Alert archive / Iowa / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 21, NWS Des Moines, IA

April 24, 2008Carroll County, Greene County, Guthrie County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 24, 2008, 7:35 PM CDT for Carroll County, Greene County, Guthrie County, Iowa. It was in force for 55 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: Apr 24, 2008, 7:35 PM CDT (00:35 UTC)
Expired: Apr 24, 2008, 8:30 PM CDT
In force: 55 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Carroll County, IA, Greene County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 75 km from the middle of the area, began a volume at 00:37 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
Apr 24, 8:25 PM CDT	HAIL 0.88	Jefferson, IA	DELAYED REPORT OF NICKEL SIZE HAIL IN JEFFERSON.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.6 hours before the alert went out and 160 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: 1577 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 484 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 250035
SVRDMX
IAC027-073-077-250130-
/O.NEW.KDMX.SV.W.0021.080425T0035Z-080425T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
735 PM CDT THU APR 24 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CARROLL COUNTY IN WEST CENTRAL IOWA...
  WESTERN GREENE COUNTY IN WEST CENTRAL IOWA...
  NORTHERN GUTHRIE COUNTY IN WEST CENTRAL IOWA...

* UNTIL 830 PM CDT.

* AT 733 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTHWEST OF COON
  RAPIDS TO 12 MILES SOUTHWEST OF COON RAPIDS...OR ALONG A LINE
  EXTENDING FROM 46 MILES SOUTHEAST OF IDA GROVE TO 55 MILES
  SOUTHEAST OF IDA GROVE...AND MOVING EAST AT 26 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  COON RAPIDS BY 745 PM CDT...
  SCRANTON BY 755 PM CDT...
  BAYARD BY 800 PM CDT...
  JEFFERSON AND BAGLEY BY 820 PM CDT...
  YALE BY 825 PM CDT...
  JAMAICA BY 830 PM CDT...

MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU LIVE IN A
MOBILE HOME...SEEK SHELTER IN A STURDY BUILDING.

LAT...LON 4212 9430 4178 9429 4168 9475 4182 9476
      4183 9475 4186 9475 4186 9476 4200 9476
TIME...MOT...LOC 0035Z 251DEG 23KT 4196 9472 4172 9478

$$

JUNGBLUTH

2 follow-up statements

000 
WWUS53 KDMX 250103
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
802 PM CDT THU APR 24 2008

IAC027-250112-
/O.CAN.KDMX.SV.W.0021.000000T0000Z-080425T0130Z/
CARROLL IA-
802 PM CDT THU APR 24 2008

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARROLL COUNTY IS
CANCELLED...

AT 758 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
AREA...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. 
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 4203 9464 4212 9430 4178 9429 4175 9464
TIME...MOT...LOC 0102Z 252DEG 27KT 4202 9445 4179 9451

$$

IAC073-077-250130-
/O.CON.KDMX.SV.W.0021.000000T0000Z-080425T0130Z/
GREENE IA-GUTHRIE IA-
802 PM CDT THU APR 24 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR NORTHERN GUTHRIE AND SOUTHWESTERN GREENE COUNTIES...

AT 758 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM SCRANTON TO BAYARD...OR
ALONG A LINE EXTENDING FROM 38 MILES SOUTHWEST OF FORT DODGE TO 50
MILES WEST OF DES MOINES...MOVING EAST AT 31 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  JEFFERSON AND BAGLEY BY 810 PM CDT...
  YALE BY 815 PM CDT...
  JAMAICA BY 825 PM CDT...

RECENT REPORTS FROM THIS STORM INCLUDED PEA SIZE HAIL AND 25 MPH 
WINDS IN COON RAPIDS...BUT LARGER HAIL IS LIKELY ACROSS SOUTHERN 
GREENE COUNTY.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL...DAMAGING WINDS AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG
BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4203 9464 4212 9430 4178 9429 4175 9464
TIME...MOT...LOC 0102Z 252DEG 27KT 4202 9445 4179 9451

$$

JUNGBLUTH

000 
WWUS53 KDMX 250120
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
820 PM CDT THU APR 24 2008

IAC077-250130-
/O.CAN.KDMX.SV.W.0021.000000T0000Z-080425T0130Z/
GUTHRIE IA-
820 PM CDT THU APR 24 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN GUTHRIE COUNTY IS
CANCELLED...

AT 819 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
AREA...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY. 
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 4212 9430 4186 9429 4186 9435 4186 9437
      4186 9449 4207 9449
TIME...MOT...LOC 0120Z 258DEG 24KT 4203 9433 4188 9433

$$

IAC073-250130-
/O.CON.KDMX.SV.W.0021.000000T0000Z-080425T0130Z/
GREENE IA-
820 PM CDT THU APR 24 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR CENTRAL GREENE COUNTY...

