Alert archive / Iowa / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 21, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 18, 2002, 8:17 PM CDT for Linn County, Iowa. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2002, 8:17 PM CDT (01:17 UTC)
- Expired
- Apr 18, 2002, 8:50 PM CDT
- In force
- 33 min
- Issued by
- NWS Quad Cities, IA
- Area
- Counties, with a storm outline in the text
County Linn County, IA
The radar
The Quad Cities radar (KDVN), 109 km from the middle of the area, began a volume at 01:18 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.3 hours before the alert went out and 114 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 KDVN 190117 SVRMLI IAC113-190150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 815 PM CDT THU APR 18 2002 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LINN COUNTY IN EAST CENTRAL IOWA * UNTIL 850 PM CDT * AT 810 PM CDT...LOCAL LAW ENFORCEMENT REPORTED A SEVERE THUNDERSTORM WITH 50 TO 60 MPH WINDS 2 MILES SOUTH OF WALKER...OR 17 MILES NORTH OF CEDAR RAPIDS...MOVING EAST AT 50 MPH. * THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR... CENTRAL CITY BY 820 PM CDT. WAUBEEK BY 825 PM CDT. 6 MILES NORTH OF VIOLA BY 830 PM CDT. THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO 1 INCH IN DIAMETER AND WINDS IN EXCESS OF 60 MPH. TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES. LAT...LON 4229 9183 4208 9183 4198 9139 4228 9139 REA &
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 7:51 PM CDT | Severe Thunderstorm Warning | DVN | Benton | 34 min |
| Apr 18, 7:55 PM CDT | Tornado Warning | DVN | Benton | 35 min |
| Apr 18, 8:09 PM CDT | Tornado Warning | DVN | Buchanan | 36 min |
| Apr 18, 8:27 PM CDT | Tornado Warning | DVN | Iowa | 48 min |
| Apr 18, 8:35 PM CDT | Tornado Warning | DVN | Jones, Linn | 35 min |
| Apr 18, 8:44 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 31 min |
| Apr 18, 8:59 PM CDT | Tornado Warning | DVN | Johnson | 46 min |
| Apr 18, 9:16 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 44 min |
| Apr 18, 9:28 PM CDT | Tornado Warning | DVN | Cedar | 32 min |
| Apr 18, 9:30 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jones | 45 min |
| Apr 18, 9:50 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 40 min |
| Apr 18, 9:59 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.