Alert archive / North Dakota / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 586

August 8, 20025 counties in Minnesota; 12 counties in North Dakota; 12 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 8, 2002, 8:50 PM CDT for 5 counties in Minnesota; 12 counties in North Dakota; 12 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 8, 2002, 8:50 PM CDT (01:50 UTC)
Expired
Aug 9, 2002, 2:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 29 counties

Clay County, MN, Norman County, MN, Polk County, MN, Red Lake County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Grand Forks County, ND, Griggs County, ND, LaMoure County, ND, Nelson County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, McPherson County, SD, Roberts County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 62 km from the middle of the area, began a volume at 01:49 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.

Warnings issued inside it

5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 8, 8:56 PM CDTSevere Thunderstorm WarningFGFPolk49 min
Aug 8, 9:03 PM CDTSevere Thunderstorm WarningABRCampbell, McPherson42 min
Aug 8, 11:05 PM CDTSevere Thunderstorm WarningFGFGriggs40 min
Aug 8, 11:15 PM CDTSevere Thunderstorm WarningFGFBenson, Nelson, Ramsey60 min
Aug 8, 11:29 PM CDTSevere Thunderstorm WarningFGFSteele46 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.8 hours before the alert went out and 121 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 2002-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 678 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, Aberdeen, SD at 00:00Z on 2002-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
678 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
1867 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 5:35 PM CDTSevere Thunderstorm WatchSPCBig Stone, Lac qui Parle, Lincoln, Pope, Stevens, Swift and 1 more5 hr

Nearby

Severe Thunderstorm Watches in North Dakota, 2002Severe Thunderstorm Watches in South Dakota, 2002Severe Thunderstorm Watches in Minnesota, 2002Every severe thunderstorm watch in 2002

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.