Alert archive / North Dakota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 75, NWS Grand Forks, ND

July 21, 1991Dickey County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 21, 1991, 4:02 PM CDT for Dickey County, North Dakota. It was in force for 28 min.

The area

The counties it named.

The facts

Issued
Jul 21, 1991, 4:02 PM CDT (21:02 UTC)
Expired
Jul 21, 1991, 4:30 PM CDT
In force
28 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Dickey County, ND

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 9.0 hours before the alert went out and 407 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 12:00Z on 1991-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 580 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 12:00Z on 1991-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 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
580 J/kg
Mixed-layer CIN
-163 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
42 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 Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 11:02 AM CDTSevere Thunderstorm WarningFGFDickey28 min
Jul 21, 3:03 PM CDTSevere Thunderstorm WarningFGFDickey57 min

Nearby

Severe Thunderstorm Warnings in North 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; the sounding from the Mesonet's radiosonde archive.