Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 98, NWS Des Moines, IA

May 26, 2012Sac County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 26, 2012, 3:04 AM CDT for Sac County, Iowa. It was in force for 41 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 26, 2012, 3:04 AM CDT (08:04 UTC)
Expired
May 26, 2012, 3:45 AM CDT
In force
41 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Sac County, IA

What was reported inside it

TimeReportWhereRemark
May 26, 3:20 AM CDTHAIL 14 W Schaller, IAQUARTER SIZE HAIL ALONG ARMSTRONG AVENUE.

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, 8.1 hours before the alert went out and 163 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 2012-05-26Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2012-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 328 square meters per square second.19395878Sfc1 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
1031 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
328 m²/s²
0-3 km storm-relative helicity
876 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.1

Open this sounding in Storm Lab

The text

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

162 
WUUS53 KDMX 260804
SVRDMX
IAC161-260845-
/O.NEW.KDMX.SV.W.0098.120526T0804Z-120526T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
304 AM CDT SAT MAY 26 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN SAC COUNTY IN WEST CENTRAL IOWA...

* UNTIL 345 AM CDT

* AT 300 AM 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
  GALVA...OR 14 MILES SOUTHWEST OF STORM LAKE...AND MOVING NORTHEAST
  AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SCHALLER AND NEMAHA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A
MOBILE HOME...GET OUT NOW...AND SEEK SHELTER IN A REINFORCED
BUILDING.

&&

LAT...LON 4257 9539 4257 9493 4256 9492 4255 9492
      4240 9532 4247 9533 4247 9538 4248 9539
      4256 9540
TIME...MOT...LOC 0804Z 244DEG 23KT 4249 9532
WIND...HAIL 60MPH 1.00IN

$$

SMALL
2 follow-up statements
119 
WWUS53 KDMX 260820
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
320 AM CDT SAT MAY 26 2012

IAC161-260845-
/O.CON.KDMX.SV.W.0098.000000T0000Z-120526T0845Z/
SAC IA-
320 AM CDT SAT MAY 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
SAC COUNTY UNTIL 345 AM CDT...

AT 317 AM 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 9 MILES
SOUTH OF LAKESIDE...OR 11 MILES SOUTH OF STORM LAKE...MOVING EAST AT
35 MPH.

LOCATIONS IMPACTED INCLUDE...
  NEMAHA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4257 9539 4257 9493 4256 9492 4255 9492
      4240 9532 4247 9533 4247 9538 4248 9539
      4256 9540
TIME...MOT...LOC 0820Z 251DEG 30KT 4250 9517
WIND...HAIL 60MPH 1.00IN

$$

SMALL
108 
WWUS53 KDMX 260836
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
336 AM CDT SAT MAY 26 2012

IAC161-260846-
/O.EXP.KDMX.SV.W.0098.000000T0000Z-120526T0845Z/
SAC IA-
336 AM CDT SAT MAY 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SAC COUNTY WILL
EXPIRE AT 345 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 4257 9539 4257 9493 4256 9492 4255 9492
      4240 9532 4247 9533 4247 9538 4248 9539
      4256 9540
TIME...MOT...LOC 0836Z 251DEG 30KT 4254 9500

$$

SMALL

The office that day

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

IssuedProductOfficeCountiesLasted
May 25, 7:18 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Story28 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.