Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 23, NWS Des Moines, IA

April 14, 20126 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 14, 2012, 8:14 PM CDT for 6 counties in Iowa. It was in force for 46 min. 14 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: Apr 14, 2012, 8:14 PM CDT (01:14 UTC)
Expired: Apr 14, 2012, 9:00 PM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Clarke County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 71 km from the middle of the area, began a volume at 01:14 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
Apr 14, 8:21 PM CDT	HAIL 1.75	5 W Chariton Airport, IA
Apr 14, 8:29 PM CDT	TSTM WND DMG	Knoxville, IA	TREES DOWN AND DIME SIZE HAIL REPORTED.
Apr 14, 8:29 PM CDT	HAIL 1	2 E Chariton Airport, IA	QUARTER SIZED HAIL ALONG WITH ESTIMATED 60 MPH WIND GUSTS.
Apr 14, 8:30 PM CDT	TSTM WND DMG	5 Sse Knoxville, IA	GARAGE ATTACHED TO A HOUSE DESTROYED AND PARTIAL ROOF LOSS TO THE HOUSE. DEBRIS FROM THE HOUSE STREWN EASTWARD DOWNWIND OF THE HOUSE FOR OVER 100 YARDS. GARAGE DOOR...WHICH FACED WEST...LOOKS TO HAVE FAILED FIRST AND TOOK THE HOUSE ROOF WITH IT. DAMAGE LIKELY
Apr 14, 8:37 PM CDT	TSTM WND GST 0	3 Ese Chariton Airport, IA	EST. 60 MPH GUSTS WITH NICKEL SIZE HAIL
Apr 14, 8:45 PM CDT	HAIL 0.75	Pella, IA	0.25 TO 0.75 INCH HAIL REPORTED ALONG WITH MINOR STREET FLOODING
Apr 14, 8:45 PM CDT	HAIL 1	N Lovilia, IA	QUARTER SIZE HAIL... PARTIALLY COVERING THE GROUND
Apr 14, 8:49 PM CDT	TSTM WND DMG	5 S Knoxville, IA	ROOF BLOWN OFF HOUSE. GARAGE BLOWN DOWN.
Apr 14, 9:00 PM CDT	HAIL 2.5	4 Sw Eddyville, IA
Apr 14, 9:02 PM CDT	HAIL 1	5 Nw Albia, IA	QUARTER SIZE HAIL
Apr 14, 9:05 PM CDT	HAIL 1.5	Eddyville, IA
Apr 14, 9:07 PM CDT	HAIL 1	2 Nw Oskaloosa, IA	QUARTER SIZE HAIL AND EST. 60 TO 70 MPH WIND GUSTS.
Apr 14, 9:07 PM CDT	HAIL 1.75	1 Nw Eddyville, IA	GOLFBALL SIZE HAIL
Apr 14, 9:10 PM CDT	HAIL 0.75	1 Wnw Oskaloosa, IA	STRONG WINDS REPORTED...NO ESTIMATE ON SPEED.

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
Apr 14, 5:00 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.2 hours before the alert went out and 218 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: 300 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 726 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

213 
WUUS53 KDMX 150114
SVRDMX
IAC039-117-123-125-135-181-150200-
/O.NEW.KDMX.SV.W.0023.120415T0114Z-120415T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
814 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLARKE COUNTY IN SOUTH CENTRAL IOWA...
  LUCAS COUNTY IN SOUTH CENTRAL IOWA...
  MAHASKA COUNTY IN SOUTH CENTRAL IOWA...
  MARION COUNTY IN SOUTH CENTRAL IOWA...
  MONROE COUNTY IN SOUTH CENTRAL IOWA...
  EASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 900 PM CDT

* AT 809 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM PRAIRIE CITY TO 12 MILES
  NORTH OF CHARITON TO 8 MILES SOUTHEAST OF OSCEOLA...AND MOVING EAST
  AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OSKALOOSA...KNOXVILLE...CHARITON...PELLA...NEW SHARON...ALBIA...
  KNOXVILLE AIRPORT...LAKE RED ROCK...WILLIAMSON...DERBY...CHARITON
  AIRPORT...PELLA AIRPORT...HARVEY...MARYSVILLE...BUSSEY...
  LEIGHTON...RUSSELL...HAMILTON...BEACON AND LOVILIA.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 26 AND 39.

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.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO WARNING. IF A
TORNADO IS SPOTTED...IMMEDIATELY MOVE TO THE BASEMENT OR SMALL
INTERIOR ROOM OF A REINFORCED BUILDING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. TURN AROUND DON/T DROWN.

