Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 3, NWS Des Moines, IA

April 10, 2008Clarke County, Lucas County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Apr 10, 2008, 4:49 PM CDT for Clarke County, Lucas County, Warren County, Iowa. It was in force for 26 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: Apr 10, 2008, 4:49 PM CDT (21:49 UTC)
Expired: Apr 10, 2008, 5:15 PM CDT
In force: 26 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Clarke County, IA, Lucas County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 59 km from the middle of the area, began a volume at 21:49 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
Apr 10, 2:28 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.8 hours before the alert went out and 242 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: 0 J/kg
Mixed-layer LCL: 467 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 226 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.

000 
WFUS53 KDMX 102149
TORDMX
IAC039-117-181-102215-
/O.NEW.KDMX.TO.W.0003.080410T2149Z-080410T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
449 PM CDT THU APR 10 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN CLARKE COUNTY IN SOUTH CENTRAL IOWA...
  NORTHWESTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHEASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 515 PM CDT.

* AT 444 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 12 MILES
  SOUTHWEST OF LACONA...OR 35 MILES SOUTH OF DES MOINES...MOVING
  NORTH AT 51 MPH.

* THE TORNADO WILL BE NEAR...
  6 MILES WEST OF LACONA BY 455 PM CDT...
  MILO BY 505 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 4135 9355 4135 9334 4122 9334 4106 9347
      4107 9364
TIME...MOT...LOC 2149Z 198DEG 45KT 4113 9353

$$

SMALL

2 follow-up statements

000 
WWUS53 KDMX 102206 RRA
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
506 PM CDT THU APR 10 2008

IAC039-117-102216-
/O.CAN.KDMX.TO.W.0003.000000T0000Z-080410T2215Z/
LUCAS IA-CLARKE IA-
506 PM CDT THU APR 10 2008

...THE TORNADO WARNING FOR NORTHEASTERN CLARKE AND NORTHWESTERN LUCAS
COUNTIES IS CANCELLED...

AT 505 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE EITHER WEAKENED OR
MOVED OUT OF THE AREA...AND NO LONGER POSE AN IMMEDIATE THREAT TO
LIFE OR PROPERTY. THEREFORE...THE TORNADO WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR SOUTHERN IOWA.

A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 900 PM CDT
THURSDAY EVENING FOR SOUTHWESTERN IOWA.

LAT...LON 4135 9355 4135 9334 4122 9334 4116 9339
      4116 9342 4116 9361 4117 9361
TIME...MOT...LOC 2206Z 221DEG 34KT 4121 9339

$$

IAC181-102215-
/O.CON.KDMX.TO.W.0003.000000T0000Z-080410T2215Z/
WARREN IA-
506 PM CDT THU APR 10 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
SOUTHEASTERN WARREN COUNTY...

AT 505 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR LACONA...OR 28
MILES SOUTHEAST OF DES MOINES...MOVING NORTHEAST AT 39 MPH.

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 1100 PM CDT THURSDAY EVENING
FOR SOUTHERN IOWA.

LAT...LON 4135 9355 4135 9334 4122 9334 4116 9339
      4116 9342 4116 9361 4117 9361
TIME...MOT...LOC 2206Z 221DEG 34KT 4121 9339

$$

SMALL

000 
WWUS53 KDMX 102218
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
518 PM CDT THU APR 10 2008

IAC181-102228-
/O.EXP.KDMX.TO.W.0003.000000T0000Z-080410T2215Z/
WARREN IA-
518 PM CDT THU APR 10 2008

...THE TORNADO WARNING FOR SOUTHEASTERN WARREN COUNTY HAS EXPIRED...

AT 514 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE...THE TORNADO WARNING HAS BEEN 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 1100 PM CDT THURSDAY EVENING
FOR SOUTHERN IOWA.

LAT...LON 4135 9355 4135 9334 4122 9334 4116 9339
      4116 9342 4116 9361 4117 9361
TIME...MOT...LOC 2206Z 221DEG 34KT 4121 9339

$$

SMALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 9:53 PM CDT	River Flood Warning	DMX	Lucas	60 hr
Apr 10, 4:17 AM CDT	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	17 hr
Apr 10, 4:24 PM CDT	Tornado Warning	DMX	Clarke, Decatur, Lucas, Wayne	51 min
Apr 10, 4:52 PM CDT	Tornado Warning	DMX	Appanoose, Wayne	23 min
Apr 10, 5:11 PM CDT	Tornado Warning	DMX	Appanoose, Mahaska, Marion, Monroe, Wapello	34 min
Apr 10, 5:25 PM CDT	Tornado Warning	DMX	Mahaska, Marion	20 min
Apr 10, 5:42 PM CDT	Tornado Warning	DMX	Mahaska, Poweshiek	48 min
Apr 10, 6:11 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Monroe	35 min
Apr 10, 6:27 PM CDT	Tornado Warning	DMX	Poweshiek, Tama	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.