Alert archive / Wyoming / Flash Flood Watches in 2008

Flash Flood Watch 2, NWS Riverton, WY

August 31, 2008Fremont County, Hot Springs County, Park County, Wyoming

NWS Riverton, WY issued this flash flood watch at Aug 31, 2008, 1:42 AM MDT for Fremont County, Hot Springs County, Park County, Wyoming. It took effect at Aug 31, 2008, 6:00 PM MDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Aug 31, 2008, 1:42 AM MDT (07:42 UTC)
In effect from
Aug 31, 2008, 6:00 PM MDT
Expired
Sep 1, 2008, 2:18 AM MDT
In force
8 hr
Issued by
NWS Riverton, WY
Flood severity
None

Counties Fremont County, WY, Hot Springs County, WY, Park County, WY

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 7.7 hours before the alert went out and 414 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, Salt Lake City I, UT at 00:00Z on 2008-08-31Temperature 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 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 00:00Z on 2008-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.19395878Sfc1 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
4877 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
75 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
Aug 31, 1:13 PM MDTSpecial Weather StatementRIWTeton62 min
Aug 31, 1:53 PM MDTSpecial Weather StatementRIWPark67 min
Aug 31, 2:59 PM MDTSpecial Weather StatementRIWTeton61 min
Aug 31, 3:02 PM MDTSpecial Weather StatementRIWPark58 min
Aug 31, 4:29 PM MDTSpecial Weather StatementRIW46 min
Aug 31, 4:56 PM MDTSpecial Weather StatementRIWTeton49 min

Nearby

Flash Flood Watches in Wyoming, 2008Every flash flood watch in 2008

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.