Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 64, NWS Des Moines, IA

October 9, 2018Appanoose County, Monroe County, Iowa

NWS Des Moines, IA issued this tornado warning at Oct 9, 2018, 3:32 PM CDT for Appanoose County, Monroe County, Iowa. It was in force for 43 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: Oct 9, 2018, 3:32 PM CDT (20:32 UTC)
Expired: Oct 9, 2018, 4:15 PM CDT
In force: 43 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Appanoose County, IA, Monroe County, IA

The radar

The Des Moines radar (KDMX), 127 km from the middle of the area, began a volume at 20:34 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
Oct 9, 3:34 PM CDT	TORNADO	2 S Rathbun, IA	BRIEF TOUCHDOWN REPORTED.

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
Oct 9, 1:46 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.5 hours before the alert went out and 219 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: 459 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1071 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

626 
WFUS53 KDMX 092032
TORDMX
IAC007-135-092115-
/O.NEW.KDMX.TO.W.0064.181009T2032Z-181009T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
332 PM CDT TUE OCT 9 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southeastern Monroe County in south central Iowa...
  Northeastern Appanoose County in south central Iowa...

* Until 415 PM CDT.
    
* At 332 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Centerville, moving north at 20 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...
  Lake Sundown around 405 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Rathbun, Moravia, Mystic, Centerville Municipal Airport, Honey Creek
State Park and Numa.

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 4066 9287 4069 9299 4097 9295 4094 9264
TIME...MOT...LOC 2032Z 199DEG 16KT 4073 9290 

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

$$

Donavon

4 follow-up statements

532 
WWUS53 KDMX 092040
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
340 PM CDT TUE OCT 9 2018

IAC007-135-092115-
/O.CON.KDMX.TO.W.0064.000000T0000Z-181009T2115Z/
Monroe IA-Appanoose IA-
340 PM CDT TUE OCT 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR
SOUTHEASTERN MONROE AND NORTH CENTRAL APPANOOSE COUNTIES...
    
At 340 PM CDT, a confirmed tornado was located near Centerville,
moving north at 25 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters 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...
  Lake Sundown around 350 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Rathbun, Moravia, Mystic and Honey Creek 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.

&&

LAT...LON 4073 9284 4076 9297 4097 9295 4094 9264
TIME...MOT...LOC 2040Z 198DEG 23KT 4081 9287 

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

$$

Donavon

784 
WWUS53 KDMX 092047
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
347 PM CDT TUE OCT 9 2018

IAC007-135-092115-
/O.CON.KDMX.TO.W.0064.000000T0000Z-181009T2115Z/
Monroe IA-Appanoose IA-
347 PM CDT TUE OCT 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR
SOUTHEASTERN MONROE AND NORTH CENTRAL APPANOOSE COUNTIES...
    
At 347 PM CDT, a confirmed tornado was located near Lake Sundown, or
8 miles north of Centerville, moving north at 25 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters 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 thunderstorm will remain over mainly rural areas of
southeastern Monroe and north central Appanoose Counties, including
the following locations... Rathbun, Moravia and Honey Creek 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.

&&

LAT...LON 4077 9283 4079 9293 4097 9292 4095 9271
TIME...MOT...LOC 2047Z 198DEG 23KT 4085 9285 

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

$$

Donavon

120 
WWUS53 KDMX 092057
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
357 PM CDT TUE OCT 9 2018

IAC007-135-092115-
/O.CON.KDMX.TO.W.0064.000000T0000Z-181009T2115Z/
Monroe IA-Appanoose IA-
357 PM CDT TUE OCT 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR
SOUTHEASTERN MONROE AND NORTH CENTRAL APPANOOSE COUNTIES...
    
At 357 PM CDT, a confirmed tornado was located near Lake Sundown, or
8 miles south of Albia, moving north at 25 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters 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 thunderstorm will remain over mainly rural areas of
southeastern Monroe and north central Appanoose Counties, including
the following locations... Moravia.

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 4085 9279 4088 9289 4097 9290 4095 9271
TIME...MOT...LOC 2057Z 198DEG 23KT 4091 9282 

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

$$

Donavon

279 
WWUS53 KDMX 092105
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
405 PM CDT TUE OCT 9 2018

IAC007-135-092115-
/O.EXP.KDMX.TO.W.0064.000000T0000Z-181009T2115Z/
Monroe IA-Appanoose IA-
405 PM CDT TUE OCT 9 2018

...THE TORNADO WARNING FOR SOUTHEASTERN MONROE AND NORTH CENTRAL
APPANOOSE COUNTIES WILL EXPIRE AT 415 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.

A Tornado Watch remains in effect until 900 PM CDT for south central
Iowa.

LAT...LON 4085 9279 4088 9289 4097 9290 4095 9271
TIME...MOT...LOC 2105Z 199DEG 16KT 4094 9281 

$$

Donavon

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, 7:59 PM CDT	Tornado Warning Tornado observed	DMX	Clarke, Lucas, Warren	31 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, 3:42 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.