Riverton, WY

10:26 PM MDT on May 23, 2012 (GMT -0600)
Elev: 5410 ft
Lon: 108.4° W
Lat: 43.1° N
Source
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Active Advisory: Special Weather Statement (US Severe Weather)
Tropical Weather: Invest 94 (North Atlantic) Tropical Storm Bud (East Pacific) Typhoon Sanvu (Western Pacific)
Weather Summary
Jessica Parker
Weather Underground midday recap for Wednesday, May 23, 2012.

Unsettled weather formed across the Northwest and Upper Midwest on Wednesday as a trough of low pressure settled over the northwestern quadrant of the nation. Moisture streaming across the region continued to support areas of light to moderate rain showers from the Pacific Northwest through the Northern Rockies with chances of snow in the higher elevations of the Northern Rockies. Meanwhile, a cold front from the West moved across the Upper Midwest, Central Plains, and Central High Plains this afternoon and brought rain and thunderstorms to areas of Minnesota and the Dakotas. The Storm Prediction Center issued a slight risk of severe weather development statement for areas from the Upper Midwest and Central Plains into northeastern Colorado through the afternoon and evening. While the main concerns with these storms were damaging wind gusts and very large hail, a couple of isolated tornadoes were also possible.

In the Southwest, fire weather danger remained high across the Southwest as above normal temperatures, single digit relative humidity levels, and windy weather conditions persisted in many areas.

In the East, a few showers continued across the Northeast and the Mid-Atlantic during the afternoon as a frontal system lingered across the Eastern Seaboard. Meanwhile, heavy rain and strong thunderstorms with gusty winds persisted across the southern tip of Florida. Saturated grounds from the heavy rainfall that occurred yesterday combined with today\'s rainfall resulted in Flood Watches in Miami-Dade County. Additional rainfall accumulations were expected to range from 1 to 2 inches through tonight with locally higher amounts possible in more concentrated bands of rain.
Weather Underground midday recap for Wednesday, May 23, 2012.

Unsettled weather formed across the Northwest and Upper Midwest on Wednesday as a trough of low pressure settled over the northwestern quadrant of the nation. Moisture streaming across the region continued to support areas of light to moderate rain showers from the Pacific Northwest through the Northern Rockies with chances of snow in the higher elevations of the Northern Rockies. Meanwhile, a cold front from the West moved across the Upper Midwest, Central Plains, and Central High Plains this afternoon and brought rain and thunderstorms to areas of Minnesota and the Dakotas. The Storm Prediction Center issued a slight risk of severe weather development statement for areas from the Upper Midwest and Central Plains into northeastern Colorado through the afternoon and evening. While the main concerns with these storms were damaging wind gusts and very large hail, a couple of isolated tornadoes were also possible.

In the Southwest, fire weather danger remained high across the Southwest as above normal temperatures, single digit relative humidity levels, and windy weather conditions persisted in many areas.

In the East, a few showers continued across the Northeast and the Mid-Atlantic during the afternoon as a frontal system lingered across the Eastern Seaboard. Meanwhile, heavy rain and strong thunderstorms with gusty winds persisted across the southern tip of Florida. Saturated grounds from the heavy rainfall that occurred yesterday combined with today\'s rainfall resulted in Flood Watches in Miami-Dade County. Additional rainfall accumulations were expected to range from 1 to 2 inches through tonight with locally higher amounts possible in more concentrated bands of rain.
Weather Underground Broadcast Network

