Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 47, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 19, 2018, 4:37 PM CDT for Marshall County, Tama County, Iowa. It was in force for 23 min. 3 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, 4:37 PM CDT (21:37 UTC)
- Expired
- Jul 19, 2018, 5:00 PM CDT
- In force
- 23 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Emergency
- Tornado emergency
- Tornado
- Observed
- Damage threat
- Catastrophic
- Hail
- 1.0 in
Counties Marshall County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 85 km from the middle of the area, began a volume at 21:41 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, 4:50 PM CDT | TORNADO | Marshalltown, IA | MARSHALLTOWN COURTHOUSE LOST CLOCK TOWER. TREES DOWN ALL OVER TOWN. |
| Jul 19, 4:52 PM CDT | TORNADO | Le Grand, IA | |
| Jul 19, 4:55 PM CDT | TORNADO | 2 Nw Marshalltown, IA | REPORTS OF CATASTROPHIC DAMAGE, INCLUDING VEHICLES MISSING, VEHICLES OVERTURNED, TOPS OF BUILDINGS GONE, TREES DOWN, POWER LINES, GAS LINES, ETC... |
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, 9.6 hours before the alert went out and 190 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.
041
WFUS53 KDMX 192137
TORDMX
IAC127-171-192200-
/O.NEW.KDMX.TO.W.0047.180719T2137Z-180719T2200Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
437 PM CDT THU JUL 19 2018
...TORNADO EMERGENCY FOR MARSHALLTOWN...
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Eastern Marshall County in central Iowa...
Southwestern Tama County in central Iowa...
* Until 500 PM CDT.
* At 437 PM CDT, a confirmed large and destructive tornado was
observed over Marshalltown, moving east at 25 mph.
TORNADO EMERGENCY for Marshalltown. This is a PARTICULARLY
DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Deadly tornado.
SOURCE...Law enforcement confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris
may be deadly to those caught without shelter. Mobile
homes will be destroyed. Considerable damage to homes,
businesses, and vehicles is likely and complete
destruction is possible.
* The tornado will be near...
Meskwaki Casino around 500 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Garwin, Gilman, Le Grand, Ferguson, Green Mountain, Montour,
Marshalltown Municipal Airport, Toledo Municipal Airport and Albion.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, TAKE COVER NOW! Move
to an interior room on the lowest floor of a sturdy building. Avoid
windows. If in a mobile home, a vehicle or outdoors.. Move to the
closest substantial shelter and protect yourself from flying debris.
&&
LAT...LON 4186 9261 4186 9276 4199 9305 4215 9296
4207 9251
TIME...MOT...LOC 2137Z 291DEG 21KT 4205 9292
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CATASTROPHIC
HAIL...1.00IN
$$
Johnson1 follow-up statement
700
WWUS53 KDMX 192146 RRA
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
446 PM CDT THU JUL 19 2018
IAC127-171-192200-
/O.CON.KDMX.TO.W.0047.000000T0000Z-180719T2200Z/
Marshall IA-Tama IA-
446 PM CDT THU JUL 19 2018
...TORNADO EMERGENCY FOR MARSHALLTOWN!...
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR EASTERN
MARSHALL AND SOUTHWESTERN TAMA COUNTIES...
At 446 PM CDT, a confirmed large and destructive tornado was located
over Marshalltown, moving east at 20 mph.
TORNADO EMERGENCY for Marshalltown. This is a PARTICULARLY DANGEROUS
SITUATION. TAKE COVER NOW!
HAZARD...Deadly tornado.
SOURCE...Law enforcement confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes
will be destroyed. Considerable damage to homes,
businesses, and vehicles is likely and complete destruction
is possible.
The tornado will be near...
Meskwaki Casino around 500 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Garwin, Gilman, Le Grand, Ferguson, Green Mountain, Montour,
Marshalltown Municipal Airport, Toledo Municipal Airport and Albion.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a large, extremely dangerous, and potentially deadly
tornado is on the ground. To protect your life, TAKE COVER NOW! Move
to an interior room on the lowest floor of a sturdy building. Avoid
windows. If in a mobile home, a vehicle or outdoors, move to the
closest substantial shelter and protect yourself from flying debris.
&&
LAT...LON 4186 9261 4186 9276 4199 9305 4215 9296
4207 9251
TIME...MOT...LOC 2146Z 291DEG 17KT 4204 9285
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CATASTROPHIC
HAIL...1.00IN
$$
JohnsonThe 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, 4:52 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.