Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 12, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at May 3, 2018, 8:28 PM CDT for Marshall County, Tama County, Iowa. It was in force for 22 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
- May 3, 2018, 8:28 PM CDT (01:28 UTC)
- Expired
- May 3, 2018, 8:50 PM CDT
- In force
- 22 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Marshall County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 01:30 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 |
|---|---|---|---|
| May 3, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.5 hours before the alert went out and 184 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
- 1 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 824 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
942
WFUS53 KDMX 040128
TORDMX
IAC127-171-040215-
/O.NEW.KDMX.TO.W.0012.180504T0128Z-180504T0215Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
828 PM CDT THU MAY 3 2018
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Southeastern Marshall County in central Iowa...
Southwestern Tama County in central Iowa...
* Until 915 PM CDT.
* At 828 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Marshalltown, 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...
Meskwaki Casino around 855 PM CDT.
Toledo and Tama around 900 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Garwin, Gilman, Le Grand, Ferguson, Toledo Municipal Airport, Laurel,
Montour and Haverhill.
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 4188 9243 4186 9277 4186 9294 4204 9298
4217 9249
TIME...MOT...LOC 0128Z 242DEG 27KT 4196 9292
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Podrazik2 follow-up statements
958
WWUS53 KDMX 040148
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
848 PM CDT THU MAY 3 2018
IAC127-040157-
/O.CAN.KDMX.TO.W.0012.000000T0000Z-180504T0215Z/
Marshall IA-
848 PM CDT THU MAY 3 2018
...THE TORNADO WARNING FOR SOUTHEASTERN MARSHALL COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
LAT...LON 4188 9243 4186 9277 4210 9277 4214 9263
4217 9249
TIME...MOT...LOC 0147Z 254DEG 25KT 4201 9275
$$
IAC171-040215-
/O.CON.KDMX.TO.W.0012.000000T0000Z-180504T0215Z/
Tama IA-
848 PM CDT THU MAY 3 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
SOUTHWESTERN TAMA COUNTY...
At 847 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Meskwaki Casino, or 8 miles east of Marshalltown,
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.
Locations impacted include...
Toledo, Tama, Meskwaki Casino, Le Grand, Garwin, Montour and Toledo
Municipal Airport.
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 4188 9243 4186 9277 4210 9277 4214 9263
4217 9249
TIME...MOT...LOC 0147Z 254DEG 25KT 4201 9275
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
Podrazik238
WWUS53 KDMX 040150
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
850 PM CDT THU MAY 3 2018
IAC171-040200-
/O.CAN.KDMX.TO.W.0012.000000T0000Z-180504T0215Z/
Tama IA-
850 PM CDT THU MAY 3 2018
...THE TORNADO WARNING FOR SOUTHWESTERN TAMA COUNTY IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled. However small hail and
heavy rain are still possible with this thunderstorm.
LAT...LON 4188 9243 4186 9277 4210 9277 4214 9263
4217 9249
TIME...MOT...LOC 0148Z 242DEG 27KT 4202 9272
$$
PodrazikThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 7:25 PM CDT | Tornado Warning | DMX | Jasper, Marion, Polk, Warren | 35 min |
| May 3, 7:36 PM CDT | Tornado Warning | DMX | Marion, Warren | 24 min |
| May 3, 7:45 PM CDT | Tornado Warning | DMX | Jasper, Marion | 30 min |
| May 3, 7:50 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Story | 55 min |
| May 3, 7:54 PM CDT | Tornado Warning | DMX | Marion | 36 min |
| May 3, 8:23 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Tama | 52 min |
| May 3, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 42 min |
| May 3, 9:11 PM CDT | Special Weather Statement | DMX | Black Hawk | 64 min |
| May 3, 9:26 PM CDT | River Flood Warning | DMX | Black Hawk | 6 days |
| May 3, 9:30 PM CDT | River Flood Watch | DMX | Black Hawk | 5 days |
| May 3, 9:30 PM CDT | River Flood Watch | DMX | Wright | 37 hr |
| May 3, 9:30 PM CDT | River Flood Watch | DMX | Polk | 13 hr |
| May 3, 9:30 PM CDT | River Flood Warning | DMX | Webster | 6 days |
| May 4, 12:33 AM CDT | Special Weather Statement | DMX | Black Hawk, Bremer | 27 min |
| May 4, 10:29 AM CDT | River Flood Warning | DMX | Black Hawk, Bremer, Butler | 70 hr |
| May 4, 10:29 AM CDT | River Flood Warning | DMX | Black Hawk | 72 hr |
| May 4, 10:29 AM CDT | River Flood Warning | DMX | Black Hawk, Bremer, Butler | 66 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.