Alert archive / Wyoming / Special Weather Statements in 2021
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Jul 29, 2021, 4:28 PM MDT for Teton County, Wyoming. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2021, 4:28 PM MDT (22:28 UTC)
- Expired
- Jul 29, 2021, 5:15 PM MDT
- In force
- 47 min
- Issued by
- NWS Riverton, WY
County Teton County, WY
The radar
The Pocatello radar (KSFX), 206 km from the middle of the area, began a volume at 22:30 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 10.5 hours before the alert went out and 343 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- -227 J/kg
- Mixed-layer LCL
- 2197 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Jul 29, 3:57 PM MDT, 31 minutes earlier.
Area forecast discussion, Jul 29, 3:57 PM MDT, 31 minutes before
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</html>Hazardous weather outlook, Jul 29, 3:24 AM MDT, 13 hours 4 minutes before
Hazardous Weather Outlook National Weather Service Riverton WY 324 AM MDT Thu Jul 29 2021 WYZ001>020-022>030-300930- 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- 324 AM MDT Thu Jul 29 2021 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Scattered showers and thunderstorms into tonight. The main threat will be heavy rain that could cause some flash flooding. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Friday through Monday...Showers and thunderstorms likely each day. The main hazard will be locally very heavy rainfall which could cause some flash flooding. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
In the hours before
Special weather statement, Jul 29, 3:17 PM MDT, 1 hour 11 minutes before
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</html>Special weather statement, Jul 29, 3:48 PM MDT, 40 minutes before
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</html>Special weather statement, Jul 29, 4:09 PM MDT, 19 minutes before
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</html>Special weather statement, Jul 29, 4:28 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Riverton WY 428 PM MDT Thu Jul 29 2021 WYZ001-292315- Yellowstone National Park- 428 PM MDT Thu Jul 29 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN TETON COUNTY UNTIL 515 PM MDT... At 426 PM MDT, Doppler radar was tracking thunderstorms impacting areas between Old Faithful and Grant Village, moving east at 5 to 10 mph. The main hazard will be torrential rainfall in a short time as well as dangerous cloud to ground lightning. Significant ponding of water could occur on area roadways. Please slow down. 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 4430 11102 4448 11099 4448 11052 4434 11055 TIME...MOT...LOC 2226Z 253DEG 10KT 4439 11089 21
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 3:17 PM MDT | Special Weather Statement | RIW | 28 min | |
| Jul 29, 4:09 PM MDT | Special Weather Statement | RIW | Teton | 21 min |
| Jul 29, 4:36 PM MDT | Special Weather Statement | RIW | 24 min | |
| Jul 29, 4:58 PM MDT | Special Weather Statement | RIW | Natrona | 32 min |
| Jul 29, 5:47 PM MDT | Special Weather Statement | RIW | Teton | 43 min |
Nearby
Special Weather Statements in Wyoming, 2021Every special weather statement in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.