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Gallatin County, MT
  Details for Gallatin County, MT Winter Storm Warning
Gallatin County, MT
  Details for Gallatin County, MT Hydrologic Outlook

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Information from NOAA Storm Prediction Center at this website

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SPC Day 1 Outlook

Updates are issued at 0600 UTC, 1300 UTC, 1630 UTC, 2000 UTC, 0100 UTC - Current UTC time: Dec 1 2022 1:14 pm

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Day 2

Categorical Day 1 Outlook

ACUS01 KWNS 011242
SPC AC 011240

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0640 AM CST Thu Dec 01 2022

Valid 011300Z - 021200Z


Severe thunderstorms are not expected today.

In mid/upper levels, the flow over the CONUS will become more zonal,
in the wake of a trough now over QC and eastern NY that will move
over Atlantic Canada by 00Z.  The main perturbation after that will
become a strong shortwave trough, now apparent in moisture-channel
imagery across southern BC then southwestward, offshore from the
Pacific Northwest and northwestern CA.  This trough should pivot
onshore through the day, the move inland and weaken overnight,
reaching western MT, ID, and northeastern NV by 12Z tomorrow. 
Accompanying cold midlevel conditions and steep low/middle-level
lapse rates, atop the Pacific marine layer, will support potential
for isolated, low-topped thunderstorms near parts of the Northwest

At the surface, the cold front related to the eastern mid/upper
trough was analyzed at 11Z across south FL, then west-southwestward
across the central Gulf.  This boundary should decelerate and become
more diffuse through the period.  Still, enough lift may remain on
the boundary, with rich moisture just to its south, to support
isolated thunder moving southwestward from the Gulf Stream across
the Straits of Florida, and adjoining parts of southeastern FL and
the Keys.  Modified 12Z EYW/MFL RAOBs show sufficiently deep MLCAPE
around 500-1000 J/kg, before the sampled air mass is displaced too
far south by frontal movement.

..Edwards/Mosier.. 12/01/2022


Day 3

Day 4

Largly based on original scripts from Ken True: and Rick Curly:

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