Alert archive / Iowa / Tornado Warnings in 2003

Tornado Warning 7, NWS Quad Cities, IA

April 30, 2003Louisa County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 30, 2003, 6:31 PM CDT for Louisa County, Iowa. It was in force for 44 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: Apr 30, 2003, 6:31 PM CDT (23:31 UTC)
Expired: Apr 30, 2003, 7:15 PM CDT
In force: 44 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Louisa County, IA

The radar

The Quad Cities radar (KDVN), 71 km from the middle of the area, began a volume at 23:32 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
Apr 30, 5:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 77 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 849 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 478 m²/s²
0-3 km storm-relative helicity: 567 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

324 
WFUS53 KDVN 302331
TORDVN
IAC115-010015-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
627 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN LOUISA COUNTY IN SOUTHEAST IOWA

* UNTIL 715 PM CDT

* AT 622 PM CDT...DOPPLER RADAR AND SPOTTERS INDICATED A DEVELOPING 
  TORNADO NEAR YARMOUTH IN FAR NORTHWEST DES MOINES COUNTY...OR ABOUT
  15 MILES SOUTHWEST OF WAPELLO...MOVING EAST-NORTHEAST AT 25 MPH.
  THIS REPLACES THE TORNADO WARNING THAT WAS TO EXPIRE AT 630 PM CDT.

* THE TORNADO IS EXPECTED TO BE NEAR...
   MORNING SUN BY 630 PM CDT.
   NEWPORT BY 635 PM CDT.
   ELRICK JUNCTION BY 640 PM CDT.
   OAKVILLE BY 645 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. IN 
ADDITION...THIS STORM WILL BE CAPABLE OF PRODUCING HAIL GOLFBALL 
SIZE AND LARGER. 

LAT...LON 4124 9145 4109 9130 4110 9097 4122 9109
          4132 9113

$$

SHEETS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 9:49 AM CDT	Severe Thunderstorm Warning	DVN	Linn	26 min
Apr 30, 10:18 AM CDT	Severe Thunderstorm Warning	DVN	Jones	42 min
Apr 30, 1:09 PM CDT	Severe Thunderstorm Warning	DVN	Scott	36 min
Apr 30, 1:11 PM CDT	Severe Thunderstorm Warning	DVN	Scott	34 min
Apr 30, 1:28 PM CDT	Severe Thunderstorm Warning	DVN	Lee	47 min
Apr 30, 5:02 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	43 min
Apr 30, 5:09 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Washington	51 min
Apr 30, 5:27 PM CDT	Tornado Warning	DVN	Henry, Louisa	33 min
Apr 30, 5:46 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson	29 min
Apr 30, 5:56 PM CDT	Tornado Warning	DVN	Louisa	64 min
Apr 30, 6:01 PM CDT	Tornado Warning	DVN	Louisa	29 min
Apr 30, 6:10 PM CDT	Tornado Warning	DVN	Henry	35 min
Apr 30, 6:19 PM CDT	Tornado Warning	DVN	Des Moines	56 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.