Alert archive / Iowa / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 96, NWS Des Moines, IA

June 24, 2023Calhoun County, Greene County, Webster County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 24, 2023, 2:12 PM CDT for Calhoun County, Greene County, Webster County, Iowa. It was in force for 48 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: Jun 24, 2023, 2:12 PM CDT (19:12 UTC)
Expired: Jun 24, 2023, 3:00 PM CDT
In force: 48 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, IA, Greene County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 83 km from the middle of the area, began a volume at 19:13 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 24, 1:35 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.2 hours before the alert went out and 195 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 289 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1053 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

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 Jun 24, 12:26 PM CDT, 1 hour 46 minutes earlier.

Area forecast discussion, Jun 24, 12:26 PM CDT, 1 hour 46 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, Jun 24, 3:29 AM CDT, 10 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
329 AM CDT Sat Jun 24 2023

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-250830-
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-
329 AM CDT Sat Jun 24 2023

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Thunderstorms will cross western Iowa this morning. Some storms
may be severe with damaging winds. These initial storms are
expected to weaken as they move into central Iowa, although
lightning will remain a threat.

Another round of storms is expected to develop this afternoon
over central Iowa. In addition to the risk of lightning, this
second round will have the potential to become severe with large
hail, damaging wind, and tornadoes all possible.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Storm chances will linger Sunday across the northeast half of the
state. These storms appear unlikely to become severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely today.

DMD

In the hours before

Special weather statement, Jun 24, 9:33 AM CDT, 4 hours 39 minutes before

Special Weather Statement
National Weather Service Des Moines IA
933 AM CDT Sat Jun 24 2023

IAZ026>028-037>039-048>050-241500-
Black Hawk IA-Bremer IA-Tama IA-Story IA-Grundy IA-Hardin IA-
Marshall IA-Franklin IA-Butler IA-
933 AM CDT Sat Jun 24 2023

...Strong thunderstorms will impact portions of northeastern Story,
northern Marshall, eastern Hardin, Black Hawk, northern Tama, Bremer,
eastern Franklin, Grundy and Butler Counties through 1000 AM CDT...

At 932 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 5 miles northeast of Hampton to 11 miles
southwest of Eldora. Movement was east at 40 mph.

HAZARD...Wind gusts up to 50 mph and pea 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.

Strong thunderstorms will be near...
  Eldora around 945 AM CDT.

Other locations in the path of these storms include Allison, Conrad,
Grundy Center, Clarksville and Greene.

This includes Interstate 380 between mile markers 56 and 73.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4230 9230 4223 9230 4213 9331 4289 9313
      4291 9299 4291 9208 4247 9208 4247 9206
      4230 9207
TIME...MOT...LOC 1432Z 248DEG 36KT 4277 9310 4222 9323

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Martin

Local storm report, Jun 24, 11:00 AM CDT, 3 hours 12 minutes before

Preliminary Local Storm Report
National Weather Service Des Moines IA
1100 AM CDT Sat Jun 24 2023

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

0906 AM     Tstm Wnd Dmg     1 NE Ames               42.03N 93.61W
06/24/2023                   Story              IA   Broadcast Media

            Tree branch fell on car parked in street.
            Report relayed by WHO media via social
            media. Time estimated by radar.

&&

rev

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 6:06 AM CDT	Special Weather Statement	DMX	Emmet, Palo Alto	24 min
Jun 24, 6:35 AM CDT	Special Weather Statement	DMX	Crawford, Sac	40 min
Jun 24, 9:33 AM CDT	Special Weather Statement	DMX	Black Hawk, Bremer, Butler, Grundy, Hardin	27 min
Jun 24, 1:15 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene, Hamilton, Story, Webster	45 min
Jun 24, 2:26 PM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	34 min
Jun 24, 2:58 PM CDT	Severe Thunderstorm Warning	DMX	Marion	32 min
Jun 24, 3:46 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin	44 min
Jun 24, 4:16 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Monroe	29 min
Jun 24, 4:21 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy	39 min
Jun 24, 4:55 PM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	35 min
Jun 24, 4:58 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	37 min
Jun 24, 5:21 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	39 min
Jun 24, 5:26 PM CDT	Severe Thunderstorm Warning	DMX	Wapello	25 min
Jun 24, 5:31 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Davis, Wapello	29 min
Jun 24, 5:44 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	46 min
Jun 24, 5:50 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Davis, Wapello	25 min
Jun 24, 6:46 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison, Union	23 min
Jun 24, 6:56 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Tama	20 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2023 Every 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.