Alert archive / South Dakota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 149, NWS Aberdeen, SD

August 22, 1999Brown County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 22, 1999, 8:37 PM CDT for Brown County, South Dakota. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 22, 1999, 8:37 PM CDT (01:37 UTC)
Expired
Aug 22, 1999, 9:40 PM CDT
In force
63 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

County Brown County, SD

What was reported inside it

TimeReportWhereRemark
Aug 22, 8:39 PM CDTHail 1Aberdeen, SD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 22, 5:15 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.6 hours before the alert went out and 381 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, Minneapolis, MN at 00:00Z on 1999-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 956 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, Minneapolis, MN at 00:00Z on 1999-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
956 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1032 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aberdeen, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 22, 8:56 PM CDTSevere Thunderstorm WarningABRDay, Spink64 min
Aug 22, 9:16 PM CDTSevere Thunderstorm WarningABRClark64 min
Aug 22, 9:40 PM CDTSevere Thunderstorm WarningABRCodington65 min
Aug 22, 9:59 PM CDTSevere Thunderstorm WarningABRSpink66 min
Aug 22, 10:20 PM CDTSevere Thunderstorm WarningABRClark65 min
Aug 22, 11:03 PM CDTSevere Thunderstorm WarningABRCodington, Hamlin62 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1999Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.