Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS La Crosse, WI

July 14, 2021Floyd County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 14, 2021, 9:06 AM CDT for Floyd County, Iowa. It was in force for 39 min. 1 report 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 14, 2021, 9:06 AM CDT (14:06 UTC)
Expired: Jul 14, 2021, 9:45 AM CDT
In force: 39 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Floyd County, IA

The radar

The La Crosse radar (KARX), 157 km from the middle of the area, began a volume at 14:06 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 14, 9:55 AM CDT	TSTM WND GST 44	3 E Charles City, IA	AWOS STATION KCCY CHARLES CITY AIRPORT.

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 14, 8:54 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 2.1 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: 2820 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1084 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

296 
WUUS53 KARX 141406
SVRARX
IAC067-141445-
/O.NEW.KARX.SV.W.0050.210714T1406Z-210714T1445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
906 AM CDT Wed Jul 14 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Floyd County in north central Iowa...

* Until 945 AM CDT.

* At 905 AM CDT, severe thunderstorms were located along a line
  extending from near Mason City to 6 miles west of Allison to near
  Aplington, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Rudd around 925 AM CDT.
  Nashua around 940 AM CDT.

Other locations impacted by these severe thunderstorms include County
Roads B 60 And T 18, Howards Wood Recreational Area, Idlewilde State
Park, Roseville, Howardville, County Roads B 20 And T 26 and Oakwood.

People attending the Floyd County Fairgrounds should seek safe
shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4320 9302 4321 9300 4321 9255 4291 9255
      4291 9303
TIME...MOT...LOC 1405Z 239DEG 36KT 4309 9318 4277 9291 4258 9296 

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

Rieck

3 follow-up statements

658 
WWUS53 KARX 141421
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
921 AM CDT Wed Jul 14 2021

IAC067-141445-
/O.CON.KARX.SV.W.0050.000000T0000Z-210714T1445Z/
Floyd IA-
921 AM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR FLOYD COUNTY...

At 921 AM CDT, severe thunderstorms were located along a line
extending from near Rockford to Clarksville to Parkersburg, moving
east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Floyd around 940 AM CDT.
  Charles City around 945 AM CDT.

Other locations impacted by these severe thunderstorms include County
Roads B 60 And T 18, Howards Wood Recreational Area, Idlewilde State
Park, Roseville, Howardville, County Roads B 20 And T 26 and Oakwood.

People attending the Floyd County Fairgrounds should seek safe
shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4320 9302 4321 9300 4321 9255 4291 9255
      4291 9303
TIME...MOT...LOC 1421Z 270DEG 36KT 4309 9297 4277 9270 4258 9275 

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

Rieck

105 
WWUS53 KARX 141435
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
935 AM CDT Wed Jul 14 2021

IAC067-141445-
/O.CON.KARX.SV.W.0050.000000T0000Z-210714T1445Z/
Floyd IA-
935 AM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM CDT
FOR FLOYD COUNTY...

At 934 AM CDT, severe thunderstorms were located along a line
extending from near Rudd to 6 miles northeast of Clarksville to near
Shell Rock, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Nashua around 945 AM CDT.

Other locations impacted by these severe thunderstorms include County
Roads B 60 And T 18, Howards Wood Recreational Area, Idlewilde State
Park, Roseville, Howardville, County Roads B 20 And T 26 and Oakwood.

People attending the Floyd County Fairgrounds should seek safe
shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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



&&

LAT...LON 4320 9302 4321 9300 4321 9255 4291 9255
      4291 9303
TIME...MOT...LOC 1434Z 247DEG 34KT 4318 9287 4286 9260 4267 9265 

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

Rieck

453 
WWUS53 KARX 141442
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
942 AM CDT Wed Jul 14 2021

IAC067-141452-
/O.EXP.KARX.SV.W.0050.000000T0000Z-210714T1445Z/
Floyd IA-
942 AM CDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR FLOYD COUNTY WILL EXPIRE AT
945 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
north central and northeastern Iowa.

LAT...LON 4320 9302 4321 9300 4321 9255 4291 9255
      4291 9303
TIME...MOT...LOC 1442Z 239DEG 36KT 4322 9279 4290 9252 4271 9257 

$$

Rieck

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:43 AM CDT	Special Weather Statement	ARX	Fayette	62 min
Jul 14, 6:23 AM CDT	Special Weather Statement	ARX	Fayette	67 min
Jul 14, 6:55 AM CDT	Special Weather Statement	ARX	Clayton	65 min
Jul 14, 5:33 PM CDT	Tornado Warning	ARX	Floyd	42 min
Jul 14, 6:00 PM CDT	Tornado Warning	ARX	Fayette	45 min
Jul 14, 6:09 PM CDT	Tornado Warning Tornado observed	ARX	Chickasaw, Floyd	52 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.