Severe Thunderstorm Warning 73, NWS Riverton, WY

Area Forecast Discussion
National Weather Service Riverton WY
243 PM MDT Tue Jul 23 2019

.SHORT TERM...(This evening through Wednesday)
Issued at 158 PM MDT Tue Jul 23 2019

Shower activity beginning to bubble up across the higher
elevations around west and central Wyoming this afternoon. With
the midlevel ridge to the south, showers will move to the
northeast off the Teton and Absaroka Ranges, and to the east from
the Big Horn Range. The strongest activity looks to be across far
NW WY, closer to the vort max passing to the northwest of the
state. The bottom edge of this vort cuts down the top of the ridge
tomorrow morning, keeping instability in the vicinity.
Temperatures into the 90s will help bubble up more thunderstorms
during the afternoon, with most areas having a threat for a
passing shower.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 158 PM MDT Tue Jul 23 2019

Ridging will begin to build back over the area on Thursday. Thus,
drier conditions will return through Friday afternoon. A shortwave
will bring moisture to the area by Friday night, however, and
coupled with a cold front, widespread showers and thunderstorms
are expected on Saturday. Sunday through early next week looks
drier again with the ridge to the south dominating the state. As
is the case this time of the year, isolated showers and
thunderstorms will still be possible over higher elevations.
Temperatures will remain warm through the period, and despite
Saturday's convection fuels will continue to dry out at many
locations. Fire weather conditions will be closely monitored.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 1138 AM MDT Tue Jul 23 2019

Widely scattered showers thunderstorms will develop over the area
after 19Z. This activity will continue through 06Z Wednesday. Some
storms will have wind gusts around 30 knots, brief heavy rain, and
small hail. VFR conditions are expected at the terminal sites.
However, MVFR conditions will occur in stronger storms due to
reduced visibility in rain. After 06Z Wed, west of the continental
divide, isolated showers are possible.

&&

.FIRE WEATHER...
Issued AT 158 PM MDT Tue Jul 23 2019

Shower and thunderstorm activity is starting to fire in NW WY this
afternoon, with most activity moving slowly. Most shower activity
will be finished by this evening, with mostly clear overnight.
Another round of showers and thunderstorms is expected tomorrow,
with slow motion of showers continuing. Temperatures will again
soar into the 90s for the lower elevations, with 70s across the
higher elevations. This will help humidity values down to 15 to 20
percent all areas during the afternoon. All areas can expect
northwest winds through the day, generally right around 10 mph.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...Straub
LONG TERM...Myers
AVIATION...Ross/LaVoie
FIRE WEATHER...Straub

Hazardous Weather Outlook
National Weather Service Riverton WY
118 AM MDT Tue Jul 23 2019

WYZ001>020-022>030-240730-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
118 AM MDT Tue Jul 23 2019

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated to scattered afternoon and thunderstorms, most in
northern Wyoming.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Wednesday...Isolated to widely scattered thunderstorms.

Friday...Isolated late afternoon and evening thunderstorms over
the far west.

Saturday...Isolated to widely scattered thunderstorms over central
and southern portions.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

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