Alert archive / Iowa / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 16, NWS Sioux Falls, SD

April 16, 2002Plymouth County, Sioux County, Woodbury County, Iowa; Union County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 16, 2002, 6:28 PM CDT for Plymouth County, Sioux County, Woodbury County, Iowa; Union County, South Dakota. It was in force for 47 min. 8 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, 6:28 PM CDT (23:28 UTC)
Expired: Apr 16, 2002, 7:15 PM CDT
In force: 47 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Union County, SD

The radar

The Sioux Falls radar (KFSD), 89 km from the middle of the area, began a volume at 23:27 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, 6:34 PM CDT	Thunderstorm Wind 57 E	Lawton, IA	Thunderstorm winds blew down tree limbs and tore shingles from roofs.
Apr 16, 6:41 PM CDT	Thunderstorm Wind 52 E	Kingsley, IA
Apr 16, 6:45 PM CDT	Thunderstorm Wind 56 M	Le Mars Muni Arpt, IA
Apr 16, 6:45 PM CDT	Thunderstorm Wind 61 E	Hawarden, IA	Thunderstorm winds rolled a semi truck and crumpled a storage tank.
Apr 16, 6:50 PM CDT	Thunderstorm Wind 57 E	Ireton, IA
Apr 16, 7:00 PM CDT	Thunderstorm Wind 57 E	Sioux Center, IA
Apr 16, 7:05 PM CDT	Thunderstorm Wind 55 M	Orange City Arpt, IA
Apr 16, 7:10 PM CDT	Thunderstorm Wind 57 E	Sioux City, IA	Thunderstorm winds blew a tree onto a garage, heavily damaging the garage and a restored vehicle inside.

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, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 169 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: 1529 J/kg
Mixed-layer CIN: -420 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 404 m²/s²
0-3 km storm-relative helicity: 417 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 162328
SVRFSD
IAC149-167-193-SDC127-170015-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PLYMOUTH COUNTY IN NORTHWEST IOWA
  SIOUX COUNTY IN NORTHWEST IOWA
  WOODBURY COUNTY IN NORTHWEST IOWA
  UNION COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 715 PM CDT

* AT 628 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 8 MILES WEST OF AKRON TO 4 MILES
  SOUTH OF SIOUX CITY...OR FROM 8 MILES WEST OF AKRON TO 2 MILES
  SOUTHEAST OF SOUTH SIOUX CITY...MOVING NORTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MOVILLE...AKRON AROUND 635 PM CDT
  HINTON AROUND 640 PM CDT
  MERRILL...KINGSLEY AROUND 645 PM CDT
  HAWARDEN AROUND 650 PM CDT
  LE MARS AROUND 655 PM CDT
  REMSEN...IRETON AROUND 700 PM CDT

THIS IS A DANGEROUS STORM...TAKE SHELTER.

LAT...LON 4286 9678 4249 9649 4232 9601 4305 9588
          4314 9615 4315 9636

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 6:51 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien	24 min
Apr 16, 5:23 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Minnehaha, Moody, Turner	22 min
Apr 16, 5:45 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	45 min
Apr 16, 5:46 PM CDT	Severe Thunderstorm Warning	FSD	Turner	29 min
Apr 16, 5:52 PM CDT	Severe Thunderstorm Warning	FSD	Lake	23 min
Apr 16, 5:54 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	36 min
Apr 16, 5:56 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	34 min
Apr 16, 6:27 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	33 min
Apr 16, 6:41 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2002 Severe Thunderstorm Warnings in South Dakota, 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.