Alert archive / Iowa / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 101, NWS Des Moines, IA

June 11, 2002Boone County, Webster County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 11, 2002, 12:42 AM CDT for Boone County, Webster County, Iowa. It was in force for 63 min. 2 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: Jun 11, 2002, 12:42 AM CDT (05:42 UTC)
Expired: Jun 11, 2002, 1:45 AM CDT
In force: 63 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Boone County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 71 km from the middle of the area, began a volume at 05:44 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 11, 12:55 AM CDT	Thunderstorm Wind 62 M	Ft Dodge Muni Arpt, IA
Jun 11, 12:58 AM CDT	Thunderstorm Wind 56 E	Ft Dodge, 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 10, 9:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.7 hours before the alert went out and 213 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: 4189 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1042 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 13.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 110542
SVRDSM
IAC015-187-110645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1242 AM CDT TUE JUN 11 2002

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BOONE COUNTY IN CENTRAL IOWA
  WEBSTER COUNTY IN CENTRAL IOWA
  THIS INCLUDES THE CITY OF FORT DODGE

* UNTIL 145 AM CDT

* AT 1239 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 4 MILES SOUTHWEST OF HARCOURT TO
  11 MILES WEST OF BERKLEY...OR FROM 20 MILES SOUTH OF FORT DODGE TO
  42 MILES NORTHWEST OF DES MOINES...MOVING EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE...

  NEAR DAYTON AROUND 1245 AM...
  NEAR OGDEN AROUND 1250 AM...
  NEAR FRASER AROUND 1255 AM...
  NEAR BOONE AROUND 100 AM AND
  NEAR LUTHER AROUND 100 AM.

OTHER WARNING LOCATIONS INCLUDE BADGER...BARNUM...BEAVER...BOONE...
BOXHOLM...CALLENDER...CLARE...DAYTON...DUNCOMBE...FRASER...GOWRIE...
LEHIGH...LUTHER...MOORLAND...OGDEN...OTHO...PILOT MOUND AND VINCENT.

DAMAGING WINDS OF 60 TO 70 MILES AN HOUR ARE LIKELY IN THE WARNED
AREA.

MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU LIVE IN A
MOBILE HOME...SEEK SHELTER IN A STURDY BUILDING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM TUESDAY
MORNING FOR WESTERN IOWA.

LAT...LON 4262 9442 4222 9440 4220 9417 4187 9414
          4188 9373 4226 9396 4263 9400

KULA

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 10, 11:11 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	49 min
Jun 10, 11:35 PM CDT	Severe Thunderstorm Warning	DMX	Carroll	55 min
Jun 10, 11:53 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	52 min
Jun 11, 12:59 AM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Wright	46 min
Jun 11, 1:17 AM CDT	Severe Thunderstorm Warning	DMX	Kossuth	43 min
Jun 11, 1:24 AM CDT	Severe Thunderstorm Warning	DMX	Franklin, Hardin	51 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.