Alert archive / Iowa / Special Weather Statements in 2023

Special Weather Statement, NWS Des Moines, IA

July 12, 2023Polk County, Iowa

NWS Des Moines, IA issued this special weather statement at Jul 12, 2023, 12:13 AM CDT for Polk County, Iowa. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 12, 2023, 12:13 AM CDT (05:13 UTC)
Expired
Jul 12, 2023, 1:00 AM CDT
In force
47 min
Issued by
NWS Des Moines, IA
Hail
0.75 in
Wind
30

County Polk County, IA

The radar

The Des Moines radar (KDMX), 21 km from the middle of the area, began a volume at 05:13 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.

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 11, 10:24 PM CDT, 1 hour 49 minutes earlier.

Area forecast discussion, Jul 11, 10:24 PM CDT, 1 hour 49 minutes before
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      <div class="status" id="status">Temporary Notice</div>
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Hazardous weather outlook, Jul 11, 3:10 PM CDT, 9 hours 3 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
310 PM CDT Tue Jul 11 2023

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-122015-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
310 PM CDT Tue Jul 11 2023

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Strong to severe thunderstorms are possible late tonight. The
main hazards will be damaging wind gusts, though hail and locally
heavy rainfall are also possible. A tornado or two cannot be ruled
out in far southern Iowa.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

The threat for severe weather continues into early Wednesday
morning with a continued threat of damaging winds, hail, and
locally heavy rainfall.

Additional storm chances will return late in the week, although
the severe potential will need to be refined in the coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight into Wednesday.

In the hours before

Special weather statement, Jul 12, 12:13 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Des Moines IA
1213 AM CDT Wed Jul 12 2023

IAZ047-048-059-060-120600-
Story IA-Boone IA-Polk IA-Dallas IA-
1213 AM CDT Wed Jul 12 2023

...A strong thunderstorm will impact portions of northern Polk,
southern Story, southeastern Boone and northeastern Dallas Counties
through 100 AM CDT...

At 1213 AM CDT, Doppler radar was tracking a strong thunderstorm over
Big Creek Lake, or 10 miles north of Johnston, moving east at 25 mph.

HAZARD...Penny size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
Ankeny, Bondurant, Polk City, Huxley, Madrid, Slater, Granger,
Woodward, Big Creek Lake, Saylorville Lake, Maxwell, Cambridge,
Elkhart, Alleman, Sheldahl and Big Creek State Park.

This includes Interstate 35 between mile markers 92 and 107.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4186 9333 4186 9335 4169 9335 4175 9388
      4189 9403 4196 9333
TIME...MOT...LOC 0513Z 272DEG 20KT 4184 9377

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH

Small

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 1:00 AM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Polk, Story45 min
Jul 12, 2:46 AM CDTSpecial Weather StatementDMXLucas44 min
Jul 12, 3:05 AM CDTSevere Thunderstorm WarningDMXLucas, Mahaska, Marion, Monroe55 min
Jul 12, 5:17 AM CDTSevere Thunderstorm WarningDMXHancock, Wright16 min
Jul 12, 5:40 AM CDTSevere Thunderstorm WarningDMXBoone, Dallas, Polk, Story50 min
Jul 12, 5:55 AM CDTFlash Flood WarningDMXBoone, Greene6 hr
Jul 12, 6:07 AM CDTSevere Thunderstorm Warning Considerable damage threatDMXAudubon, Carroll, Cass, Crawford, Sac38 min
Jul 12, 6:41 AM CDTSevere Thunderstorm Warning Considerable damage threatDMXAdair, Adams, Audubon, Cass, Crawford, Guthrie and 3 more64 min
Jul 12, 7:22 AM CDTSevere Thunderstorm WarningDMXAdair, Clarke, Decatur, Madison, Ringgold, Taylor and 1 more38 min
Jul 12, 7:41 AM CDTSevere Thunderstorm WarningDMXAdair, Boone, Clarke, Dallas, Madison, Polk and 3 more39 min
Jul 12, 7:47 AM CDTSevere Thunderstorm WarningDMXJasper, Mahaska, Poweshiek43 min
Jul 12, 7:59 AM CDTSevere Thunderstorm WarningDMXAppanoose, Clarke, Decatur, Lucas, Monroe, Ringgold and 1 more46 min
Jul 12, 8:18 AM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Polk, Poweshiek, Story, Tama42 min

Nearby

Special Weather Statements in Iowa, 2023Every special weather statement in 2023

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.