gradually overspread portions of the central Great Plains during the
overnight hours. As the increasing ascent moves over deepening
subfreezing layers per the latest RAP and NAM forecast soundings,
chances for heavy snowfall will gradually increase. A band of
moderate snow is already in progress along the Nebraska/South Dakota
border, which is contributing to low/mid-level saturation.

The heavy snow will most likely develop across parts of eastern
Wyoming and northwestern Nebraska, before shifting north/east across
southern South Dakota and north-central Nebraska in the 06-09Z
timeframe as suggested by the latest high-resolution model guidance.
Latest forecast soundings suggest deep/saturated dendritic growth
zones colocated with strong ascent aided by the plume of warm air
advection. These factors, combined with a developing frontogenetic
circulation will support snowfall rates of 1-1.5 in/hr.

..Weinman/Squitieri.. 12/10/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!uJsrfFaIUuLyFyccCVH-XBeaMwRYj5UlbijqWAfWT71uLjd57oPybeUC_cUIqFRmz-ihY33h$=
for graphic product...

ATTN...WFO...FSD...LBF...UNR...CYS...

LAT...LON 41890447 42230446 42770444 43100412 43290334 43330163
43309973 43219902 42919907 42469902 42239928 42200009
42210073 42230157 42230266 42170318 42080343 41890368
41810398 41820429 41890447=20



------------=_1639108206-76136-5932
Content-Type: text/plain; charset="US-ASCII"
Content-Disposition: inline
Content-Transfer-Encoding: 7BIT

= = =
To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM. ------------=_1639108206-76136-5932--

--- SBBSecho 3.12-Linux
* Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (1:2320/105)