Alert archive / Iowa / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 230, NWS Des Moines, IA

September 18, 2019Mahaska County, Marion County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Sep 18, 2019, 4:40 PM CDT for Mahaska County, Marion County, Iowa. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 18, 2019, 4:40 PM CDT (21:40 UTC)
Expired: Sep 18, 2019, 5:15 PM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Mahaska County, IA, Marion County, IA

The radar

The Des Moines radar (KDMX), 84 km from the middle of the area, began a volume at 21:42 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 forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 18, 4:29 PM CDT, 11 minutes earlier.

Area forecast discussion, Sep 18, 4:29 PM CDT, 11 minutes before

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Hazardous weather outlook, Sep 18, 3:33 PM CDT, 1 hour 7 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
333 PM CDT Wed Sep 18 2019

IAZ004>007-015>017-023>028-037>039-049-050-061-062-074-082-083-
092-093-191100-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Hardin-Grundy-
Black Hawk-Marshall-Tama-Jasper-Poweshiek-Marion-Union-Clarke-
Taylor-Ringgold-
333 PM CDT Wed Sep 18 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Thunderstorms are likely at times through this evening and again
overnight into early Thursday. The threat of severe weather is
low, but locally heavy rainfall is possible, especially late
tonight into early Thursday morning.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thunderstorms will linger into Thursday, with a low threat of
severe weather but with a possibility of locally heavy rainfall.

Intermittent thunderstorm chances remain in the forecast from
Friday through Sunday, then again around Tuesday. At this time it
appears the highest storm chances will come from Friday night
through Saturday. The potential for the severe weather and heavy
rain during this time will be refined in the coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is unlikely, but any reports of heavy rain or
flooding are always appreciated.

IAZ033>036-044>048-057>060-070>073-081-191100-
Sac-Calhoun-Webster-Hamilton-Crawford-Carroll-Greene-Boone-Story-
Audubon-Guthrie-Dallas-Polk-Cass-Adair-Madison-Warren-Adams-
333 PM CDT Wed Sep 18 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

A Flash Flood Watch is in effect for the area tonight through
Thursday morning. Please refer to the National Weather Service
website at weather.gov/desmoines for further details.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

A Flash Flood Watch is in effect for the area through Thursday
morning. Please refer to the National Weather Service website at
weather.gov/desmoines for further details.

Intermittent thunderstorm chances remain in the forecast from
Friday through Sunday, then again around Tuesday. At this time it
appears the highest storm chances will come from Friday night
through Saturday. The potential for the severe weather and heavy
rain during this time will be refined in the coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is unlikely, but any reports of heavy rain or
flooding are always appreciated.

IAZ075-084>086-094>097-191100-
Mahaska-Lucas-Monroe-Wapello-Decatur-Wayne-Appanoose-Davis-
333 PM CDT Wed Sep 18 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Scattered, non severe thunderstorms will linger through this
evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Intermittent thunderstorm chances return to the forecast from
late Friday through Sunday, then again around Tuesday. At this
time it appears the highest storm chances will come from Friday
night through Saturday. The potential for the severe weather and
heavy rain during this time will be refined in the coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is unlikely.

Lee

In the hours before

Special weather statement, Sep 18, 2:01 PM CDT, 2 hours 39 minutes before

Special Weather Statement
National Weather Service Des Moines IA
201 PM CDT Wed Sep 18 2019

IAZ038-039-050-181930-
Black Hawk IA-Tama IA-Grundy IA-
201 PM CDT Wed Sep 18 2019

...Strong Thunderstorm Moving Across Far Northern Tama County...

At 159 PM CDT, Doppler radar was tracking a strong thunderstorm just
northwest of Traer, or about 15 miles south of Waterloo, moving east
northeast at 20 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
La Porte City, Traer, Reinbeck, Dysart, Washburn, Gilbertville and Tf
Clark State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4230 9230 4214 9230 4216 9266 4233 9267
      4245 9206 4230 9206
TIME...MOT...LOC 1859Z 255DEG 18KT 4229 9246

Lee

Local storm report, Sep 18, 2:44 PM CDT, 1 hour 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
244 PM CDT WED SEP 18 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0215 PM     TSTM WND DMG     5 N DYSART              42.24N 92.30W
09/18/2019                   TAMA               IA   TRAINED SPOTTER

            TREE BRANCH SNAPPED OFF. WINDS ESTIMATED
            AROUND 60 MPH.

&&

ANSORGE

Local storm report, Sep 18, 2:52 PM CDT, 1 hour 48 minutes before

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Special weather statement, Sep 18, 4:14 PM CDT, 26 minutes before

Special Weather Statement
National Weather Service Des Moines IA
414 PM CDT Wed Sep 18 2019

IAZ061-062-074-075-085-086-182215-
Wapello IA-Poweshiek IA-Marion IA-Jasper IA-Mahaska IA-Monroe IA-
414 PM CDT Wed Sep 18 2019

...STRONG THUNDERSTORMS MOVING THROUGH THE AREA...

At 413 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Montezuma to 11 miles southeast of
Knoxville. Movement was east at 30 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Newton, Oskaloosa, Pella, Grinnell, Montezuma, New Sharon, Eddyville,
Ottumwa Industrial Airport, Lake Red Rock, Sully, Fremont, Lovilia,
Beacon, University Park, Bussey, Lynnville, Deep River, Harvey,
Barnes City and Rose Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Des Moines .

&&

LAT...LON 4113 9304 4172 9300 4167 9230 4151 9230
      4151 9241 4116 9241 4116 9218 4108 9218
TIME...MOT...LOC 2113Z 271DEG 21KT 4164 9260 4123 9293

Boksa

Special weather statement, Sep 18, 4:25 PM CDT, 15 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 18, 5:36 AM CDT	Special Weather Statement	DMX	Emmet, Kossuth, Palo Alto	54 min
Sep 18, 7:06 AM CDT	Special Weather Statement	DMX	Emmet, Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas and 2 more	54 min
Sep 18, 2:01 PM CDT	Special Weather Statement	DMX	Black Hawk	29 min
Sep 18, 2:45 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	15 min
Sep 18, 3:36 PM CDT	Flood Watch	DMX	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 12 more	4 hr
Sep 18, 4:14 PM CDT	Special Weather Statement	DMX	Mahaska, Poweshiek	61 min
Sep 18, 4:25 PM CDT	Special Weather Statement	DMX	Hancock	50 min
Sep 18, 4:43 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	17 min
Sep 18, 6:07 PM CDT	Special Weather Statement	DMX	Wapello	8 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2019 Every severe thunderstorm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.