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February 2022 General Discussion


Spartman
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6 minutes ago, CheeselandSkies said:

Dont know if MKX has ever issued one of these before today.

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Milwaukee/Sullivan WI
646 PM CST Fri Feb 18 2022

WIC021-025-027-039-055-131-190145-
/O.NEW.KMKX.SQ.W.0004.220219T0046Z-220219T0145Z/
Fond du Lac WI-Columbia WI-Dane WI-Washington WI-Jefferson WI-
Dodge WI-
646 PM CST Fri Feb 18 2022

The National Weather Service in Milwaukee/Sullivan has issued a

* Snow Squall Warning for...
  Southeastern Fond du Lac County in east central Wisconsin...
  Southeastern Columbia County in south central Wisconsin...
  Northeastern Dane County in south central Wisconsin...
  Northern Washington County in southeastern Wisconsin...
  Northern Jefferson County in southeastern Wisconsin...
  Dodge County in southeastern Wisconsin...

* Until 745 PM CST.

* At 645 PM CST, a dangerous snow squall was located along a line
  extending from near Waupun to Waunakee, moving southeast at 45 mph.

  HAZARD...Poor visibility in heavy snow and blowing snow. Wind
           gusts greater than 40 mph.

  SOURCE...Radar and webcams.

  IMPACT...Dangerous life-threatening travel.

* This includes the following highways...
  Interstates 90 and 94.
  Interstate 41.

Locations impacted include...
Madison, West Bend, Sun Prairie, Watertown, Beaver Dam, Hartford,
Monona, Lake Mills, Mayville, Slinger, Columbus, Kewaskum, Marshall,
Horicon, Waterloo, Juneau, Cottage Grove, Johnson Creek, Deerfield
and Shorewood Hills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

Wet roadways will quickly freeze. Black ice will cause roads, bridges
and overpasses to become slick and dangerous. Slow down and be
prepared for sudden loss of traction.

&&

LAT...LON 4319 8851 4320 8853 4318 8854 4304 8873
      4307 8952 4357 8863 4356 8816 4354 8816
      4354 8804 4352 8804
TIME...MOT...LOC 0045Z 299DEG 40KT 4359 8864 4317 8948

$$

ANDERSON

this is the first set of Snow Squall Warnings MKX has issued

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41 minutes ago, hawkeye_wx said:

A nice snow squall would have been nice, but with a temp of 40º here it is falling as rain.  It'll probably finish as a bit of snow, but it shouldn't amount to much.

KCID and MPING reports seemingly suggest the band has transitioned nearly entirely to snow in the CR/IC corridor.

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Get ready Chicago peeps.

MD 153 graphic

Mesoscale Discussion 0153
   NWS Storm Prediction Center Norman OK
   0807 PM CST Fri Feb 18 2022

   Areas affected...portions of northeastern Iowa southern Wisconsin
   and northern Illinois

   Concerning...Snow Squall 

   Valid 190207Z - 190500Z

   SUMMARY...Snow squalls should continue this evening approaching
   Chicagoland. Low visibility from blowing and heavy snow may impact
   travel.

   DISCUSSION...Snow has expanded in coverage and intensity along a
   fast-moving arctic front moving across far eastern IA, southern WI
   and northwest IL. Snow squall conditions have been reported at
   numerous observing sites over the last 30 minutes as the band has
   expanded. Driven partly by the strong frontal circulation and steep
   low-level lapse rates advecting ahead of the front from southern NE,
   the shallow convection may persist for several more hours despite
   cooling surface temperatures and a stabilizing boundary layer
   downstream. Current projections place the line into the Chicagoland
   area between 0300 and 0430z.

   If the line is able to continue, strong wind fields associated with
   a strengthening surface cyclone over the Great Lakes will be
   exacerbated by strong vertical momentum transport from the shallow
   convection. Isolated gusts to 50 kts will be possible along with
   moderate to heavy snowfall as the line moves southeast. The latest
   HRRR suggests the line will begin to weaken as it outruns the plume
   of steeper lapse rates from NE and IA. While uncertainty remains,
   some risk for travel impacts appears possible through northern IL
   for a few more hours.

   ..Lyons/Guyer.. 02/19/2022
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