Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 84, NWS Des Moines, IA

June 11, 2004Boone County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 11, 2004, 8:59 PM CDT for Boone County, Iowa. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 11, 2004, 8:59 PM CDT (01:59 UTC)
Expired: Jun 11, 2004, 9:45 PM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Boone County, IA

The radar

The Des Moines radar (KDMX), 40 km from the middle of the area, began a volume at 02:00 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.

What was reported inside it

Time	Report	Where	Remark
Jun 11, 9:01 PM CDT	TORNADO	3 N Boone, IA	20 SECOND TOUCHDOWN. REPORTED BY UNIV. OF NRN ILLINOIS TEAM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 228 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: 4 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 2604 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 34 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.

724 
WFUS53 KDMX 120159
TORDMX
IAC015-120245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
859 PM CDT FRI JUN 11 2004

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN BOONE COUNTY IN CENTRAL IOWA

* UNTIL 945 PM CDT

* AT 855 PM...RADAR INDICATED A THUNDERSTORM WITH A HISTORY OF
  TORNADOES 3 MILES NORTH OF BOONE...OR ABOUT 32 MILES SOUTHEAST OF
  FORT DODGE...MOVING EAST AT 20 MPH.

* THE STORM WILL BE...
  IN RURAL AREAS NORTHEAST OF BOONE.

THIS REPLACES THE PRIOR TORNADO WARNING FOR NORTHERN BOONE COUNTY.

THIS IS A HAZARDOUS SITUATION. SEEK SHELTER IN A BASEMENT...OR IN AN
INTERIOR ROOM. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE OR IN A
CAR...SEEK SHELTER IN A REINFORCED BUILDING.

LAT...LON 4220 9390 4189 9391 4193 9371 4220 9371

$$

COGIL

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 7:07 PM CDT	Severe Thunderstorm Warning	DMX	Wright	53 min
Jun 11, 7:13 PM CDT	Severe Thunderstorm Warning	DMX	Taylor	47 min
Jun 11, 7:18 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	57 min
Jun 11, 7:28 PM CDT	Tornado Warning	DMX	Webster	32 min
Jun 11, 7:49 PM CDT	Tornado Warning	DMX	Hamilton	56 min
Jun 11, 7:59 PM CDT	Severe Thunderstorm Warning	DMX	Union	61 min
Jun 11, 8:02 PM CDT	Tornado Warning	DMX	Webster	28 min
Jun 11, 8:13 PM CDT	Tornado Warning	DMX	Boone	47 min
Jun 11, 8:21 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	54 min
Jun 11, 8:30 PM CDT	Tornado Warning	DMX	Webster	15 min
Jun 11, 8:42 PM CDT	Flash Flood Warning	DMX	Hamilton	3 hr
Jun 11, 8:47 PM CDT	Tornado Warning	DMX	Hamilton	43 min
Jun 11, 9:01 PM CDT	Severe Thunderstorm Warning	DMX	Dallas	44 min
Jun 11, 9:17 PM CDT	Severe Thunderstorm Warning	DMX	Story	58 min
Jun 11, 9:34 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	41 min
Jun 11, 10:11 PM CDT	Severe Thunderstorm Warning	DMX	Marshall, Story	59 min
Jun 12, 2:11 PM CDT	Severe Thunderstorm Warning	DMX	Cass	34 min
Jun 12, 2:20 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	40 min
Jun 12, 2:54 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	36 min
Jun 12, 2:57 PM CDT	Severe Thunderstorm Warning	DMX	Adair	33 min
Jun 12, 3:18 PM CDT	Severe Thunderstorm Warning	DMX	Union	42 min
Jun 12, 3:32 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas	43 min
Jun 12, 3:46 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Story	44 min
Jun 12, 4:19 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	41 min
Jun 12, 4:27 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall	48 min
Jun 12, 5:01 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.