Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 76, NWS Des Moines, IA

May 6, 2012Adair County, Madison County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 6, 2012, 7:09 AM CDT for Adair County, Madison County, Iowa. It was in force for 22 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 6, 2012, 7:09 AM CDT (12:09 UTC)
Expired
May 6, 2012, 7:31 AM CDT
In force
22 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Adair County, IA, Madison County, IA

The radar

The Des Moines radar (KDMX), 76 km from the middle of the area, began a volume at 12:10 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, 7:23 AM CDTTSTM WND GST 778 Ene Greenfield, IAALSO MEASURED A 73 MPH GUST AT 726 AM.

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 12:00Z, 0.2 hours before the alert went out and 171 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 12:00Z on 2012-05-06Temperature 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 12:00Z on 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -415 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
880 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
-415 m²/s²
0-3 km storm-relative helicity
-233 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.

249 
WUUS53 KDMX 061209
SVRDMX
IAC001-121-061300-
/O.NEW.KDMX.SV.W.0076.120506T1209Z-120506T1300Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ADAIR COUNTY IN SOUTHWEST IOWA...
  SOUTHWESTERN MADISON COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 800 AM CDT

* AT 705 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 7 MILES
  SOUTHWEST OF GREENFIELD...OR 14 MILES NORTHWEST OF CRESTON...AND
  MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GREENFIELD...WINTERSET...ORIENT AND MACKSBURG.

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 4116 9459 4130 9463 4141 9402 4117 9396
      4115 9421
TIME...MOT...LOC 1209Z 260DEG 25KT 4123 9449
WIND...HAIL 60MPH 1.00IN

$$

ZOGG
1 follow-up statement
956 
WWUS53 KDMX 061231
SVSDMX

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

IAC001-121-061241-
/O.CAN.KDMX.SV.W.0076.000000T0000Z-120506T1300Z/
MADISON IA-ADAIR IA-
731 AM CDT SUN MAY 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ADAIR AND
SOUTHWESTERN MADISON COUNTIES IS CANCELLED...

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

LAT...LON 4116 9459 4130 9463 4141 9402 4117 9396
      4115 9421
TIME...MOT...LOC 1231Z 260DEG 25KT 4126 9429

$$

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, 5:52 AM CDTSevere Thunderstorm WarningDMXAudubon, Guthrie53 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, 7:29 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.