Riverton Weather at a Glance

Updated 10:08 PM MDT
Weather Station - report
Riverton
Elevation
5405 ft
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Now
Overcast
Overcast
Temperature
43.4 °F
Feels Like 39 °F
Wind(mph)
7.0
Sunrise / Set
5:42 AM
8:39 PM
Moon
Waxing Crescent
Tonight
Rain Showers 39 °F
Rain Showers
20% chance of precipitation
Tomorrow
Thunderstorm 57 °F
T-storms
30% chance of precipitation
Tomorrow Night
Thunderstorm 37 °F
T-storms
30% chance of precipitation
Friday
Thunderstorm 59 | 39 °F
T-storms
70% chance of precipitation
Saturday
Thunderstorm 63 | 41 °F
T-storms
20% chance of precipitation
Sunday
Partly Cloudy 63 | 41 °F
Partly Cloudy
Tomorrow is forecast to be Much Cooler than today.
Conditions
Pressure
29.64 in
Visibility
10.0 miles
Clouds
Overcast 8500 ft
Moisture
Humidity
69%
Rainfall
0.00 in
Snow Depth
Not available.
METAR
METAR KRIW 240353Z AUTO 07010KT 10SM OVC085 07/01 A2974 RMK AO2 SLP036 T00670006
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Weather Radio
Weather Radio Index
Temperature
Windchill
39 °F
Dew Point
34 °F
Wind
Speed / Dir
7.0 mph from NE
Wind Gust
Health
UV
0.0 out of 16
Pollen
5.70 out of 12
Pollen Forecast
Air Quality
Not available.
Flu Activity
Sporadic
View Flu Map
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Source: BestForecast
Descriptive Forecast
Wednesday Night
nt_rain Overcast with rain showers in the evening, then partly cloudy with rain showers. Low of 39F. Breezy. Winds from the North at 10 to 20 mph. Chance of rain 20%.
Thursday
tstorms Partly cloudy with rain showers in the morning, then mostly cloudy with thunderstorms and a chance of rain. High of 57F. Winds from the North at 5 to 15 mph. Chance of rain 30%.
Thursday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain, then a chance of rain after midnight. Low of 37F. Winds from the North at 5 to 15 mph. Chance of rain 30%.
Friday
tstorms Overcast with rain showers, then thunderstorms and rain showers in the afternoon. High of 59F. Winds from the NNE at 10 to 15 mph. Chance of rain 70%.
Friday Night
nt_tstorms Overcast with thunderstorms and a chance of rain, then a chance of rain after midnight. Low of 39F. Winds from the NNE at 5 to 15 mph shifting to the South after midnight. Chance of rain 50% with rainfall amounts near 0.3 in. possible.
Saturday
tstorms Mostly cloudy in the morning, then overcast with thunderstorms and a chance of rain. High of 63F. Winds from the East at 5 to 10 mph. Chance of rain 20%.
Saturday Night
nt_partlycloudy Partly cloudy with thunderstorms and a chance of rain. Low of 41F. Breezy. Winds from the SW at 10 to 20 mph.
Sunday
partlycloudy Partly cloudy. High of 63F. Breezy. Winds from the WSW at 15 to 20 mph.
Sunday Night
nt_partlycloudy Partly cloudy. Low of 41F. Winds from the West at 5 to 20 mph.
Monday
clear Clear. High of 72F. Winds from the WSW at 5 to 10 mph.
Monday Night
nt_clear Clear. Low of 48F. Winds from the NW at 5 to 15 mph shifting to the WSW after midnight.
Tuesday
clear Clear. High of 75F. Winds from the SW at 5 to 15 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the West at 5 to 20 mph.
Wednesday
partlycloudy Partly cloudy. High of 73F. Winds from the NW at 5 to 10 mph shifting to the NE in the afternoon.
Wednesday Night
nt_partlycloudy Partly cloudy. Low of 46F. Winds from the NNE at 5 to 15 mph shifting to the East after midnight.
Thursday
partlycloudy Partly cloudy. High of 75F. Winds less than 5 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds less than 5 mph.
Friday
partlycloudy Partly cloudy. High of 77F. Winds less than 5 mph.
Friday Night
nt_partlycloudy Partly cloudy. Low of 50F. Winds less than 5 mph.
Saturday
clear Clear. High of 79F. Winds less than 5 mph.
Saturday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm. Low of 52F. Winds less than 5 mph. Chance of rain 20%.
Sunday
clear Clear. High of 70F. Winds from the WSW at 5 to 10 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds less than 5 mph.
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Forecast

