Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 5, NWS La Crosse, WI

June 9, 2018Floyd County, Iowa

NWS La Crosse, WI issued this tornado warning at Jun 9, 2018, 4:19 PM CDT for Floyd County, Iowa. It was in force for 41 min. 10 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: Jun 9, 2018, 4:19 PM CDT (21:19 UTC)
Expired: Jun 9, 2018, 5:00 PM CDT
In force: 41 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

County Floyd County, IA

The radar

The La Crosse radar (KARX), 162 km from the middle of the area, began a volume at 21:17 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
Jun 9, 4:27 PM CDT	HAIL 1.75	2 S Nora Springs, IA
Jun 9, 4:30 PM CDT	TSTM WND DMG	1 Ese Rockford, IA	TREES AND LIMBS DOWN, LIGHT POLE DOWN ON OUTBUILDING, AND BLEACHERS BLOWN THROUGH FENCE AT ROCKVILLE HIGH SCHOOL BASEBALL/SOFTBALL COMPLEX. TIME ESTIMATED FROM RADAR. REPORT VIA PHOTOS ON SOCIAL MEDIA.
Jun 9, 4:30 PM CDT	TSTM WND DMG	2 W Rockford, IA	FARM OUTBUILDING DESTROYED WITH DEBRIS SCATTERED THROUGH ACROSS STREET AND THROUGH A FIELD. TIME ESTIMATED FROM RADAR. REPORT VIA PHOTOS ON SOCIAL MEDIA.
Jun 9, 4:30 PM CDT	TSTM WND DMG	Rockford, IA	NUMEROUS TREES DOWN. TIME ESTIMATED FROM RADAR. REPORT VIA SOCIAL MEDIA PHOTOS.
Jun 9, 4:32 PM CDT	TSTM WND GST 75	2 W Rockford, IA
Jun 9, 4:36 PM CDT	TSTM WND GST 75	Rockford, IA
Jun 9, 4:37 PM CDT	TSTM WND GST 70	1 W Rudd, IA
Jun 9, 4:50 PM CDT	HAIL 1	4 E Rockford, IA	REPORT VIA SOCIAL MEDIA.
Jun 9, 4:53 PM CDT	TSTM WND DMG	Rockford, IA	HAY RACKS BLOWN ACROSS FARM AND THROUGH FENCE. POWER OUT. REPORT VIA PHOTO ON SOCIAL MEDIA.
Jun 9, 5:00 PM CDT	TSTM WND GST 80	4 W Floyd, IA

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
Jun 9, 2:26 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.3 hours before the alert went out and 205 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: 395 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 661 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

182 
WFUS53 KARX 092119
TORARX
IAC067-092200-
/O.NEW.KARX.TO.W.0005.180609T2119Z-180609T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
419 PM CDT SAT JUN 9 2018

The National Weather Service in La Crosse has issued a

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

* Until 500 PM CDT
    
* At 417 PM CDT, a severe thunderstorm capable of producing a 
  tornado was located southeast of Mason City, moving east at 25 mph.

  HAZARD...Tornado and ping pong ball size hail. 

  SOURCE...Radar indicated rotation. 

  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 dangerous storm will be near...
  Rockford around 435 PM CDT. 
  Rudd around 440 PM CDT. 
  Marble Rock around 445 PM CDT. 

This storm has a history of tornadoes and large hail.

Other locations impacted by this tornadic thunderstorm include
Highway 14 And County Road B 60, County Roads 147 And T 34, Oakwood,
Roseville and County Roads B 60 And T 18.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area. Flash flooding will also occur with heavy rain.

&&

LAT...LON 4315 9302 4315 9276 4293 9276 4298 9302
TIME...MOT...LOC 2117Z 272DEG 21KT 4307 9308 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

Shea

3 follow-up statements

893 
WWUS53 KARX 092134
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
434 PM CDT SAT JUN 9 2018

IAC067-092200-
/O.CON.KARX.TO.W.0005.000000T0000Z-180609T2200Z/
Floyd IA-
434 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR WESTERN
FLOYD COUNTY...
    
