Storm Prediction Center Forecast


RSS Mesoscale Discussions from Storm Prediction Center

SPC - No watches are valid as of Thu Dec 12 01:52:01 UTC 2019

No watches are valid as of Thu Dec 12 01:52:01 UTC 2019.


SPC MD 2194

MD 2194 CONCERNING HEAVY SNOW FOR PORTIONS OF NORTHEAST NEW YORK STATE...VERMONT...WESTERN NEW HAMPSHIRE
MD 2194 Image


Mesoscale Discussion 2194
NWS Storm Prediction Center Norman OK
0750 PM CST Wed Dec 11 2019

Areas affected...Portions of northeast New York
State...Vermont...western New Hampshire

Concerning...Heavy snow 

Valid 120150Z - 120415Z

SUMMARY...Occasionally heavy snow, gusty winds, and brief
near-whiteout conditions may accompany more intense portions of
ongoing snow squalls over the next couple of hours.

DISCUSSION...KCXX dual-polarimetric data continues to indicate
ongoing snowfall associated with a squall across central Vermont,
with heavy snow recently reported at the Newport State Airport in
northern Vermont. While low-level lapse rates weaken with eastward
extent, latest RAP forecast soundings indicate low-level RH over
70%, with 0-2km westerly winds averaging within the 35-45 knot
range, which may support a couple more hours of snow squall
maintenance. Snowfall rates occasionally nearing 1.0 inch/hr, with
gusty winds and brief white-out conditions may accompany the
stronger squall segments.

..Squitieri/Guyer.. 12/12/2019

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

ATTN...WFO...GYX...BTV...ALY...

LAT...LON   45027388 45037249 45007155 44787131 44467137 43357177
            43017223 42797297 42877356 43287384 44307396 45027388 

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SPC Dec 12, 2019 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook
      
Day 1 Outlook Image
Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0626 PM CST Wed Dec 11 2019

Valid 120100Z - 121200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected tonight.

...South Florida...

Convergence along a slow-moving cold front will continue to promote
a few thunderstorms over a portion of south FL through about 03Z.
However, a stabilizing boundary layer will result in a gradual
diminishing trend.

...Western Washington State...

Destabilization and steepening lapse rates resulting from cooling
mid-level temperatures accompanying a low-amplitude shortwave trough
will spread through western WA later tonight, resulting in 100-300
J/kg MUCAPE. Scattered convection developing in this regime might
become capable of producing a few lightning flashes late in the
period.

...Northern New York...

Isolated lightning flashes will remain possible through 02Z in
association with a lake effect snow band downwind of Lake Ontario.
However, tendency will be for equilibrium levels to gradually fall
as heights and 700-800 mb temperatures rise in wake of a progressive
shortwave trough.

..Dial.. 12/12/2019

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