Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 71, NWS Des Moines, IA

May 5, 2012Cerro Gordo County, Winnebago County, Worth County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 5, 2012, 2:54 PM CDT for Cerro Gordo County, Winnebago County, Worth County, Iowa. It was in force for 66 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 5, 2012, 2:54 PM CDT (19:54 UTC)
Expired: May 5, 2012, 4:00 PM CDT
In force: 66 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Minneapolis radar (KMPX), 174 km from the middle of the area, began a volume at 19:55 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 5, 3:44 PM CDT	HAIL 1	5 Ne Mason City, IA

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 5, 11:38 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 7.9 hours before the alert went out and 174 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: 480 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

332 
WUUS53 KDMX 051954
SVRDMX
IAC033-189-195-052100-
/O.NEW.KDMX.SV.W.0071.120505T1954Z-120505T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
254 PM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

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

* UNTIL 400 PM CDT

* AT 252 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
  LAKE MILLS...OR 24 MILES NORTHWEST OF MASON CITY...AND MOVING EAST
  AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NORTHWOOD...MANLY...JOICE...FERTILE...HANLONTOWN...KENSETT...
  PLYMOUTH...GRAFTON AND ROCK FALLS.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 200 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.

&&

LAT...LON 4316 9302 4325 9350 4326 9350 4326 9354
      4327 9361 4350 9356 4350 9302
TIME...MOT...LOC 1954Z 277DEG 32KT 4340 9352
WIND...HAIL 60MPH 1.00IN

$$

SKOW

4 follow-up statements

462 
WWUS53 KDMX 052016
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
316 PM CDT SAT MAY 5 2012

IAC189-052026-
/O.CAN.KDMX.SV.W.0071.000000T0000Z-120505T2100Z/
WINNEBAGO IA-
316 PM CDT SAT MAY 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WINNEBAGO COUNTY IS
CANCELLED...

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

LAT...LON 4350 9302 4316 9302 4325 9350 4339 9350
      4350 9339
TIME...MOT...LOC 2016Z 283DEG 26KT 4351 9309 4334 9324
          4324 9346

$$

IAC033-195-052100-
/O.CON.KDMX.SV.W.0071.000000T0000Z-120505T2100Z/
CERRO GORDO IA-WORTH IA-
316 PM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WORTH AND
NORTHERN CERRO GORDO COUNTIES UNTIL 400 PM CDT...

AT 313 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 NORTHEAST OF NORTHWOOD TO
5 MILES NORTHWEST OF MANLY TO 7 MILES EAST OF FOREST CITY...MOVING
EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  MANLY...KENSETT...GRAFTON...PLYMOUTH AND ROCK FALLS.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 200 AND 218.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL...DAMAGING WINDS AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4350 9302 4316 9302 4325 9350 4339 9350
      4350 9339
TIME...MOT...LOC 2016Z 283DEG 26KT 4351 9309 4334 9324
          4324 9346
WIND...HAIL 60MPH 1.00IN

$$

COGIL

627 
WWUS53 KDMX 052035
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
335 PM CDT SAT MAY 5 2012

IAC033-195-052100-
/O.CON.KDMX.SV.W.0071.000000T0000Z-120505T2100Z/
CERRO GORDO IA-WORTH IA-
335 PM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN WORTH
AND NORTHEASTERN CERRO GORDO COUNTIES UNTIL 400 PM CDT...

AT 333 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 5 MILES WEST OF LYLE TO 6 MILES
EAST OF MANLY TO MASON CITY...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  PLYMOUTH AND ROCK FALLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL...DAMAGING WINDS AND DEADLY CLOUD TO GROUND
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4339 9318 4350 9311 4350 9302 4316 9302
      4322 9333
TIME...MOT...LOC 2035Z 286DEG 30KT 4347 9302 4332 9306
          4320 9321
WIND...HAIL 60MPH 1.00IN

$$

COGIL

062 
WWUS53 KDMX 052045
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
345 PM CDT SAT MAY 5 2012

IAC033-195-052100-
/O.CON.KDMX.SV.W.0071.000000T0000Z-120505T2100Z/
CERRO GORDO IA-WORTH IA-
345 PM CDT SAT MAY 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WORTH AND NORTHEASTERN CERRO GORDO COUNTIES UNTIL 400 PM CDT...

AT 344 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED 6
MILES NORTHWEST OF NORA SPRINGS...OR 7 MILES NORTHEAST OF MASON
CITY...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN CERRO GORDO COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4326 9314 4332 9303 4322 9302 4316 9302
      4320 9321
TIME...MOT...LOC 2045Z 288DEG 31KT 4320 9308
WIND...HAIL <50MPH 1.00IN

$$

COGIL

140 
WWUS53 KDMX 052057
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
357 PM CDT SAT MAY 5 2012

IAC033-195-052107-
/O.EXP.KDMX.SV.W.0071.000000T0000Z-120505T2100Z/
CERRO GORDO IA-WORTH IA-
357 PM CDT SAT MAY 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WORTH AND
NORTHEASTERN CERRO GORDO COUNTIES WILL EXPIRE AT 400 PM CDT...

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

LAT...LON 4326 9314 4332 9303 4322 9302 4316 9302
      4320 9321
TIME...MOT...LOC 2057Z 288DEG 31KT 4317 9295

$$

COGIL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 10:27 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto, Pocahontas	48 min
May 5, 2:31 AM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford	33 min
May 5, 1:57 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	33 min
May 5, 2:28 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago	32 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.