Alert archive / Iowa / Tornado Warnings in 2003

Tornado Warning 25, NWS Quad Cities, IA

May 10, 2003Henry County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 10, 2003, 7:40 PM CDT for Henry County, Iowa. It was in force for 35 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: May 10, 2003, 7:40 PM CDT (00:40 UTC)
Expired: May 10, 2003, 8:15 PM CDT
In force: 35 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Henry County, IA

The radar

The Quad Cities radar (KDVN), 109 km from the middle of the area, began a volume at 00:44 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 10, 3:50 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 115 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: 1566 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 12.7

Open this sounding in Storm Lab

The text

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

989 
WFUS53 KDVN 110040
TORDVN
IAC087-110115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
739 PM CDT SAT MAY 10 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  HENRY COUNTY IN SOUTHEAST IOWA

* UNTIL 815 PM CDT

* AT 733 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A LIKELY TORNADO 5 MILES SOUTH OF ROME...
  OR 9 MILES WEST OF MOUNT PLEASANT...MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
   OAKLAND MILLS BY 740 PM CDT.
   MOUNT PLEASANT MUNICIPAL AIRPORT BY 745 PM CDT.
   NEW LONDON BY 755 PM CDT.
  6 MILES SOUTH OF MOUNT UNION BY 800 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 TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING
FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST MISSOURI. A
TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM CDT SATURDAY
EVENING FOR WEST CENTRAL ILLINOIS AND NORTHEAST MISSOURI.

LAT...LON 4101 9170 4084 9168 4088 9138 4111 9140

$$

NICHOLS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:08 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	37 min
May 10, 8:03 PM CDT	Tornado Warning	DVN	Louisa	27 min
May 10, 8:29 PM CDT	Tornado Warning	DVN	Louisa	46 min
May 10, 9:13 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	47 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; radar from the NEXRAD Level II archive.