Alert archive / Iowa / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 430, NWS Des Moines, IA

July 21, 20085 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 21, 2008, 2:03 AM CDT for 5 counties in Iowa. It was in force for 57 min. 14 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
Jul 21, 2008, 2:03 AM CDT (07:03 UTC)
Expired
Jul 21, 2008, 3:00 AM CDT
In force
57 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon

Counties Audubon County, IA, Calhoun County, IA, Carroll County, IA, Greene County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 86 km from the middle of the area, began a volume at 07:05 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

TimeReportWhereRemark
Jul 21, 2:20 AM CDTTSTM WND DMG3 S Dedham, IATRAINED SPOTTER REPORTS EXTENSIVE POWER LINE DAMAGE IN THE CARROLL AREA.
Jul 21, 2:23 AM CDTTSTM WND GST 763 Ene Carroll Airport, IAFROM KCCI-TV SCHOOLNET SITE
Jul 21, 2:28 AM CDTTSTM WND GST 78Glidden, IAMEASURED BY KCCI-TV SCHOOLNET SITE
Jul 21, 2:30 AM CDTTSTM WND DMGBayard, IAPOWER OUT IN TOWN. A FEW FIRES CAUSED BY TREE LIMBS ON POWERLINES.
Jul 21, 2:35 AM CDTTSTM WND DMGBagley, IASEVERAL TREES DOWN AND POWER OUT IN TOWN.
Jul 21, 2:35 AM CDTTSTM WND DMGJamaica, IASIGNIFICANT TREE DAMAGE IN TOWN WITH 50 PERCENT OF TREES DAMAGED AND 30 TREES DOWN. 2 SHEDS DAMAGED WITH ROOF OFF SHED AT THE RACE TRACK. THE GUTHRIE COUNTY MOBILE EOC SEVERELY DAMAGED AND TOSSED 150 FEET INTO A FIELD.
Jul 21, 2:40 AM CDTTSTM WND GST 633 N Guthrie Center, IATREE DAMAGE.
Jul 21, 2:44 AM CDTTSTM WND DMGScranton, IANUMEROUS TREES DOWN DUE TO VERY HIGH WINDS.
Jul 21, 2:45 AM CDTTSTM WND DMGJamaica, IA3 TO 4 FOOT DIAMETER TREES DOWN. ROADS IMPASSABLE. A TRAVEL TRAILER WAS BLOWN APPROXIMATELY 150 FT.
Jul 21, 2:50 AM CDTTSTM WND DMGJamaica, IA4 INCH FLAG POLE BENT. POWER OUT.
Jul 21, 2:52 AM CDTTSTM WND GST 601 Wnw Panora, IAFROM KCCI TV SCHOOLNET SITE
Jul 21, 3:00 AM CDTTSTM WND DMGGrand Junction, IANUMEROUS TREES DOWN...SOME UP TO TWO FEET IN DIAMETER. POWER OUTAGES...ESPECIALLY IN RURAL AREAS. TIME ESTIMATED.
Jul 21, 3:00 AM CDTTSTM WND DMGS Guthrie Center, IAPOWER OUT. NUMEROUS TREE LIMBS DOWN. ONE 18 INCHES. PICKED UP SWING SET AND ROLLED IT ACROSS THE YARDS. TIME ESTIMATED.
Jul 21, 3:05 AM CDTTSTM WND GST 633 N Guthrie Center, IATREE DAMAGE.

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.

IssuedProductOfficeLasted
Jul 20, 11:25 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.1 hours before the alert went out and 164 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, Omaha, NE at 00:00Z on 2008-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3989 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, Omaha, NE at 00:00Z on 2008-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.193958Sfc1 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
3989 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
1202 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
306 m²/s²
Significant tornado parameter
3.7
Supercell composite
26.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDMX 210704
SVRDMX
IAC009-025-027-073-077-210800-
/O.NEW.KDMX.SV.W.0430.080721T0703Z-080721T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
203 AM CDT MON JUL 21 2008

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN AUDUBON COUNTY IN WEST CENTRAL IOWA...
  SOUTHERN CALHOUN COUNTY IN WEST CENTRAL IOWA...
  EASTERN CARROLL COUNTY IN WEST CENTRAL IOWA...
  GREENE COUNTY IN WEST CENTRAL IOWA...
  GUTHRIE COUNTY IN WEST CENTRAL IOWA...

