Alert archive / Iowa / Tornado Warnings in 2014

Tornado Warning 12, NWS Quad Cities, IA

May 11, 2014Lee County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 11, 2014, 4:26 PM CDT for Lee County, Iowa. It was in force for 34 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 11, 2014, 4:26 PM CDT (21:26 UTC)
Expired: May 11, 2014, 5:00 PM CDT
In force: 34 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 1.75 in

County Lee County, IA

The radar

The Quad Cities radar (KDVN), 120 km from the middle of the area, began a volume at 21:26 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
May 11, 4:52 PM CDT	HAIL 0.5	3 S Denmark, IA
May 11, 4:56 PM CDT	HAIL 0.5	3 W Wever, IA
May 11, 4:56 PM CDT	HAIL 1.5	3 W Wever, 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 11, 11:53 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 125 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.

379 
WFUS53 KDVN 112126
TORDVN
IAC111-112200-
/O.NEW.KDVN.TO.W.0012.140511T2126Z-140511T2200Z/

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

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  LEE COUNTY IN SOUTHEAST IOWA...

* UNTIL 500 PM CDT

* AT 422 PM CDT...A CONFIRMED TORNADO WAS LOCATED NEAR DONNELLSON...
  AND MOVING NORTHEAST AT 20 MPH.

  HAZARD...DAMAGING TORNADO AND GOLF BALL SIZE HAIL.

  SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.

  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.

* THE TORNADO WILL BE NEAR...
  FRANKLIN AROUND 435 PM CDT.
  WEST POINT AND FORT MADISON AROUND 450 PM CDT.
  DENMARK AROUND 500 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE SAWYER...FORT MADISON
MUNICIPAL ARPT AND SOUTH AUGUSTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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.

&&

LAT...LON 4063 9171 4081 9146 4081 9140 4079 9137
      4080 9135 4077 9131 4077 9130 4076 9128
      4075 9125 4070 9119 4051 9157
TIME...MOT...LOC 2127Z 232DEG 19KT 4062 9154

TORNADO...OBSERVED
HAIL...1.75IN

$$

MCCLURE

2 follow-up statements

204 
WWUS53 KDVN 112134
SVSDVN

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

IAC111-112200-
/O.CON.KDVN.TO.W.0012.000000T0000Z-140511T2200Z/
LEE IA-
434 PM CDT SUN MAY 11 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR LEE COUNTY UNTIL 500 PM
CDT...

AT 430 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR DONNELLSON...AND MOVING NORTHEAST AT 20 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...
  WEST POINT AND FORT MADISON AROUND 450 PM CDT.
  DENMARK AROUND 500 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE FORT MADISON MUNICIPAL ARPT...
SAWYER AND SOUTH AUGUSTA.

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.

THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. TAKE COVER IN A
BASEMENT OR STORM SHELTER NOW!

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 4070 9161 4081 9146 4081 9140 4079 9137
      4080 9135 4076 9128 4075 9125 4070 9119
      4052 9154
TIME...MOT...LOC 2134Z 232DEG 19KT 4064 9150

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

$$

MCCLURE

513 
WWUS53 KDVN 112151
SVSDVN

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

IAC111-112200-
/O.CON.KDVN.TO.W.0012.000000T0000Z-140511T2200Z/
LEE IA-
451 PM CDT SUN MAY 11 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN LEE COUNTY
UNTIL 500 PM CDT...

AT 448 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR WEST POINT...AND MOVING NORTHEAST AT 20 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...
  DENMARK AROUND 500 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE SAWYER...FORT MADISON
MUNICIPAL ARPT AND SOUTH AUGUSTA.

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.

THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. TAKE COVER IN A
BASEMENT OR STORM SHELTER NOW!

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 4073 9151 4081 9146 4081 9140 4079 9137
      4080 9135 4077 9131 4076 9128 4075 9125
      4070 9119 4059 9142
TIME...MOT...LOC 2152Z 230DEG 18KT 4068 9141

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

$$

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, 3:32 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Washington	28 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, 4:46 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.