View Calendar 10-Day Forecast for station KRIW

Thursday, 24
Thunderstorm
57 | 37 °F
T-storms
Chance of
Precipitation
30%
Friday, 25
Thunderstorm
59 | 39 °F
T-storms
Chance of
Precipitation
70%
Saturday, 26
Thunderstorm
63 | 41 °F
T-storms
Chance of
Precipitation
20%
Sunday, 27
Partly Cloudy
63 | 41 °F
Partly Cloudy
Chance of
Precipitation
0%
Monday, 28
Clear
72 | 48 °F
Clear
Chance of
Precipitation
0%
Tuesday, 29
Clear
75 | 48 °F
Clear
Chance of
Precipitation
0%
Wednesday, 30
Partly Cloudy
73 | 46 °F
Partly Cloudy
Chance of
Precipitation
0%
Thursday, 31
Partly Cloudy
75 | 48 °F
Partly Cloudy
Chance of
Precipitation
0%
Friday, 1
Partly Cloudy
77 | 50 °F
Partly Cloudy
Chance of
Precipitation
0%
Saturday, 2
Clear
79 | 52 °F
Clear
Chance of
Precipitation
0%
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Thursday
tstorms Partly cloudy with rain showers in the morning, then mostly cloudy with thunderstorms and a chance of rain. High of 57F. Winds from the North at 5 to 15 mph. Chance of rain 30%.
Thursday Night
nt_tstorms Partly cloudy with thunderstorms and a chance of rain, then a chance of rain after midnight. Low of 37F. Winds from the North at 5 to 15 mph. Chance of rain 30%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 41 | 32 48 | 34 54 | 25 43 | 32
Wind 8 mph North 5 mph NE 11 mph North 6 mph North
Humidity 70% 57% 33% 64%
Chance of Precip. 20% 30% 30% 30%
Cloud Cover 58% 76% 18% 68%
Conditions Rain Showers Thunderstorm Thunderstorm Chance of Rain
Sunrise & Sunset
5:42 AM
8:39 PM
The quality of the forecasted high temperature for this day is excellent. MaxT RMSE [1.33], Average RMSE [1.37]
The National Weather Service forecast quality is excellent. MaxT RMSE [1.34], Average RMSE [2.76] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Friday
tstorms Overcast with rain showers, then thunderstorms and rain showers in the afternoon. High of 59F. Winds from the NNE at 10 to 15 mph. Chance of rain 70%.
Friday Night
nt_tstorms Overcast with thunderstorms and a chance of rain, then a chance of rain after midnight. Low of 39F. Winds from the NNE at 5 to 15 mph shifting to the South after midnight. Chance of rain 50% with rainfall amounts near 0.3 in. possible.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 39 | 30 54 | 36 59 | 48 46 | 39
Wind 8 mph NNE 9 mph NE 12 mph NNE 9 mph South
Humidity 67% 49% 69% 78%
Chance of Precip. 30% 60% 70% 50%
Cloud Cover 91% 90% 77% 71%
Conditions Rain Showers Thunderstorm Thunderstorm Chance of Rain
Sunrise & Sunset
5:41 AM
8:40 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [1.52], Average RMSE [2.49]
The National Weather Service forecast quality is excellent. MaxT RMSE [1.29], Average RMSE [2.47] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Saturday
tstorms Mostly cloudy in the morning, then overcast with thunderstorms and a chance of rain. High of 63F. Winds from the East at 5 to 10 mph. Chance of rain 20%.
Saturday Night
nt_partlycloudy Partly cloudy with thunderstorms and a chance of rain. Low of 41F. Breezy. Winds from the SW at 10 to 20 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 39 | 36 63 | 28 54 | 34 45 | 19
Wind 5 mph ENE 7 mph ESE 14 mph SW 8 mph WSW
Humidity 89% 25% 45% 37%
Chance of Precip. 10% 30% 20% 0%
Cloud Cover 83% 90% 60% 15%
Conditions Mostly Cloudy Thunderstorm Thunderstorm Clear
Sunrise & Sunset
5:40 AM
8:41 PM
The quality of the forecasted high temperature for this day is good. MaxT RMSE [2.07], Average RMSE [2.95]
