Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 61, NWS Des Moines, IA

October 8, 2018Clarke County, Lucas County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Oct 8, 2018, 7:59 PM CDT for Clarke County, Lucas County, Warren County, Iowa. It was in force for 31 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: Oct 8, 2018, 7:59 PM CDT (00:59 UTC)
Expired: Oct 8, 2018, 8:30 PM CDT
In force: 31 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

Counties Clarke County, IA, Lucas County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 58 km from the middle of the area, began a volume at 01:02 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
Oct 8, 5:33 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.0 hours before the alert went out and 240 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: 760 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

809 
WFUS53 KDMX 090059
TORDMX
IAC039-117-181-090130-
/O.NEW.KDMX.TO.W.0061.181009T0059Z-181009T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
759 PM CDT MON OCT 8 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northwestern Lucas County in south central Iowa...
  Northeastern Clarke County in south central Iowa...
  Southeastern Warren County in south central Iowa...

* Until 830 PM CDT.
    
* At 759 PM CDT, a tornado producing storm was located 12 miles
  northeast of Osceola, moving northeast at 35 mph.

  HAZARD...Damaging tornado.

  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 tornadic storm will be near...
  Indianola around 825 PM CDT.

Other locations impacted by this tornadic thunderstorm include Otter
Creek County Park, Ackworth, Milo, Sandyville and Lake Ahquabi State
Park.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4114 9365 4143 9352 4135 9333 4126 9333
      4109 9355
TIME...MOT...LOC 0059Z 210DEG 30KT 4113 9358 

TORNADO...OBSERVED
HAIL...<.75IN

$$

Small

2 follow-up statements

567 
WWUS53 KDMX 090110
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
810 PM CDT MON OCT 8 2018

IAC039-117-090120-
/O.CAN.KDMX.TO.W.0061.000000T0000Z-181009T0130Z/
Lucas IA-Clarke IA-
810 PM CDT MON OCT 8 2018

...THE TORNADO WARNING FOR NORTHWESTERN LUCAS AND NORTHEASTERN CLARKE
COUNTIES 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 4116 9364 4143 9352 4135 9333 4126 9333
      4116 9346
TIME...MOT...LOC 0110Z 210DEG 30KT 4121 9352 

$$

IAC181-090130-
/O.CON.KDMX.TO.W.0061.000000T0000Z-181009T0130Z/
Warren IA-
810 PM CDT MON OCT 8 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR
SOUTHEASTERN WARREN COUNTY...
    
At 810 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles south of Indianola, moving northeast at 35 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...
  Indianola around 830 PM CDT.

Other locations impacted by this tornadic thunderstorm include Otter
Creek County Park, Ackworth, Milo, Sandyville and Lake Ahquabi State
Park.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4116 9364 4143 9352 4135 9333 4126 9333
      4116 9346
TIME...MOT...LOC 0110Z 210DEG 30KT 4121 9352 

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

$$

Small

272 
WWUS53 KDMX 090123
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
823 PM CDT MON OCT 8 2018

IAC181-090132-
/O.EXP.KDMX.TO.W.0061.000000T0000Z-181009T0130Z/
Warren IA-
823 PM CDT MON OCT 8 2018

...THE TORNADO WARNING FOR SOUTHEASTERN WARREN COUNTY WILL EXPIRE AT
830 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
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.

LAT...LON 4116 9364 4143 9352 4135 9333 4126 9333
      4116 9346
TIME...MOT...LOC 0122Z 210DEG 30KT 4129 9346 

$$

Small

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 7:11 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	34 min
Oct 8, 7:23 PM CDT	Tornado Warning	DMX	Clarke, Decatur	37 min
Oct 8, 9:54 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	21 min
Oct 8, 10:03 PM CDT	Tornado Warning	DMX	Poweshiek	15 min
Oct 8, 10:26 PM CDT	River Flood Warning	DMX	Polk	7 days
Oct 8, 10:26 PM CDT	River Flood Warning	DMX	Polk	7 days
Oct 8, 10:31 PM CDT	River Flood Watch	DMX	Decatur	3 hr
Oct 9, 12:58 AM CDT	River Flood Warning	DMX	Decatur	4 days
Oct 9, 1:48 AM CDT	Areal Flood Warning	DMX	Clarke, Decatur, Jasper, Lucas, Mahaska, Marion and 6 more	24 hr
Oct 9, 2:49 AM CDT	River Flood Warning	DMX	Polk, Story	3 days
Oct 9, 6:39 AM CDT	River Flood Warning	DMX	Marshall	7 days
Oct 9, 6:39 AM CDT	River Flood Warning	DMX	Black Hawk	6 days
Oct 9, 6:39 AM CDT	River Flood Warning	DMX	Dallas, Greene	5 days
Oct 9, 10:20 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	35 hr
Oct 9, 10:20 AM CDT	River Flood Warning	DMX	Lucas, Wayne	64 hr
Oct 9, 11:33 AM CDT	River Flood Warning	DMX	Dallas, Polk	6 days
Oct 9, 12:38 PM CDT	River Flood Watch	DMX	Davis, Wapello	10 hr
Oct 9, 2:16 PM CDT	Tornado Warning	DMX	Mahaska, Marion, Monroe	29 min
Oct 9, 3:22 PM CDT	River Flood Warning	DMX	Story	7 hr
Oct 9, 3:22 PM CDT	River Flood Warning	DMX	Story	20 hr
Oct 9, 3:32 PM CDT	Tornado Warning	DMX	Appanoose, Monroe	43 min
Oct 9, 3:42 PM CDT	Tornado Warning	DMX	Mahaska, Marion, Monroe	22 min
Oct 9, 4:21 PM CDT	Tornado Warning Tornado observed	DMX	Poweshiek, Tama	24 min
Oct 9, 4:28 PM CDT	Tornado Warning	DMX	Ringgold, Taylor	47 min
Oct 9, 4:47 PM CDT	River Flood Watch	DMX	Jasper, Marion, Polk	29 hr
Oct 9, 4:58 PM CDT	Tornado Warning Tornado observed	DMX	Tama	32 min
Oct 9, 4:59 PM CDT	Tornado Warning	DMX	Jasper, Poweshiek	31 min
Oct 9, 5:13 PM CDT	Tornado Warning	DMX	Adair, Adams, Union	32 min
Oct 9, 5:44 PM CDT	Tornado Warning Tornado observed	DMX	Adair	46 min
Oct 9, 6:11 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Dallas, Guthrie	49 min
Oct 9, 6:30 PM CDT	Tornado Warning	DMX	Polk, Warren	30 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.