Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 13, NWS Des Moines, IA

June 9, 2018Winnebago County, Worth County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 9, 2018, 2:57 PM CDT for Winnebago County, Worth County, Iowa. It was in force for 33 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: Jun 9, 2018, 2:57 PM CDT (19:57 UTC)
Expired: Jun 9, 2018, 3:30 PM CDT
In force: 33 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Winnebago County, IA, Worth County, IA

The radar

The Minneapolis radar (KMPX), 172 km from the middle of the area, began a volume at 19:58 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, 3:00 PM CDT	HAIL 2	Leland, 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, 8.0 hours before the alert went out and 172 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.

645 
WFUS53 KDMX 091957
TORDMX
IAC189-195-092030-
/O.NEW.KDMX.TO.W.0013.180609T1957Z-180609T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
257 PM CDT SAT JUN 9 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southwestern Worth County in north central Iowa...
  Southeastern Winnebago County in north central Iowa...

* Until 330 PM CDT.
    
* At 257 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Forest City, moving east at 35 mph.

  HAZARD...Tornado and quarter 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 tornadic thunderstorm will remain over mainly rural areas of
  southwestern Worth and southeastern Winnebago Counties, including
  the following locations... Leland and Fertile.

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.

&&

LAT...LON 4335 9340 4326 9339 4326 9355 4327 9371
      4335 9371
TIME...MOT...LOC 1957Z 276DEG 30KT 4331 9364 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Cogil

2 follow-up statements

110 
WWUS53 KDMX 092010
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
310 PM CDT SAT JUN 9 2018

IAC189-195-092030-
/O.CON.KDMX.TO.W.0013.000000T0000Z-180609T2030Z/
Worth IA-Winnebago IA-
310 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR
SOUTHWESTERN WORTH AND SOUTHEASTERN WINNEBAGO COUNTIES...
    
At 310 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Forest City, moving southeast at 20 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation. At 303 PM, a rotating wall cloud 
         was observed south of Leland.

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.

Locations impacted include...
Forest City and Fertile. 

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.

&&

LAT...LON 4333 9347 4326 9342 4326 9355 4327 9371
      4333 9361
TIME...MOT...LOC 2010Z 294DEG 16KT 4328 9358 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Cogil

356 
WWUS53 KDMX 092029
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
329 PM CDT SAT JUN 9 2018

IAC189-195-092037-
/O.EXP.KDMX.TO.W.0013.000000T0000Z-180609T2030Z/
Worth IA-Winnebago IA-
329 PM CDT SAT JUN 9 2018

...THE TORNADO WARNING FOR SOUTHWESTERN WORTH AND SOUTHEASTERN
WINNEBAGO COUNTIES WILL EXPIRE AT 330 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However, a new 
tornado warning was reissued and remains in effect for portions of 
Worth, Winnebago, Cerro Gordo and Hancock counties until 345 PM.



LAT...LON 4333 9347 4326 9342 4326 9355 4327 9371
      4333 9361
TIME...MOT...LOC 2027Z 276DEG 30KT 4327 9339 

$$

Cogil

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 9, 4:25 AM CDT	Special Weather Statement	DMX	Adams, Audubon, Carroll, Cass, Crawford, Taylor	50 min
Jun 9, 5:57 AM CDT	Areal Flood Warning	DMX	Butler	24 hr
Jun 9, 7:05 AM CDT	Special Weather Statement	DMX	Butler, Cerro Gordo, Franklin, Grundy, Hardin, Jasper and 3 more	40 min
Jun 9, 11:25 AM CDT	Flash Flood Watch	DMX	Black Hawk, Bremer, Butler, Cerro Gordo, Worth	12 hr
Jun 9, 11:46 AM CDT	Special Weather Statement	DMX	Worth	59 min
Jun 9, 2:52 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago, Worth	38 min
Jun 9, 3:20 PM CDT	Tornado Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	25 min
Jun 9, 3:37 PM CDT	Tornado Warning Tornado observed	DMX	Cerro Gordo, Hancock, Worth	22 min
Jun 9, 3:57 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo	48 min
Jun 9, 4:00 PM CDT	Flash Flood Warning	DMX	Cerro Gordo, Worth	6 hr
Jun 9, 4:07 PM CDT	Tornado Warning	DMX	Cerro Gordo	38 min
Jun 9, 5:39 PM CDT	Severe Thunderstorm Warning	DMX	Butler	66 min
Jun 9, 6:09 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	51 min
Jun 9, 6:58 PM CDT	Severe Thunderstorm Warning	DMX	Franklin	32 min

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.