Alert archive / Iowa / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 3, NWS Des Moines, IA

March 8, 2002Clarke County, Decatur County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Mar 8, 2002, 10:53 PM CST for Clarke County, Decatur County, Iowa. It was in force for 32 min. 3 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: Mar 8, 2002, 10:53 PM CST (04:53 UTC)
Expired: Mar 8, 2002, 11:25 PM CST
In force: 32 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Clarke County, IA, Decatur County, IA

The radar

The Des Moines radar (KDMX), 92 km from the middle of the area, began a volume at 04:55 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
Mar 8, 11:08 PM CST	Thunderstorm Wind 50 M	Lamoni Arpt, IA
Mar 8, 11:25 PM CST	Thunderstorm Wind 50 E	Osceola, IA
Mar 8, 11:29 PM CST	Thunderstorm Wind 61 E	Osceola, IA	Driver of semi-tractortrailer rig received minor injuries as rig was blown off the highway.

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 00:00Z, 4.9 hours before the alert went out and 217 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: 8 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 412 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 457 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 090453
SVRDSM
IAC039-053-090525-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1051 PM CST FRI MAR 8 2002

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLARKE COUNTY IN SOUTH CENTRAL IOWA
  DECATUR COUNTY IN SOUTH CENTRAL IOWA

* UNTIL 1125 PM CST

* AT 1050 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 22 MILES NORTHWEST OF OSCEOLA TO
  LAMONI...OR FROM 40 MILES SOUTHWEST OF DES MOINES TO 69 MILES SOUTH
  OF DES MOINES...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE...
  NEAR LEON AROUND 1115 PM
  NEAR LAMONI NOW
  NEAR OSCEOLA AROUND 1115 PM

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

STAY AWAY FROM WINDOWS DURING A SEVERE STORM...WIND GUSTS OVER 70 MPH
COULD BLOW THEM OUT.

LAT...LON 4115 9402 4051 9398 4059 9356 4115 9358

KULA

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 8, 10:06 PM CST	Severe Thunderstorm Warning	DMX	Adair, Guthrie	29 min
Mar 8, 10:34 PM CST	Severe Thunderstorm Warning	DMX	Ringgold, Union	41 min
Mar 8, 11:18 PM CST	Severe Thunderstorm Warning	DMX	Lucas, Wayne	42 min
Mar 8, 11:29 PM CST	Severe Thunderstorm Warning	DMX	Warren	46 min
Mar 8, 11:46 PM CST	Severe Thunderstorm Warning	DMX	Jasper, Marion, Polk	44 min
Mar 8, 11:58 PM CST	Severe Thunderstorm Warning	DMX	Appanoose, Monroe	47 min
Mar 9, 12:13 AM CST	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek, Tama	47 min
Mar 9, 12:20 AM CST	Severe Thunderstorm Warning	DMX	Davis, Wapello	40 min
Mar 9, 12:28 AM CST	Severe Thunderstorm Warning	DMX	Grundy, Marshall, Tama	47 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.