Alert archive / Iowa / Tornado Warnings in 2003

Tornado Warning 45, NWS Quad Cities, IA

July 20, 2003Jones County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jul 20, 2003, 11:35 PM CDT for Jones County, Iowa. It was in force for 25 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, 11:35 PM CDT (04:35 UTC)
Expired: Jul 21, 2003, 12:00 AM CDT
In force: 25 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County 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, 4.6 hours before the alert went out and 71 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.

825 
WFUS53 KDVN 210435
TORDVN
IAC105-210500-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1132 PM CDT SUN JUL 20 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

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

* UNTIL MIDNIGHT CDT

* AT 1122 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A POSSIBLE TORNADO NEAR OLIN...MOVING 
  SOUTHEAST AT 35 MPH.

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 4217 9091 4215 9135 4196 9136 4196 9091

$$

LRE

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, 11:07 PM CDT	Tornado Warning	DVN	Cedar, Jones	23 min
Jul 20, 11:29 PM CDT	Tornado Warning	DVN	Cedar, Linn	31 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.