Alert archive / Iowa / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 261, NWS Des Moines, IA

July 23, 2011Appanoose County, Wayne County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 23, 2011, 7:08 PM CDT for Appanoose County, Wayne County, Iowa. It was in force for 52 min. 2 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: Jul 23, 2011, 7:08 PM CDT (00:08 UTC)
Expired: Jul 23, 2011, 8:00 PM CDT
In force: 52 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Appanoose County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 129 km from the middle of the area, began a volume at 00:12 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
Jul 23, 7:13 PM CDT	TSTM WND DMG	Seymour, IA	LARGE TREE LIMBS DOWN IN THE TOWN OF SEYMOUR
Jul 23, 7:40 PM CDT	TSTM WND DMG	Cincinnati, IA	PORTION OF TIN ROOF BLEW OFF BUILDING ADJACENT TO KONVENIENCE KORNER GAS STATION...TIME ESTIMATED FROM RADAR

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
Jul 23, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.1 hours before the alert went out and 234 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: 3364 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

987 
WUUS53 KDMX 240008
SVRDMX
IAC007-185-240100-
/O.NEW.KDMX.SV.W.0261.110724T0008Z-110724T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
708 PM CDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN APPANOOSE COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHEASTERN WAYNE COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 800 PM CDT

* AT 707 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
  SEYMOUR...OR 17 MILES WEST OF CENTERVILLE...AND MOVING EAST AT 25
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  CENTERVILLE...SEYMOUR...PROMISE CITY...PLANO...NUMA...CINCINNATI
  AND EXLINE.

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.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED
WARNING. IF A TORNADO IS SPOTTED...IMMEDIATELY MOVE TO THE BASEMENT
OR SMALL INTERIOR ROOM OF A REINFORCED BUILDING.

&&

LAT...LON 4078 9289 4073 9275 4059 9284 4059 9341
      4075 9330
TIME...MOT...LOC 0008Z 270DEG 23KT 4065 9318
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

3 follow-up statements

361 
WWUS53 KDMX 240031
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
731 PM CDT SAT JUL 23 2011

IAC007-185-240100-
/O.CON.KDMX.SV.W.0261.000000T0000Z-110724T0100Z/
WAYNE IA-APPANOOSE IA-
731 PM CDT SAT JUL 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
APPANOOSE AND SOUTHEASTERN WAYNE COUNTIES UNTIL 800 PM CDT...

AT 725 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
SEYMOUR...OR 9 MILES SOUTHWEST OF CENTERVILLE...MOVING EAST AT 20
MPH.

LOCATIONS IMPACTED INCLUDE...
  CENTERVILLE...NUMA...CINCINNATI AND EXLINE.

IN ADDITION...LAW ENFORCEMENT REPORTED LARGE TREE LIMBS DOWN IN THE 
TOWN OF SEYMOUR.

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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN DES MOINES.

&&

LAT...LON 4059 9339 4075 9329 4078 9289 4073 9275
      4059 9284
TIME...MOT...LOC 0030Z 287DEG 18KT 4067 9300
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

457 
WWUS53 KDMX 240047
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
747 PM CDT SAT JUL 23 2011

IAC007-185-240100-
/O.CON.KDMX.SV.W.0261.000000T0000Z-110724T0100Z/
WAYNE IA-APPANOOSE IA-
747 PM CDT SAT JUL 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
APPANOOSE AND SOUTHEASTERN WAYNE COUNTIES UNTIL 800 PM CDT...

AT 744 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 8 MILES
SOUTHWEST OF CENTERVILLE...MOVING SOUTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  EXLINE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN DES MOINES.

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. THIS 
STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. MOVE INDOORS AND STAY 
AWAY FROM WINDOWS. 

&&

LAT...LON 4059 9331 4075 9323 4078 9289 4073 9275
      4059 9284
TIME...MOT...LOC 0047Z 304DEG 19KT 4061 9293
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

050 
WWUS53 KDMX 240101
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
801 PM CDT SAT JUL 23 2011

IAC007-185-240111-
/O.EXP.KDMX.SV.W.0261.000000T0000Z-110724T0100Z/
WAYNE IA-APPANOOSE IA-
801 PM CDT SAT JUL 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN APPANOOSE AND
SOUTHEASTERN WAYNE COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1 AM CDT.

LAT...LON 4059 9331 4075 9323 4078 9289 4073 9275
      4059 9284
TIME...MOT...LOC 0047Z 304DEG 19KT 4061 9293

$$

BEERENDS

Nearby

Severe Thunderstorm Warnings in Iowa, 2011 Every severe thunderstorm warning in 2011

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.