Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 65, NWS Des Moines, IA

May 4, 20124 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 4, 2012, 6:00 PM CDT for 4 counties in Iowa. It was in force for 60 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 4, 2012, 6:00 PM CDT (23:00 UTC)
Expired: May 4, 2012, 7:00 PM CDT
In force: 60 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cerro Gordo County, IA, Hancock County, IA, Winnebago County, IA, Worth County, IA

The radar

The Des Moines radar (KDMX), 173 km from the middle of the area, began a volume at 23:01 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
May 4, 6:11 PM CDT	TSTM WND GST 65	5 Nne Lake Mills, IA
May 4, 6:11 PM CDT	TSTM WND GST 65	2 S Emmons, IA
May 4, 6:20 PM CDT	FUNNEL CLOUD	2 Wsw Manly, IA	FUNNEL CLOUD AND 2 TO 3 GUSTNADOES REPORTED. VERY BRIEF WITH ROTATING WALL CLOUD.

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
May 4, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.0 hours before the alert went out and 178 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: 15 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.

550 
WUUS53 KDMX 042300
SVRDMX
IAC033-081-189-195-050000-
/O.NEW.KDMX.SV.W.0065.120504T2300Z-120505T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
600 PM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CERRO GORDO COUNTY IN NORTH CENTRAL IOWA...
  EASTERN HANCOCK COUNTY IN NORTH CENTRAL IOWA...
  EASTERN WINNEBAGO COUNTY IN NORTH CENTRAL IOWA...
  WORTH COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 700 PM CDT

* AT 557 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTH OF LAKE MILLS TO
  FOREST CITY TO 11 MILES WEST OF BELMOND...AND MOVING EAST AT 45
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  MASON CITY...GARNER...CLEAR LAKE...NORTHWOOD...MANLY...ROCKWELL...
  JOICE...KLEMME...FERTILE...GOODELL...HANLONTOWN...VENTURA...MASON
  CITY AIRPORT...MESERVEY...KENSETT...THORNTON...SWALEDALE...
  PLYMOUTH...GRAFTON AND ROCK FALLS.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 178 AND 218.

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 4350 9302 4291 9302 4291 9381 4324 9360
      4351 9353
TIME...MOT...LOC 2300Z 268DEG 40KT 4352 9347 4322 9356
          4290 9378
WIND...HAIL 60MPH 1.00IN

$$

COGIL

4 follow-up statements

083 
WWUS53 KDMX 042321
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
621 PM CDT FRI MAY 4 2012

IAC033-081-189-195-050000-
/O.CON.KDMX.SV.W.0065.000000T0000Z-120505T0000Z/
HANCOCK IA-CERRO GORDO IA-WORTH IA-WINNEBAGO IA-
621 PM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WINNEBAGO...WORTH...CERRO GORDO AND EASTERN HANCOCK COUNTIES UNTIL
700 PM CDT...

AT 616 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF SEVERE
THUNDERSTORMS PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 7 MILES WEST OF NORTHWOOD TO 6 MILES NORTHWEST OF MASON CITY TO
6 MILES NORTHEAST OF BELMOND...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  MASON CITY...MANLY...NORTHWOOD...ROCKWELL...KENSETT...THORNTON...
  SWALEDALE...PLYMOUTH...ROCK FALLS...GRAFTON AND DOUGHERTY.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 178 AND 218.

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.

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 4350 9302 4291 9302 4291 9381 4324 9360
      4351 9353
TIME...MOT...LOC 2321Z 269DEG 41KT 4348 9327 4320 9321
          4291 9346
WIND...HAIL 60MPH 1.00IN

$$

COGIL

592 
WWUS53 KDMX 042327
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
627 PM CDT FRI MAY 4 2012

IAC081-189-042337-
/O.CAN.KDMX.SV.W.0065.000000T0000Z-120505T0000Z/
HANCOCK IA-WINNEBAGO IA-
627 PM CDT FRI MAY 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WINNEBAGO AND EASTERN
HANCOCK COUNTIES IS CANCELLED...

