Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 23, NWS Des Moines, IA

June 28, 2017Marion County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 28, 2017, 5:55 PM CDT for Marion County, Warren County, Iowa. It was in force for 35 min. 2 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 28, 2017, 5:55 PM CDT (22:55 UTC)
Expired: Jun 28, 2017, 6:30 PM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Marion County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 61 km from the middle of the area, began a volume at 22:56 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 28, 6:03 PM CDT	TORNADO	4 S Pleasantville, IA	REPORTED A FEW MILES SOUTH OF HWY 5 IN PLEASANTVILLE.
Jun 28, 6:25 PM CDT	FUNNEL CLOUD	2 Se Knoxville, 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 28, 2:53 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.9 hours before the alert went out and 232 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: 134 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1152 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

387 
WFUS53 KDMX 282255
TORDMX
IAC125-181-282330-
/O.NEW.KDMX.TO.W.0023.170628T2255Z-170628T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
555 PM CDT WED JUN 28 2017

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Central Marion County in south central Iowa...
  East central Warren County in south central Iowa...

* Until 630 PM CDT.

* At 555 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Pleasantville, or 11 miles west of Knoxville,
  moving east at 30 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...
  Pleasantville around 600 PM CDT. 
  Melcher-Dallas around 610 PM CDT. 
  Lake Red Rock around 615 PM CDT. 
  Knoxville and Knoxville Raceway around 620 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Sandyville, Knoxville Municipal Airport and Milo.

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 4129 9344 4140 9343 4142 9298 4116 9296
TIME...MOT...LOC 2255Z 275DEG 25KT 4134 9333 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Small

3 follow-up statements

612 
WWUS53 KDMX 282302
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
602 PM CDT WED JUN 28 2017

IAC125-181-282330-
/O.CON.KDMX.TO.W.0023.000000T0000Z-170628T2330Z/
Marion IA-Warren IA-
602 PM CDT WED JUN 28 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR CENTRAL
MARION AND EAST CENTRAL WARREN COUNTIES...
        
At 601 PM CDT, a confirmed tornado was located near Pleasantville, or
9 miles west of Knoxville, moving east at 30 mph.

HAZARD...Damaging tornado and quarter size hail. 

SOURCE...Radar 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 tornado will be near...
  Knoxville, Knoxville Raceway and Lake Red Rock around 620 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Knoxville Municipal Airport.

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 4130 9337 4138 9336 4142 9298 4121 9297
TIME...MOT...LOC 2301Z 274DEG 24KT 4134 9328 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Small

011 
WWUS53 KDMX 282312
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
612 PM CDT WED JUN 28 2017

IAC181-282322-
/O.CAN.KDMX.TO.W.0023.000000T0000Z-170628T2330Z/
Warren IA-
612 PM CDT WED JUN 28 2017

...THE TORNADO WARNING FOR EAST CENTRAL WARREN COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4132 9324 4139 9325 4142 9298 4129 9297
TIME...MOT...LOC 2312Z 267DEG 24KT 4137 9319 

$$

IAC125-282330-
/O.CON.KDMX.TO.W.0023.000000T0000Z-170628T2330Z/
Marion IA-
612 PM CDT WED JUN 28 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR CENTRAL
MARION COUNTY...
        
At 612 PM CDT, a confirmed tornado was located near Pleasantville, or
near Knoxville, moving east at 30 mph.

HAZARD...Damaging tornado and quarter size hail. 

SOURCE...Radar 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 tornado will be near...
  Knoxville, Knoxville Raceway and Lake Red Rock around 620 PM CDT. 

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4132 9324 4139 9325 4142 9298 4129 9297
TIME...MOT...LOC 2312Z 267DEG 24KT 4137 9319 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Small

412 
WWUS53 KDMX 282326
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
626 PM CDT WED JUN 28 2017

IAC125-282335-
/O.EXP.KDMX.TO.W.0023.000000T0000Z-170628T2330Z/
Marion IA-
626 PM CDT WED JUN 28 2017

...THE TORNADO WARNING FOR CENTRAL MARION COUNTY WILL EXPIRE AT 630
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 south central
Iowa.

Remember, a Tornado Warning still remains in effect for portions of 
northern Marion County until 645pm.

LAT...LON 4132 9324 4139 9325 4142 9298 4129 9297
TIME...MOT...LOC 2325Z 275DEG 25KT 4136 9311 

$$

Small

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 3:23 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Story	30 min
Jun 28, 3:41 AM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	23 min
Jun 28, 2:23 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Pocahontas, Webster	52 min
Jun 28, 3:06 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Pocahontas, Webster	39 min
Jun 28, 3:40 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Webster, Wright	50 min
Jun 28, 3:49 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin	41 min
Jun 28, 4:08 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Dallas, Madison	37 min
Jun 28, 4:20 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison	40 min
Jun 28, 4:22 PM CDT	Tornado Warning	DMX	Adair, Adams, Cass	23 min
Jun 28, 4:25 PM CDT	Tornado Warning	DMX	Adair, Madison	35 min
Jun 28, 4:28 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Dallas, Guthrie, Madison	32 min
Jun 28, 4:33 PM CDT	Severe Thunderstorm Warning	DMX	Bremer, Butler	42 min
Jun 28, 4:46 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Adams, Union	29 min
Jun 28, 4:49 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk, Warren	41 min
Jun 28, 4:51 PM CDT	Severe Thunderstorm Warning	DMX	Franklin, Hamilton, Hardin, Webster, Wright	39 min
Jun 28, 4:53 PM CDT	Tornado Warning	DMX	Taylor	52 min
Jun 28, 4:56 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Madison	37 min
Jun 28, 5:07 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Hardin	38 min
Jun 28, 5:11 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Polk, Story	49 min
Jun 28, 5:11 PM CDT	Tornado Warning	DMX	Adair, Madison, Union	34 min
Jun 28, 5:24 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion, Polk, Warren	24 min
Jun 28, 5:25 PM CDT	Severe Thunderstorm Warning	DMX	Marshall, Story	35 min
Jun 28, 5:35 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin	40 min
Jun 28, 5:39 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Ringgold, Taylor	66 min
Jun 28, 5:41 PM CDT	Tornado Warning	DMX	Clarke, Madison, Union	34 min
Jun 28, 5:52 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Polk, Story	2 min
Jun 28, 6:14 PM CDT	Tornado Warning Tornado observed	DMX	Jasper, Marion	31 min
Jun 28, 6:18 PM CDT	Tornado Warning	DMX	Warren	27 min
Jun 28, 6:29 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Union	22 min
Jun 28, 6:29 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Tama	46 min
Jun 28, 6:36 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	39 min
Jun 28, 6:44 PM CDT	Tornado Warning Tornado observed	DMX	Marion, Warren	31 min
Jun 28, 6:57 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin, Grundy, Hardin	48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.