Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 8, NWS Quad Cities, IA

May 21, 2004Benton County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 21, 2004, 4:14 PM CDT for Benton County, Iowa. It was in force for 31 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 21, 2004, 4:14 PM CDT (21:14 UTC)
Expired: May 21, 2004, 4:45 PM CDT
In force: 31 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Benton County, IA

The radar

The Quad Cities radar (KDVN), 135 km from the middle of the area, began a volume at 21:14 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
May 21, 2:45 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.2 hours before the alert went out and 326 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: 732 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 216 m²/s²
0-3 km storm-relative helicity: 321 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.

601 
WFUS53 KDVN 212114
TORDVN
IAC011-212145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
413 PM CDT FRI MAY 21 2004

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

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

* UNTIL 445 PM CDT

* AT 408 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM PRODUCING A TORNADO NEAR ATKINS...OR ABOUT 10  
  MILES WEST OF CEDAR RAPIDS...MOVING EAST AT 35 MPH. A SECOND
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO WAS LOCATED NEAR
  MOUNT AUBURN

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

THIS STORM HAS ALREADY PRODUCED A TORNADO AND REMAINS A THREAT.

LAT...LON 4229 9221 4191 9215 4191 9185 4229 9186

$$

MCCLURE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:13 PM CDT	Severe Thunderstorm Warning	DVN	Johnson, Washington	62 min
May 20, 7:41 PM CDT	Severe Thunderstorm Warning	DVN	Louisa	64 min
May 20, 7:54 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	66 min
May 21, 6:28 AM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware	62 min
May 21, 3:26 PM CDT	Tornado Warning	DVN	Buchanan	64 min
May 21, 3:27 PM CDT	Severe Thunderstorm Warning	DVN	Benton	48 min
May 21, 3:38 PM CDT	Tornado Warning	DVN	Benton	37 min
May 21, 4:12 PM CDT	Tornado Warning	DVN	Linn	63 min
May 21, 4:43 PM CDT	Flash Flood Warning	DVN	Benton, Buchanan, Delaware, Linn	6 hr
May 21, 4:44 PM CDT	Severe Thunderstorm Warning	DVN	Benton	61 min
May 21, 4:48 PM CDT	Tornado Warning	DVN	Benton	57 min
May 21, 4:51 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	54 min
May 21, 5:05 PM CDT	Tornado Warning	DVN	Jones	55 min
May 21, 5:21 PM CDT	Severe Thunderstorm Warning	DVN	Linn	54 min
May 21, 5:38 PM CDT	Tornado Warning	DVN	Clinton, Jackson	67 min
May 21, 5:51 PM CDT	Flash Flood Warning	DVN	Jones	6 hr
May 21, 5:56 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Jones	64 min

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.