At 433 PM CDT, a severe thunderstorm capable of producing a tornado 
was located just northwest of Rockford, or 11 miles southeast of 
Mason City, moving east at 15 mph.

HAZARD...Tornado and golf ball size hail. 

SOURCE...Radar indicated rotation. 

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 dangerous storm will be near...
  Rockford around 445 PM CDT. 
  Rudd around 450 PM CDT. 
  Marble Rock around 500 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Highway 14 And County Road B 60, County Roads 147 And T 34, Oakwood,
Roseville and County Roads B 60 And T 18.

LAT...LON 4315 9302 4315 9276 4293 9276 4298 9302
TIME...MOT...LOC 2133Z 271DEG 13KT 4307 9300 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Shea

419 
WWUS53 KARX 092137
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
437 PM CDT SAT JUN 9 2018

IAC067-092200-
/O.CON.KARX.TO.W.0005.000000T0000Z-180609T2200Z/
Floyd IA-
437 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR WESTERN
FLOYD COUNTY...
    
At 436 PM CDT, a severe thunderstorm capable of producing a tornado 
was near Rockford, or 12 miles west of Charles City, moving east at 
20 mph. Rockford Fire Department reported 75 mph wind gusts in town.

HAZARD...Tornado and golf ball size hail. 

SOURCE...Radar indicated rotation. 

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 dangerous storm will be near...
  Marble Rock around 440 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Highway 14 And County Road B 60, County Roads 147 And T 34, Oakwood,
Roseville and County Roads B 60 And T 18.

LAT...LON 4315 9302 4315 9276 4293 9276 4298 9302
TIME...MOT...LOC 2136Z 274DEG 32KT 4306 9292 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Shea

260 
WWUS53 KARX 092156
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
456 PM CDT SAT JUN 9 2018

IAC067-092204-
/O.EXP.KARX.TO.W.0005.000000T0000Z-180609T2200Z/
Floyd IA-
456 PM CDT SAT JUN 9 2018

...THE TORNADO WARNING FOR WESTERN FLOYD COUNTY WILL EXPIRE AT 500 PM
CDT...
    
The signal for a tornado has decreased somewhat so the warning will 
be allowed to expire at 5 pm. However, large hail and damaging winds 
remain likely and a Severe Thunderstorm Warning remains in effect 
for the area.

If new rotation is noted or tornadoes are reported, new warnings 
will follow.

A tornado watch remains in effect until 1000 PM CDT for north central
Iowa.

LAT...LON 4315 9302 4315 9276 4293 9276 4298 9302
TIME...MOT...LOC 2154Z 272DEG 21KT 4306 9278 

$$

Shea

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 9:44 PM CDT	River Flood Warning	ARX	Floyd	23 hr
Jun 9, 11:04 AM CDT	Flash Flood Watch	ARX	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	14 hr
Jun 9, 11:38 AM CDT	Special Weather Statement	ARX	Howard, Mitchell	67 min
Jun 9, 12:30 PM CDT	Special Weather Statement	ARX	Mitchell	30 min
Jun 9, 12:40 PM CDT	Severe Thunderstorm Warning	ARX	Mitchell	50 min
Jun 9, 1:00 PM CDT	Tornado Warning	ARX	Mitchell	45 min
Jun 9, 1:10 PM CDT	Severe Thunderstorm Warning	ARX	Howard	65 min
Jun 9, 3:51 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	54 min
Jun 9, 4:04 PM CDT	Flash Flood Warning	ARX	Floyd, Mitchell	3 hr
Jun 9, 4:41 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Floyd	79 min
Jun 9, 5:49 PM CDT	Flash Flood Warning	ARX	Howard, Winneshiek	3 hr
Jun 9, 5:58 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Floyd	47 min
Jun 9, 6:07 PM CDT	Severe Thunderstorm Warning	ARX	Fayette	83 min
Jun 9, 6:20 PM CDT	Severe Thunderstorm Warning	ARX	Winneshiek	55 min
Jun 9, 6:45 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	45 min
Jun 9, 6:58 PM CDT	Areal Flood Warning	ARX	Floyd, Mitchell	6 hr

Nearby

Tornado Warnings in Iowa, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.