* UNTIL 300 AM CDT.

* AT 201 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 80 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 10 MILES NORTHWEST OF YETTER TO CARROLL TO 7 MILES
  WEST OF GRAY...OR ALONG A LINE EXTENDING FROM 20 MILES SOUTHEAST OF
  STORM LAKE TO 32 MILES SOUTHEAST OF IDA GROVE TO 40 MILES SOUTHEAST
  OF IDA GROVE...AND MOVING SOUTHEAST AT 61 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  TEMPLETON...GRAY AND CARROLL BY 205 AM CDT...
  CARROLL AIRPORT...YETTER...WILLEY AND DEDHAM BY 210 AM CDT...
  AUDUBON AIRPORT...LIDDERDALE AND LAKE CITY BY 215 AM CDT...

THE DAMAGING WINDS WILL LIKELY LAST AT LEAST 10 MINUTES ALONG WITH 
VERY HEAVY RAIN. 

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

GO TO A BASEMENT OR SMALL INTERIOR ROOM. EXTENSIVE DAMAGE IS LIKELY.
EVACUATE MOBILE HOMES...AND SEEK SHELTER IN A STURDY BUILDING. SEVERE
STRAIGHT LINE WINDS CAN SOUND LIKE A TORNADO...AND PRODUCE SIMILAR
DAMAGE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM CDT MONDAY
MORNING FOR IOWA.

LAT...LON 4186 9509 4189 9500 4220 9481 4221 9486
      4247 9487 4248 9491 4250 9491 4228 9441
      4221 9440 4221 9424 4219 9420 4186 9422
      4186 9429 4171 9429 4154 9452 4176 9509
TIME...MOT...LOC 0703Z 295DEG 53KT 4237 9498 4205 9493
          4181 9509

$$

JOHNSON
2 follow-up statements
000 
WWUS53 KDMX 210723 RRA
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
222 AM CDT MON JUL 21 2008

IAC009-025-027-073-077-210800-
/O.CON.KDMX.SV.W.0430.000000T0000Z-080721T0800Z/
CALHOUN IA-CARROLL IA-GREENE IA-GUTHRIE IA-AUDUBON IA-
222 AM CDT MON JUL 21 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR NORTHERN AUDUBON...GUTHRIE...GREENE...EASTERN CARROLL AND
SOUTHERN CALHOUN COUNTIES...

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN 
CARROLL...SOUTHWEST CALHOUN AND SOUTHEAST SAC COUNTIES THROUGH 3 
AM...

AT 218 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 80 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM LAKE CITY TO WILLEY TO AUDUBON...OR ALONG
A LINE EXTENDING FROM 32 MILES SOUTHEAST OF STORM LAKE TO 45 MILES
SOUTHEAST OF IDA GROVE TO 51 MILES SOUTHEAST OF IDA GROVE...MOVING
EAST AT 57 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  LOHRVILLE...SCRANTON AND BAYARD BY 230 AM CDT...
  CHURDAN AND BAGLEY BY 235 AM CDT...
  FARNHAMVILLE...JEFFERSON...GUTHRIE CENTER AND BAGLEY BY 240 AM
  CDT...
  YALE BY 245 AM CDT...

FOR YOUR PROTECTION GO TO THE BASEMENT OR AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL
TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM CDT MONDAY
MORNING FOR IOWA.

