Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 60, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Oct 8, 2018, 7:23 PM CDT for Clarke County, Decatur County, Iowa. It was in force for 37 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
- Oct 8, 2018, 7:23 PM CDT (00:23 UTC)
- Expired
- Oct 8, 2018, 8:00 PM CDT
- In force
- 37 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Clarke County, IA, Decatur County, IA
The radar
The Des Moines radar (KDMX), 84 km from the middle of the area, began a volume at 00:26 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 8, 7:56 PM CDT | TORNADO | 8 N Woodburn, IA | DAMAGE TO HOME IN THE 1200 BLOCK OF 330TH AVE. TIME ESTIMATED VIA RADAR. |
| Oct 8, 8:00 PM CDT | TSTM WND DMG | 1 Sse Osceola, IA | IDOT PASSED ON REPORT OF TREE BLOCKING ONE LANE ALONG HIGHWAY 69 SOUTH OF OSCEOLA. TREE WAS TOO BIG TO MOVE BY HAND. DELAYED REPORT. |
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 8, 5:33 PM CDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.4 hours before the alert went out and 221 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.
- 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
The text
As transmitted.
129
WFUS53 KDMX 090023
TORDMX
IAC039-053-090100-
/O.NEW.KDMX.TO.W.0060.181009T0023Z-181009T0100Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
723 PM CDT MON OCT 8 2018
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Northwestern Decatur County in south central Iowa...
Clarke County in south central Iowa...
* Until 800 PM CDT.
* At 722 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles northwest of Leon, moving northeast 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...
Lakeside Casino around 745 PM CDT.
Osceola around 750 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Weldon, Van Wert and Woodburn.
This includes Interstate 35 between mile markers 18 and 43.
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 4084 9395 4116 9383 4116 9356 4106 9356
4079 9379
TIME...MOT...LOC 0022Z 208DEG 26KT 4087 9385
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Small2 follow-up statements
679
WWUS53 KDMX 090031
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
731 PM CDT MON OCT 8 2018
IAC053-090040-
/O.CAN.KDMX.TO.W.0060.000000T0000Z-181009T0100Z/
Decatur IA-
731 PM CDT MON OCT 8 2018
...THE TORNADO WARNING FOR NORTHWESTERN DECATUR COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for south central
Iowa.
LAT...LON 4116 9383 4116 9356 4106 9356 4090 9370
4090 9393
TIME...MOT...LOC 0030Z 216DEG 28KT 4092 9379
$$
IAC039-090100-
/O.CON.KDMX.TO.W.0060.000000T0000Z-181009T0100Z/
Clarke IA-
731 PM CDT MON OCT 8 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR CENTRAL
CLARKE COUNTY...
At 730 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Osceola, 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...
Lakeside Casino around 740 PM CDT.
Osceola around 745 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Woodburn.
This includes Interstate 35 between mile markers 25 and 42.
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 9383 4116 9356 4106 9356 4090 9370
4090 9393
TIME...MOT...LOC 0030Z 216DEG 28KT 4092 9379
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Small819
WWUS53 KDMX 090040
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
740 PM CDT MON OCT 8 2018
IAC039-090100-
/O.CON.KDMX.TO.W.0060.000000T0000Z-181009T0100Z/
Clarke IA-
740 PM CDT MON OCT 8 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
NORTHEASTERN CLARKE COUNTY...
At 740 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Osceola, moving northeast at 40 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
northeastern Clarke County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
&&
LAT...LON 4116 9372 4116 9356 4106 9356 4096 9372
4098 9377
TIME...MOT...LOC 0040Z 212DEG 36KT 4101 9371
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
SmallThe 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, 7:59 PM CDT | Tornado Warning | 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, 3:32 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 | 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 | 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 | DMX | Adair | 46 min |
| Oct 9, 6:11 PM CDT | Tornado Warning | DMX | Adair, Dallas, Guthrie | 49 min |
| Oct 9, 6:30 PM CDT | Tornado Warning | DMX | Polk, Warren | 30 min |
Nearby
Tornado Warnings in Iowa, 2018Every tornado warning in 2018Tornadoes 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.