Alert archive / South Dakota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 21, NWS Aberdeen, SD

May 14, 1991Marshall County, Roberts County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at May 14, 1991, 7:39 PM CDT for Marshall County, Roberts County, South Dakota. It was in force for 66 min. 3 reports 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
May 14, 1991, 7:39 PM CDT (00:39 UTC)
Expired
May 14, 1991, 8:45 PM CDT
In force
66 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

Counties Marshall County, SD, Roberts County, SD

What was reported inside it

TimeReportWhereRemark
May 14, 7:45 PM CDTHail 1.75Roberts, SD
May 14, 8:02 PM CDTHail 1.75Marshall, SD
May 14, 8:03 PM CDTHail 0.75Marshall, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.7 hours before the alert went out and 289 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, Bismarck Municip, ND at 00:00Z on 1991-05-15Temperature 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, Bismarck Municip, ND at 00:00Z on 1991-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
2593 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
481 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
May 14, 7:32 PM CDTSevere Thunderstorm WarningABRCorson, Dewey58 min
May 14, 8:13 PM CDTSevere Thunderstorm WarningABRDay62 min
May 14, 9:00 PM CDTSevere Thunderstorm WarningABRDay, Marshall60 min
May 15, 12:12 AM CDTSevere Thunderstorm WarningABRBrown, McPherson63 min
May 15, 1:28 PM CDTTornado WarningABREdmunds32 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1991Every severe thunderstorm warning in 1991

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.