Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 29, NWS Des Moines, IA

May 29, 2008Dallas County, Iowa

NWS Des Moines, IA issued this tornado warning at May 29, 2008, 10:55 PM CDT for Dallas County, Iowa. It was in force for 35 min. 2 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 29, 2008, 10:55 PM CDT (03:55 UTC)
Expired: May 29, 2008, 11:30 PM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

County Dallas County, IA

The radar

The Des Moines radar (KDMX), 31 km from the middle of the area, began a volume at 03:55 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
May 29, 11:06 PM CDT	TORNADO	2 W Minburn, IA	BRIEF TORNADO TOUCHDOWN. DAMAGE UNKNOWN.
May 29, 11:06 PM CDT	TORNADO	2 W Minburn, IA	EF0 TORNADO START AND END POINT

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 29, 8:13 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.9 hours before the alert went out and 197 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: 3876 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 6.4
Supercell composite: 26.8

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 300354
TORDMX
IAC049-300430-
/O.NEW.KDMX.TO.W.0029.080530T0355Z-080530T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1055 PM CDT THU MAY 29 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN DALLAS COUNTY IN CENTRAL IOWA...

* UNTIL 1130 PM CDT.

* AT 1050 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 11 MILES SOUTH
  OF DAWSON...OR 36 MILES WEST OF DES MOINES...MOVING EAST AT 43 MPH.

* THE TORNADO WILL BE NEAR...
  MINBURN...PERRY AND DALLAS CENTER BY 1110 PM CDT...
  BOUTON BY 1115 PM CDT...
  WOODWARD BY 1120 PM CDT...
  GRANGER BY 1125 PM CDT...

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 4186 9429 4186 9405 4186 9404 4186 9382
      4165 9382 4165 9429
TIME...MOT...LOC 0355Z 248DEG 37KT 4172 9423

$$

COGIL

2 follow-up statements

000 
WWUS53 KDMX 300405
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1106 PM CDT THU MAY 29 2008

IAC049-300430-
/O.CON.KDMX.TO.W.0029.000000T0000Z-080530T0430Z/
DALLAS IA-
1106 PM CDT THU MAY 29 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT FOR NORTHERN
DALLAS COUNTY...

AT 1104 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR MINBURN...OR 29
MILES NORTHWEST OF DES MOINES...MOVING EAST AT 40 MPH.

THE TORNADO WILL BE NEAR...
  6 MILES NORTH OF DALLAS CENTER AND 6 MILES SOUTH OF BOUTON BY 1115
  PM CDT...
  WOODWARD BY 1120 PM CDT...
  GRANGER BY 1125 PM CDT...

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 FRIDAY MORNING FOR
SOUTHWESTERN IOWA.

LAT...LON 4186 9421 4186 9405 4186 9404 4186 9382
      4165 9382 4165 9421
TIME...MOT...LOC 0406Z 255DEG 35KT 4175 9410

$$

000 
WWUS53 KDMX 300432
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1132 PM CDT THU MAY 29 2008

IAC049-300442-
/O.EXP.KDMX.TO.W.0029.000000T0000Z-080530T0430Z/
DALLAS IA-
1132 PM CDT THU MAY 29 2008

...THE TORNADO WARNING FOR NORTHERN DALLAS COUNTY HAS EXPIRED...

AT 1128 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED...AND NO
LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. THEREFORE...THE
TORNADO WARNING WILL BE ALLOWED TO EXPIRE.

REPORT TORNADOES...WIND IN EXCESS OF 50 MPH...HAIL LARGER THAN ONE
HALF INCH...OR STORM DAMAGE BY CALLING LOCAL LAW ENFORCEMENT AND
ASKING THEM TO RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE.

