Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 276, NWS Sioux Falls, SD

August 11, 2002Cottonwood County, Jackson County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 11, 2002, 11:42 PM CDT for Cottonwood County, Jackson County, Minnesota. It was in force for 48 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 11, 2002, 11:42 PM CDT (04:42 UTC)
Expired
Aug 12, 2002, 12:30 AM CDT
In force
48 min
Issued by
NWS Sioux Falls, SD
Area
Counties, with a storm outline in the text

Counties Cottonwood County, MN, Jackson County, MN

The radar

The Sioux Falls radar (KFSD), 125 km from the middle of the area, began a volume at 04:46 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.

What was reported inside it

TimeReportWhereRemark
Aug 11, 11:52 PM CDTThunderstorm Wind 57 EWestbrook, MNThunderstorm winds caused tree damage, including many branches down. The winds also blew down power lines.
Aug 12, 12:02 AM CDTThunderstorm Wind 57 MJeffers, MNA thunderstorm wind gust was recorded by automated RWIS (road weather information system) equipment.
Aug 12, 12:15 AM CDTThunderstorm Wind 76 MJackson, MNThunderstorm winds, measured by privately owned equipment, cracked windows in a house.
Aug 12, 12:20 AM CDTThunderstorm Wind 52 EMountain Lake, MN

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 11, 9:55 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.7 hours before the alert went out and 168 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 2002-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1443 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 2002-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
1443 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
1692 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

276 
WUUS53 KFSD 120442
SVRFSD
MNC033-063-120530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1142 PM CDT SUN AUG 11 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COTTONWOOD COUNTY IN SOUTHWEST MINNESOTA
  JACKSON COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 1230 AM CDT

* AT 1140 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS PRODUCING DAMAGING WINDS FROM 3 MILES
  WEST OF WESTBROOK TO 30   MILES SOUTHWEST OF HERON LAKE...OR FROM 
  13 MILES EAST OF SLAYTON TO   10 MILES SOUTHWEST OF 
  WORTHINGTON...MOVING EAST AT 55 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STORDEN AROUND 1150 PM CDT
  JEFFERS...HERON LAKE AROUND 1155 PM CDT
  WINDOM...LAKEFIELD...BINGHAM LAKE AROUND 1205 AM CDT
  MOUNTAIN LAKE...BERGEN AROUND 1210 AM CDT
  JACKSON AROUND 1215 AM CDT

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. GO INSIDE A
STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4413 9547 4352 9545 4351 9486 4411 9487

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 11, 10:52 PM CDTSevere Thunderstorm WarningFSDRock38 min
Aug 11, 10:59 PM CDTSevere Thunderstorm WarningFSDLyon, Murray, Pipestone46 min
Aug 11, 11:13 PM CDTSevere Thunderstorm WarningFSDNobles32 min
Aug 11, 11:44 PM CDTSevere Thunderstorm WarningFSDNobles46 min
Aug 11, 11:46 PM CDTSevere Thunderstorm WarningFSDNobles14 min
Aug 12, 1:08 AM CDTSevere Thunderstorm WarningFSDRock37 min
Aug 12, 2:25 AM CDTSevere Thunderstorm WarningFSDJackson50 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.