Alert archive / Wyoming / Flash Flood Warnings in 2023

Flash Flood Warning 1, NWS Riverton, WY

June 7, 2023Fremont County, Wyoming

NWS Riverton, WY issued this flash flood warning at Jun 7, 2023, 5:37 PM MDT for Fremont County, Wyoming. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 7, 2023, 5:37 PM MDT (23:37 UTC)
Expired
Jun 8, 2023, 12:00 AM MDT
In force
6 hr
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Flood severity
None

County Fremont County, WY

The radar

The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 23:36 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

Grand Junction, CO (KGJT), launched 12:00Z, 11.6 hours before the alert went out and 435 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.

Skew-T log-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2023-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2023-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2059 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 7, 11:53 AM MDTRiver Flood AdvisoryRIWLincoln13 days
Jun 7, 12:19 PM MDTAreal Flood AdvisoryRIWJohnson6 hr
Jun 7, 1:29 PM MDTAreal Flood AdvisoryRIWJohnson7 hr
Jun 7, 1:39 PM MDTSpecial Weather StatementRIWNatrona36 min
Jun 7, 2:07 PM MDTSpecial Weather StatementRIWJohnson38 min
Jun 7, 2:10 PM MDTSpecial Weather StatementRIW35 min
Jun 7, 2:41 PM MDTSpecial Weather StatementRIWFremont34 min
Jun 7, 3:17 PM MDTSpecial Weather StatementRIWFremont28 min
Jun 7, 5:12 PM MDTAreal Flood AdvisoryRIWFremont53 min
Jun 7, 5:20 PM MDTAreal Flood AdvisoryRIWHot Springs5 hr

Nearby

Flash Flood Warnings in Wyoming, 2023Every flash flood warning in 2023

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.