The National Weather Service forecast quality is good. MaxT RMSE [2.03], Average RMSE [4.07] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Sunday
partlycloudy Partly cloudy. High of 63F. Breezy. Winds from the WSW at 15 to 20 mph.
Sunday Night
nt_partlycloudy Partly cloudy. Low of 41F. Winds from the West at 5 to 20 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 41 | 28 57 | 25 52 | 16 48 | 27
Wind 12 mph SW 15 mph WSW 17 mph West 7 mph West
Humidity 59% 29% 25% 43%
Chance of Precip. 0% 10% 10% 10%
Cloud Cover 49% 56% 38% 44%
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:40 AM
8:41 PM
The quality of the forecasted high temperature for this day is fair. MaxT RMSE [3.27], Average RMSE [3.18]
The National Weather Service forecast quality is fair. MaxT RMSE [2.61], Average RMSE [4.75] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Monday
clear Clear. High of 72F. Winds from the WSW at 5 to 10 mph.
Monday Night
nt_clear Clear. Low of 48F. Winds from the NW at 5 to 15 mph shifting to the WSW after midnight.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 43 | 30 59 | 25 68 | 21 55 | 30
Wind 7 mph SW 5 mph West 10 mph WNW 3 mph WNW
Humidity 59% 25% 16% 37%
Chance of Precip. 0% 0% 0% 0%
Cloud Cover 1% 0% 7% 6%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:39 AM
8:42 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [3.67], Average RMSE [3.87]
The National Weather Service forecast quality is fair. MaxT RMSE [3.34], Average RMSE [5.27] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Tuesday
clear Clear. High of 75F. Winds from the SW at 5 to 15 mph.
Tuesday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds from the West at 5 to 20 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 48 | 32 68 | 30 73 | 21 55 | 30
Wind 4 mph SSW 9 mph SW 15 mph WNW 7 mph WSW
Humidity 55% 22% 13% 35%
Chance of Precip. 0% 0% 10% 0%
Cloud Cover 3% 1% 12% 20%
Conditions Clear Clear Clear Clear
Sunrise & Sunset
5:39 AM
8:42 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.43], Average RMSE [4.29]
The National Weather Service forecast quality is poor. MaxT RMSE [4.01], Average RMSE [5.15] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Wednesday
partlycloudy Partly cloudy. High of 73F. Winds from the NW at 5 to 10 mph shifting to the NE in the afternoon.
Wednesday Night
nt_partlycloudy Partly cloudy. Low of 46F. Winds from the NNE at 5 to 15 mph shifting to the East after midnight.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 48 | 36 64 | 34 68 | 32 55 | 34
Wind 8 mph West 10 mph NE 9 mph NNE 8 mph East
Humidity 61% 30% 25% 44%
Chance of Precip. 0% 0% 0% 10%
Cloud Cover 53% 9% 36% 72%
Conditions Partly Cloudy Clear Partly Cloudy Mostly Cloudy
Sunrise & Sunset
5:39 AM
8:42 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [4.37], Average RMSE [5.34]
The National Weather Service forecast quality is poor. MaxT RMSE [4.20], Average RMSE [5.67] : Use NWS
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Thursday
partlycloudy Partly cloudy. High of 75F. Winds less than 5 mph.
Thursday Night
nt_partlycloudy Partly cloudy. Low of 48F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 48 | 36 64 | 43 70 | 41 54 | 36
Wind 4 mph SSE 4 mph NW 6 mph NNW 3 mph NNE
Humidity 60% 43% 34% 51%
Chance of Precip. 0% 10% 10% 10%
Cloud Cover 29% 35% 47% 65%
Conditions Partly Cloudy Partly Cloudy Partly Cloudy Mostly Cloudy
Sunrise & Sunset
5:39 AM
8:42 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.45], Average RMSE [5.62]
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Friday
