Alert archive / Iowa / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Quad Cities, IA

May 24, 2011Buchanan County, Delaware County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 24, 2011, 5:33 PM CDT for Buchanan County, Delaware County, Iowa. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 24, 2011, 5:33 PM CDT (22:33 UTC)
Expired
May 24, 2011, 6:30 PM CDT
In force
57 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.75 in
Wind
58.0 mph

Counties Buchanan County, IA, Delaware County, IA

The radar

The Quad Cities radar (KDVN), 135 km from the middle of the area, began a volume at 22:33 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.6 hours before the alert went out and 138 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2011-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 206 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2011-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
206 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1287 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

264 
WUUS53 KDVN 242233
SVRDVN
IAC019-055-242330-
/O.NEW.KDVN.SV.W.0049.110524T2233Z-110524T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
533 PM CDT TUE MAY 24 2011

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BUCHANAN COUNTY IN NORTHEAST IOWA...
  NORTHWESTERN DELAWARE COUNTY IN NORTHEAST IOWA...

* UNTIL 630 PM CDT.

* AT 528 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
  STORM WAS LOCATED APPROXIMATELY NEAR WINTHROP...OR 6 MILES
  NORTHEAST OF INDEPENDENCE...AND MOVING NORTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  AURORA...MASONVILLE...LAMONT...DUNDEE AND GREELEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

PLEASE REPORT ANY SEVERE WEATHER OR DAMAGE TO YOUR LOCAL LAW
ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4265 9132 4256 9127 4240 9183 4256 9194
      4265 9175
TIME...MOT...LOC 2233Z 243DEG 13KT 4252 9177
WIND...HAIL <58MPH 1.75IN

$$

HAASE
2 follow-up statements
274 
WWUS53 KDVN 242306
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
606 PM CDT TUE MAY 24 2011

IAC019-055-242330-
/O.CON.KDVN.SV.W.0049.000000T0000Z-110524T2330Z/
DELAWARE IA-BUCHANAN IA-
606 PM CDT TUE MAY 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHEASTERN BUCHANAN AND NORTHWESTERN DELAWARE COUNTIES...

AT 602 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL.  THIS STORM WAS LOCATED APPROXIMATELY NEAR THREE ELMS COUNTY...
OR NEAR INDEPENDENCE...MOVING NORTHEAST AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WINTHROP...WINTHROP GOLF COURSE...LAMONT...AURORA...ONEIDA...
MASONVILLE...MANCHESTER AIRPORT...GREELEY...DUNDEE...COFFINS GROVE
PARK AND BACKBONE STATE PARK.

LAT...LON 4265 9132 4256 9127 4240 9183 4256 9194
      4265 9175
TIME...MOT...LOC 2306Z 243DEG 13KT 4245 9180
WIND...HAIL <58MPH 1.75IN

$$
625 
WWUS53 KDVN 242328
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
628 PM CDT TUE MAY 24 2011

IAC019-055-242339-
/O.EXP.KDVN.SV.W.0049.000000T0000Z-110524T2330Z/
DELAWARE IA-BUCHANAN IA-
628 PM CDT TUE MAY 24 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BUCHANAN AND
NORTHWESTERN DELAWARE COUNTIES WILL EXPIRE AT 630 PM CDT...

THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER HAS
WEAKENED. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN ALLOWED
TO EXPIRE.

LAT...LON 4265 9132 4256 9127 4240 9183 4256 9194
      4265 9175
TIME...MOT...LOC 2329Z 243DEG 13KT 4249 9170

$$

HAASE

The office that day

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

IssuedProductOfficeCountiesLasted
May 24, 4:02 PM CDTSevere Thunderstorm WarningDVNDubuque, Jackson, Jones58 min
May 24, 4:13 PM CDTSpecial Weather StatementDVNBenton, Iowa62 min
May 24, 4:44 PM CDTSevere Thunderstorm WarningDVNBenton, Iowa61 min
May 24, 5:08 PM CDTSevere Thunderstorm WarningDVNCedar, Johnson, Linn52 min
May 24, 5:28 PM CDTSevere Thunderstorm WarningDVNCedar, Johnson, Louisa, Muscatine, Scott47 min
May 24, 5:42 PM CDTSevere Thunderstorm WarningDVNBuchanan, Delaware, Linn48 min
May 24, 5:53 PM CDTTornado WarningDVNBuchanan, Delaware, Linn37 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2011Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.