LAT...LON 4186 9509 4189 9500 4220 9481 4221 9486
      4247 9487 4248 9491 4250 9491 4228 9441
      4221 9440 4221 9424 4219 9420 4186 9422
      4186 9429 4171 9429 4154 9452 4176 9509
TIME...MOT...LOC 0722Z 288DEG 49KT 4228 9471 4196 9466
          4172 9483

$$
000 
WWUS53 KDMX 210755
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
255 AM CDT MON JUL 21 2008

IAC009-025-027-073-077-210805-
/O.EXP.KDMX.SV.W.0430.000000T0000Z-080721T0800Z/
CALHOUN IA-CARROLL IA-GREENE IA-GUTHRIE IA-AUDUBON IA-
255 AM CDT MON JUL 21 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN AUDUBON...GUTHRIE...
GREENE...EASTERN CARROLL AND SOUTHERN CALHOUN COUNTIES WILL EXPIRE AT
300 AM CDT...

...A TORNADO WARNING REMAINS IN EFFECDT FOR SOUTHEAST GREENE 
COUNTY...

AT 252 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED TO
EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM CDT MONDAY
MORNING FOR IOWA.

LAT...LON 4186 9509 4189 9500 4220 9481 4221 9486
      4247 9487 4248 9491 4250 9491 4228 9441
      4221 9440 4221 9424 4219 9420 4186 9422
      4186 9429 4171 9429 4154 9452 4176 9509
TIME...MOT...LOC 0755Z 288DEG 49KT 4214 9413 4182 9409
          4158 9426

$$

JOHNSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 1:09 AM CDTSevere Thunderstorm WarningDMXDallas, Polk51 min
Jul 21, 1:10 AM CDTSevere Thunderstorm WarningDMXCarroll, Crawford, Sac65 min
Jul 21, 1:15 AM CDTSevere Thunderstorm WarningDMXJasper, Marion45 min
Jul 21, 1:33 AM CDTSevere Thunderstorm WarningDMXJasper, Marion, Polk, Warren42 min
Jul 21, 1:47 AM CDTFlash Flood WarningDMXCrawford, Sac4 hr
Jul 21, 1:54 AM CDTAreal Flood AdvisoryDMXCalhoun, Humboldt, Pocahontas, Webster3 hr
Jul 21, 2:00 AM CDTSevere Thunderstorm WarningDMXMahaska, Marion45 min
Jul 21, 2:10 AM CDTTornado WarningDMXCalhoun, Carroll, Sac50 min
Jul 21, 2:19 AM CDTSevere Thunderstorm WarningDMXBoone, Greene41 min
Jul 21, 2:20 AM CDTFlash Flood WarningDMXCarroll3 hr
Jul 21, 2:33 AM CDTSevere Thunderstorm WarningDMXBoone, Dallas, Greene, Guthrie, Polk, Story57 min
Jul 21, 2:39 AM CDTFlash Flood WarningDMXMahaska4 hr
Jul 21, 2:48 AM CDTTornado WarningDMXBoone, Dallas, Greene42 min
Jul 21, 2:51 AM CDTSevere Thunderstorm WarningDMXMahaska, Wapello27 min
Jul 21, 3:06 AM CDTSevere Thunderstorm WarningDMXMarshall, Story54 min
Jul 21, 3:14 AM CDTSevere Thunderstorm WarningDMXMadison, Marion, Polk, Warren61 min
Jul 21, 3:16 AM CDTSevere Thunderstorm WarningDMXWapello17 min
Jul 21, 3:17 AM CDTTornado WarningDMXPolk28 min
Jul 21, 3:21 AM CDTAreal Flood AdvisoryDMXBoone, Dallas, Greene, Jasper, Polk, Story3 hr
Jul 21, 3:22 AM CDTSevere Thunderstorm WarningDMXJasper53 min
Jul 21, 3:53 AM CDTAreal Flood AdvisoryDMXJasper, Madison, Marshall, Story, Warren8 days
Jul 21, 3:53 AM CDTSevere Thunderstorm WarningDMXJasper, Lucas, Mahaska, Marion, Monroe, Poweshiek and 1 more67 min
Jul 21, 4:05 AM CDTSevere Thunderstorm WarningDMXMarshall, Tama40 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2008Every 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.