Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 101, NWS Des Moines, IA

June 10, 2012Audubon County, Cass County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 10, 2012, 8:05 PM CDT for Audubon County, Cass County, Iowa. It was in force for 40 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: Jun 10, 2012, 8:05 PM CDT (01:05 UTC)
Expired: Jun 10, 2012, 8:45 PM CDT
In force: 40 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Audubon County, IA, Cass County, IA

The radar

The Des Moines radar (KDMX), 98 km from the middle of the area, began a volume at 01:07 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

Time	Report	Where	Remark
Jun 10, 8:06 PM CDT	TSTM WND DMG	5 N Atlantic, IA	LARGE TREE TOPPLED OVER POWER LINES ALONG OLIVE STREET SOUTH OF INTERSTATE 80.

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.

Issued	Product	Office	Lasted
Jun 10, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.1 hours before the alert went out and 127 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 863 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1243 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 8.5

Open this sounding in Storm Lab

The text

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

672 
WUUS53 KDMX 110105
SVRDMX
IAC009-029-110145-
/O.NEW.KDMX.SV.W.0101.120611T0105Z-120611T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
805 PM CDT SUN JUN 10 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN AUDUBON COUNTY IN WEST CENTRAL IOWA...
  NORTHEASTERN CASS COUNTY IN SOUTHWEST IOWA...

* UNTIL 845 PM CDT

* AT 803 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
  ELK HORN...OR 10 MILES NORTH OF ATLANTIC...AND MOVING EAST AT 40
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  AUDUBON...BRAYTON...EXIRA...AUDUBON AIRPORT AND ANITA.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 55 AND 73.

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 4176 9474 4161 9474 4160 9471 4159 9471
      4143 9470 4143 9505 4150 9506 4151 9505
      4159 9505 4160 9507 4169 9508
TIME...MOT...LOC 0105Z 253DEG 34KT 4155 9499
WIND...HAIL 60MPH 1.00IN

$$

JUNGBLUTH

2 follow-up statements

029 
WWUS53 KDMX 110129
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
829 PM CDT SUN JUN 10 2012

IAC029-110137-
/O.CAN.KDMX.SV.W.0101.000000T0000Z-120611T0145Z/
CASS IA-
829 PM CDT SUN JUN 10 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CASS COUNTY IS
CANCELLED...

THE STORM HAS WEAKENED OVER CASS COUNTY...BUT ADDITIONAL 
THUNDERSTORMS WILL MOVE THROUGH OVER THE NEXT HOUR.

LAT...LON 4176 9474 4161 9474 4160 9471 4151 9471
      4151 9493 4172 9494
TIME...MOT...LOC 0127Z 255DEG 28KT 4162 9479

$$

IAC009-110145-
/O.CON.KDMX.SV.W.0101.000000T0000Z-120611T0145Z/
AUDUBON IA-
829 PM CDT SUN JUN 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
AUDUBON COUNTY UNTIL 845 PM CDT...

AT 825 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 9 MILES SOUTHEAST OF AUDUBON...OR 18
MILES NORTHEAST OF ATLANTIC...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EASTERN AUDUBON COUNTY.

SPOTTERS REPORTED PEA SIZE HAIL AND STRONG WINDS AT 825 PM IN 
EXIRA...BUT NO DAMAGE WAS REPORTED.

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...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4176 9474 4161 9474 4160 9471 4151 9471
      4151 9493 4172 9494
TIME...MOT...LOC 0127Z 255DEG 28KT 4162 9479
WIND...HAIL 60MPH <.75IN

$$

JUNGBLUTH

915 
WWUS53 KDMX 110145
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
845 PM CDT SUN JUN 10 2012

IAC009-110155-
/O.EXP.KDMX.SV.W.0101.000000T0000Z-120611T0145Z/
AUDUBON IA-
845 PM CDT SUN JUN 10 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN AUDUBON COUNTY
HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11 PM.

LAT...LON 4176 9474 4161 9474 4160 9471 4151 9471
      4151 9493 4172 9494
TIME...MOT...LOC 0145Z 255DEG 28KT 4165 9461

$$

JUNGBLUTH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 9:34 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	41 min
Jun 10, 9:37 PM CDT	Severe Thunderstorm Warning	DMX	Adair	38 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012 Every 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.