Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 64, NWS Quad Cities, IA

July 7, 2012Clinton County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 7, 2012, 4:59 PM CDT for Clinton County, Iowa. It was in force for 37 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: Jul 7, 2012, 4:59 PM CDT (21:59 UTC)
Expired: Jul 7, 2012, 5:36 PM CDT
In force: 37 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Clinton County, IA

The radar

The Quad Cities radar (KDVN), 20 km from the middle of the area, began a volume at 22:00 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
Jul 7, 5:28 PM CDT	TSTM WND GST 60	5 N Grand Mound, IA	WIND GUSTS ESTIMATED UP TO 60 MPH.

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

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 21 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: 1800 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1877 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 20 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.

051 
WUUS53 KDVN 072159
SVRDVN
IAC045-072300-
/O.NEW.KDVN.SV.W.0064.120707T2159Z-120707T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
459 PM CDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CLINTON COUNTY IN EAST CENTRAL IOWA...

* UNTIL 600 PM CDT.

* AT 455 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS AROUND 60
  MPH.  THIS STORM WAS LOCATED APPROXIMATELY NEAR DELMAR...OR 8 MILES
  SOUTH OF MAQUOKETA...AND MOVING SOUTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WELTON...CALAMUS...GRAND MOUND AND DEWITT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

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

THIS STORM IS ALSO PRODUCING FREQUENT AND DANGEROUS LIGHTNING.

&&

LAT...LON 4176 9044 4177 9048 4177 9051 4177 9053
      4176 9058 4177 9059 4176 9062 4177 9062
      4176 9065 4177 9067 4173 9071 4175 9075
      4177 9078 4202 9077 4203 9049
TIME...MOT...LOC 2159Z 330DEG 7KT 4195 9068
WIND...HAIL 60MPH <1.00IN

$$

MCCLURE

4 follow-up statements

654 
WWUS53 KDVN 072208
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
508 PM CDT SAT JUL 7 2012

IAC045-072300-
/O.CON.KDVN.SV.W.0064.000000T0000Z-120707T2300Z/
CLINTON IA-
508 PM CDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR CENTRAL CLINTON COUNTY...

AT 504 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS
AROUND 60 MPH.  THIS STORM WAS LOCATED APPROXIMATELY NEAR WELTON...OR
11 MILES SOUTH OF MAQUOKETA...MOVING SOUTH AT 20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CALAMUS...GRAND MOUND AND DEWITT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

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

THIS STORM IS ALSO PRODUCING FREQUENT AND DANGEROUS LIGHTNING.

&&

LAT...LON 4176 9044 4177 9048 4177 9053 4176 9058
      4177 9059 4176 9065 4177 9067 4173 9071
      4177 9078 4197 9077 4198 9049
TIME...MOT...LOC 2208Z 343DEG 18KT 4189 9067
WIND...HAIL 60MPH <1.00IN

$$

MCCLURE

247 
WWUS53 KDVN 072217
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
517 PM CDT SAT JUL 7 2012

IAC045-072300-
/O.CON.KDVN.SV.W.0064.000000T0000Z-120707T2300Z/
CLINTON IA-
517 PM CDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR CENTRAL CLINTON COUNTY...

AT 513 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS
AROUND 60 MPH.  THIS STORM WAS LOCATED APPROXIMATELY NEAR GRAND
MOUND...OR 13 MILES SOUTH OF MAQUOKETA...MOVING SOUTH AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CALAMUS
AND DEWITT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

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

THIS STORM IS ALSO PRODUCING FREQUENT AND DANGEROUS LIGHTNING.

&&

LAT...LON 4194 9052 4177 9053 4176 9058 4177 9059
      4176 9065 4177 9067 4174 9070 4173 9071
      4177 9078 4194 9076
TIME...MOT...LOC 2217Z 343DEG 13KT 4187 9066
WIND...HAIL 60MPH <1.00IN

$$

MCCLURE

069 
WWUS53 KDVN 072231
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
531 PM CDT SAT JUL 7 2012

IAC045-072300-
/O.CON.KDVN.SV.W.0064.000000T0000Z-120707T2300Z/
CLINTON IA-
531 PM CDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT 
FOR CENTRAL CLINTON COUNTY...

AT 530 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS AROUND 60 
MPH.  THIS STORM WAS LOCATED APPROXIMATELY NEAR GRAND MOUND...OR 15 
MILES SOUTH OF MAQUOKETA...MOVING SOUTH AT 15 MPH. AT 528 PM CDT...
THE PUBLIC REPORTED WINDS ESTIMATED AT 50 TO 60 MPH NORTH OF GRAND 
MOUND. 

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DEWITT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY
FROM WINDOWS.

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

&&

LAT...LON 4189 9053 4177 9053 4176 9058 4177 9059
      4176 9065 4177 9067 4174 9070 4174 9071
      4187 9071
TIME...MOT...LOC 2230Z 343DEG 13KT 4184 9064
WIND...HAIL 60MPH <1.00IN

$$

MCCLURE

592 
WWUS53 KDVN 072236
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
536 PM CDT SAT JUL 7 2012

IAC045-072246-
/O.CAN.KDVN.SV.W.0064.000000T0000Z-120707T2300Z/
CLINTON IA-
536 PM CDT SAT JUL 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CLINTON COUNTY IS 
CANCELLED...

THE THUNDERSTORM THAT HAD A HISTORY OF PRODUCING SEVERE WEATHER HAS 
WEAKENED. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN 
CANCELLED.

LAT...LON 4189 9053 4177 9053 4176 9058 4177 9059
      4176 9065 4177 9067 4174 9070 4174 9071
      4187 9071
TIME...MOT...LOC 2236Z 343DEG 13KT 4182 9063

$$

MCCLURE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 4:20 PM CDT	Special Weather Statement	DVN	Clinton, Jackson	55 min
Jul 7, 6:01 PM CDT	Special Weather Statement	DVN	Cedar	44 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.