Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Quad Cities, IA

April 14, 20124 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 14, 2012, 9:26 PM CDT for 4 counties in Iowa. It was in force for 64 min. 5 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: Apr 14, 2012, 9:26 PM CDT (02:26 UTC)
Expired: Apr 14, 2012, 10:30 PM CDT
In force: 64 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

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

The radar

The Quad Cities radar (KDVN), 125 km from the middle of the area, began a volume at 02:27 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
Apr 14, 9:30 PM CDT	TSTM WND DMG	4 W Hedrick, IA	FROM APPROXIMATELY 930 PM TO 945 PM SOME POWER LINES WERE BLOWN DOWN AND SOME WIND DAMAGE OCCURRED FROM 4 MILES WEST OF HEDRICK EASTWARD ALONG HIGHWAY 78 TO OLLIE. THE EXTENT OF DAMAGE IS UNKNOWN AT THIS TIME.
Apr 14, 9:35 PM CDT	TSTM WND DMG	Hedrick, IA	APPROX 10 HOMES DAMAGED IN HEDRICK ALONG WITH RURAL FARMSTEADS. DEPUTY POLICE CAR WAS TURNED AROUND AND FELL INTO A DITCH. TREES DOWN. DELAYED REPORT.
Apr 14, 9:56 PM CDT	TSTM WND GST 60	W Ollie, IA	ESTIMATED 50 TO 60 MPH. HAIL UP TO SIZE OF HALF DOLLARS.
Apr 14, 9:56 PM CDT	HAIL 1.25	W Ollie, IA	ALSO 50 TO 60 MPH WINDS ESTIMATED.
Apr 14, 10:20 PM CDT	HAIL 1	Wayland, IA	PEA SIZED ALONG WITH QUARTER SIZED HAIL.

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
Apr 14, 8:41 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.4 hours before the alert went out and 132 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: 300 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 726 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

462 
WUUS53 KDVN 150226
SVRDVN
IAC087-101-107-183-150330-
/O.NEW.KDVN.SV.W.0013.120415T0226Z-120415T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
926 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN HENRY COUNTY IN SOUTHEAST IOWA...
  NORTHERN JEFFERSON COUNTY IN SOUTHEAST IOWA...
  SOUTHERN KEOKUK COUNTY IN SOUTHEAST IOWA...
  SOUTHWESTERN WASHINGTON COUNTY IN SOUTHEAST IOWA...

* UNTIL 1030 PM CDT.

* AT 923 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS AROUND 60
  MPH...AND PING PONG BALL SIZE HAIL.  THIS STORM WAS LOCATED
  APPROXIMATELY NEAR HEDRICK...OR 11 MILES NORTH OF OTTUMWA...AND
  MOVING EAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MARTINSBURG...ABINGDON...PACKWOOD...RICHLAND...MAHARISHI VEDIC
  CITY...FAIRFIELD...PLEASANT PLAIN...BRIGHTON...COPPOCK...
  LOCKRIDGE...WAYLAND AND ROME.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4121 9157 4120 9157 4094 9167 4104 9218
      4115 9219 4116 9241 4126 9242
TIME...MOT...LOC 0226Z 278DEG 46KT 4116 9232
WIND...HAIL 60MPH 1.50IN

$$

NICHOLS

1 follow-up statement

136 
WWUS53 KDVN 150323
SVSDVN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1023 PM CDT SAT APR 14 2012

IAC087-101-107-183-150334-
/O.EXP.KDVN.SV.W.0013.000000T0000Z-120415T0330Z/
WASHINGTON IA-KEOKUK IA-JEFFERSON IA-HENRY IA-
1023 PM CDT SAT APR 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HENRY...NORTHERN
JEFFERSON...SOUTHERN KEOKUK AND SOUTHWESTERN WASHINGTON COUNTIES WILL
EXPIRE AT 1030 PM CDT...

THE THUNDERSTORM THAT WAS CAPABLE OF PRODUCING SEVERE WEATHER HAS
MOVED OUT OF THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM
WARNING HAS BEEN ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT SUNDAY
MORNING FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS.

LAT...LON 4121 9157 4120 9157 4094 9167 4104 9218
      4115 9219 4116 9241 4126 9242
TIME...MOT...LOC 0324Z 272DEG 30KT 4115 9161

$$

ERVIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 9:03 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Louisa, Muscatine, Scott	43 min
Apr 14, 9:14 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Keokuk, Linn, Washington	61 min
Apr 14, 9:38 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Cedar, Iowa, Johnson, Jones, Keokuk and 4 more	55 min
Apr 14, 9:55 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Keokuk, Louisa, Washington	65 min
Apr 15, 12:31 AM CDT	Special Weather Statement	DVN	Scott	74 min
Apr 15, 3:28 AM CDT	Wind Advisory	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more	19 hr
Apr 15, 11:10 AM CDT	River Flood Warning	DVN	Johnson, Washington	22 hr
Apr 15, 2:56 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Lee, Van Buren	64 min
Apr 15, 3:37 PM CDT	Special Weather Statement	DVN	Clinton, Des Moines, Louisa, Muscatine, Scott	53 min
Apr 15, 4:18 PM CDT	Special Weather Statement	DVN	Cedar, Des Moines, Henry, Lee, Louisa, Muscatine and 2 more	57 min
Apr 15, 5:16 PM CDT	Special Weather Statement	DVN	Clinton, Des Moines, Henry, Lee, Louisa, Muscatine and 1 more	59 min
Apr 15, 5:59 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Lee, Louisa, Muscatine	2 hr

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.