Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 113, NWS Des Moines, IA

July 7, 2008Hamilton County, Webster County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 7, 2008, 4:57 PM CDT for Hamilton County, Webster County, Iowa. It was in force for 33 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: Jul 7, 2008, 4:57 PM CDT (21:57 UTC)
Expired: Jul 7, 2008, 5:30 PM CDT
In force: 33 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Hamilton County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 63 km from the middle of the area, began a volume at 21:58 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
Jul 7, 5:00 PM CDT	TSTM WND DMG	3 N Boxholm, IA	2 INCH DIAMETER TREE LIMBS BROKEN, AND 1 1/2 FOOT TREE BROKEN.

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
Jul 7, 1:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.0 hours before the alert went out and 221 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: 1217 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 072157
TORDMX
IAC079-187-072230-
/O.NEW.KDMX.TO.W.0113.080707T2157Z-080707T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
457 PM CDT MON JUL 7 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN HAMILTON COUNTY IN CENTRAL IOWA...
  SOUTHEASTERN WEBSTER COUNTY IN CENTRAL IOWA...

* UNTIL 530 PM CDT.

* AT 453 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR HARCOURT...
  OR 21 MILES SOUTH OF FORT DODGE...MOVING NORTHEAST AT 28 MPH.

* THE TORNADO WILL BE NEAR...
  DAYTON BY 505 PM CDT...
  LEHIGH BY 515 PM CDT...
  STRATFORD BY 520 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT MONDAY
EVENING FOR NORTHERN IOWA.

LAT...LON 4221 9379 4221 9401 4221 9417 4221 9418
      4229 9422 4244 9392
TIME...MOT...LOC 2157Z 243DEG 24KT 4222 9413

$$

2 follow-up statements

000 
WWUS53 KDMX 072214 RRA
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
514 PM CDT MON JUL 7 2008

IAC079-187-072230-
/O.CON.KDMX.TO.W.0113.000000T0000Z-080707T2230Z/
WEBSTER IA-HAMILTON IA-
514 PM CDT MON JUL 7 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHWESTERN HAMILTON AND SOUTHEASTERN WEBSTER COUNTIES...

AT 511 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR DAYTON...OR 18
MILES SOUTHEAST OF FORT DODGE...MOVING NORTHEAST AT 28 MPH.

THE TORNADO WILL BE NEAR...
  STRATFORD BY 520 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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT MONDAY
EVENING FOR NORTHERN IOWA.

LAT...LON 4221 9379 4221 9401 4221 9417 4221 9418
      4229 9422 4244 9392
TIME...MOT...LOC 2214Z 241DEG 25KT 4229 9398

$$

000 
WWUS53 KDMX 072223 RRA
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
524 PM CDT MON JUL 7 2008

IAC079-187-072234-
/O.EXP.KDMX.TO.W.0113.000000T0000Z-080707T2230Z/
WEBSTER IA-HAMILTON IA-
524 PM CDT MON JUL 7 2008

...THE TORNADO WARNING FOR SOUTHWESTERN HAMILTON AND SOUTHEASTERN
WEBSTER COUNTIES WILL EXPIRE AT 530 PM CDT...

AT 519 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT MONDAY
EVENING FOR NORTHERN IOWA.

LAT...LON 4221 9379 4221 9401 4221 9417 4221 9418
      4229 9422 4244 9392
TIME...MOT...LOC 2224Z 241DEG 25KT 4232 9390

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 11:32 PM CDT	Areal Flood Advisory	DMX	Mahaska	118 min
Jul 7, 12:04 AM CDT	Severe Thunderstorm Warning	DMX	Wapello	39 min
Jul 7, 1:43 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	47 min
Jul 7, 2:27 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	17 min
Jul 7, 3:15 PM CDT	Flash Flood Warning	DMX	Cerro Gordo, Worth	76 min
Jul 7, 3:24 PM CDT	Tornado Warning	DMX	Cerro Gordo	20 min
Jul 7, 3:35 PM CDT	Flash Flood Watch	DMX	Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Emmet and 14 more	5 hr
Jul 7, 3:58 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll	47 min
Jul 7, 4:02 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Greene, Webster	43 min
Jul 7, 4:10 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Greene	35 min
Jul 7, 4:19 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	41 min
Jul 7, 4:42 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene, Webster	48 min
Jul 7, 4:49 PM CDT	Areal Flood Advisory	DMX	Greene	119 min
Jul 7, 4:49 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin	56 min
Jul 7, 4:51 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	39 min
Jul 7, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Webster	46 min
Jul 7, 5:05 PM CDT	Areal Flood Advisory	DMX	Webster	2 hr
Jul 7, 5:12 PM CDT	Severe Thunderstorm Warning	DMX	Boone	17 min
Jul 7, 5:49 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler	56 min
Jul 7, 5:53 PM CDT	Areal Flood Advisory	DMX	Bremer, Butler	2 hr
Jul 7, 6:18 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin, Grundy, Hardin	22 min
Jul 7, 6:39 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy	66 min
Jul 7, 6:51 PM CDT	Areal Flood Advisory	DMX	Black Hawk	76 min
Jul 7, 6:58 PM CDT	Areal Flood Advisory	DMX	Grundy	69 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; radar from the NEXRAD Level II archive.