Alert archive / Iowa / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 83, NWS Sioux Falls, SD

June 7, 2002Plymouth County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 7, 2002, 5:47 PM CDT for Plymouth County, Iowa. It was in force for 43 min. 1 report 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: Jun 7, 2002, 5:47 PM CDT (22:47 UTC)
Expired: Jun 7, 2002, 6:30 PM CDT
In force: 43 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Plymouth County, IA

The radar

The Sioux Falls radar (KFSD), 100 km from the middle of the area, began a volume at 22:50 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
Jun 7, 5:53 PM CDT	Thunderstorm Wind 57 E	Merrill, 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.8 hours before the alert went out and 159 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: 1517 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 82 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 072247
SVRFSD
IAC149-072330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
547 PM CDT FRI JUN 7 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 630 PM CDT

* AT 547 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES WEST OF MERRILL...OR ABOUT 10 MILES
  SOUTHEAST OF AKRON...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HINTON AROUND 555 PM CDT
  MERRILL AROUND 605 PM CDT
  LE MARS AROUND 615 PM CDT
  REMSEN AROUND 630 PM CDT

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

LAT...LON 4279 9656 4262 9649 4261 9595 4292 9592

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 5:01 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	29 min
Jun 7, 5:41 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	34 min
Jun 7, 5:49 PM CDT	Tornado Warning	FSD	O'Brien	26 min
Jun 7, 5:59 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	46 min
Jun 7, 6:03 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson, Osceola	42 min
Jun 7, 6:13 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	32 min
Jun 7, 6:29 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	46 min
Jun 7, 6:41 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	34 min
Jun 7, 6:42 PM CDT	Severe Thunderstorm Warning	FSD	Clay	18 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.