partlycloudy Partly cloudy. High of 77F. Winds less than 5 mph.
Friday Night
nt_partlycloudy Partly cloudy. Low of 50F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 48 | 39 64 | 46 70 | 36 55 | 36
Wind 2 mph WNW 3 mph WSW 3 mph NW 1 mph NE
Humidity 71% 50% 29% 44%
Chance of Precip. 10% 10% 10% 0%
Cloud Cover 65% 55% 45% 29%
Conditions Mostly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Sunrise & Sunset
5:39 AM
8:42 PM
The quality of the forecasted high temperature for this day is poor. MaxT RMSE [6.39], Average RMSE [6.03]
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Saturday
clear Clear. High of 79F. Winds less than 5 mph.
Saturday Night
nt_chancetstorms Partly cloudy with a chance of a thunderstorm. Low of 52F. Winds less than 5 mph. Chance of rain 20%.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 50 | 37 68 | 43 72 | 28 57 | 32
Wind 2 mph SW 5 mph SW 5 mph West 2 mph NW
Humidity 59% 39% 19% 36%
Chance of Precip. 0% 10% 10% 20%
Cloud Cover 13% 8% 3% 18%
Conditions Clear Clear Clear Chance of a Thunderstorm
Sunrise & Sunset
5:39 AM
8:42 PM
Source: BestForecast at 7:54 PM MDT on May 23, 2012
Descriptive Forecast
Sunday
clear Clear. High of 70F. Winds from the WSW at 5 to 10 mph.
Sunday Night
nt_clear Clear. Low of 52F. Winds less than 5 mph.
Hourly Forecast 6AM 12 Noon 6PM 12 Midnight
Temp. | Dew Point 52 | 36 68 | 45 70 | 39 57 | 39
Wind 3 mph WSW 7 mph WSW 8 mph West 2 mph NW
Humidity 53% 42% 31% 50%
Chance of Precip. 20% 10% 0% 0%
Cloud Cover 32% % % %
Conditions Chance of a Thunderstorm Clear Clear Clear
Sunrise & Sunset
5:39 AM
8:42 PM
Scientific Forecaster Discussion — MOS Weather Graph
Nearby
History & Almanac
May 24, 2012 Max Temp Min Temp
Normal (KRIW) - -
Record (KRIW) 84 °F (2003) 28 °F (2002)
Yesterday 78 °F 51 °F
Choose a date
Earthquake Activity
City Distance Mag. Time & Date
No recent earthquake activity has been reported nearby.
Minimum magnitude displayed is 2.5.
More information at USGS.gov
Astronomy
May. 23, 2012 Rise Set
Actual Time 5:42 AM MDT 8:39 PM MDT
Civil Twilight 5:08 AM MDT 9:12 PM MDT
Nautical Twilight 4:25 AM MDT 9:56 PM MDT
Astronomical Twilight 3:35 AM MDT 10:46 PM MDT
Moon 7:47 AM MDT (5/23) 11:02 PM MDT (5/23)
Length Of Visible Light 16h 04m
Length of Day
14h 56m
Tomorrow will be 1m 43s longer.
Waxing Crescent, 9% of the Moon is Illuminated
Today
Waxing Crescent
May 28
First Quarter
Jun 4
Full
Jun 11
Last Quarter
Jun 19
New
Visit Astronomy
Yesterday's Extremes
State Highs State Lows
72 °F
Torrington
67 °F
Douglas
66 °F
Lander
64 °F
Casper
64 °F
Greybull
30 °F
Yellowstone
32 °F
Pinedale
32 °F
Thermopolis
33 °F
South Pass
33 °F
Big Piney
Record Extremes
Snow Depth
Station Depth Elevation
Townsend Creek 0 in 8700 ft
Big Sandy Opening 0 in 9080 ft
Gunsight Pass 5 in 9820 ft
New Fork Lake 0 in 8340 ft
Kendall R.S. 0 in 7740 ft
Snow Depth Reports — Snow Depth Map
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Nearby Events
Event Date Forecast
No events within 10 mi of location. View all events.
Event data courtesy eviesays.com
Aviation
City Temp. Conditions Updated
Riverton 44 °F Overcast 9:53 PM MDT
Thermopolis 32 °F Mostly Cloudy 10:35 PM MDT
Lander 45 °F Mostly Cloudy 9:53 PM MDT
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Flight To ETA Status
No flights were found.
Flight Tracker by FlightAware FlightAware
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Type Condition
Flight Rule: VFR (KRIW)
Wind Speed: 10.0 kts.
Wind Dir: 55° (NE)
Ceiling: 8500 ft

