Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 16, NWS Des Moines, IA

June 9, 2018Cerro Gordo County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 9, 2018, 4:07 PM CDT for Cerro Gordo County, Iowa. It was in force for 38 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: Jun 9, 2018, 4:07 PM CDT (21:07 UTC)
Expired: Jun 9, 2018, 4:45 PM CDT
In force: 38 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

County Cerro Gordo County, IA

The radar

The Des Moines radar (KDMX), 156 km from the middle of the area, began a volume at 21:10 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
Jun 9, 2:26 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.1 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: 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.

098 
WFUS53 KDMX 092107
TORDMX
IAC033-092145-
/O.NEW.KDMX.TO.W.0016.180609T2107Z-180609T2145Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  East central Cerro Gordo County in north central Iowa...

* Until 445 PM CDT.
    
* At 407 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Mason City, moving east at 30 mph.

  HAZARD...Tornado and hail up to two inches in diameter.

  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...
  Nora Springs around 420 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Portland.

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 4299 9302 4302 9323 4312 9324 4319 9303
TIME...MOT...LOC 2107Z 254DEG 25KT 4307 9314 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

Cogil

2 follow-up statements

725 
WWUS53 KDMX 092119
SVSDMX

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

IAC033-092145-
/O.CON.KDMX.TO.W.0016.000000T0000Z-180609T2145Z/
Cerro Gordo IA-
419 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR EAST
CENTRAL CERRO GORDO COUNTY...
    
At 419 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Nora Springs, or 7 miles southeast of Mason City,
moving east at 20 mph.

HAZARD...Tornado and two inch 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...
  Nora Springs around 430 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Portland.

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 4299 9302 4303 9315 4314 9318 4319 9303
TIME...MOT...LOC 2119Z 260DEG 18KT 4309 9308 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

Cogil

336 
WWUS53 KDMX 092140
SVSDMX

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

IAC033-092149-
/O.EXP.KDMX.TO.W.0016.000000T0000Z-180609T2145Z/
Cerro Gordo IA-
440 PM CDT SAT JUN 9 2018

...THE TORNADO WARNING FOR EAST CENTRAL CERRO GORDO COUNTY WILL
EXPIRE AT 445 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

A Tornado Watch remains in effect until 1000 PM CDT for north central
Iowa.

LAT...LON 4299 9302 4303 9315 4314 9318 4319 9303
TIME...MOT...LOC 2139Z 254DEG 25KT 4313 9291 

$$

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, 2:57 PM CDT	Tornado Warning	DMX	Winnebago, Worth	33 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.