Alert archive / Wyoming / Flash Flood Warnings in 1998

Flash Flood Warning 4, NWS Rapid City, SD

July 2, 1998Weston County, Wyoming

NWS Rapid City, SD issued this flash flood warning at Jul 2, 1998, 7:01 PM MDT for Weston 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
Jul 2, 1998, 7:01 PM MDT (01:01 UTC)
Expired
Jul 3, 1998, 1:00 AM MDT
In force
6 hr
Issued by
NWS Rapid City, SD
Area
Whole counties

County Weston County, WY

The radar

The Rapid City radar (KUDX), 143 km from the middle of the area, began a volume at 01:04 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

Rapid City, SD (KUNR), launched 00:00Z, 1.0 hours before the alert went out and 137 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, Rapid City, SD at 00:00Z on 1998-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1778 joules per kilogram.LCLLFCEL10008507005003002001001 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, Rapid City, SD at 00:00Z on 1998-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
1778 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1451 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.6
Supercell composite
6.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 2, 6:23 PM MDTSevere Thunderstorm WarningUNRTripp52 min
Jul 2, 9:22 PM MDTSevere Thunderstorm WarningUNRCuster48 min
Jul 2, 10:08 PM MDTSevere Thunderstorm WarningUNR62 min
Jul 2, 11:12 PM MDTSevere Thunderstorm WarningUNR48 min
Jul 3, 12:00 AM MDTSevere Thunderstorm WarningUNRBennett65 min
Jul 3, 2:51 AM MDTFlash Flood WarningUNRBennett, Jackson5 hr
Jul 3, 2:35 PM MDTSevere Thunderstorm WarningUNRLawrence45 min
Jul 3, 3:12 PM MDTSevere Thunderstorm WarningUNRLawrence48 min
Jul 2, 6:39 PM MDTSevere Thunderstorm WarningUNRWeston51 min
Jul 2, 6:39 PM MDTSevere Thunderstorm WarningUNRWeston46 min
Jul 2, 6:54 PM MDTSevere Thunderstorm WarningUNRCampbell46 min
Jul 2, 7:31 PM MDTFlash Flood WarningUNRWeston59 min
Jul 2, 7:31 PM MDTSevere Thunderstorm WarningUNRWeston59 min
Jul 2, 7:41 PM MDTSevere Thunderstorm WarningUNRCampbell59 min
Jul 2, 9:04 PM MDTSevere Thunderstorm WarningUNRCampbell46 min
Jul 2, 9:31 PM MDTFlash Flood WarningUNRCampbell, Weston6 hr

Nearby

Flash Flood Warnings in Wyoming, 1998Every flash flood warning in 1998

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.