Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 89, NWS La Crosse, WI

August 24, 2021Chickasaw County, Fayette County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Aug 24, 2021, 2:15 PM CDT for Chickasaw County, Fayette County, Iowa. It was in force for 60 min. 9 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: Aug 24, 2021, 2:15 PM CDT (19:15 UTC)
Expired: Aug 24, 2021, 3:15 PM CDT
In force: 60 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Chickasaw County, IA, Fayette County, IA

The radar

The La Crosse radar (KARX), 123 km from the middle of the area, began a volume at 19:14 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
Aug 24, 2:41 PM CDT	TSTM WND DMG	3 Sw Oelwein, IA	PIECES OF ROOFING RIPPED FROM A CONFINEMENT BUILDING. TIME ESTIMATED FROM RADAR.
Aug 24, 2:43 PM CDT	TSTM WND DMG	Oelwein, IA	SEVERAL UPROOTED AND BROKEN TREES MAINLY ACROSS SOUTHERN END OF TOWN. STRONG WINDS LASTED APPROX 5 MIN
Aug 24, 2:43 PM CDT	TSTM WND DMG	Oelwein, IA	SEVERAL UPROOTED AND BROKEN TREES MAINLY ACROSS SOUTHERN END OF TOWN. STRONG WINDS LASTED APPROX 5 MIN.
Aug 24, 2:48 PM CDT	TSTM WND DMG	7 Ssw Westgate, IA	EARLY REPORTS OF MAJOR WIND DAMAGE IN SOUTHERN FAYETTE CO.
Aug 24, 2:59 PM CDT	TSTM WND GST 60	Oelwein, IA
Aug 24, 2:59 PM CDT	HAIL 0.25	Oelwein, IA
Aug 24, 3:04 PM CDT	TSTM WND DMG	3 Nw Stanley, IA	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Aug 24, 3:06 PM CDT	HAIL 0.75	3 Nw Stanley, IA	REPORT FROM MPING: DIME (0.75 IN.).
Aug 24, 3:10 PM CDT	TSTM WND DMG	Oelwein, IA	MANY MATURE TREES SNAPPED DOWN THE MIDDLE.

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
Aug 24, 1:52 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.3 hours before the alert went out and 184 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.

090 
WUUS53 KARX 241915
SVRARX
IAC037-065-242015-
/O.NEW.KARX.SV.W.0089.210824T1915Z-210824T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
215 PM CDT Tue Aug 24 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Fayette County in northeastern Iowa...
  Southeastern Chickasaw County in northeastern Iowa...

* Until 315 PM CDT.

* At 215 PM CDT, severe thunderstorms were located along a line
  extending from near New Hampton to Tripoli to near Denver, moving
  east at 35 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Oelwein, West Union, Fayette, Fairbank, Elgin, Clermont, Maynard,
  Hawkeye, Arlington, Waucoma, Stanley, Wadena, Westgate, St. Lucas,
  Randalia, Donnan, Eldorado, Highways 3 And 187, Waucoma Campground
  and County Road W 33 And 187.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4264 9208 4291 9208 4291 9210 4309 9210
      4308 9208 4308 9161 4264 9161
TIME...MOT...LOC 1915Z 276DEG 32KT 4303 9235 4284 9226 4264 9232 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurz

3 follow-up statements

620 
WWUS53 KARX 241945
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
245 PM CDT Tue Aug 24 2021

IAC037-241955-
/O.CAN.KARX.SV.W.0089.000000T0000Z-210824T2015Z/
Chickasaw IA-
245 PM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHICKASAW COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4264 9205 4308 9202 4308 9161 4264 9161
TIME...MOT...LOC 1945Z 267DEG 31KT 4307 9192 4264 9194 

$$

IAC065-242015-
/O.CON.KARX.SV.W.0089.000000T0000Z-210824T2015Z/
Fayette IA-
245 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR FAYETTE COUNTY...

At 245 PM CDT, severe thunderstorms were located along a line
extending from near Fort Atkinson to near Hazleton, 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.

Locations impacted include...
Oelwein, West Union, Fayette, Fairbank, Elgin, Clermont, Maynard,
Hawkeye, Arlington, Stanley, Wadena, Westgate, St. Lucas, Randalia,
Donnan, Eldorado, Highways 3 And 187, County Road W 33 And 187,
County Roads 3 And W 45 and Montauk Historic Site.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4264 9205 4308 9202 4308 9161 4264 9161
TIME...MOT...LOC 1945Z 267DEG 31KT 4307 9192 4264 9194 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurz

528 
WWUS53 KARX 241953
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
253 PM CDT Tue Aug 24 2021

IAC065-242015-
/O.CON.KARX.SV.W.0089.000000T0000Z-210824T2015Z/
Fayette IA-
253 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR SOUTHERN FAYETTE COUNTY...

At 252 PM CDT, severe thunderstorms were located along a line
extending from near Fayette to Stanley, moving east at 40 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Trained weather spotters. Multiple trees were reported down 
         just west of Oelwein.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Oelwein, Fayette, Fairbank, Maynard, Arlington, Stanley, Wadena,
Westgate, Randalia, Highway 93 And County W 14, Donnan, Volga River
State Park, Highways 3 And 187, County Road W 45 And 187, County Road
W 33 And 187, County Roads 3 And W 13, County Roads 3 And W 45,
County Roads 3 And W 33 and Albany.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4264 9204 4290 9200 4291 9161 4264 9161
TIME...MOT...LOC 1952Z 290DEG 34KT 4289 9187 4264 9182 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Kurz

926 
WWUS53 KARX 242001
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
301 PM CDT Tue Aug 24 2021

IAC065-242015-
/O.CON.KARX.SV.W.0089.000000T0000Z-210824T2015Z/
Fayette IA-
301 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR SOUTHEASTERN FAYETTE COUNTY...

At 301 PM CDT, severe thunderstorms were located along a line
extending from near Fayette to Aurora, 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.

Locations impacted include...
Oelwein, Fayette, Maynard, Arlington, Stanley, Wadena, Volga River
State Park, Highways 3 And 187, County Road W 45 And 187, County Road
W 33 And 187, County Roads 3 And W 45, County Roads 3 And W 33 and
Albany.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4264 9195 4290 9185 4291 9161 4264 9161
TIME...MOT...LOC 2001Z 276DEG 32KT 4288 9176 4263 9171 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurz

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 2:59 PM CDT	Severe Thunderstorm Warning	ARX	Clayton, Fayette	61 min
Aug 24, 3:12 PM CDT	Special Weather Statement	ARX	Fayette	18 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.