Alert archive / Iowa / Tornado Warnings in 2002
Tornado Warning 18, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at Aug 21, 2002, 6:39 PM CDT for Scott County, Iowa. It was in force for 66 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
- Aug 21, 2002, 6:39 PM CDT (23:39 UTC)
- Expired
- Aug 21, 2002, 7:45 PM CDT
- In force
- 66 min
- Issued by
- NWS Quad Cities, IA
- Area
- Counties, with a storm outline in the text
County Scott County, IA
The radar
The Quad Cities radar (KDVN), 8 km from the middle of the area, began a volume at 23:41 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 |
|---|---|---|---|
| Aug 21, 7:00 PM CDT | Tornado F0 | Blue Grass, IA | An F0 tornado touched down briefly north of Blue Grass tearing down a large tree limb. Otherwise, no injuries or damage was reported. |
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 |
|---|---|---|---|
| Aug 21, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.7 hours before the alert went out and 15 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
- 1748 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 760 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 173 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
314 WFUS53 KDVN 212339 TORMLI IAC163-220045- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 639 PM CDT WED AUG 21 2002 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * TORNADO WARNING FOR... SOUTHERN SCOTT COUNTY IN EAST CENTRAL IOWA * UNTIL 745 PM CDT * AT 636 PM CDT...DOPPLER RADAR AND SPOTTERS INDICATED A TORNADO 4 MILES WEST OF BLUE GRASS...MOVING EAST AT 20 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... BLUE GRASS BY 645 PM CDT. DAVENPORT BY 710 PM CDT. ELDRIDGE BY 720 PM CDT. BETTENDORF BY 725 PM CDT. THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT OR ON THE LOWEST FLOOR OF A BUILDING IN AN INTERIOR HALLWAY OR ROOM. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT WEDNESDAY EVENING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS. LAT...LON 4160 9077 4146 9078 4154 9047 4166 9053 $$ 86
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:35 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Washington | 40 min |
| Aug 21, 4:53 PM CDT | Severe Thunderstorm Warning | DVN | Cedar | 52 min |
| Aug 21, 5:27 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 33 min |
| Aug 21, 6:03 PM CDT | Severe Thunderstorm Warning | DVN | Muscatine | 42 min |
| Aug 21, 6:05 PM CDT | Severe Thunderstorm Warning | DVN | Muscatine | 40 min |
| Aug 21, 6:13 PM CDT | Tornado Warning | DVN | Muscatine | 32 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.