Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 73, NWS Des Moines, IA

May 6, 2012Audubon County, Guthrie County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 6, 2012, 5:52 AM CDT for Audubon County, Guthrie County, Iowa. It was in force for 53 min. 3 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
May 6, 2012, 5:52 AM CDT (10:52 UTC)
Expired
May 6, 2012, 6:45 AM CDT
In force
53 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Audubon County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 105 km from the middle of the area, began a volume at 10:52 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 6, 6:10 AM CDTHAIL 0.884 W Audubon Airport, IA
May 6, 6:13 AM CDTHAIL 14 W Audubon Airport, IA
May 6, 6:20 AM CDTHAIL 1Audubon, IA

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, 10.9 hours before the alert went out and 122 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 2012-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2892 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 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
2892 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1936 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.1
Supercell composite
6.4

Open this sounding in Storm Lab

The text

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

049 
WUUS53 KDMX 061052
SVRDMX
IAC009-077-061145-
/O.NEW.KDMX.SV.W.0073.120506T1052Z-120506T1145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
552 AM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

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

* UNTIL 645 AM CDT

* AT 552 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
  ELK HORN...OR 17 MILES NORTH OF ATLANTIC...AND MOVING NORTHEAST AT
  25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  AUDUBON...AUDUBON AIRPORT AND GRAY.

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 4186 9499 4186 9463 4159 9491 4159 9505
      4160 9505 4160 9509 4160 9510 4170 9510
TIME...MOT...LOC 1053Z 211DEG 22KT 4165 9499
WIND...HAIL 60MPH 1.00IN

$$

ZOGG
3 follow-up statements
686 
WWUS53 KDMX 061104
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
604 AM CDT SUN MAY 6 2012

IAC009-077-061145-
/O.CON.KDMX.SV.W.0073.000000T0000Z-120506T1145Z/
GUTHRIE IA-AUDUBON IA-
604 AM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR AUDUBON AND
NORTHWESTERN GUTHRIE COUNTIES UNTIL 645 AM CDT...

AT 601 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
AUDUBON...OR 21 MILES NORTH OF ATLANTIC...MOVING NORTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  AUDUBON AND GRAY.

LAT...LON 4186 9499 4186 9463 4159 9491 4165 9510
TIME...MOT...LOC 1105Z 211DEG 22KT 4171 9494
WIND...HAIL 60MPH 1.00IN

$$

ZOGG
721 
WWUS53 KDMX 061118
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
618 AM CDT SUN MAY 6 2012

IAC009-077-061145-
/O.CON.KDMX.SV.W.0073.000000T0000Z-120506T1145Z/
GUTHRIE IA-AUDUBON IA-
618 AM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
AUDUBON AND NORTHWESTERN GUTHRIE COUNTIES UNTIL 645 AM CDT...

AT 615 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
AUDUBON...OR 21 MILES SOUTH OF CARROLL...MOVING NORTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  GRAY.

LAT...LON 4166 9484 4169 9507 4186 9499 4186 9463
TIME...MOT...LOC 1118Z 211DEG 22KT 4178 9488
WIND...HAIL 60MPH 1.00IN

$$

ZOGG
872 
WWUS53 KDMX 061140
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
640 AM CDT SUN MAY 6 2012

IAC009-077-061150-
/O.EXP.KDMX.SV.W.0073.000000T0000Z-120506T1145Z/
GUTHRIE IA-AUDUBON IA-
640 AM CDT SUN MAY 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN AUDUBON AND
NORTHWESTERN GUTHRIE COUNTIES WILL EXPIRE AT 645 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 4166 9484 4169 9507 4186 9499 4186 9463
TIME...MOT...LOC 1140Z 211DEG 22KT 4190 9479

$$

ZOGG

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 4:32 AM CDTSevere Thunderstorm WarningDMXHamilton, Wright43 min
May 6, 6:30 AM CDTSevere Thunderstorm WarningDMXAdair, Cass45 min
May 6, 7:05 AM CDTSevere Thunderstorm WarningDMXAdair, Dallas, Guthrie, Madison25 min
May 6, 7:09 AM CDTSevere Thunderstorm WarningDMXAdair, Madison22 min
May 6, 7:29 AM CDTSevere Thunderstorm WarningDMXAdair, Dallas, Guthrie, Madison31 min
May 6, 7:59 AM CDTSevere Thunderstorm WarningDMXDallas, Polk46 min
May 6, 8:27 AM CDTSevere Thunderstorm WarningDMXJasper, Marion, Polk, Warren48 min
May 6, 9:03 AM CDTSevere Thunderstorm WarningDMXJasper, Marion42 min
May 6, 9:12 AM CDTSevere Thunderstorm WarningDMXJasper, Marion48 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.