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ACUS44 KWBC 041459

SCCNS4



Storm Summary Number 01 for Northern High Plains to Upper Midwest

Blizzard

NWS Weather Prediction Center College Park MD

1000 AM CDT Tue Apr 04 2023



...Heavy snow continues, with blizzard conditions to begin across

portions of the Northern High Plains today...



Blizzard Warnings are in effect for portions of southern and

eastern Wyoming, northwestern Nebraska, the Dakotas, and western

Minnesota.



Winter Storm Warnings are in effect for portions of southeastern

Wyoming, western South Dakota, and northern Minnesota.



Winter Weather Advisories are in effect for portions of northern

Nebraska, southeastern South Dakota, western/central Minnesota,

and portions of the Upper Midwest.



Ice Storm Warnings are in effect for portions of northern

Wisconsin and Michigan's Upper Peninsula.



For a detailed graphical depiction of the latest watches, warnings

and advisories, please see www.weather.gov



At 900 AM CDT...A strong surface-based low pressure system was

analyzed just lee of the Rocky Mountains in central Colorado, with

a minimum pressure of 985 mb (29.09 in Hg). A strong

stationary/warm front extended east of the low into the lower

Midwest, while a cold front extended south-southwestward into New

Mexico. A stark contrast of temperatures was observed, with

temperatures north of the stationary boundary across the Central

Plains ranging from the upper 40s to the teens from south to

north, with temperatures south of the boundary generally in the

70s and 80s. NWS Radar and surface observations show a large

region of moderate to heavy snow falling in a band stretching from

southwestern South Dakota into portions of central Minnesota, with

maximum sustained winds of 10-20 kts.



...Selected preliminary Storm Total Snowfall in inches from 700 AM

CDT Mon Apr 03 through 900 AM CDT Tue Apr 04...



...SOUTH DAKOTA...

HOT SPRINGS                          24.0                    

CUSTER 5 ENE                         21.5                    

FOLSOM 7 WSW                         15.0                    

HERMOSA 6 W                          14.2                    

HISEGA 3 NE                          13.0                    

EDGEMONT                             11.0                    

DWTN RAPID CITY 3 S                   9.5                    



...WYOMING...

MANVILLE                             20.0                    

DOUGLAS                              17.0                    

WHEATLAND                            12.0                    

LARAMIE 22 NE                         8.5                    





The low pressure system will maintain its intensity as it begins

propagating toward the east-northeast into the Central High Plains

today. Precipitation is expected to intensify and increase in

coverage this morning as southerly flow aloft brings in air with

high moisture content over the region. Snowfall will be rapidly

accumulating, with rates of up to 2"/hr possible over some areas

of the Dakotas and northwestern Minnesota. Additionally, a

tightening pressure gradient will result in increasing winds

across the Northern High Plains, which may create blizzard

conditions across much of the region. 12-18" (locally 2+ feet) of

snowfall is expected across a wide region encompassing most of the

Dakotas and portions of northwestern Minnesota. A gradual warming

trend across the entire region will result in some changeover of

precipitation from snow to freezing rain/sleet to rain, especially

in eastern South Dakota, north-central Minnesota, and the

Upper-Midwest. Significant icing is possible in a region

stretching from southeastern South Dakota into portions of the

Upper-Midwest, with highest probabilities of 0.1"+ of ice over

northern Wisconsin and Michigan's Upper Peninsula. The storm will

track toward the northeast and pass through the Upper Midwest

before entering Canada on Thursday afternoon. While the storm

system is centered over central-southern Canada, there is

increasing confidence of significant freezing rain impacts from

this system spreading into portions of New England, especially in

New Hampshire and Maine on Wednesday night into Thursday. Travel

conditions during the event will be treacherous, given the high

winds, heavy snow, and potential for significant icing. High winds

following the event will still create dangerous travel conditions

due to significant blowing snow, which can create create very low

visibility almost instantaneously.



The next Storm Summary will be issued by the Weather Prediction

Center at 1000 PM CDT. Please refer to your local National Weather

Service office for additional information on this event.



Genz

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