Alert archive / Minnesota / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 663

September 1, 20024 states

The Storm Prediction Center issued this severe thunderstorm watch at Sep 1, 2002, 3:45 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 1, 2002, 3:45 PM CDT (20:45 UTC)
Expired
Sep 1, 2002, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 33 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Swift County, MN, Yellow Medicine County, MN, Dakota County, NE, Dixon County, NE, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 51 km from the middle of the area, began a volume at 20:46 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

Omaha, NE (KOAX), launched 12:00Z, 8.8 hours before the alert went out and 243 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, Omaha, NE at 12:00Z on 2002-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 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, Omaha, NE at 12:00Z on 2002-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
58 J/kg
Mixed-layer CIN
-221 J/kg
Mixed-layer LCL
1634 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
162 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
Sep 1, 5:20 PM CDTSevere Thunderstorm WatchSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Emmet and 14 more6 hr
Aug 31, 7:00 PM CDTSevere Thunderstorm WatchSPCKittson, Marshall, Pennington, Polk, Red Lake, Roseau5 hr
Aug 31, 9:55 PM CDTSevere Thunderstorm WatchSPCClay, Clearwater, Kittson, Lake of the Woods, Mahnomen, Marshall and 6 more6 hr
Sep 1, 12:45 PM CDTSevere Thunderstorm WatchSPCAnoka, Benton, Carver, Chisago, Dakota, Hennepin and 17 more6 hr
Sep 1, 6:15 PM CDTSevere Thunderstorm WatchSPCPine, Washington6 hr

Nearby

Severe Thunderstorm Watches in Minnesota, 2002Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in South Dakota, 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.