Alert archive / Iowa / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 140, NWS Des Moines, IA

July 13, 2023Hancock County, Kossuth County, Winnebago County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 13, 2023, 2:19 PM CDT for Hancock County, Kossuth County, Winnebago County, Iowa. It was in force for 41 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
Jul 13, 2023, 2:19 PM CDT (19:19 UTC)
Expired
Jul 13, 2023, 3:00 PM CDT
In force
41 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Hancock County, IA, Kossuth County, IA, Winnebago County, IA

The radar

The Des Moines radar (KDMX), 166 km from the middle of the area, began a volume at 19:19 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 7.3 hours before the alert went out and 183 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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2023-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 139 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2023-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
139 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Jul 13, 12:32 PM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Jul 13, 12:32 PM CDT, 1 hour 47 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Jul 13, 2:13 PM CDT, 6 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
213 PM CDT Thu Jul 13 2023

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-141915-
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-
213 PM CDT Thu Jul 13 2023

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Scattered thunderstorms return this afternoon into tonight. A few
stronger storms are possible, mainly in northern Iowa, with gusty
winds the primary threat, though some hail may be possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Some storms may linger into early Friday morning with additional
thunderstorm chances Friday afternoon and evening. A few stronger
storms could occur, mainly in southern Iowa, with locally heavy
rainfall also possible.

Thunderstorm chances continue into the weekend, most likely from
Sunday into Sunday night. The severe threat remains uncertain at
this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

In the hours before

Local storm report, Jul 13, 9:13 AM CDT, 5 hours 6 minutes before
Preliminary Local Storm Report
National Weather Service Des Moines IA
913 AM CDT Thu Jul 13 2023

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

0755 AM     Tstm Wnd Dmg     Lorimor                 41.13N 94.05W
07/12/2023                   Union              IA   Emergency Mngr

            Trees down on the road. Delayed report.

&&

JAZ
Special weather statement, Jul 13, 1:53 PM CDT, 26 minutes before
Special Weather Statement
National Weather Service Des Moines IA
153 PM CDT Thu Jul 13 2023

IAZ004>007-016-017-132000-
Cerro Gordo IA-Kossuth IA-Winnebago IA-Worth IA-Emmet IA-Hancock IA-
153 PM CDT Thu Jul 13 2023

...A strong thunderstorm will impact portions of northern Emmet,
Worth, northern Kossuth, northern Hancock, Cerro Gordo and Winnebago
Counties through 300 PM CDT...

At 153 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Elmore, or 23 miles north of Algona, moving east at 40
mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Forest City, Mason City, Manly, Mason City Municipal Airport and
  Clear Lake.

This includes Interstate 35 between mile markers 184 and 218.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4350 9303 4291 9303 4291 9310 4350 9492
TIME...MOT...LOC 1853Z 286DEG 33KT 4340 9413

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

Donavon

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 1:53 PM CDTSpecial Weather StatementDMXCerro Gordo, Winnebago, Worth67 min
Jul 13, 2:25 PM CDTSevere Thunderstorm WarningDMXWinnebago23 min
Jul 13, 2:51 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Hancock, Wright39 min
Jul 13, 3:39 PM CDTSevere Thunderstorm WarningDMXButler37 min
Jul 13, 5:31 PM CDTSevere Thunderstorm WarningDMXHancock44 min
Jul 13, 6:08 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Franklin, Hancock, Wright37 min
Jul 13, 6:19 PM CDTSpecial Weather StatementDMXTama26 min
Jul 13, 6:44 PM CDTSpecial Weather StatementDMXFranklin46 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2023Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.