Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 49, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 19, 2018, 4:52 PM CDT for Marshall County, Poweshiek County, Tama County, Iowa. It was in force for 38 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
- Jul 19, 2018, 4:52 PM CDT (21:52 UTC)
- Expired
- Jul 19, 2018, 5:30 PM CDT
- In force
- 38 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.75 in
Counties Marshall County, IA, Poweshiek County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 85 km from the middle of the area, began a volume at 21:53 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, 4:52 PM CDT | TORNADO | Le Grand, 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, 9.9 hours before the alert went out and 192 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.
928
WFUS53 KDMX 192152 RRA
TORDMX
IAC127-157-171-192230-
/O.NEW.KDMX.TO.W.0049.180719T2152Z-180719T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
452 PM CDT THU JUL 19 2018
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Northern Poweshiek County in central Iowa...
Northeastern Marshall County in central Iowa...
Southwestern Tama County in central Iowa...
* Until 530 PM CDT.
* At 451 PM CDT, a confirmed tornado was located near Marshalltown,
moving east at 20 mph.
HAZARD...Damaging tornado. This warning replaces the prior tornado
emergency which was in effect for Marshalltown.
SOURCE...Law enforcement 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.
* The tornado will be near...
Meskwaki Casino around 520 PM CDT.
Toledo and Tama around 530 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Garwin, Le Grand, Toledo Municipal Airport, Green Mountain, Montour,
Union Grove State Park, Marshalltown Municipal Airport and Ferguson.
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 4196 9295 4214 9291 4213 9248 4186 9252
TIME...MOT...LOC 2151Z 279DEG 16KT 4204 9283
TORNADO...OBSERVED
HAIL...<.75IN
$$
Johnson2 follow-up statements
838
WWUS53 KDMX 192202
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
502 PM CDT THU JUL 19 2018
IAC127-192212-
/O.CAN.KDMX.TO.W.0049.000000T0000Z-180719T2230Z/
Marshall IA-
502 PM CDT THU JUL 19 2018
...THE TORNADO WARNING FOR NORTHEASTERN MARSHALL COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning hasmoved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for central Iowa.
LAT...LON 4192 9276 4214 9276 4213 9248 4186 9252
TIME...MOT...LOC 2202Z 279DEG 16KT 4203 9276
$$
IAC157-171-192230-
/O.CON.KDMX.TO.W.0049.000000T0000Z-180719T2230Z/
Poweshiek IA-Tama IA-
502 PM CDT THU JUL 19 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR NORTHERN
POWESHIEK AND SOUTHWESTERN TAMA COUNTIES...
At 502 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Meskwaki Casino, or 7 miles east of Marshalltown,
moving east at 20 mph.
HAZARD...Tornado and quarter size hail.
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 520 PM CDT.
Toledo and Tama around 530 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Garwin, Montour, Union Grove State Park 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 4192 9276 4214 9276 4213 9248 4186 9252
TIME...MOT...LOC 2202Z 279DEG 16KT 4203 9276
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
Johnson574
WWUS53 KDMX 192228
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
528 PM CDT THU JUL 19 2018
IAC157-171-192238-
/O.EXP.KDMX.TO.W.0049.000000T0000Z-180719T2230Z/
Poweshiek IA-Tama IA-
528 PM CDT THU JUL 19 2018
...THE TORNADO WARNING FOR NORTHERN POWESHIEK AND SOUTHWESTERN TAMA
COUNTIES WILL EXPIRE AT 530 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1000 PM CDT for central Iowa.
LAT...LON 4192 9276 4214 9276 4213 9248 4186 9252
TIME...MOT...LOC 2228Z 279DEG 16KT 4201 9261
$$
CURTISThe 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, 4:14 PM CDT | Tornado Warning | DMX | Mahaska, Marion | 31 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, 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.