Areal Flood Advisory 13, NWS Riverton, WY

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Hazardous Weather Outlook
National Weather Service Riverton WY
258 PM MDT Fri Jul 30 2021

WYZ001>020-022>030-312100-
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-
258 PM MDT Fri Jul 30 2021

This Hazardous Weather Outlook is for Western and Central
Wyoming.

.DAY ONE...This Afternoon and Tonight.

Numerous thunderstorms are likely this afternoon and evening,
especially west of the Divide. Some thunderstorms may produce
locally heavy rainfall, and a Flash Flood Watch covers the area
with the highest potential to see localized flash flood.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Showers and thunderstorms are likely Saturday through Monday. The
main hazard will be locally heavy rainfall which could cause
localized flash flooding.

.SPOTTER INFORMATION STATEMENT...

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
227 PM MDT FRI JUL 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0220 PM     HEAVY RAIN       ATLANTIC CITY           42.50N 108.73W
07/30/2021  M0.51 INCH       FREMONT            WY   CO-OP OBSERVER

            ABOUT HALF AN INCH OF RAIN IN ROUGHLY 15
            MINUTES. NO FLOOD ISSUES SEEN. CELL MOVED
            THROUGH QUICKLY.

&&

LV

Special Weather Statement
National Weather Service Riverton WY
301 PM MDT Fri Jul 30 2021

WYZ019-302130-
Green Mountains and Rattlesnake Range-
301 PM MDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NATRONA COUNTY UNTIL
330 PM MDT...

At 300 PM MDT, Doppler radar was tracking a strong thunderstorm near
Split Rock, or 18 miles east of Jeffrey City, moving east at 10 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

This storm will remain over mainly rural areas of southwestern
Natrona County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4244 10746 4243 10753 4257 10754 4266 10724
      4243 10719
TIME...MOT...LOC 2100Z 259DEG 11KT 4250 10746

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Special Weather Statement
National Weather Service Riverton WY
332 PM MDT Fri Jul 30 2021

WYZ019-302200-
Green Mountains and Rattlesnake Range-
332 PM MDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN NATRONA COUNTY UNTIL
400 PM MDT...

At 330 PM MDT, Doppler radar was tracking a strong thunderstorm near
Devil's Gate, or 26 miles east of Jeffrey City, moving east at 20
mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Morman Handcart Visitor Center around 345 PM MDT.
  Independence Rock around 355 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4244 10740 4253 10740 4256 10706 4243 10705
TIME...MOT...LOC 2130Z 271DEG 18KT 4244 10730

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Special Weather Statement
National Weather Service Riverton WY
411 PM MDT Fri Jul 30 2021

WYZ020-302245-
Natrona County Lower Elevations-
411 PM MDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL NATRONA COUNTY UNTIL
445 PM MDT...

At 409 PM MDT, Doppler radar was tracking a strong thunderstorm over
Waltman Rest Area, or 42 miles east of Shoshoni. This storm was
nearly stationary.

Torrential Rainfall is occurring between Hiland and Waltman including
the Waltman Rest area. Also half inch hail and winds in excess of 30
mph will be possible with this storm.

Significant ponding of water is expected along Highway 26. Please
slow down to reduce the risk of hydroplaning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4303 10740 4317 10739 4313 10720 4302 10714
TIME...MOT...LOC 2209Z 270DEG 4KT 4308 10729

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Special Weather Statement
National Weather Service Riverton WY
442 PM MDT Fri Jul 30 2021

WYZ020-302315-
Natrona County Lower Elevations-
442 PM MDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL NATRONA COUNTY UNTIL 515
PM MDT...

At 440 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Powder River, or 34 miles northwest of Casper,
moving east at 10 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

This strong thunderstorm will be near...
  Goldeneye Reservoir around 515 PM MDT.
  Natrona around 525 PM MDT.

Other locations impacted by this storm include Natrona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4306 10701 4321 10695 4315 10664 4293 10671
TIME...MOT...LOC 2240Z 284DEG 9KT 4311 10689

21

Special Weather Statement
National Weather Service Riverton WY
456 PM MDT Fri Jul 30 2021

WYZ004-008-302330-
North Big Horn Basin-Bighorn Mountains West-
456 PM MDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BIG HORN COUNTY
UNTIL 530 PM MDT...

At 456 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Medicine Lodge Archaeological Site, or 17 miles
east of Basin, moving south at 5 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

This storm will remain over mainly rural areas of southeastern Big
Horn County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4446 10777 4441 10752 4427 10757 4431 10788
TIME...MOT...LOC 2256Z 019DEG 6KT 4437 10769

21