AT 819 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM JEFFERSON TO 10 MILES SOUTH
OF JEFFERSON...OR ALONG A LINE EXTENDING FROM 34 MILES SOUTH OF FORT
DODGE TO 42 MILES NORTHWEST OF DES MOINES...MOVING EAST AT 27 MPH.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL...DAMAGING WINDS AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG
BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4212 9430 4186 9429 4186 9435 4186 9437
      4186 9449 4207 9449
TIME...MOT...LOC 0120Z 258DEG 24KT 4203 9433 4188 9433

$$

JUNGBLUTH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 8:16 PM CDT	Severe Thunderstorm Warning	DMX	Franklin, Hamilton, Hardin, Wright	44 min
Apr 24, 8:29 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene	35 min
Apr 24, 8:35 PM CDT	Tornado Warning	DMX	Franklin, Hamilton, Hardin, Wright	40 min
Apr 24, 8:47 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene	18 min
Apr 24, 9:07 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin, Grundy, Hardin	38 min
Apr 24, 9:17 PM CDT	Areal Flood Advisory	DMX	Bremer, Butler, Franklin	3 hr
Apr 24, 10:56 PM CDT	Areal Flood Advisory	DMX	Black Hawk, Grundy	3 hr
Apr 25, 1:59 AM CDT	Areal Flood Advisory	DMX	Black Hawk, Grundy	3 hr
Apr 25, 2:16 AM CDT	River Flood Warning	DMX	Boone, Webster	5 days
Apr 25, 2:18 AM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	42 min
Apr 25, 2:23 AM CDT	River Flood Warning	DMX	Cerro Gordo, Floyd, Worth	32 hr
Apr 25, 2:32 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	43 min
Apr 25, 2:38 AM CDT	River Flood Warning	DMX	Black Hawk, Butler	65 hr
Apr 25, 2:41 AM CDT	River Flood Warning	DMX	Black Hawk	5 days
Apr 25, 3:00 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie, Madison, Union	45 min
Apr 25, 3:19 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Union, Warren	41 min
Apr 25, 3:47 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	43 min
Apr 25, 3:53 AM CDT	Severe Thunderstorm Warning	DMX	Marion, Polk, Warren	52 min
Apr 25, 4:25 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion	50 min
Apr 25, 4:42 AM CDT	Flash Flood Warning	DMX	Black Hawk	6 hr
Apr 25, 4:54 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe, Wapello	40 min
Apr 25, 4:59 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Poweshiek	46 min
Apr 25, 5:06 AM CDT	Flash Flood Warning	DMX	Bremer, Butler, Franklin, Grundy, Hardin	6 hr
Apr 25, 6:51 AM CDT	River Flood Warning	DMX	Marshall	3 days
Apr 25, 7:03 AM CDT	River Flood Warning	DMX	Humboldt, Kossuth	5 days
Apr 25, 7:09 AM CDT	River Flood Warning	DMX	Hamilton, Webster	14 hr
Apr 25, 7:17 AM CDT	River Flood Warning	DMX	Black Hawk, Butler	6 days
Apr 25, 7:19 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	61 hr
Apr 25, 7:27 AM CDT	River Flood Warning	DMX	Black Hawk	6 days
Apr 25, 7:51 AM CDT	River Flood Warning	DMX	Dallas	13 hr
Apr 25, 7:55 AM CDT	River Flood Warning	DMX	Polk	27 hr
Apr 25, 7:55 AM CDT	River Flood Warning	DMX	Polk	13 hr
Apr 25, 7:58 AM CDT	River Flood Warning	DMX	Madison, Warren	26 hr
Apr 25, 8:06 AM CDT	River Flood Warning	DMX	Mahaska	5 days
Apr 25, 10:01 AM CDT	Areal Flood Warning	DMX	Tama	12 hr
Apr 25, 10:58 AM CDT	Areal Flood Warning	DMX	Black Hawk, Bremer, Butler, Franklin, Grundy, Hardin and 2 more	12 hr
Apr 25, 11:11 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer	23 hr
Apr 25, 11:11 AM CDT	River Flood Warning	DMX	Polk	10 hr
Apr 25, 11:11 AM CDT	River Flood Warning	DMX	Dallas, Polk	10 hr
Apr 25, 11:11 AM CDT	River Flood Warning	DMX	Humboldt	10 hr
Apr 25, 11:11 AM CDT	River Flood Warning	DMX	Polk, Story	28 hr
Apr 25, 11:11 AM CDT	River Flood Warning	DMX	Jasper	9 hr
Apr 25, 3:08 PM CDT	River Flood Warning	DMX	Story	5 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2008 Every severe thunderstorm warning 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.