Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 38, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 19, 2018, 3:11 PM CDT for Jasper County, Iowa. It was in force for 34 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, 3:11 PM CDT (20:11 UTC)
- Expired
- Jul 19, 2018, 3:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.25 in
County Jasper County, IA
The radar
The Des Moines radar (KDMX), 40 km from the middle of the area, began a volume at 20:13 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, 3:31 PM CDT | FUNNEL CLOUD | 3 N Prairie City, IA | EAST OF HWY 117 AND S 60TH ST. |
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, 8.2 hours before the alert went out and 228 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.
776
WFUS53 KDMX 192011
TORDMX
IAC099-192045-
/O.NEW.KDMX.TO.W.0038.180719T2011Z-180719T2045Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
311 PM CDT THU JUL 19 2018
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Northwestern Jasper County in central Iowa...
* Until 345 PM CDT.
* At 311 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Colfax, or 10 miles east of Altoona, moving east
at 15 mph.
HAZARD...Tornado and half dollar 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...
Colfax around 320 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Prairie City Krohn Airport and Valeria.
This includes Interstate 80 between mile markers 150 and 163.
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 4161 9334 4174 9334 4179 9310 4160 9309
TIME...MOT...LOC 2011Z 278DEG 15KT 4170 9328
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
Martin3 follow-up statements
694
WWUS53 KDMX 192022
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
322 PM CDT THU JUL 19 2018
IAC099-192045-
/O.CON.KDMX.TO.W.0038.000000T0000Z-180719T2045Z/
Jasper IA-
322 PM CDT THU JUL 19 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM CDT FOR
NORTHWESTERN JASPER COUNTY...
At 322 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Colfax, or 9 miles west of Newton, moving east at 15
mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
northwestern Jasper County, including the following locations...
Prairie City Krohn Airport and Valeria.
This includes Interstate 80 between mile markers 150 and 163.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4164 9334 4174 9334 4179 9310 4160 9309
TIME...MOT...LOC 2022Z 278DEG 15KT 4169 9322
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
Martin000
WWUS53 KDMX 192030
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
330 PM CDT THU JUL 19 2018
IAC099-192045-
/O.CON.KDMX.TO.W.0038.000000T0000Z-180719T2045Z/
Jasper IA-
330 PM CDT THU JUL 19 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM CDT FOR
NORTHWESTERN JASPER COUNTY...
At 329 PM CDT, a confirmed tornado was located 4 miles south
of Colfax, or 9 miles west of Newton, moving east at 20 mph.
HAZARD...Damaging tornado and half dollar size hail.
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.
Locations impacted include...
Colfax and Prairie City Krohn Airport.
This includes Interstate 80 between mile markers 154 and 163.
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 4163 9330 4173 9325 4179 9310 4160 9309
TIME...MOT...LOC 2029Z 273DEG 19KT 4165 9321
TORNADO...OBSERVED
HAIL...1.25IN
$$
Martin991
WWUS53 KDMX 192042
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
342 PM CDT THU JUL 19 2018
IAC099-192051-
/O.EXP.KDMX.TO.W.0038.000000T0000Z-180719T2045Z/
Jasper IA-
342 PM CDT THU JUL 19 2018
...THE TORNADO WARNING FOR NORTHWESTERN JASPER COUNTY WILL EXPIRE AT
345 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. A Tornado Warning
continues for southern Jasper County until 400 PM CDT.
A Tornado Watch remains in effect until 1000 PM CDT for central Iowa.
LAT...LON 4163 9330 4173 9325 4179 9310 4160 9309
TIME...MOT...LOC 2041Z 278DEG 15KT 4164 9315
$$
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, 3:22 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, 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.