&&

LAT...LON 4130 9250 4116 9262 4116 9264 4113 9264
      4090 9282 4089 9401 4121 9364 4151 9350
      4151 9342 4149 9342 4150 9336 4148 9334
      4151 9332 4151 9249
TIME...MOT...LOC 0114Z 258DEG 32KT 4156 9316 4119 9318
          4093 9364
WIND...HAIL 70MPH 1.00IN

$$

LEE

3 follow-up statements

464 
WWUS53 KDMX 150123
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
823 PM CDT SAT APR 14 2012

IAC039-117-123-125-135-181-150200-
/O.CON.KDMX.SV.W.0023.000000T0000Z-120415T0200Z/
WARREN IA-MONROE IA-MARION IA-MAHASKA IA-LUCAS IA-CLARKE IA-
823 PM CDT SAT APR 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
CLARKE...LUCAS...MAHASKA...MARION...MONROE AND EASTERN WARREN
COUNTIES UNTIL 900 PM CDT...

AT 818 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
TRACK A LINE OF SEVERE THUNDERSTORMS PRODUCING GOLF BALL 
SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM MONROE TO 9 MILES SOUTH OF 
KNOXVILLE TO 11 MILES SOUTHEAST OF OSCEOLA...MOVING EAST AT 35 MPH.  
THIS STORM HAS PRODUCED GOLF BALL SIZE HAIL 5 MILES WEST OF CHARITON.

LOCATIONS IMPACTED INCLUDE...
  OSKALOOSA...CHARITON...PELLA...NEW SHARON...ALBIA...LAKE RED
  ROCK...WILLIAMSON...CHARITON AIRPORT...DERBY...PELLA AIRPORT...
  HARVEY...MARYSVILLE...BUSSEY...LEIGHTON...HAMILTON...RUSSELL...
  BEACON...LOVILIA...UNIVERSITY PARK AND MELROSE.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 26 AND 38.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GO TO A BASEMENT OR SMALL INTERIOR ROOM. COVER YOURSELF. EVACUATE
MOBILE HOMES...AND SEEK SHELTER IN A REINFORCED BUILDING. LARGE WIND
BLOWN HAIL...AND WIDESPREAD DESTRUCTIVE WINDS CAN CAUSE EXTENSIVE
DAMAGE AND SERIOUS INJURY JUST LIKE A TORNADO.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... IMMEDIATELY MOVE TO THE BASEMENT OR SMALL INTERIOR ROOM
OF A REINFORCED BUILDING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. TURN AROUND DON/T DROWN.

&&

LAT...LON 4130 9250 4116 9262 4116 9264 4113 9264
      4090 9282 4089 9401 4121 9364 4151 9350
      4151 9342 4149 9342 4150 9336 4148 9334
      4151 9332 4151 9249
TIME...MOT...LOC 0123Z 258DEG 32KT 4158 9305 4121 9307
          4095 9353
WIND...HAIL 70MPH 1.75IN

$$

LEE

376 
WWUS53 KDMX 150135
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
835 PM CDT SAT APR 14 2012

IAC039-181-150142-
/O.CAN.KDMX.SV.W.0023.000000T0000Z-120415T0200Z/
WARREN IA-CLARKE IA-
835 PM CDT SAT APR 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLARKE AND
EASTERN WARREN COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4130 9250 4116 9262 4116 9264 4113 9264
      4090 9282 4090 9355 4107 9356 4116 9347
      4116 9333 4132 9333 4151 9323 4151 9249
TIME...MOT...LOC 0132Z 258DEG 32KT 4160 9294 4123 9296
          4097 9342

$$

IAC117-123-125-135-150200-
/O.CON.KDMX.SV.W.0023.000000T0000Z-120415T0200Z/
MONROE IA-MARION IA-MAHASKA IA-LUCAS IA-
835 PM CDT SAT APR 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LUCAS...
MAHASKA...MARION AND MONROE COUNTIES UNTIL 900 PM CDT...

AT 827 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE 
TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF 
BALL SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTHEAST OF 
MONROE TO 8 MILES SOUTHEAST OF KNOXVILLE TO 10 MILES SOUTHWEST OF 
CHARITON...MOVING EAST AT 35 MPH.  THESE STORMS HAVE HAD A HISTORY 
OF PRODUCING 1.25 INCH HAIL 5 MILES SOUTH OF MELCHER-DALLAS AND WIND 
DAMAGE ACROSS PORTIONS OF KNOXVILLE.

