Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 55, NWS Des Moines, IA

May 4, 2012Adams County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 4, 2012, 2:54 AM CDT for Adams County, Iowa. It was in force for 51 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: May 4, 2012, 2:54 AM CDT (07:54 UTC)
Expired: May 4, 2012, 3:45 AM CDT
In force: 51 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Adams County, IA

The radar

The Des Moines radar (KDMX), 119 km from the middle of the area, began a volume at 07:55 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 4, 3:00 AM CDT	HAIL 0.88	Prescott, IA	TIME ESTIMATED.
May 4, 3:03 AM CDT	HAIL 1.25	5 Ese Corning, IA	TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.9 hours before the alert went out and 142 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: 2202 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1397 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

678 
WUUS53 KDMX 040754
SVRDMX
IAC003-040845-
/O.NEW.KDMX.SV.W.0055.120504T0754Z-120504T0845Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ADAMS COUNTY IN SOUTHWEST IOWA...

* UNTIL 345 AM CDT

* AT 250 AM 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   
  CORNING...OR 15 MILES WEST OF CRESTON...AND WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...
  PRESCOTT.

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.

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

&&

LAT...LON 4090 9492 4109 9491 4111 9447 4090 9448
TIME...MOT...LOC 0754Z 288DEG 4KT 4099 9464
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

3 follow-up statements

339 
WWUS53 KDMX 040816
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
316 AM CDT FRI MAY 4 2012

IAC003-040845-
/O.CON.KDMX.SV.W.0055.000000T0000Z-120504T0845Z/
ADAMS IA-
316 AM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ADAMS COUNTY
UNTIL 345 AM CDT...

AT 312 AM 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 7 MILES
NORTH OF LENOX...OR 14 MILES SOUTHWEST OF CRESTON...MOVING EAST AT 10
MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHEASTERN ADAMS COUNTY.

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.

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

&&

LAT...LON 4090 9492 4109 9491 4111 9447 4090 9448
TIME...MOT...LOC 0816Z 288DEG 8KT 4097 9459
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

152 
WWUS53 KDMX 040822
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
322 AM CDT FRI MAY 4 2012

IAC003-040845-
/O.CON.KDMX.SV.W.0055.000000T0000Z-120504T0845Z/
ADAMS IA-
322 AM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ADAMS
COUNTY UNTIL 345 AM CDT...

AT 317 AM 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
LENOX...OR 13 MILES SOUTHWEST OF CRESTON...MOVING SOUTHEAST AT 20
MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHEASTERN ADAMS COUNTY.

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 4090 9492 4096 9485 4106 9447 4090 9448
      4090 9482
TIME...MOT...LOC 0822Z 301DEG 15KT 4094 9454
WIND...HAIL 60MPH 1.00IN

$$

BEERENDS

522 
WWUS53 KDMX 040842
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
342 AM CDT FRI MAY 4 2012

IAC003-040852-
/O.EXP.KDMX.SV.W.0055.000000T0000Z-120504T0845Z/
ADAMS IA-
342 AM CDT FRI MAY 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ADAMS COUNTY WILL
EXPIRE AT 345 AM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.  HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4090 9492 4096 9485 4106 9447 4090 9448
      4090 9482
TIME...MOT...LOC 0842Z 301DEG 15KT 4090 9445

$$

BEERENDS

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, 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, 6:00 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	60 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.