Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 7, NWS Sioux Falls, SD

April 7, 2001Lyon County, Sioux County, Iowa; Nobles County, Rock County, Minnesota; Lincoln County, Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 7, 2001, 2:22 AM CDT for Lyon County, Sioux County, Iowa; Nobles County, Rock County, Minnesota; Lincoln County, Minnehaha County, South Dakota. It was in force for 38 min. 5 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 7, 2001, 2:22 AM CDT (07:22 UTC)
Expired: Apr 7, 2001, 3:00 AM CDT
In force: 38 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Lyon County, IA, Sioux County, IA, Nobles County, MN, Rock County, MN, Lincoln County, SD, Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 36 km from the middle of the area, began a volume at 07:24 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
Apr 7, 2:30 AM CDT	Thunderstorm Wind 52 E	Beresford, SD
Apr 7, 2:32 AM CDT	Thunderstorm Wind 52 M	Orange City Arpt, IA
Apr 7, 2:45 AM CDT	Thunderstorm Wind 61 E	Luverne, MN
Apr 7, 2:45 AM CDT	Thunderstorm Wind 61 E	Larchwood, IA
Apr 7, 2:58 AM CDT	Thunderstorm Wind 69 E	Dell Rapids, SD

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 7, 1:45 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 7.4 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1038 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 412 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 070723
SVRFSD
IAC119-167-MNC105-133-SDC083-099-101-070800-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
222 AM CDT SAT APR 7 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA
  LYON COUNTY IN NORTHWEST IOWA
  SIOUX COUNTY IN NORTHWEST IOWA
  LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
  MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA
  NOBLES COUNTY IN SOUTHWEST MINNESOTA
  ROCK COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 300 AM CDT

* AT 222 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 6 MILES SOUTH OF WORTHING TO 17
  MILES SOUTH OF ALTON...OR FROM 11 MILES WEST OF CANTON TO 8 MILES
  SOUTHEAST OF LE MARS...MOVING NORTH AT 60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ALTON...INWOOD...ORANGE CITY...ROCK VALLEY AROUND 230 AM CDT
  DOON...HULL AROUND 235 AM CDT
  SIOUX FALLS...ALVORD...BOYDEN...HOSPERS AROUND 240 AM CDT

WIND GUSTS FROM 50 TO 70 MPH HAVE BEEN REPORTED WITH THIS STORM. 
THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. GO INSIDE A
STURDY BUILDING AND STAY AWAY FROM WINDOWS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 2:11 AM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	34 min
Apr 7, 3:05 AM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola	25 min
Apr 7, 3:29 AM CDT	Severe Thunderstorm Warning	FSD	Nobles	31 min
Apr 7, 3:51 AM CDT	Tornado Warning	FSD	Murray, Nobles	24 min
Apr 7, 4:23 AM CDT	Severe Thunderstorm Warning	FSD	Murray	37 min
Apr 6, 9:17 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury, Miner	28 min
Apr 6, 9:45 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	30 min
Apr 7, 2:22 AM CDT	Severe Thunderstorm Warning	FSD	Moody	38 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2001 Severe Thunderstorm Warnings in Minnesota, 2001 Severe Thunderstorm Warnings in South Dakota, 2001 Every severe thunderstorm warning in 2001

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.