Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 20, NWS La Crosse, WI

July 19, 2017Howard County, Iowa

NWS La Crosse, WI issued this tornado warning at Jul 19, 2017, 5:19 PM CDT for Howard County, Iowa. It was in force for 10 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: Jul 19, 2017, 5:19 PM CDT (22:19 UTC)
Expired: Jul 19, 2017, 5:29 PM CDT
In force: 10 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Howard County, IA

The radar

The La Crosse radar (KARX), 102 km from the middle of the area, began a volume at 22:20 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 19, 3:29 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.3 hours before the alert went out and 182 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: 1964 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

312 
WFUS53 KARX 192219
TORARX
IAC089-192245-
/O.NEW.KARX.TO.W.0020.170719T2219Z-170719T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
519 PM CDT WED JUL 19 2017

The National Weather Service in La Crosse has issued a

* Tornado Warning for...
  Northern Howard County in northeastern Iowa...

* Until 545 PM CDT
    
* At 519 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Riceville, or 18 miles west of Cresco, moving east
  at 50 mph.

  HAZARD...Tornado. 

  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...
  Lime Springs around 530 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Chester, Hayden Prairie and County V 10 And 40th Street.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4350 9255 4350 9208 4345 9208 4340 9255
TIME...MOT...LOC 2219Z 261DEG 43KT 4342 9248 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

RRS

1 follow-up statement

683 
WWUS53 KARX 192229
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
529 PM CDT WED JUL 19 2017

IAC089-192238-
/O.CAN.KARX.TO.W.0020.000000T0000Z-170719T2245Z/
Howard IA-
529 PM CDT WED JUL 19 2017

...THE TORNADO WARNING FOR NORTHERN HOWARD COUNTY IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

A severe thunderstorm watch remains in effect until 900 PM CDT for
northeastern Iowa.

LAT...LON 4350 9255 4350 9208 4345 9208 4340 9255
TIME...MOT...LOC 2227Z 261DEG 43KT 4344 9232 

$$

RRS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 4:04 PM CDT	Special Weather Statement	ARX	Chickasaw, Floyd, Howard, Mitchell	86 min
Jul 19, 4:25 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	65 min
Jul 19, 4:57 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Howard, Winneshiek	63 min
Jul 19, 5:04 PM CDT	Tornado Warning	ARX	Mitchell	10 min
Jul 19, 5:13 PM CDT	Tornado Warning	ARX	Howard	32 min
Jul 19, 5:25 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton, Fayette, Winneshiek	80 min
Jul 19, 5:44 PM CDT	Tornado Warning	ARX	Winneshiek	13 min
Jul 19, 5:47 PM CDT	Tornado Warning	ARX	Fayette	11 min
Jul 19, 5:54 PM CDT	Tornado Warning	ARX	Clayton	24 min

Nearby

Tornado Warnings in Iowa, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.