Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 23, NWS Sioux Falls, SD

April 16, 2002Nobles County, Minnesota; Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 16, 2002, 7:29 PM CDT for Nobles County, Minnesota; Osceola County, Iowa. It was in force for 31 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: Apr 16, 2002, 7:29 PM CDT (00:29 UTC)
Expired: Apr 16, 2002, 8:00 PM CDT
In force: 31 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Osceola County, IA, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 74 km from the middle of the area, began a volume at 00:33 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

Time	Report	Where	Remark
Apr 16, 7:30 PM CDT	Thunderstorm Wind 52 E	Adrian, MN	Thunderstorm winds caused tree damage, including at least one large tree blown down onto part of a house. The winds also blew down an Interstate sign.
Apr 16, 7:45 PM CDT	Thunderstorm Wind 57 E	Sibley, IA	Thunderstorm winds blew down power poles, resulting in power outages.
Apr 16, 7:55 PM CDT	Thunderstorm Wind 74 E	Reading, MN
Apr 16, 7:55 PM CDT	Thunderstorm Wind 55 M	(Otg)Worthington Arp, 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.

Issued	Product	Office	Lasted
Apr 16, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 16, 7:15 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 231 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1904 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1836 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 170029
SVRFSD
IAC143-MNC105-170100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
729 PM CDT TUE APR 16 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OSCEOLA COUNTY IN NORTHWEST IOWA
  NOBLES COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 800 PM CDT

* AT 729 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 8 MILES NORTHWEST OF ADRIAN TO 6
  MILES SOUTHEAST OF ASHTON...OR FROM 9 MILES NORTHEAST OF LUVERNE TO
  6 MILES NORTH OF SANBORN...MOVING NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SIBLEY...RUSHMORE AROUND 735 PM CDT
  OCHEYEDAN AROUND 740 PM CDT
  BIGELOW AROUND 745 PM CDT
  WORTHINGTON AROUND 750 PM CDT

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

LAT...LON 4362 9607 4352 9587 4327 9585 4326 9540
          4381 9563

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 7:15 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	30 min
Apr 16, 7:31 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone	44 min
Apr 16, 7:57 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	18 min
Apr 16, 8:06 PM CDT	Severe Thunderstorm Warning	FSD	Jackson	24 min
Apr 16, 8:18 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood	27 min
Apr 16, 7:19 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Sioux	26 min
Apr 16, 10:16 PM CDT	Severe Thunderstorm Warning	FSD	Clay	29 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002 Severe Thunderstorm Warnings in Iowa, 2002 Every 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.