Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 87, NWS Des Moines, IA

June 9, 2008Mahaska County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 9, 2008, 6:32 PM CDT for Mahaska County, Iowa. It was in force for 28 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
Jun 9, 2008, 6:32 PM CDT (23:32 UTC)
Expired
Jun 9, 2008, 7:00 PM CDT
In force
28 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon

County Mahaska County, IA

The radar

The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 23:32 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 169 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2008-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 154 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2008-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
154 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
500 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 092332
TORDMX
IAC123-100000-
/O.NEW.KDMX.TO.W.0087.080609T2332Z-080610T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
632 PM CDT MON JUN 9 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL MAHASKA COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 700 PM CDT.

* AT 628 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES
  NORTHWEST OF ROSE HILL...OR 22 MILES WEST OF SIGOURNEY...MOVING
  EAST AT 13 MPH.

* THE TORNADO WILL BE NEAR...
  ROSE HILL BY 700 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 4124 9242 4137 9269 4142 9265 4140 9241
      4132 9241 4125 9241
TIME...MOT...LOC 2332Z 279DEG 11KT 4138 9260

$$

ALBRECHT
2 follow-up statements
000 
WWUS53 KDMX 092339
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
639 PM CDT MON JUN 9 2008

IAC123-100000-
/O.CON.KDMX.TO.W.0087.000000T0000Z-080610T0000Z/
MAHASKA IA-
639 PM CDT MON JUN 9 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR EAST
CENTRAL MAHASKA COUNTY...

AT 637 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 8 MILES NORTHWEST OF
ROSE HILL...OR 20 MILES WEST OF SIGOURNEY...MOVING EAST AT 13 MPH.

THE TORNADO WILL BE NEAR...
  6 MILES NORTH OF ROSE HILL BY 700 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.

LAT...LON 4128 9242 4137 9262 4142 9262 4140 9241
TIME...MOT...LOC 2339Z 262DEG 11KT 4139 9258

$$

ALBRECHT
000 
WWUS53 KDMX 092356
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
656 PM CDT MON JUN 9 2008

IAC123-100006-
/O.EXP.KDMX.TO.W.0087.000000T0000Z-080610T0000Z/
MAHASKA IA-
656 PM CDT MON JUN 9 2008

...THE TORNADO WARNING FOR EAST CENTRAL MAHASKA COUNTY WILL EXPIRE AT
700 PM CDT...

AT 655 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.

LAT...LON 4128 9242 4137 9262 4142 9262 4140 9241
TIME...MOT...LOC 2356Z 262DEG 11KT 4140 9251

$$

ALBRECHT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 8, 7:10 PM CDTSevere Thunderstorm WarningDMXDavis, Wapello39 min
Jun 8, 7:26 PM CDTTornado WarningDMXWapello16 min
Jun 8, 7:53 PM CDTAreal Flood WarningDMXBlack Hawk, Boone, Bremer, Butler, Calhoun, Cerro Gordo and 20 more12 hr
Jun 8, 8:41 PM CDTRiver Flood WarningDMXPolk8 hr
Jun 8, 8:42 PM CDTFlash Flood WarningDMXCerro Gordo6 hr
Jun 9, 7:39 AM CDTAreal Flood WarningDMXBlack Hawk, Boone, Bremer, Butler, Calhoun, Cerro Gordo and 20 more12 hr
Jun 9, 9:50 AM CDTRiver Flood WarningDMXMahaska, Marion28 days
Jun 9, 4:37 PM CDTSevere Thunderstorm WarningDMXPoweshiek38 min
Jun 9, 4:53 PM CDTFlash Flood WarningDMXPoweshiek6 hr
Jun 9, 6:07 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion38 min
Jun 9, 6:19 PM CDTSevere Thunderstorm WarningDMXTaylor41 min
Jun 9, 6:55 PM CDTSevere Thunderstorm WarningDMXTaylor50 min

Nearby

Tornado Warnings in Iowa, 2008Every tornado warning in 2008Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.