Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 252, NWS Sioux Falls, SD

June 18, 2001Cherokee County, Ida County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 18, 2001, 6:40 PM CDT for Cherokee County, Ida County, Woodbury County, Iowa. It was in force for 35 min. 4 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jun 18, 2001, 6:40 PM CDT (23:40 UTC)
Expired: Jun 18, 2001, 7:15 PM CDT
In force: 35 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Cherokee County, IA, Ida County, IA, Woodbury County, IA

The radar

The Omaha radar (KOAX), 136 km from the middle of the area, began a volume at 23:42 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
Jun 18, 7:11 PM CDT	Hail 1.75	Holstein, IA
Jun 18, 7:12 PM CDT	Hail 1	Hornick, IA
Jun 18, 7:16 PM CDT	Hail 0.75	Holstein, IA
Jun 18, 7:19 PM CDT	Hail 0.88	Oto, IA

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
Jun 18, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 136 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: 710 J/kg
Mixed-layer CIN: -626 J/kg
Mixed-layer LCL: 1779 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 182342
SVRFSD

IAC035-093-193-190015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
640 PM CDT MON JUN 18 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CHEROKEE COUNTY IN NORTHWEST IOWA
  IDA COUNTY IN NORTHWEST IOWA
  SOUTHEAST WOODBURY COUNTY IN NORTHWEST IOWA

* UNTIL 715 PM CDT

* AT 640 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES SOUTH OF PIERSON...OR ABOUT 22 MILES
  NORTHWEST OF IDA GROVE...MOVING EAST AT 30 MPH.  OTHER STRONG STORMS
  ARE DEVELOPING ALONG A LINE BACK TO SLOAN IN SOUTHWEST WOODBURY
  COUNTY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WASHTA...CUSHING AROUND 650 PM CDT
  QUIMBY AROUND 700 PM CDT
  HOLSTEIN AROUND 705 PM CDT
  GALVA AROUND 715 PM CDT

THESE STORMS WILL PRODUCE LARGE HAIL AND DAMAGING WIND. GO INSIDE A
STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4257 9589 4223 9633 4221 9583 4250 9541
          4272 9542

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.