Alert archive / Iowa / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 71, NWS Sioux Falls, SD

June 23, 2003Cherokee County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 23, 2003, 11:21 PM CDT for Cherokee County, Iowa. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 23, 2003, 11:21 PM CDT (04:21 UTC)
Expired: Jun 24, 2003, 12:00 AM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Cherokee County, IA

The radar

The Sioux Falls radar (KFSD), 121 km from the middle of the area, began a volume at 04:21 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 23, 8:55 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.4 hours before the alert went out and 283 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: 1955 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1314 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 240421
SVRFSD
IAC035-240500-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1120 PM CDT MON JUN 23 2003

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHEROKEE COUNTY IN NORTHWEST IOWA

* UNTIL MIDNIGHT CDT

* AT 1120 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 5 MILES SOUTH OF MARCUS...MOVING NORTHEAST 
  AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CLEGHORN AROUND 1130 PM CDT

A TORNADO WATCH IS ALSO IN EFFECT FOR THE AREA. SEVERE THUNDERSTORMS
CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR
SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

THIS STORM WILL PRODUCE LARGE HAIL. GO INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

LAT...LON 4281 9587 4267 9580 4281 9541 4292 9556

$$
CHAPMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 9:12 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	48 min
Jun 23, 9:37 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	23 min
Jun 23, 10:02 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	28 min
Jun 23, 10:22 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth	38 min
Jun 23, 10:38 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	52 min
Jun 23, 10:50 PM CDT	Tornado Warning	FSD	Ida, Woodbury	25 min
Jun 23, 11:12 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	48 min
Jun 23, 11:19 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	56 min
Jun 23, 11:31 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	44 min
Jun 23, 11:37 PM CDT	Severe Thunderstorm Warning	FSD	Clay, O'Brien	53 min
Jun 23, 11:53 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	22 min
Jun 23, 11:55 PM CDT	Severe Thunderstorm Warning	FSD	Ida	65 min
Jun 24, 12:05 AM CDT	Severe Thunderstorm Warning	FSD	Plymouth	25 min
Jun 24, 12:16 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee	44 min
Jun 24, 12:52 AM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	38 min
Jun 24, 2:25 AM CDT	Flash Flood Warning	FSD	Cherokee, Ida, Woodbury	4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2003 Every severe thunderstorm warning in 2003

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.