Alert archive / Iowa / Tornado Warnings in 2002

Tornado Warning 17, NWS Quad Cities, IA

August 21, 2002Muscatine County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 21, 2002, 6:13 PM CDT for Muscatine County, Iowa. It was in force for 32 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, 6:13 PM CDT (23:13 UTC)
Expired: Aug 21, 2002, 6:45 PM CDT
In force: 32 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Muscatine County, IA

The radar

The Quad Cities radar (KDVN), 35 km from the middle of the area, began a volume at 23:16 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, 6:15 PM CDT	Tornado F1	Muscatine, IA	An F1 tornado touched down north of Muscatine near Highway 38 doing extensive damage to a machine shed that housed a tractor, disk, planter and field cultivator. Damage to the shed and equipment was estimated at over $200,000. Nearby, the roof was partially

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, 11.2 hours before the alert went out and 41 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: 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

Open this sounding in Storm Lab

The text

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

331 
WFUS53 KDVN 212313
TORMLI
IAC139-212345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
613 PM CDT WED AUG 21 2002

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN MUSCATINE COUNTY IN EAST CENTRAL IOWA

* UNTIL 645 PM CDT

* AT 611 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A DEVELOPING TORNADO 13 MILES SOUTHWEST OF
  STOCKTON...OR 4 MILES NORTH OF MUSCATINE...MOVING EAST AT 35 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
   STOCKTON BY 630 PM CDT.

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS ALREADY IN EFFECT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT
WEDNESDAY EVENING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS.

LAT...LON 4156 9111 4142 9107 4148 9080 4160 9082

$$
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, 6:39 PM CDT	Tornado Warning	DVN	Scott	66 min

Nearby

Tornado Warnings in Iowa, 2002 Every tornado warning in 2002 Tornadoes 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.