Alert archive / Iowa / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 65, NWS La Crosse, WI

August 4, 2016Allamakee County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Aug 4, 2016, 4:18 PM CDT for Allamakee County, Iowa. It was in force for 42 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: Aug 4, 2016, 4:18 PM CDT (21:18 UTC)
Expired: Aug 4, 2016, 5:00 PM CDT
In force: 42 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Allamakee County, IA

The radar

The La Crosse radar (KARX), 51 km from the middle of the area, began a volume at 21:21 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, 9.3 hours before the alert went out and 203 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: 500 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 970 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

481 
WUUS53 KARX 042118
SVRARX
IAC005-042200-
/O.NEW.KARX.SV.W.0065.160804T2118Z-160804T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
418 PM CDT THU AUG 4 2016

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ALLAMAKEE COUNTY IN NORTHEASTERN IOWA...

* UNTIL 500 PM CDT

* AT 418 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES NORTH OF
  WAUKON...MOVING EAST AT 35 MPH.

  HAZARD...60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  NEW ALBIN AROUND 425 PM CDT. 
  LANSING AROUND 435 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE VILLAGE
CREEK...COUNTY ROADS A 52 AND X 52...COUNTY ROADS A 26 AND X 6
A...ELON AND RED BARN CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4330 9160 4350 9161 4350 9123 4348 9121
      4346 9123 4345 9123 4341 9120 4339 9120
      4337 9122 4335 9121 4331 9111 4326 9107
      4326 9106 4324 9106 4322 9109
TIME...MOT...LOC 2118Z 292DEG 29KT 4337 9143 

HAIL...1.25IN
WIND...60MPH
 
$$

DAB

3 follow-up statements

112 
WWUS53 KARX 042130
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
430 PM CDT THU AUG 4 2016

IAC005-042200-
/O.CON.KARX.SV.W.0065.000000T0000Z-160804T2200Z/
ALLAMAKEE IA-
430 PM CDT THU AUG 4 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR NORTHERN ALLAMAKEE COUNTY...

AT 430 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
LANSING...MOVING EAST AT 35 MPH.

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

SOURCE...RADAR INDICATED. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING...AND TREES. 

THIS SEVERE STORM WILL BE NEAR...
  LANSING AROUND 435 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE VILLAGE
CREEK...COUNTY ROADS A 52 AND X 52...COUNTY ROADS A 26 AND X 6
A...ELON AND RED BARN CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4329 9154 4350 9142 4350 9123 4348 9121
      4346 9123 4345 9123 4341 9120 4339 9120
      4337 9122 4335 9121 4331 9111 4326 9107
      4326 9106 4324 9106 4322 9109
TIME...MOT...LOC 2130Z 292DEG 29KT 4333 9130 

HAIL...1.00IN
WIND...60MPH
 
$$

DAB

324 
WWUS53 KARX 042149
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
449 PM CDT THU AUG 4 2016

IAC005-042200-
/O.CON.KARX.SV.W.0065.000000T0000Z-160804T2200Z/
ALLAMAKEE IA-
449 PM CDT THU AUG 4 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR EAST CENTRAL ALLAMAKEE COUNTY...

AT 448 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR HARPERS
FERRY... OR 8 MILES SOUTHEAST OF LANSING...MOVING EAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

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

THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF EAST
CENTRAL ALLAMAKEE COUNTY...INCLUDING THE FOLLOWING LOCATIONS:
DALBY... VILLAGE CREEK...THOMPSON CORNER...LOCK AND DAM 9 AND COUNTY
ROADS A 52 AND X 52.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM. DO NOT DRIVE YOUR
VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4326 9135 4333 9130 4335 9121 4331 9111
      4326 9107 4326 9106 4324 9106 4322 9109
TIME...MOT...LOC 2148Z 292DEG 29KT 4327 9111 

HAIL...<.75IN
WIND...60MPH
 
$$

DAB

648 
WWUS53 KARX 042158
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
458 PM CDT THU AUG 4 2016

IAC005-042208-
/O.EXP.KARX.SV.W.0065.000000T0000Z-160804T2200Z/
ALLAMAKEE IA-
458 PM CDT THU AUG 4 2016

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ALLAMAKEE COUNTY
WILL EXPIRE AT 500 PM CDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER HEAVY RAIN
IS STILL POSSIBLE WITH THIS THUNDERSTORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
NORTHEASTERN IOWA...AND SOUTHWESTERN WISCONSIN.

LAT...LON 4326 9135 4333 9130 4335 9121 4331 9111
      4326 9107 4326 9106 4324 9106 4322 9109
TIME...MOT...LOC 2155Z 292DEG 29KT 4327 9111 

$$

DAB

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 5:47 PM CDT	Special Weather Statement	ARX	Allamakee, Chickasaw, Clayton, Fayette, Winneshiek	118 min
Aug 4, 6:09 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Winneshiek	66 min
Aug 4, 6:44 PM CDT	Special Weather Statement	ARX	Allamakee, Clayton	91 min
Aug 4, 6:46 PM CDT	Severe Thunderstorm Warning	ARX	Clayton, Fayette	44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.