Alert archive / Iowa / Tornado Warnings in 2014

Tornado Warning 11, NWS Quad Cities, IA

May 11, 2014Henry County, Jefferson County, Washington County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 11, 2014, 3:32 PM CDT for Henry County, Jefferson County, Washington County, Iowa. It was in force for 28 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 11, 2014, 3:32 PM CDT (20:32 UTC)
Expired: May 11, 2014, 4:00 PM CDT
In force: 28 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

Counties Henry County, IA, Jefferson County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 20:34 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, 3:47 PM CDT	HAIL 1.75	Brighton, IA	GOLF BALL HAIL FALLING FOR THE PAST 4 MINUTES AND STILL FALLING.

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, 11:53 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.5 hours before the alert went out and 121 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: 52 J/kg
Mixed-layer CIN: -261 J/kg
Mixed-layer LCL: 1382 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 162 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.

404 
WFUS53 KDVN 112032
TORDVN
IAC087-101-183-112100-
/O.NEW.KDVN.TO.W.0011.140511T2032Z-140511T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
332 PM CDT SUN MAY 11 2014

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN HENRY COUNTY IN SOUTHEAST IOWA...
  NORTHEASTERN JEFFERSON COUNTY IN SOUTHEAST IOWA...
  SOUTHERN WASHINGTON COUNTY IN SOUTHEAST IOWA...

* UNTIL 400 PM CDT

* AT 330 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR PLEASANT PLAIN...AND MOVING EAST AT 30
  MPH.

  HAZARD...TORNADO AND GOLF BALL SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
           ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS
           WILL BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS
           LIKELY.

* THIS DANGEROUS STORM WILL BE NEAR...
  BRIGHTON AROUND 340 PM CDT.
  COPPOCK AROUND 350 PM CDT.
  WAYLAND AROUND 355 PM CDT.
  OLDS AND CRAWFORDSVILLE AROUND 400 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE GERMANVILLE...MERRIMAC...NOBLE
AND SWEDESBURG.

OTHER LOCATIONS AFFECTED INCLUDE BRINTON TIMBER PARK AND MARR PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE
QUAD CITIES.

&&

LAT...LON 4117 9194 4123 9194 4131 9156 4111 9150
      4105 9194 4116 9197
TIME...MOT...LOC 2032Z 256DEG 24KT 4111 9185

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

MCCLURE

3 follow-up statements

600 
WWUS53 KDVN 112042
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
342 PM CDT SUN MAY 11 2014

IAC087-101-183-112100-
/O.CON.KDVN.TO.W.0011.000000T0000Z-140511T2100Z/
WASHINGTON IA-JEFFERSON IA-HENRY IA-
342 PM CDT SUN MAY 11 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN HENRY...
NORTHEASTERN JEFFERSON AND SOUTHERN WASHINGTON COUNTIES UNTIL 400 PM
CDT...

AT 339 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR BRIGHTON...AND MOVING EAST AT 30 MPH.

HAZARD...TORNADO AND GOLF BALL SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
         ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS WILL
         BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...
  COPPOCK AROUND 350 PM CDT.
  WAYLAND AROUND 355 PM CDT.
  OLDS AND CRAWFORDSVILLE AROUND 400 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE NOBLE AND SWEDESBURG.

OTHER LOCATIONS AFFECTED INCLUDE MARR PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE
QUAD CITIES.

&&

LAT...LON 4106 9188 4114 9191 4121 9193 4131 9156
      4111 9150
TIME...MOT...LOC 2041Z 256DEG 24KT 4112 9177

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

MCCLURE

289 
WWUS53 KDVN 112050
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
350 PM CDT SUN MAY 11 2014

IAC087-101-183-112100-
/O.CON.KDVN.TO.W.0011.000000T0000Z-140511T2100Z/
WASHINGTON IA-JEFFERSON IA-HENRY IA-
350 PM CDT SUN MAY 11 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN HENRY...
NORTHEASTERN JEFFERSON AND SOUTHERN WASHINGTON COUNTIES UNTIL 400 PM
CDT...

AT 347 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR COPPOCK...AND MOVING EAST AT 25 MPH.

HAZARD...TORNADO AND GOLF BALL SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
         ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS WILL
         BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...
  WAYLAND AND OLDS AROUND 400 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE NOBLE AND SWEDESBURG.

OTHER LOCATIONS AFFECTED INCLUDE MARR PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE
QUAD CITIES.

&&

LAT...LON 4106 9186 4114 9188 4122 9190 4131 9156
      4111 9150
TIME...MOT...LOC 2050Z 262DEG 22KT 4112 9173

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

MCCLURE

515 
WWUS53 KDVN 112057
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
357 PM CDT SUN MAY 11 2014

IAC087-101-183-112108-
/O.EXP.KDVN.TO.W.0011.000000T0000Z-140511T2100Z/
WASHINGTON IA-JEFFERSON IA-HENRY IA-
357 PM CDT SUN MAY 11 2014

...THE TORNADO WARNING FOR NORTHWESTERN HENRY...NORTHEASTERN
JEFFERSON AND SOUTHERN WASHINGTON COUNTIES WILL EXPIRE AT 400 PM
CDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT
FOR THE AREA.

LAT...LON 4106 9186 4114 9188 4122 9190 4131 9156
      4111 9150
TIME...MOT...LOC 2058Z 262DEG 22KT 4113 9167

$$

MCCLURE

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 11, 2:24 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	51 min
May 11, 2:55 PM CDT	Tornado Warning	DVN	Jefferson, Keokuk	35 min
May 11, 3:11 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	64 min
May 11, 3:25 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Washington	50 min
May 11, 3:36 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	39 min
May 11, 4:13 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Louisa, Washington	62 min
May 11, 4:14 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee	61 min
May 11, 4:18 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Van Buren	42 min
May 11, 4:26 PM CDT	Tornado Warning Tornado observed	DVN	Lee	34 min
May 11, 4:46 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Louisa	59 min
May 11, 5:32 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Louisa	58 min
May 11, 5:39 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	66 min

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.