Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 45, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 19, 2018, 4:14 PM CDT for Mahaska County, Marion County, Iowa. It was in force for 31 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
- Jul 19, 2018, 4:14 PM CDT (21:14 UTC)
- Expired
- Jul 19, 2018, 4:45 PM CDT
- In force
- 31 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.75 in
Counties Mahaska County, IA, Marion County, IA
The radar
The Des Moines radar (KDMX), 86 km from the middle of the area, began a volume at 21:17 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 |
|---|---|---|---|
| Jul 19, 4:19 PM CDT | TORNADO | 2 Nw Leighton, IA | LOCATION ESTIMATED FROM RADAR. |
| Jul 19, 4:27 PM CDT | TORNADO | 4 Nnw Leighton, 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 |
|---|---|---|---|
| Jul 19, 3:11 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.2 hours before the alert went out and 194 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
- 1807 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- -21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
089
WFUS53 KDMX 192114
TORDMX
IAC123-125-192145-
/O.NEW.KDMX.TO.W.0045.180719T2114Z-180719T2145Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
414 PM CDT THU JUL 19 2018
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
East central Marion County in south central Iowa...
West central Mahaska County in south central Iowa...
* Until 445 PM CDT.
* At 413 PM CDT, a tornado was observed 1 mile east of Pella, moving
southeast at 25 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 thunderstorm will remain over mainly rural areas of
east central Marion and west central Mahaska Counties, including
the following locations... Leighton.
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 4139 9290 4144 9286 4140 9261 4124 9278
TIME...MOT...LOC 2113Z 312DEG 20KT 4141 9287
TORNADO...OBSERVED
HAIL...<.75IN
$$
Martin2 follow-up statements
708
WWUS53 KDMX 192125
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
425 PM CDT THU JUL 19 2018
IAC125-192133-
/O.CAN.KDMX.TO.W.0045.000000T0000Z-180719T2145Z/
Marion IA-
425 PM CDT THU JUL 19 2018
...THE TORNADO WARNING FOR EAST CENTRAL MARION COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for south central
Iowa.
LAT...LON 4134 9286 4144 9286 4140 9261 4124 9278
TIME...MOT...LOC 2123Z 312DEG 20KT 4137 9281
$$
IAC123-192145-
/O.CON.KDMX.TO.W.0045.000000T0000Z-180719T2145Z/
Mahaska IA-
425 PM CDT THU JUL 19 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR WEST
CENTRAL MAHASKA COUNTY...
At 419 PM CDT, a confirmed tornado was located 2 miles northwest of
Leighton , moving southeast at 25 mph.
HAZARD...Damaging tornado.
SOURCE...Emergency management 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.
Locations impacted include...
Leighton.
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 4134 9286 4144 9286 4140 9261 4124 9278
TIME...MOT...LOC 2123Z 312DEG 20KT 4137 9281
TORNADO...OBSERVED
HAIL...<.75IN
$$
Martin287
WWUS53 KDMX 192134
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
434 PM CDT THU JUL 19 2018
IAC123-192145-
/O.CON.KDMX.TO.W.0045.000000T0000Z-180719T2145Z/
Mahaska IA-
434 PM CDT THU JUL 19 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR WEST
CENTRAL MAHASKA COUNTY...
At 434 PM CDT, a severe thunderstorm capable of producing a tornado
was located 8 miles northwest of Oskaloosa, moving southeast at 25
mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Leighton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4134 9286 4142 9277 4140 9261 4124 9278
TIME...MOT...LOC 2134Z 312DEG 20KT 4133 9275
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
MartinThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 3:14 AM CDT | Special Weather Statement | DMX | Mahaska | 61 min |
| Jul 19, 12:17 PM CDT | Special Weather Statement | DMX | Emmet, Humboldt, Kossuth | 58 min |
| Jul 19, 2:41 PM CDT | Special Weather Statement | DMX | Franklin, Hamilton, Hardin, Wright | 64 min |
| Jul 19, 2:50 PM CDT | Tornado Warning | DMX | Jasper, Marshall, Polk | 25 min |
| Jul 19, 3:05 PM CDT | Tornado Warning | DMX | Franklin, Hamilton, Hardin, Wright | 40 min |
| Jul 19, 3:11 PM CDT | Tornado Warning | DMX | Jasper | 34 min |
| Jul 19, 3:22 PM CDT | Tornado Warning | DMX | Marshall, Story | 38 min |
| Jul 19, 3:26 PM CDT | Tornado Warning | DMX | Hamilton, Hardin, Marshall, Story | 34 min |
| Jul 19, 3:37 PM CDT | Tornado Warning | DMX | Jasper, Mahaska, Marion | 23 min |
| Jul 19, 3:40 PM CDT | Tornado Warning | DMX | Franklin, Hardin | 35 min |
| Jul 19, 3:54 PM CDT | Tornado Warning | DMX | Grundy, Hardin, Marshall, Story | 51 min |
| Jul 19, 3:54 PM CDT | Tornado Warning | DMX | Jasper, Mahaska, Marion | 36 min |
| Jul 19, 4:18 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 42 min |
| Jul 19, 4:36 PM CDT | Tornado Warning | DMX | Mahaska, Wapello | 24 min |
| Jul 19, 4:37 PM CDT | Tornado Warning | DMX | Marshall, Tama | 23 min |
| Jul 19, 4:52 PM CDT | Tornado Warning | DMX | Mahaska, Wapello | 38 min |
| Jul 19, 4:52 PM CDT | Tornado Warning | DMX | Marshall, Poweshiek, Tama | 38 min |
| Jul 19, 5:12 PM CDT | Tornado Warning | DMX | Poweshiek, Tama | 18 min |
| Jul 19, 5:13 PM CDT | Tornado Warning | DMX | Davis, Mahaska, Wapello | 47 min |
| Jul 19, 5:55 PM CDT | Severe Thunderstorm Warning | DMX | Davis, Wapello | 20 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.