LOCATIONS IMPACTED INCLUDE...
  OSKALOOSA...PELLA...CHARITON...NEW SHARON...ALBIA...PELLA
  AIRPORT...HARVEY...MARYSVILLE...BUSSEY...LEIGHTON...RUSSELL...
  HAMILTON...BEACON...LOVILIA...UNIVERSITY PARK...MELROSE AND KEOMAH
  VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GO TO A BASEMENT OR SMALL INTERIOR ROOM. COVER YOURSELF. EVACUATE
MOBILE HOMES...AND SEEK SHELTER IN A REINFORCED BUILDING. LARGE WIND
BLOWN HAIL...AND WIDESPREAD DESTRUCTIVE WINDS CAN CAUSE EXTENSIVE
DAMAGE AND SERIOUS INJURY JUST LIKE A TORNADO.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... IMMEDIATELY MOVE TO THE BASEMENT OR SMALL INTERIOR ROOM
OF A REINFORCED BUILDING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. TURN AROUND DON/T DROWN.

&&

LAT...LON 4130 9250 4116 9262 4116 9264 4113 9264
      4090 9282 4090 9355 4107 9356 4116 9347
      4116 9333 4132 9333 4151 9323 4151 9249
TIME...MOT...LOC 0132Z 258DEG 32KT 4160 9294 4123 9296
          4097 9342
WIND...HAIL 70MPH 1.75IN

$$

LEE

811 
WWUS53 KDMX 150153
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
853 PM CDT SAT APR 14 2012

IAC117-123-125-135-150200-
/O.CON.KDMX.SV.W.0023.000000T0000Z-120415T0200Z/
MONROE IA-MARION IA-MAHASKA IA-LUCAS IA-
853 PM CDT SAT APR 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
LUCAS...MAHASKA...SOUTHEASTERN MARION AND MONROE COUNTIES UNTIL 900
PM CDT...

AT 850 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 7 MILES SOUTH OF GRINNELL TO 6
MILES WEST OF OSKALOOSA TO 5 MILES EAST OF CHARITON...MOVING EAST AT
35 MPH.

LOCATIONS IMPACTED INCLUDE...
  OSKALOOSA...NEW SHARON...ALBIA...BEACON...LOVILIA...UNIVERSITY
  PARK...MELROSE AND KEOMAH VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GO TO A BASEMENT OR SMALL INTERIOR ROOM. COVER YOURSELF. EVACUATE
MOBILE HOMES...AND SEEK SHELTER IN A REINFORCED BUILDING. LARGE WIND
BLOWN HAIL...AND WIDESPREAD DESTRUCTIVE WINDS CAN CAUSE EXTENSIVE
DAMAGE AND SERIOUS INJURY JUST LIKE A TORNADO.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... IMMEDIATELY MOVE TO THE BASEMENT OR SMALL INTERIOR ROOM
OF A REINFORCED BUILDING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. TURN AROUND DON/T DROWN.

&&

LAT...LON 4130 9250 4116 9262 4116 9264 4113 9264
      4090 9282 4099 9332 4126 9301 4151 9284
      4151 9249
TIME...MOT...LOC 0153Z 258DEG 32KT 4164 9269 4127 9272
          4101 9318
WIND...HAIL 70MPH 1.75IN

$$

LEE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 7:07 PM CDT	Flash Flood Warning	DMX	Adair, Madison	101 min
Apr 14, 7:11 PM CDT	Tornado Warning	DMX	Madison, Union	19 min
Apr 14, 7:26 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Marion, Union, Warren	49 min
Apr 14, 7:30 PM CDT	Flash Flood Warning	DMX	Adair, Dallas, Guthrie, Madison, Polk, Warren	3 hr
Apr 14, 7:32 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Jasper, Madison, Marion, Polk, Warren	43 min
Apr 14, 7:37 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Jasper, Polk, Story	38 min
Apr 14, 7:37 PM CDT	Tornado Warning	DMX	Clarke, Madison, Warren	23 min
Apr 14, 8:10 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Polk, Story	50 min
Apr 14, 8:33 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	57 min
Apr 14, 8:43 PM CDT	Flash Flood Warning	DMX	Marshall, Tama	84 min
Apr 14, 8:55 PM CDT	Flash Flood Warning	DMX	Clarke, Decatur, Lucas, Marion, Monroe, Ringgold and 2 more	103 min
Apr 14, 8:56 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Mahaska, Marion, Monroe, Wapello	49 min
Apr 14, 9:21 PM CDT	Tornado Warning	DMX	Mahaska	24 min
Apr 14, 9:42 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	16 min
Apr 14, 10:25 PM CDT	Flash Flood Watch	DMX	Adair, Adams, Audubon, Cass, Clarke, Dallas and 7 more	7 hr
Apr 15, 4:15 AM CDT	High Wind Warning	DMX	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 19 more	16 hr
Apr 15, 4:15 AM CDT	Wind Advisory	DMX	Appanoose, Black Hawk, Boone, Bremer, Butler, Calhoun and 29 more	33 hr

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.