Alert archive / Iowa / Tornado Warnings in 2003

Tornado Warning 43, NWS Quad Cities, IA

July 20, 2003Cedar County, Jones County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jul 20, 2003, 11:07 PM CDT for Cedar County, Jones County, Iowa. It was in force for 23 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: Jul 20, 2003, 11:07 PM CDT (04:07 UTC)
Expired: Jul 20, 2003, 11:30 PM CDT
In force: 23 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

Counties Cedar County, IA, Jones County, IA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 8:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.1 hours before the alert went out and 69 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: 3041 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1003 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 210407
TORDVN
IAC031-105-210430-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1106 PM CDT SUN JUL 20 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN CEDAR COUNTY IN EAST CENTRAL IOWA
  SOUTHERN JONES COUNTY IN EAST CENTRAL IOWA

* UNTIL 1130 PM CDT

* AT 1102 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A TORNADO OVER MORLEY...OR 6 MILES   
  SOUTH OF ANAMOSA...MOVING SOUTHEAST AT 25 MPH.  SPOTTERS HAVE 
  REPORTED A TORNADO ON THE GROUND WITH THIS THUNDERSTORM.

* THE TORNADO IS EXPECTED TO BE NEAR...
   OLIN BY 1115 PM CDT.
   HALE BY 1120 PM CDT.
  8 MILES SOUTHWEST OF WYOMING BY 1125 PM CDT.
   CLARENCE BY 1130 PM CDT.

NIGHTTIME TORNADOES ARE ESPECIALLY DANGEROUS BECAUSE THEY ARE
DIFFICULT TO SEE. TAKE COVER NOW

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT MONDAY MORNING FOR
EASTERN IOWA AND NORTHWEST ILLINOIS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT MONDAY
MORNING FOR NORTHWESTERN ILLINOIS.

LAT...LON 4214 9128 4198 9139 4175 9093 4203 9090

$$

DLF

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 9:59 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	31 min
Jul 20, 10:27 PM CDT	Tornado Warning	DVN	Benton, Buchanan, Linn	33 min
Jul 20, 10:58 PM CDT	Tornado Warning	DVN	Linn	32 min
Jul 20, 11:29 PM CDT	Tornado Warning	DVN	Cedar, Linn	31 min
Jul 20, 11:35 PM CDT	Tornado Warning	DVN	Jones	25 min
Jul 20, 11:43 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Keokuk, Washington	47 min
Jul 20, 11:58 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Muscatine	32 min
Jul 21, 12:17 AM CDT	Severe Thunderstorm Warning	DVN	Scott	43 min
Jul 21, 12:30 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Louisa, Washington	45 min

Nearby

Tornado Warnings in Iowa, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.