Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS La Crosse, WI

August 24, 2021Fayette County, Iowa

NWS La Crosse, WI issued this special weather statement at Aug 24, 2021, 3:12 PM CDT for Fayette County, Iowa. It was in force for 18 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 24, 2021, 3:12 PM CDT (20:12 UTC)
Expired: Aug 24, 2021, 3:30 PM CDT
In force: 18 min
Issued by: NWS La Crosse, WI
Hail: 0.00 in
Wind: 40

County Fayette County, IA

The radar

The La Crosse radar (KARX), 134 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 172 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: 1809 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1284 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

836 
WWUS83 KARX 242012
SPSARX

Special Weather Statement
National Weather Service La Crosse WI
312 PM CDT Tue Aug 24 2021
 
IAZ029-242030-
Fayette IA-
312 PM CDT Tue Aug 24 2021

...A strong thunderstorm will impact portions of southern Fayette
County through 330 PM CDT...

At 310 PM CDT, strong winds were occurring on the backside of the 
departing thunderstorms in southern Fayette County. These winds may 
persist for another 20 to 30 minutes after the strongest portion of 
the storm departs.

HAZARD...Winds in excess of 40 mph.

SOURCE...Trained weather spotters.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Oelwein, Fayette, Maynard, Westgate, Randalia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern Iowa.

&&

LAT...LON 4264 9208 4291 9208 4291 9168 4264 9172
TIME...MOT...LOC 2010Z 275DEG 33KT 4275 9193 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Skow

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 6:11 AM CDT	Special Weather Statement	ARX	Buffalo, Trempealeau	94 min
Aug 24, 6:50 AM CDT	Severe Thunderstorm Warning	ARX	Jackson, Trempealeau	40 min
Aug 24, 7:18 AM CDT	Severe Thunderstorm Warning	ARX	Clark, Jackson	72 min
Aug 24, 7:33 AM CDT	Special Weather Statement	ARX	Buffalo	72 min
Aug 24, 8:41 AM CDT	Special Weather Statement	ARX	Trempealeau	49 min
Aug 24, 9:07 AM CDT	Special Weather Statement	ARX	Clark, Taylor	53 min
Aug 24, 10:00 AM CDT	Special Weather Statement	ARX	Adams	15 min
Aug 24, 3:35 PM CDT	Tornado Warning	ARX	Grant	40 min
Aug 24, 4:09 PM CDT	Severe Thunderstorm Warning	ARX	Grant	36 min
Aug 24, 12:35 PM CDT	Special Weather Statement	ARX	Mitchell	55 min
Aug 24, 12:38 PM CDT	Special Weather Statement	ARX	Floyd	67 min
Aug 24, 1:29 PM CDT	Special Weather Statement	ARX	Howard, Mitchell	46 min
Aug 24, 1:43 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Floyd	47 min
Aug 24, 1:48 PM CDT	Special Weather Statement	ARX	Chickasaw	27 min
Aug 24, 2:15 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Fayette	60 min
Aug 24, 2:59 PM CDT	Severe Thunderstorm Warning	ARX	Clayton, Fayette	61 min

Nearby

Special Weather Statements in Iowa, 2021 Every special weather statement in 2021

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.