METAR KRIW 240353Z AUTO 07010KT 10SM OVC085 07/01 A2974 RMK AO2 SLP036 T00670006

View all Reports & Maps
Sports
Event Date Forecast
Tigers vs. Indians 7:05 PM EDT on May 23, 2012 Clear, 67 °F
Royals vs. Yankees 7:05 PM EDT on May 23, 2012 Chance of a Thunderstorm, 68 °F
Event Date Forecast
Chivas USA vs. New York 7:00 PM EDT on May 23, 2012 Chance of a Thunderstorm, 70 °F
FC Dallas vs. Chicago 1:30 AM BST on May 24, 2012 Clear, High 73° F/ 23° C
Event Date Forecast
Coca-Cola 600 6:16 PM EDT on May 27, 2012 Partly Cloudy, 81 °F
FedEx 400 benefiting Autism Speaks 1:15 PM EDT on June 03, 2012 Average High 79° F/ 26° C
Event Date Forecast
Crowne Plaza Invitational at Colonial 8:30 AM CDT on May 24, 2012 Mostly Cloudy, 72 °F
Crowne Plaza Invitational at Colonial 8:30 AM CDT on May 25, 2012 Mostly Cloudy, 72 °F
View all Sports Weather
Weather Stations
Station Location Temp. Windchill Dew Point Humidity Wind Precipitation Elevation Updated Type Website
Riverton, WY 43.4 °F 39 °F 34 °F 69% NE  at  7.0 mph - / hr 5405 ft 10:08 PM MDT Normal  
APRSWXNET Riverton WY , Riverton, WY 43 °F 36 °F 34 °F 71% ENE  at  15 mph 0.00 in / hr 5406 ft 9:49 PM MDT MADIS
Shoshoni, WY 46.3 °F 45 °F 36 °F 66% SSE  at  4.0 mph 0.00 in / hr 5025 ft 10:20 PM MDT Normal  
HADS LITTLE WIND RIVER NEAR RIVERTON WY, Saint Stephens, WY 47 °F 47 °F - - North  at  - 0.00 in / hr 4900 ft 9:15 PM MDT MADIS
HADS BOYSEN WEATHER STATION NEAR SHOS WY, Shoshoni, WY 46 °F 39 °F - - NNE  at  19 mph 0.00 in / hr 4709 ft 9:30 PM MDT MADIS
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Special Weather Statement
Mobile & Email Alerts Statement as of 3:25 PM MDT on May 23, 2012

... A major change to colder and unsettled weather through Sunday...

A much cooler air mass will work into the area tonight into much of
Friday. A major storm system may take shape Friday through Saturday
as a large low pressure system strengthens over the Great Basin
leading to the possibility of valley rain and mountain snowfall.

It will remain cool and unsettled in the northern mountains today
and Thursday with periods of light rain at the lowest elevations with
some occasional light snow in the mountains. Expect a cool
day east of The Divide on Thursday with a scattering of showers and
isolated afternoon thunderstorms across most of the area.

By Friday... the potential for a significant storm system may start
to affect areas east of The Divide. Areas of rain may
develop over the northern and central basins with wet snow in the
nearby foothills and mountains... especially from midday on. Some
light to locally moderate snow will continue in Yellowstone National
Park... the absarokas and bighorns. Some heavier snow is possible in
the northwest mountains Friday night and Saturday... especially The
Tetons northward into western Yellowstone Park in areas above 8000 to
8500 feet.

The storm system is then expected to gradually lift northward into
Montana Saturday night and Sunday. Cold Valley rain and mountain
snow will continue across the northern mountains... including
Yellowstone National Park through Saturday. Temperatures will start
to recover on Sunday in the northern mountains but it will still
remain quite unsettled in Yellowstone National Park on Sunday with
light valley rain and higher elevation snow showers.

Memorial Day looks much drier with more seasonable temperatures.

Travellers and those with outdoor plans should monitor the latest
forecasts from the National Weather Service on this expected major
change to colder and unsettled weather. Significant snowfall may
accumulate in the central and northern mountains during this
timeframe. The latest forecast can be found at
www.Weather.Gov/Riverton.