Alert archive / Iowa / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 49, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Apr 18, 2002, 8:11 PM CDT for Poweshiek County, Iowa. It was in force for 64 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
- Apr 18, 2002, 8:11 PM CDT (01:11 UTC)
- Expired
- Apr 18, 2002, 9:15 PM CDT
- In force
- 64 min
- Issued by
- NWS Des Moines, IA
- Area
- Counties, with a storm outline in the text
County Poweshiek County, IA
The radar
The Des Moines radar (KDMX), 95 km from the middle of the area, began a volume at 01:10 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 18, 8:21 PM CDT | Hail 2 | Brooklyn, 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
Davenport, (KDVN), launched 00:00Z, 1.2 hours before the alert went out and 173 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.
- Mixed-layer CAPE
- 1636 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1702 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KDMX 190111 SVRDSM IAC157-190215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 808 PM CDT THU APR 18 2002 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... POWESHIEK COUNTY IN CENTRAL IOWA * UNTIL 915 PM CDT * AT 805 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS 8 MILES SOUTHWEST OF GRINNELL...OR ABOUT 39 MILES EAST OF DES MOINES...MOVING EAST AT 35 MPH. ANOTHER SEVERE THUNDERSTORM WAS LOCATED 2 MILES WEST OF MALCOM MOVING EAST AT 35 MPH. * THE SEVERE THUNDERSTORMS WILL BE... NEAR GRINNELL AROUND 815 PM... 8 MILES NORTH OF MONTEZUMA AROUND 815 PM AND NEAR BROOKLYN AROUND 830 PM. AT 801 PM A GUSTNADO WAS REPORTED WITH THE THUNDERSTORM 6 MILES NORTHWEST OF BROOKLYN. HAIL UP TO THE SIZE OF NICKELS IS LIKELY IN THE WARNED AREA. VERY STRONG WINDS UP TO 60 MPH ARE POSSIBLE IN THE WARNED AREA. STAY AWAY FROM WINDOWS DURING A SEVERE STORM...WIND GUSTS OVER 70 MPH COULD BLOW THEM OUT. A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM THURSDAY EVENING FOR IOWA. LAT...LON 4184 9276 4153 9275 4154 9232 4184 9232 JAW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 7:02 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 58 min |
| Apr 18, 7:04 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 26 min |
| Apr 18, 7:04 PM CDT | Tornado Warning | DMX | Jasper | 56 min |
| Apr 18, 7:10 PM CDT | Tornado Warning | DMX | Black Hawk | 50 min |
| Apr 18, 7:24 PM CDT | Tornado Warning | DMX | Decatur, Ringgold | 51 min |
| Apr 18, 7:38 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion | 52 min |
| Apr 18, 7:57 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 33 min |
| Apr 18, 9:10 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 50 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2002Every 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.