Alert archive / South Dakota / Flash Flood Warnings in 1999

Flash Flood Warning 2, NWS Rapid City, SD

May 9, 1999Tripp County, South Dakota

NWS Rapid City, SD issued this flash flood warning at May 9, 1999, 11:11 PM CDT for Tripp County, South Dakota. It was in force for 4 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
May 9, 1999, 11:11 PM CDT (04:11 UTC)
Expired
May 10, 1999, 3:10 AM CDT
In force
4 hr
Issued by
NWS Rapid City, SD
Area
Whole counties

County Tripp County, SD

The radar

The North Platte radar (KLNX), 164 km from the middle of the area, began a volume at 04:15 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

Aberdeen, SD (KABR), launched 00:00Z, 4.2 hours before the alert went out and 209 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, Aberdeen, SD at 00:00Z on 1999-05-10Temperature 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, Aberdeen, SD at 00:00Z on 1999-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 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
1346 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
364 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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
May 9, 7:00 PM CDTSevere Thunderstorm WarningUNRBennett50 min
May 9, 7:13 PM CDTSevere Thunderstorm WarningUNRJackson47 min
May 9, 7:25 PM CDTSevere Thunderstorm WarningUNRTripp50 min
May 9, 7:32 PM CDTTornado WarningUNRTripp33 min
May 9, 7:39 PM CDTTornado WarningUNRMellette31 min
May 9, 7:47 PM CDTSevere Thunderstorm WarningUNRMellette, Todd63 min
May 9, 7:55 PM CDTTornado WarningUNRMellette, Todd50 min
May 9, 8:19 PM CDTTornado WarningUNRMellette61 min
May 9, 8:38 PM CDTSevere Thunderstorm WarningUNRTripp47 min
May 9, 8:49 PM CDTTornado WarningUNRTodd46 min
May 9, 9:05 PM CDTSevere Thunderstorm WarningUNRCuster, Pennington35 min
May 9, 9:31 PM CDTTornado WarningUNRTodd34 min
May 9, 9:56 PM CDTFlash Flood WarningUNRMellette, Todd4 hr
May 9, 10:04 PM CDTSevere Thunderstorm WarningUNRTodd66 min
May 10, 2:23 AM CDTFlash Flood WarningUNRTripp6 hr

Nearby

Flash Flood Warnings in South Dakota, 1999Every flash flood warning in 1999

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.