Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 39, NWS Sioux Falls, SD

April 22, 2001Ida County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 22, 2001, 10:14 PM CDT for Ida County, Woodbury County, Iowa. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 22, 2001, 10:14 PM CDT (03:14 UTC)
Expired: Apr 22, 2001, 10:45 PM CDT
In force: 31 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Ida County, IA, Woodbury County, IA

The radar

The Omaha radar (KOAX), 128 km from the middle of the area, began a volume at 03:16 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
Apr 22, 9:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.2 hours before the alert went out and 128 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: 965 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 627 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 230317 CCA
SVRFSD

IAC093-193-230345-

BULLETIN - EAS ACTIVATION REQUESTED...CORRECTED...
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1014 PM CDT SUN APR 22 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  IDA COUNTY IN NORTHWEST IOWA
  SOUTHEASTERN WOODBURY COUNTY IN NORTHWEST IOWA

* UNTIL 1045 PM CDT

* AT 1014 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 2 MILES EAST OF SALIX TO 15 
  MILES SOUTH OF SMITHLAND...OR FROM 15 MILES SOUTHEAST OF SIOUX 
  CITY TO 33 MILES NORTH OF BLAIR...MOVING NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  OTO AROUND 1025 PM CDT
  DANBURY AROUND 1030 PM CDT
  CUSHING AROUND 1035 PM CDT
  BATTLE CREEK AROUND 1040 PM CDT

THIS STORM WILL PRODUCE DAMAGING WIND. GO INSIDE A STURDY BUILDING
AND STAY AWAY FROM WINDOWS.

LAT...LON 4213 9610 E4208 9614 4181 9611 4229 9550
          4256 9552 4252 9571

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 7:59 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Ida	31 min
Apr 22, 8:41 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.