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

LAT...LON 4186 9421 4186 9405 4186 9404 4186 9382
      4165 9382 4165 9421
TIME...MOT...LOC 0405Z 255DEG 35KT 4175 9411

$$

COGIL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 8:16 PM CDT	Severe Thunderstorm Warning	DMX	Sac	44 min
May 29, 8:29 PM CDT	Tornado Warning	DMX	Crawford	31 min
May 29, 8:43 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas	32 min
May 29, 8:56 PM CDT	River Flood Warning	DMX	Dallas	20 days
May 29, 8:56 PM CDT	River Flood Warning	DMX	Boone, Webster	23 days
May 29, 8:56 PM CDT	Tornado Warning	DMX	Calhoun, Carroll	34 min
May 29, 9:09 PM CDT	Tornado Warning	DMX	Carroll	27 min
May 29, 9:23 PM CDT	Tornado Warning	DMX	Greene	31 min
May 29, 9:24 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Greene, Webster	51 min
May 29, 9:30 PM CDT	Tornado Warning	DMX	Webster	30 min
May 29, 9:51 PM CDT	Tornado Warning	DMX	Wright	27 min
May 29, 10:02 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Hardin	43 min
May 29, 10:06 PM CDT	River Flood Warning	DMX	Story	41 hr
May 29, 10:06 PM CDT	River Flood Warning	DMX	Polk, Story	66 hr
May 29, 10:06 PM CDT	River Flood Warning	DMX	Mahaska	27 days
May 29, 10:24 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	39 min
May 29, 10:34 PM CDT	Flash Flood Warning	DMX	Crawford	6 hr
May 29, 11:07 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford	53 min
May 29, 11:30 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Guthrie	45 min
May 29, 11:36 PM CDT	Severe Thunderstorm Warning	DMX	Wright	23 min
May 29, 11:48 PM CDT	Flash Flood Warning	DMX	Calhoun, Carroll, Greene, Sac	6 hr
May 29, 11:50 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene	40 min
May 29, 11:56 PM CDT	Tornado Warning	DMX	Audubon, Guthrie	34 min
May 30, 12:19 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie	29 min
May 30, 12:23 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Story	37 min
May 30, 12:27 AM CDT	Flash Flood Warning	DMX	Boone, Calhoun, Greene, Hamilton, Hardin, Story and 1 more	6 hr
May 30, 12:27 AM CDT	Tornado Warning	DMX	Jasper, Marshall	33 min
May 30, 12:41 AM CDT	Tornado Warning	DMX	Tama	34 min
May 30, 12:46 AM CDT	Tornado Warning	DMX	Dallas	31 min
May 30, 1:04 AM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	41 min
May 30, 1:14 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	46 min
May 30, 1:41 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Clarke, Dallas, Guthrie, Madison and 2 more	49 min
May 30, 1:50 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union, Warren	40 min
May 30, 1:53 AM CDT	Flash Flood Warning	DMX	Black Hawk, Grundy, Hardin, Marshall, Tama	6 hr
May 30, 2:01 AM CDT	Flash Flood Warning	DMX	Audubon, Dallas, Guthrie	6 hr
May 30, 4:05 AM CDT	Tornado Warning	DMX	Clarke, Union	40 min
May 30, 4:25 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	50 min
May 30, 4:40 AM CDT	Tornado Warning	DMX	Clarke, Lucas, Warren	19 min
May 30, 4:57 AM CDT	River Flood Warning	DMX	Jasper	18 days
May 30, 5:01 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	44 min
May 30, 5:18 AM CDT	Tornado Warning	DMX	Mahaska, Marion	42 min
May 30, 5:37 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska	23 min
May 30, 5:56 AM CDT	Areal Flood Warning	DMX	Carroll, Crawford, Greene	8 hr
May 30, 6:29 AM CDT	Areal Flood Warning	DMX	Boone, Calhoun, Greene, Hamilton, Hardin, Story and 1 more	6 hr
May 30, 6:32 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Wayne	43 min
May 30, 6:51 AM CDT	Areal Flood Warning	DMX	Black Hawk, Grundy, Hardin, Marshall, Tama	12 hr
May 30, 7:41 AM CDT	River Flood Warning	DMX	Marshall	58 hr
May 30, 7:52 AM CDT	Areal Flood Warning	DMX	Audubon, Dallas, Guthrie	5 hr
May 30, 8:53 AM CDT	River Flood Warning	DMX	Story	31 hr
May 30, 9:38 AM CDT	River Flood Warning	DMX	Polk	25 days
May 30, 9:38 AM CDT	River Flood Warning	DMX	Dallas, Polk	3 days
May 30, 9:38 AM CDT	River Flood Warning	DMX	Polk	20 days
May 30, 9:38 AM CDT	River Flood Warning	DMX	Polk	20 days
May 30, 9:38 AM CDT	River Flood Warning	DMX	Humboldt	12 hr
May 30, 9:38 AM CDT	River Flood Warning	DMX	Polk	4 days
May 30, 12:30 PM CDT	Areal Flood Warning	DMX	Boone, Story	11 hr
May 30, 12:53 PM CDT	Areal Flood Warning	DMX	Webster	6 hr
May 30, 12:57 PM CDT	River Flood Warning	DMX	Cerro Gordo, Floyd, Worth	9 hr
May 30, 2:09 PM CDT	Areal Flood Warning	DMX	Greene	6 hr
May 30, 3:34 PM CDT	River Flood Warning	DMX	Black Hawk, Butler	53 hr

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; radar from the NEXRAD Level II archive.