Alert archive / Wyoming / Flash Flood Warnings in 2021
Flash Flood Warning 5, NWS Riverton, WY
NWS Riverton, WY issued this flash flood warning at Aug 2, 2021, 4:46 PM MDT for Lincoln County, Wyoming. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 2, 2021, 4:46 PM MDT (22:46 UTC)
- Expired
- Aug 2, 2021, 6:55 PM MDT
- In force
- 2 hr
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Flood severity
- None
County Lincoln County, WY
The radar
The Pocatello radar (KSFX), 146 km from the middle of the area, began a volume at 22:45 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
Riverton, WY (KRIW), launched 12:00Z, 10.8 hours before the alert went out and 202 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2380 m above ground
- 0-6 km bulk shear
- 20 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.
611
WGUS55 KRIW 022246
FFWRIW
WYC023-030145-
/O.NEW.KRIW.FF.W.0005.210802T2246Z-210803T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Riverton WY
446 PM MDT Mon Aug 2 2021
The National Weather Service in Riverton has issued a
* Flash Flood Warning for...
Northwestern Lincoln County in west central Wyoming...
* Until 745 PM MDT.
* At 446 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Snake River and Greys River Canyons could have debris
flows consisting of mainly mud and rock.
Motorists should use extreme caution through Snake River Canyon as
there could be debris on the road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4323 11077 4315 11077 4312 11102 4321 11100
4322 11100
FLASH FLOOD...RADAR INDICATED
$$
Murrell2 follow-up statements
504
WGUS75 KRIW 022351
FFSRIW
Flash Flood Statement
National Weather Service Riverton WY
551 PM MDT Mon Aug 2 2021
WYC023-030145-
/O.CON.KRIW.FF.W.0005.000000T0000Z-210803T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln WY-
551 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MDT THIS
EVENING FOR NORTHWESTERN LINCOLN COUNTY...
At 551 PM MDT, Doppler radar indicated thunderstorms producing
moderate rain continues in the Snake River Canyon. Doppler radar
estimates between 0.75 and 1 inch of rain has fallen.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Debris flows remain possible in the Snake River Canyon.
Motorists need to slow down, and be prepared for debris on the road
through the Snake River Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4323 11077 4315 11077 4312 11102 4321 11100
4322 11100
FLASH FLOOD...RADAR INDICATED
$$
Murrell944
WGUS75 KRIW 030055
FFSRIW
Flash Flood Statement
National Weather Service Riverton WY
655 PM MDT Mon Aug 2 2021
WYC023-030105-
/O.CAN.KRIW.FF.W.0005.000000T0000Z-210803T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln WY-
655 PM MDT Mon Aug 2 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN LINCOLN
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
LAT...LON 4323 11077 4315 11077 4312 11102 4321 11100
4322 11100
$$
MurrellThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 1:55 PM MDT | Areal Flood Advisory | RIW | Lincoln | 3 hr |
| Aug 2, 3:06 PM MDT | Areal Flood Advisory | RIW | Lincoln | 114 min |
| Aug 2, 3:20 PM MDT | Special Weather Statement | RIW | 25 min | |
| Aug 2, 3:36 PM MDT | Special Weather Statement | RIW | 24 min | |
| Aug 2, 3:48 PM MDT | Special Weather Statement | RIW | Teton | 27 min |
| Aug 2, 4:05 PM MDT | Areal Flood Advisory | RIW | Park, Teton | 2 hr |
| Aug 2, 4:13 PM MDT | Areal Flood Advisory | RIW | Teton | 2 hr |
| Aug 2, 4:28 PM MDT | Special Weather Statement | RIW | Teton | 32 min |
| Aug 2, 4:57 PM MDT | Areal Flood Advisory | RIW | Teton | 48 min |
| Aug 2, 5:05 PM MDT | Special Weather Statement | RIW | Teton | 25 min |
| Aug 2, 5:26 PM MDT | Flash Flood Warning | RIW | Park | 3 hr |
Nearby
Flash Flood Warnings in Wyoming, 2021Every flash flood warning 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.