Alert archive / Iowa / Tornado Warnings in 2002
Tornado Warning 21, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at Sep 18, 2002, 2:29 PM CDT for Clinton County, Jackson County, Iowa. It was in force for 46 min. 8 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 18, 2002, 2:29 PM CDT (19:29 UTC)
- Expired
- Sep 18, 2002, 3:15 PM CDT
- In force
- 46 min
- Issued by
- NWS Quad Cities, IA
- Area
- Counties, with a storm outline in the text
Counties Clinton County, IA, Jackson County, IA
The radar
The Quad Cities radar (KDVN), 47 km from the middle of the area, began a volume at 19:28 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 |
|---|---|---|---|
| Sep 18, 2:40 PM CDT | Hail 2.75 | Maquoketa, IA | |
| Sep 18, 2:40 PM CDT | Thunderstorm Wind 61 E | Maquoketa, IA | |
| Sep 18, 2:42 PM CDT | Thunderstorm Wind 70 E | Baldwin, IA | |
| Sep 18, 2:42 PM CDT | Hail 2.5 | Baldwin, IA | |
| Sep 18, 2:51 PM CDT | Hail 2.75 | Maquoketa, IA | |
| Sep 18, 2:51 PM CDT | Hail 1 | Maquoketa, IA | |
| Sep 18, 3:20 PM CDT | Thunderstorm Wind 61 E | Goose Lake, IA | |
| Sep 18, 3:20 PM CDT | Hail 1 | Goose Lake, 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 12:00Z, 7.5 hours before the alert went out and 46 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
- 82 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 783 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 1:55 PM CDT | Severe Thunderstorm Warning | DVN | Jones | 50 min |
| Sep 18, 2:09 PM CDT | Tornado Warning | DVN | Jones | 36 min |
| Sep 18, 3:17 PM CDT | Severe Thunderstorm Warning | DVN | Clinton | 43 min |
| Sep 18, 3:38 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Whiteside | 52 min |
Nearby
Tornado Warnings in Iowa, 2002Every tornado warning in 2002Tornadoes 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.