Alert archive / Iowa / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 79, NWS Des Moines, IA

July 11, 2016Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 11, 2016, 8:29 PM CDT for Crawford County, Iowa. It was in force for 46 min. 2 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: Jul 11, 2016, 8:29 PM CDT (01:29 UTC)
Expired: Jul 11, 2016, 9:15 PM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Crawford County, IA

The radar

The Omaha radar (KOAX), 112 km from the middle of the area, began a volume at 01:33 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.

What was reported inside it

Time	Report	Where	Remark
Jul 11, 8:50 PM CDT	TSTM WND DMG	5 W Dow City, IA	SEVERAL TREES AND TREE LIMBS DOWN. TIME ESTIMATED.
Jul 11, 9:11 PM CDT	TSTM WND DMG	Deloit, IA	NUMEROUS TREE LIMBS DOWN.

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
Jul 11, 3:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.5 hours before the alert went out and 112 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: 3311 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1411 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 14.7

Open this sounding in Storm Lab

The text

As transmitted.

667 
WUUS53 KDMX 120129
SVRDMX
IAC047-120215-
/O.NEW.KDMX.SV.W.0079.160712T0129Z-160712T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
829 PM CDT MON JUL 11 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CRAWFORD COUNTY IN WEST CENTRAL IOWA...

* UNTIL 915 PM CDT

* AT 829 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR UTE...OR 18
  MILES SOUTHWEST OF IDA GROVE...MOVING EAST AT 45 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  DENISON...DUNLAP...SCHLESWIG...MANILLA...DOW CITY...CHARTER OAK...
  VAIL...KIRON...DELOIT...RICKETTS...ARION...BUCK GROVE AND DENISON
  MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN DES MOINES .

&&

LAT...LON 4221 9567 4221 9517 4186 9517 4186 9567
TIME...MOT...LOC 0129Z 268DEG 39KT 4214 9571 

HAIL...0.75IN
WIND...60MPH
 
$$

KOTENBERG

2 follow-up statements

145 
WWUS53 KDMX 120158
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
858 PM CDT MON JUL 11 2016

IAC047-120215-
/O.CON.KDMX.SV.W.0079.000000T0000Z-160712T0215Z/
CRAWFORD IA-
858 PM CDT MON JUL 11 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR CRAWFORD COUNTY...

AT 857 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 7 MILES SOUTHWEST OF ODEBOLT TO NEAR DEFIANCE...MOVING
EAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

SOURCE...TRAINED WEATHER SPOTTERS REPORTED POWER OUTAGES AND TREES
         DOWN 5 MILES WEST OF DOW CITY AT 850 PM. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
DENISON...DUNLAP...SCHLESWIG...MANILLA...DOW CITY...CHARTER OAK...
VAIL...KIRON...DELOIT...RICKETTS...ARION...BUCK GROVE AND DENISON
MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
DES MOINES .

&&

LAT...LON 4221 9567 4221 9517 4186 9517 4186 9567
TIME...MOT...LOC 0157Z 270DEG 31KT 4221 9533 4185 9537 

HAIL...0.75IN
WIND...60MPH
 
$$

KOTENBERG

215 
WWUS53 KDMX 120208
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
908 PM CDT MON JUL 11 2016

IAC047-120218-
/O.EXP.KDMX.SV.W.0079.000000T0000Z-160712T0215Z/
CRAWFORD IA-
908 PM CDT MON JUL 11 2016

...THE SEVERE THUNDERSTORM WARNING FOR CRAWFORD COUNTY WILL EXPIRE AT
915 PM CDT...
    
THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER GUSTY WINDS
AND HEAVY RAIN ARE STILL POSSIBLE WITH THESE THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FOR
WEST CENTRAL IOWA.

LAT...LON 4221 9567 4221 9517 4186 9517 4186 9567
TIME...MOT...LOC 0208Z 268DEG 39KT 4221 9518 4185 9522 

$$

KOTENBERG

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 8:13 PM CDT	Special Weather Statement	DMX	Sac	47 min
Jul 11, 9:07 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	38 min
Jul 11, 9:11 PM CDT	Special Weather Statement	DMX	Pocahontas	49 min
Jul 11, 9:29 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Sac	46 min
Jul 11, 9:41 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac, Webster	34 min
Jul 11, 9:45 PM CDT	Special Weather Statement	DMX	Audubon, Guthrie	45 min
Jul 11, 10:10 PM CDT	Special Weather Statement	DMX	Boone, Greene, Hamilton, Webster	50 min
Jul 11, 10:50 PM CDT	Special Weather Statement	DMX	Polk, Story	40 min
Jul 11, 11:24 PM CDT	Special Weather Statement	DMX	Butler, Grundy, Hardin	51 min
Jul 11, 11:26 PM CDT	Special Weather Statement	DMX	Worth	34 min
Jul 11, 11:29 PM CDT	Special Weather Statement	DMX	Jasper, Marion	46 min
Jul 11, 11:51 PM CDT	Special Weather Statement	DMX	Marshall	24 min
Jul 12, 12:00 AM CDT	Special Weather Statement	DMX	Black Hawk, Bremer	30 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2016 Every severe thunderstorm warning in 2016

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.