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

LAT...LON 4350 9302 4291 9302 4291 9350 4294 9350
      4325 9343 4351 9346 4351 9345
TIME...MOT...LOC 2327Z 269DEG 41KT 4348 9317 4320 9312
          4291 9337

$$

IAC033-195-050000-
/O.CON.KDMX.SV.W.0065.000000T0000Z-120505T0000Z/
CERRO GORDO IA-WORTH IA-
627 PM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WORTH AND
CERRO GORDO COUNTIES UNTIL 700 PM CDT...

AT 624 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF SEVERE
THUNDERSTORMS PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM NORTHWOOD TO MASON CITY TO 10 MILES WEST OF SHEFFIELD...MOVING
EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  ROCKWELL...ROCK FALLS...GRAFTON AND DOUGHERTY.

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.

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 4350 9302 4291 9302 4291 9350 4294 9350
      4325 9343 4351 9346 4351 9345
TIME...MOT...LOC 2327Z 269DEG 41KT 4348 9317 4320 9312
          4291 9337
WIND...HAIL 60MPH 1.00IN

$$

COGIL

012 
WWUS53 KDMX 042340
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
640 PM CDT FRI MAY 4 2012

IAC033-195-050000-
/O.CON.KDMX.SV.W.0065.000000T0000Z-120505T0000Z/
CERRO GORDO IA-WORTH IA-
640 PM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN WORTH
AND CERRO GORDO COUNTIES UNTIL 700 PM CDT...

AT 636 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM LYLE TO NORA SPRINGS TO
SHEFFIELD...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  DOUGHERTY.

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.

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 4291 9343 4322 9326 4350 9335 4350 9302
      4291 9302
TIME...MOT...LOC 2341Z 269DEG 41KT 4348 9295 4320 9290
          4291 9315
WIND...HAIL 60MPH 1.00IN

$$

COGIL

272 
WWUS53 KDMX 050000
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
700 PM CDT FRI MAY 4 2012

IAC033-195-050010-
/O.EXP.KDMX.SV.W.0065.000000T0000Z-120505T0000Z/
CERRO GORDO IA-WORTH IA-
700 PM CDT FRI MAY 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WORTH AND CERRO GORDO
COUNTIES HAS EXPIRED...

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

LAT...LON 4291 9343 4322 9326 4350 9335 4350 9302
      4291 9302
TIME...MOT...LOC 2340Z 269DEG 41KT 4348 9296 4320 9291
          4291 9317

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:41 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt	28 min
May 3, 11:32 PM CDT	Flash Flood Watch	DMX	Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 8 more	9 hr
May 4, 2:09 AM CDT	Severe Thunderstorm Warning	DMX	Adams, Union	51 min
May 4, 2:13 AM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor	32 min
May 4, 2:45 AM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor	45 min
May 4, 2:54 AM CDT	Severe Thunderstorm Warning	DMX	Adams	51 min
May 4, 3:27 AM CDT	Severe Thunderstorm Warning	DMX	Taylor	48 min
May 4, 5:03 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Monroe	42 min
May 4, 5:44 AM CDT	Flash Flood Warning	DMX	Mahaska, Poweshiek	4 hr
May 4, 4:05 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth	55 min
May 4, 4:22 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	38 min
May 4, 4:40 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	50 min
May 4, 4:46 PM CDT	Tornado Warning	DMX	Palo Alto	29 min
May 4, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth, Palo Alto	46 min
May 4, 5:26 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Winnebago	49 min
May 4, 5:30 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	17 min
May 4, 5:40 PM CDT	Tornado Warning	DMX	Hancock, Humboldt, Kossuth, Wright	35 min
May 4, 5:46 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	15 min
May 4, 6:37 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Webster, Wright	23 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.