Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 43, NWS Quad Cities, IA

August 26, 2004Linn County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 26, 2004, 10:14 PM CDT for Linn County, Iowa. It was in force for 46 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: Aug 26, 2004, 10:14 PM CDT (03:14 UTC)
Expired: Aug 26, 2004, 11:00 PM CDT
In force: 46 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Linn County, IA

The radar

The Quad Cities radar (KDVN), 99 km from the middle of the area, began a volume at 03:14 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
Aug 26, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.2 hours before the alert went out and 105 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: 3587 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 18.5

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 270314
TORDVN
IAC113-270400-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1014 PM CDT THU AUG 26 2004

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  LINN COUNTY IN EAST CENTRAL IOWA

* UNTIL 1100 PM CDT

* AT 1008 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 5 MILES SOUTH OF PALO...OR ABOUT 8 MILES WEST OF CEDAR
  RAPIDS...MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CEDAR RAPIDS AND MARION BY 1020 PM CDT
  BERTRAM BY 1025 PM CDT
  6 MILES SOUTH OF SPRINGVILLE BY 1030 PM CDT
  MOUNT VERNON...LISBON AND 8 MILES SOUTH OF VIOLA BY 1035 PM CDT

THE SAFEST PLACE TO BE IN A TORNADO IS IN A BASEMENT OR INTERIOR ROOM
OR HALLWAY ON THE LOWEST FLOOR OF A BUILDING.

TORNADOES AT NIGHT ARE DIFFICULT TO SEE AND ARE ESPECIALLY DANGEROUS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT FRIDAY
MORNING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4209 9184 4191 9184 4185 9138 4208 9137

$$

DLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 9:31 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Iowa	44 min
Aug 26, 10:08 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Linn	52 min
Aug 26, 10:41 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	64 min
Aug 26, 10:47 PM CDT	Tornado Warning	DVN	Jones	43 min
Aug 26, 11:00 PM CDT	Tornado Warning	DVN	Delaware, Dubuque	45 min
Aug 26, 11:06 PM CDT	Severe Thunderstorm Warning	DVN	Iowa	54 min
Aug 26, 11:16 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	59 min
Aug 26, 11:22 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	53 min
Aug 26, 11:34 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	56 min
Aug 26, 11:47 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	58 min
Aug 27, 1:25 AM CDT	Flash Flood Warning	DVN	Lee, Van Buren	9 hr

Nearby

Tornado Warnings in Iowa, 2004 Every tornado warning in 2004 Tornadoes in 2004

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.