Alert archive / Iowa / Tornado Warnings in 2014

Tornado Warning 10, NWS Des Moines, IA

May 11, 20144 counties in Iowa

NWS Des Moines, IA issued this tornado warning at May 11, 2014, 9:59 PM CDT for 4 counties in Iowa. It was in force for 46 min. 4 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 11, 2014, 9:59 PM CDT (02:59 UTC)
Expired: May 11, 2014, 10:45 PM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Boone County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 48 km from the middle of the area, began a volume at 03:02 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 11, 10:02 PM CDT	TSTM WND DMG	3 S Yale, IA	2 OR 3 LARGE TELEPHONE POLES SNAPPED IN HALF ALONG WITH A LARGE TREE DOWN ABOUT FOOT AND A HALF IN DIAMETER. TIME ESTIMATED BY RADAR.
May 11, 10:08 PM CDT	TSTM WND DMG	1 E Yale, IA	LARGE BRANCHES SNAPPED OFF A HEALTHY TREE. TIME ESTIMATED BY RADAR
May 11, 10:08 PM CDT	TORNADO	3 Ene Yale, IA	END POINT OF LAKE PANORAMA EF2 TORNADO.
May 11, 10:38 PM CDT	TSTM WND DMG	3 Ne Yale, IA	LARGE TREE SNAPPED IN HALF. TREE LIMBS DOWN.

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 11, 7:49 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.0 hours before the alert went out and 181 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: 2520 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 4.5
Supercell composite: 18.8

Open this sounding in Storm Lab

The text

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

085 
WFUS53 KDMX 120259
TORDMX
IAC015-049-073-077-120345-
/O.NEW.KDMX.TO.W.0010.140512T0259Z-140512T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
959 PM CDT SUN MAY 11 2014

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN BOONE COUNTY IN CENTRAL IOWA...
  NORTHWESTERN DALLAS COUNTY IN CENTRAL IOWA...
  NORTHEASTERN GUTHRIE COUNTY IN WEST CENTRAL IOWA...
  SOUTHEASTERN GREENE COUNTY IN WEST CENTRAL IOWA...

* UNTIL 1045 PM CDT
    
* AT 959 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER LAKE PANORAMA...OR 7 MILES NORTHEAST OF
  GUTHRIE CENTER...MOVING NORTHEAST AT 40 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  PERRY...PANORA...LAKE PANORAMA...GRAND JUNCTION...RIPPEY...YALE...
  JAMAICA...DAWSON...BERKLEY...LAKIN SLOUGH GAME MANAGEMENT AREA...
  SPRINGBROOK STATE PARK AND PERRY MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4168 9438 4175 9449 4204 9424 4187 9400
TIME...MOT...LOC 0259Z 224DEG 35KT 4174 9439 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SMALL

2 follow-up statements

373 
WWUS53 KDMX 120316
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1016 PM CDT SUN MAY 11 2014

IAC077-120326-
/O.CAN.KDMX.TO.W.0010.000000T0000Z-140512T0345Z/
GUTHRIE IA-

1016 PM CDT SUN MAY 11 2014

...THE TORNADO WARNING FOR NORTHEASTERN GUTHRIE COUNTY IS
CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT 
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY MORNING FOR
IOWA.

LAT...LON 4202 9421 4187 9400 4177 9428 4186 9428
      4186 9430
TIME...MOT...LOC 0316Z 226DEG 33KT 4184 9425 

$$

IAC015-049-073-120345-
/O.CON.KDMX.TO.W.0010.000000T0000Z-140512T0345Z/
BOONE IA-DALLAS IA-GREENE IA-
1016 PM CDT SUN MAY 11 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR
SOUTHWESTERN BOONE...NORTHWESTERN DALLAS AND SOUTHEASTERN GREENE
COUNTIES...
    
AT 1016 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 7 MILES WEST OF PERRY...MOVING NORTHEAST AT 40 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

THIS DANGEROUS STORM WILL BE NEAR...
  PERRY AROUND 1025 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BERKLEY...DAWSON...RIPPEY AND PERRY MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4202 9421 4187 9400 4177 9428 4186 9428
      4186 9430
TIME...MOT...LOC 0316Z 226DEG 33KT 4184 9425 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SMALL

460 
WWUS53 KDMX 120329
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1029 PM CDT SUN MAY 11 2014

IAC015-049-073-120338-
/O.CAN.KDMX.TO.W.0010.000000T0000Z-140512T0345Z/
BOONE IA-DALLAS IA-GREENE IA-
1029 PM CDT SUN MAY 11 2014

...THE TORNADO WARNING FOR SOUTHWESTERN BOONE...NORTHWESTERN DALLAS
AND SOUTHEASTERN GREENE COUNTIES IS CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT MONDAY MORNING FOR
IOWA.

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR 
THE WARNED AREA UNTIL 1100 PM.

LAT...LON 4202 9421 4187 9400 4177 9428 4186 9428
      4186 9430
TIME...MOT...LOC 0325Z 224DEG 35KT 4193 9413 

$$

SMALL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:58 PM CDT	Special Weather Statement	DMX	Adair, Audubon, Carroll, Cass, Crawford, Guthrie	2 hr
May 11, 8:08 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth	37 min
May 11, 8:24 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Cass, Crawford	66 min
May 11, 9:05 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	40 min
May 11, 9:15 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Greene, Sac	45 min
May 11, 9:21 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Carroll, Dallas, Greene, Guthrie	39 min
May 11, 9:30 PM CDT	Flash Flood Warning	DMX	Audubon, Carroll, Cass, Crawford	6 hr
May 11, 9:45 PM CDT	Tornado Warning	DMX	Dallas, Guthrie	30 min
May 11, 10:03 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Boone, Dallas, Greene, Guthrie, Hamilton and 6 more	57 min
May 11, 10:26 PM CDT	Tornado Warning	DMX	Dallas, Polk, Story	34 min
May 11, 10:45 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Cass	45 min
May 11, 10:47 PM CDT	Tornado Warning	DMX	Boone, Hamilton, Story	28 min
May 11, 10:55 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Jasper, Marion, Marshall and 3 more	65 min
May 11, 11:13 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass, Union	47 min
May 12, 12:31 AM CDT	Flash Flood Warning	DMX	Adair	6 hr
May 12, 12:47 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Ringgold, Union	43 min
May 12, 1:32 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	43 min
May 12, 3:05 AM CDT	Special Weather Statement	DMX	Carroll	25 min
May 12, 4:45 AM CDT	Special Weather Statement	DMX	Hardin	30 min
May 12, 9:34 AM CDT	Special Weather Statement	DMX	Mahaska, Monroe, Wayne	56 min
May 12, 10:34 AM CDT	Flash Flood Watch	DMX	Appanoose, Black Hawk, Bremer, Butler, Clarke, Davis and 14 more	7 hr
May 12, 1:39 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Wayne	36 min
May 12, 2:47 PM CDT	Flash Flood Warning	DMX	Lucas	6 hr
May 12, 3:14 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Monroe, Poweshiek, Wapello	46 min
May 12, 3:36 PM CDT	Severe Thunderstorm Warning	DMX	Davis	39 min
May 12, 4:18 PM CDT	Flash Flood Warning	DMX	Marion, Monroe	6 hr

Nearby

Tornado Warnings in Iowa, 2014 Every tornado warning in 2014 Tornadoes in 2014

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.