Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 91, NWS Des Moines, IA

May 24, 2012Bremer County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 24, 2012, 4:30 PM CDT for Bremer County, Iowa. It was in force for 19 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
May 24, 2012, 4:30 PM CDT (21:30 UTC)
Expired
May 24, 2012, 4:49 PM CDT
In force
19 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Bremer County, IA

The radar

The La Crosse radar (KARX), 148 km from the middle of the area, began a volume at 21:32 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.

What was reported inside it

TimeReportWhereRemark
May 24, 4:44 PM CDTTSTM WND DMGSumner, IANUMEROUS LARGE TREES DOWNED FROM STRONG WINDS

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
May 24, 3:30 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.5 hours before the alert went out and 193 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 2012-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2012-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1568 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
20 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.

751 
WUUS53 KDMX 242130
SVRDMX
IAC017-242215-
/O.NEW.KDMX.SV.W.0091.120524T2130Z-120524T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
430 PM CDT THU MAY 24 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BREMER COUNTY IN NORTHEAST IOWA...

* UNTIL 515 PM CDT

* AT 425 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  DENVER...OR 14 MILES NORTH OF WATERLOO...AND MOVING NORTHEAST AT 55
  MPH. A SECOND SEVERE STORM WAS LOCATED NEAR WAVERLY MOVING         
  NORTHEAST AT 55 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  TRIPOLI...SUMNER AND FREDERIKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...
SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4265 9209 4264 9255 4291 9255 4291 9208
TIME...MOT...LOC 2130Z 211DEG 47KT 4274 9223
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS
2 follow-up statements
925 
WWUS53 KDMX 242143
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
443 PM CDT THU MAY 24 2012

IAC017-242215-
/O.CON.KDMX.SV.W.0091.000000T0000Z-120524T2215Z/
BREMER IA-
443 PM CDT THU MAY 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
BREMER COUNTY UNTIL 515 PM CDT...

AT 439 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
SUMNER...OR 17 MILES SOUTHEAST OF NEW HAMPTON...MOVING NORTHEAST AT 
55 MPH. A SECOND SEVERE STORM WAS LOCATED SOUTHWEST OF FREDERIKA AND 
MOVING NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHEASTERN BREMER COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4275 9209 4275 9254 4291 9249 4291 9208
TIME...MOT...LOC 2143Z 211DEG 47KT 4289 9211
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS
530 
WWUS53 KDMX 242149
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
449 PM CDT THU MAY 24 2012

IAC017-242159-
/O.CAN.KDMX.SV.W.0091.000000T0000Z-120524T2215Z/
BREMER IA-
449 PM CDT THU MAY 24 2012

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

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT.

LAT...LON 4275 9209 4275 9254 4291 9249 4291 9208
TIME...MOT...LOC 2149Z 211DEG 47KT 4296 9205

$$

BEERENDS

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 7:26 PM CDTSevere Thunderstorm WarningDMXCalhoun, Sac49 min
May 23, 8:15 PM CDTSevere Thunderstorm WarningDMXCalhoun, Carroll, Crawford, Sac45 min
May 23, 8:51 PM CDTSevere Thunderstorm WarningDMXCalhoun, Pocahontas39 min
May 24, 3:30 PM CDTSevere Thunderstorm WarningDMXButler, Franklin, Hardin45 min
May 24, 3:56 PM CDTSevere Thunderstorm WarningDMXBremer, Butler, Grundy49 min
May 24, 4:26 PM CDTSevere Thunderstorm WarningDMXDecatur, Wayne49 min
May 24, 4:55 PM CDTSevere Thunderstorm WarningDMXBlack Hawk, Grundy, Tama50 min
May 24, 5:51 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Poweshiek39 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012Every severe thunderstorm warning in 2012

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.