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Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

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SYNOPSIS:

Saturday & Saturday evening:  A stronger, but warmer system is expected to impact the Cowboy State. The bulk of the precipitation is expected to impact the western and southern portions of the area. Significant mountain snow/valley rain could occur over the west and southwest with this system with rain expected up to 9000 feet.  A few thunderstorms are possible Saturday afternoon and evening which could produce heavy downpours. The rainfall in the western valleys on a melting snowpack, and some frozen ground could cause localized flooding across the western valleys Saturday.  Although the heaviest of the precipitation will end Saturday night, the localized flooding threat could continue over the far west into the day Sunday.

IMPACTS:

  • Localized flooding possible across the western Valleys Saturday & Sunday


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Quick View of Hazards and Forecast Precipitation Totals (created at 6 AM on 4/7)
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Click Image To Enlarge
â–º Flood Advisory for the Jackson Hole Valley
until 1145 AM Sunday

â–º Flood Watch for the Star Valley
from Noon Saturday through Sunday Afternoon

Click Image To Enlarge
Expected Precipitation
Saturday & Saturday Night
(Mainly Rainfall below 9000 feet)

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Snow Totals and Wind Reports will be posted and updated here once the storm occurs
(Please double check date and time of product)

                        
073
NOUS45 KRIW 080029
PNSRIW
WYZ001>020-022>030-081228-

Public Information Statement
National Weather Service Riverton WY
528 PM MST Sun Dec 7 2025

...SNOWFALL REPORTS...

Location                     Amount     Elevation (ft.)

...Wyoming...

...Big Horn County...
14 NE Shell                  15.0 in    9343
19 N Shell                   14.0 in    9384
17 E Shell                   11.0 in    9577

...Fremont County...
23 NW Dubois                 17.0 in    9347
11 N Dubois                  11.0 in    8666
16 NE Dubois                 8.0 in     8423
6 WSW Dubois                 7.0 in     9411
11 WSW Burris                6.0 in     9903
1 WNW Dubois                 5.0 in     6955

...Johnson County...
18 WNW Buffalo               6.0 in     9857
27 WNW Buffalo               5.0 in     8539

...Lincoln County...
15 ESE Smoot                 20.0 in    9037
3 SE Turnerville             18.0 in    8237
10 ESE Smoot                 18.0 in    9378
21 NE Cokeville              15.0 in    9322
15 ENE Cokeville             14.0 in    7903
5 SSE Smoot                  14.0 in    6980
16 ENE Turnerville           13.0 in    8783
6 ENE Smoot                  13.0 in    8398
16 ENE Turnerville           13.0 in    9022
15 NNE Cokeville             12.0 in    8355
10 ENE Turnerville           12.0 in    6642
4 NE Thayne                  11.3 in    6199
3 N Etna                     10.5 in    5927
8 S Smoot                    10.0 in    7593
1 SE Thayne                  10.0 in    6071
2 NE Alpine                  10.0 in    5698
4 NNE Thayne                 9.8 in     6248
2 S Bedford                  7.4 in     6296
Afton                        6.5 in     6255

...Park County...
13 WSW Sunlight Basin        15.0 in    9378
2 WSW East Entrance          14.0 in    7354
14 N Sunlight Basin          12.0 in    9357
12 SE Pahaska                11.0 in    9650
16 N Pahaska                 10.0 in    9326
19 SW Valley                 10.0 in    8491
7 NW Sunlight Basin          10.0 in    8017
8 W East Entrance            8.0 in     8411
1 SW Canyon                  7.0 in     7865
20 SW Pitchfork              7.0 in     9789

...Sublette County...
17 ESE Turnerville           17.0 in    8764
20 NW Calpet                 11.0 in    8062
20 E Bondurant               10.0 in    7683
11 NNE Pinedale              10.0 in    9010
14 E Bondurant               10.0 in    8206
20 E Bondurant               10.0 in    7741
12 N Cora                    10.0 in    8413
6 WNW Cora                   9.8 in     7460
12 ESE Bondurant             8.0 in     7960
11 E Big Sandy               8.0 in     9062
16 SW Dubois                 8.0 in     9716
2 WSW Pinedale               5.9 in     7301
1 NNW Pinedale               4.7 in     7204

...Teton County...
4 WNW Teton Village          22.0 in    9628
3 NW Teton Village           21.0 in    9663
6 ENE Alta                   20.0 in    9260
3 NW Teton Village           19.0 in    8220
23 ESE Moran Junction        18.0 in    9612
5 ENE Alta                   18.0 in    8792
6 NNW Moose                  18.0 in    9561
5 N South Entrance           16.0 in    7875
2 NW Wilson                  15.0 in    8017
South Entrance               14.0 in    7004
22 E South Entrance          14.0 in    9332
16 E Moran Junction          13.0 in    9188
8 NNE Moran Junction         12.0 in    7671
10 N Bondurant               12.0 in    6912
5 W Wilson                   11.5 in    8047
2 SSW Teton Village          11.3 in    6217
2 NNE Teton Village          9.8 in     6338
2 NW Teton Village           9.0 in     6596
1 NNE Jackson                7.2 in     6226
1 S Jackson                  7.0 in     7804
Jackson                      5.7 in     6256
2 SSW Grant Village          4.0 in     7968
6 ESE Hoback Junction        3.0 in     6150

...Washakie County...
18 ENE Ten Sleep             14.0 in    9449

Observations are collected from a variety of sources with varying
equipment and exposures. We thank all volunteer weather observers
for their dedication. Not all data listed are considered official.

$$



                

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