Alert archive / Iowa / Tornado Warnings in 2024

Tornado Warning 2, NWS La Crosse, WI

May 9, 2024Floyd County, Iowa

NWS La Crosse, WI issued this tornado warning at May 9, 2024, 1:11 PM CDT for Floyd County, Iowa. It was in force for 16 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: May 9, 2024, 1:11 PM CDT (18:11 UTC)
Expired: May 9, 2024, 1:27 PM CDT
In force: 16 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Floyd County, IA

The radar

The La Crosse radar (KARX), 154 km from the middle of the area, began a volume at 18:12 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
May 9, 1:15 PM CDT	FUNNEL CLOUD	4 S Charles City, IA	Numerous reports of funnel clouds from near Charles City to south of Charles City from 1257pm until 125pm. Possible tornado from video at 115pm.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.2 hours before the alert went out and 219 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 729 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

652 
WFUS53 KARX 091811
TORARX
IAC067-091845-
/O.NEW.KARX.TO.W.0002.240509T1811Z-240509T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
111 PM CDT Thu May 9 2024

The National Weather Service in La Crosse has issued a

* Tornado Warning for...
  Southeastern Floyd County in north central Iowa...

* Until 145 PM CDT.

* At 110 PM CDT, a confirmed tornado was located near Charles City,
  moving southeast at 15 mph.

  HAZARD...Damaging tornado.

  SOURCE...Law enforcement confirmed tornado.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  southeastern Floyd County, including the following locations...
  County Roads B 60 And T 64, Oakwood, Midway, Bunns Woods County
  Park, Powersville, and Carrville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4301 9282 4308 9259 4291 9256 4291 9278
TIME...MOT...LOC 1810Z 337DEG 14KT 4299 9267 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

Zapotocny

1 follow-up statement

086 
WWUS53 KARX 091827
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
127 PM CDT Thu May 9 2024

IAC067-091837-
/O.CAN.KARX.TO.W.0002.000000T0000Z-240509T1845Z/
Floyd IA-
127 PM CDT Thu May 9 2024

...THE TORNADO WARNING FOR SOUTHEASTERN FLOYD COUNTY IS CANCELLED...

The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

&&

LAT...LON 4301 9282 4308 9259 4291 9256 4291 9278
TIME...MOT...LOC 1825Z 337DEG 14KT 4293 9263 

$$

Zapotocny

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 4:44 PM CDT	Special Weather Statement	ARX	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	16 min

Nearby

Tornado Warnings in Iowa, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.