Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 22, NWS Des Moines, IA

May 25, 2008Poweshiek County, Iowa

NWS Des Moines, IA issued this tornado warning at May 25, 2008, 10:52 PM CDT for Poweshiek County, Iowa. It was in force for 23 min. 3 reports 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: May 25, 2008, 10:52 PM CDT (03:52 UTC)
Expired: May 25, 2008, 11:15 PM CDT
In force: 23 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

County Poweshiek County, IA

What was reported inside it

Time	Report	Where
May 25, 10:53 PM CDT	TSTM WND GST 59	1 N Montezuma, IA
May 25, 10:57 PM CDT	TSTM WND GST 59	Brooklyn, IA
May 25, 11:00 PM CDT	TSTM WND GST 58	Montezuma, IA

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

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 25, 7:54 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.9 hours before the alert went out and 155 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: 1867 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 260352
TORDMX
IAC157-260415-
/O.NEW.KDMX.TO.W.0022.080526T0352Z-080526T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1052 PM CDT SUN MAY 25 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN POWESHIEK COUNTY IN CENTRAL IOWA...

* UNTIL 1115 PM CDT.

* AT 1048 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR MALCOM...OR
  26 MILES SOUTHWEST OF MARENGO...MOVING EAST AT 66 MPH.

* THE TORNADO WILL BE NEAR...
  GUERNSEY...BROOKLYN AND DEEP RIVER BY 1055 PM CDT...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY MORNING FOR
IOWA.

LAT...LON 4151 9230 4151 9259 4173 9260 4176 9229
      4175 9229 4161 9229 4160 9229
TIME...MOT...LOC 0352Z 263DEG 57KT 4166 9245

$$

JUNGBLUTH

2 follow-up statements

000 
WWUS53 KDMX 260401
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1101 PM CDT SUN MAY 25 2008

IAC157-260415-
/O.CON.KDMX.TO.W.0022.000000T0000Z-080526T0415Z/
POWESHIEK IA-
1101 PM CDT SUN MAY 25 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT FOR
SOUTHEASTERN POWESHIEK COUNTY...

AT 1057 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR GUERNSEY...OR 19
MILES SOUTHWEST OF MARENGO...MOVING EAST AT 53 MPH.

IN ADDITION TO THE TORNADO THREAT...WIDESPREAD STRAIGHT LINE WINDS 
OF 60 TO 70 MPH WILL AFFECT THE WARNING AREA. SEEK SHELTER IN A 
BASEMENT...OR IN AN INTERIOR ROOM. STAY AWAY FROM WINDOWS. IF YOU 
ARE IN A CAR OR OUTSIDE...SEEK SHELTER IN A REINFORCED BUILDING.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY MORNING FOR
IOWA.

LAT...LON 4151 9230 4151 9259 4173 9260 4176 9229
      4175 9229 4161 9229 4160 9229
TIME...MOT...LOC 0401Z 264DEG 46KT 4166 9232

$$

JUNGBLUTH

000 
WWUS53 KDMX 260413
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1112 PM CDT SUN MAY 25 2008

IAC157-260422-
/O.EXP.KDMX.TO.W.0022.000000T0000Z-080526T0415Z/
POWESHIEK IA-
1112 PM CDT SUN MAY 25 2008

...THE TORNADO WARNING FOR SOUTHEASTERN POWESHIEK COUNTY WILL EXPIRE
AT 1115 PM CDT...

AT 1109 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
TORNADO THREAT WHICH PROMPTED THE WARNING HAS DIMINISHED...AND NO 
LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. 
THEREFORE...THE TORNADO WARNING WILL BE ALLOWED TO EXPIRE.

HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THIS 
AREA...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY 
MORNING FOR IOWA.

LAT...LON 4151 9230 4151 9259 4173 9260 4176 9229
      4175 9229 4161 9229 4160 9229
TIME...MOT...LOC 0412Z 264DEG 46KT 4168 9230

$$

JUNGBLUTH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 7:14 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	46 min
May 25, 7:15 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Greene, Guthrie	45 min
May 25, 7:19 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	26 min
May 25, 7:38 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene, Story	52 min
May 25, 7:44 PM CDT	Tornado Warning	DMX	Guthrie	46 min
May 25, 7:50 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	40 min
May 25, 7:57 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Hardin	63 min
May 25, 8:02 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas	43 min
May 25, 8:05 PM CDT	Severe Thunderstorm Warning	DMX	Polk	40 min
May 25, 8:11 PM CDT	Severe Thunderstorm Warning	DMX	Dallas	19 min
May 25, 8:16 PM CDT	Tornado Warning	DMX	Grundy, Hardin, Marshall, Story	44 min
May 25, 8:27 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Butler, Grundy	33 min
May 25, 8:29 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Taylor, Union	46 min
May 25, 8:44 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Ringgold, Taylor	46 min
May 25, 8:46 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Polk, Story	44 min
May 25, 8:54 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Jasper, Madison, Polk, Warren	51 min
May 25, 8:58 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Tama	47 min
May 25, 9:01 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	44 min
May 25, 9:09 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Clarke, Madison, Union, Warren	51 min
May 25, 9:21 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Madison, Polk	39 min
May 25, 9:25 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Guthrie, Polk	50 min
May 25, 9:29 PM CDT	Severe Thunderstorm Warning	DMX	Tama	46 min
May 25, 9:31 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Ringgold	44 min
May 25, 9:31 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Polk	44 min
May 25, 9:42 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	48 min
May 25, 9:59 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Jasper, Polk, Story	46 min
May 25, 10:03 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion	42 min
May 25, 10:12 PM CDT	Severe Thunderstorm Warning	DMX	Tama	48 min
May 25, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Wayne	45 min
May 25, 10:20 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene, Hamilton, Hardin, Story, Webster	40 min
May 25, 10:21 PM CDT	Flash Flood Warning	DMX	Tama	113 min
May 25, 10:35 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	40 min
May 25, 10:43 PM CDT	Severe Thunderstorm Warning	DMX	Marshall, Story	36 min
May 25, 10:48 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis	42 min
May 25, 11:00 PM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	45 min

Nearby

Tornado Warnings in Iowa, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.