Alert archive / Iowa / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 23, NWS Des Moines, IA

April 6, 2010Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 6, 2010, 1:03 AM CDT for Crawford County, Iowa. It was in force for 42 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: Apr 6, 2010, 1:03 AM CDT (06:03 UTC)
Expired: Apr 6, 2010, 1:45 AM CDT
In force: 42 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Crawford County, IA

The radar

The Omaha radar (KOAX), 114 km from the middle of the area, began a volume at 06:05 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

Omaha, NE (KOAX), launched 00:00Z, 6.1 hours before the alert went out and 114 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: 2 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 621 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 225 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 Apr 6, 12:27 AM CDT, 36 minutes earlier.

Area forecast discussion, Apr 6, 12:27 AM CDT, 36 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, Apr 5, 4:01 PM CDT, 9 hours 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
401 PM CDT MON APR 5 2010

IAZ024>028-034>039-045>050-057>062-062115-
HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-CALHOUN-WEBSTER-HAMILTON-
HARDIN-GRUNDY-BLACK HAWK-CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-
AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-POWESHIEK-
401 PM CDT MON APR 5 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THIS AFTERNOON AND EARLY THIS EVENING...ISOLATED TO SCATTERED SEVERE
THUNDERSTORMS WITH LARGE HAIL ARE POSSIBLE. AFTER 8 PM THIS
EVENING...SEVERE THUNDERSTORMS WITH LARGE HAIL...DAMAGING WINDS
AND HEAVY RAINFALL ARE LIKELY. ISOLATED TORNADOES ARE ALSO
POSSIBLE TONIGHT. IN ADDITION TO A FLASH FLOOD THREAT...HEAVY
RAINFALL COULD RETURN NUMEROUS RIVERS BACK ABOVE FLOOD STAGE OVER
THE NEXT SEVERAL DAYS.

A FLASH FLOOD WATCH IS IN EFFECT FOR THE AREA. PLEASE REFER TO
THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR
FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ADDITIONAL SEVERE THUNDERSTORMS ARE POSSIBLE TUESDAY. THE
POTENTIAL EXISTS FOR LARGE HAIL AND DAMAGING WINDS ALONG WITH
TORNADOES.

A FLASH FLOOD WATCH IS IN EFFECT FOR THE AREA. PLEASE REFER TO
THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR
FURTHER DETAILS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY TONIGHT AND TUESDAY AFTERNOON.

IAZ070>075-081>086-092>097-062115-
CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-
MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
401 PM CDT MON APR 5 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED SEVERE THUNDERSTORMS WITH LARGE HAIL ARE POSSIBLE
THROUGH THE REMAINDER OF THE AFTERNOON. AFTER 6 PM THIS EVENING...SEVERE
THUNDERSTORMS WITH LARGE HAIL...DAMAGING WINDS AND HEAVY RAINFALL
ARE LIKELY. A FEW TORNADOES WILL REMAIN POSSIBLE THROUGHOUT THE
OVERNIGHT HOURS. THERE IS THE POTENTIAL FOR A STRONG TORNADO OR
TWO TO OCCUR ESPECIALLY EARLY EVENING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ADDITIONAL SEVERE THUNDERSTORMS ARE POSSIBLE TUESDAY AFTERNOON. THE
POTENTIAL EXISTS FOR LARGE HAIL AND DAMAGING WINDS ALONG WITH
TORNADOES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY TONIGHT...AND TUESDAY AFTERNOON.

IAZ004>007-015>017-023-033-044-062115-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-SAC-CRAWFORD-
401 PM CDT MON APR 5 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED TO SCATTERED SEVERE THUNDERSTORMS WITH LARGE
HAIL ARE EXPECTED LATE THIS EVENING AND OVERNIGHT. HAIL UP TO THE
SIZE OF QUARTERS IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ADDITIONAL SEVERE THUNDERSTORMS ARE POSSIBLE. THE POTENTIAL EXISTS
FOR LARGE HAIL AND DAMAGING WINDS ALONG WITH TORNADOES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY TONIGHT...AND TUESDAY AFTERNOON.

DONAVON

In the hours before

Local storm report, Apr 5, 7:53 PM CDT, 5 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
753 PM CDT MON APR 05 2010

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

1237 PM     HAIL             5 WNW KNOXVILLE AIRPORT 41.33N 93.20W
04/05/2010  M1.00 INCH       MARION             IA   EMERGENCY MNGR

1242 PM     HAIL             KNOXVILLE               41.32N 93.10W
04/05/2010  E1.00 INCH       MARION             IA   TRAINED SPOTTER

0104 PM     HAIL             INDIANOLA               41.36N 93.57W
04/05/2010  M0.88 INCH       WARREN             IA   EMERGENCY MNGR

0113 PM     HAIL             DE SOTO                 41.53N 94.01W
04/05/2010  E0.88 INCH       DALLAS             IA   LAW ENFORCEMENT

0115 PM     HAIL             VAN METER               41.53N 93.96W
04/05/2010  E1.00 INCH       DALLAS             IA   TRAINED SPOTTER

            REPORTED AT VAN METER FIRE STATION

0115 PM     HAIL             1 SE JOHNSTON           41.68N 93.69W
04/05/2010  E0.88 INCH       POLK               IA   TRAINED SPOTTER

0121 PM     HAIL             CLIVE                   41.61N 93.77W
04/05/2010  E0.75 INCH       POLK               IA   TRAINED SPOTTER

0131 PM     HAIL             JOHNSTON                41.69N 93.70W
04/05/2010  M1.00 INCH       POLK               IA   TRAINED SPOTTER

            NICKEL TO QUARTER SIZED HAIL COVERING THE GROUND.

0135 PM     HAIL             WSW DELPHOS             40.66N 94.34W
04/05/2010  M1.00 INCH       RINGGOLD           IA   TRAINED SPOTTER

0208 PM     HAIL             1 N DIAGONAL            40.83N 94.34W
04/05/2010  E1.00 INCH       RINGGOLD           IA   TRAINED SPOTTER

0228 PM     HAIL             2 NNW ELLSTON           40.87N 94.13W
04/05/2010  M1.50 INCH       RINGGOLD           IA   TRAINED SPOTTER

0236 PM     HAIL             7 SSE THAYER            40.94N 94.00W
04/05/2010  E1.75 INCH       CLARKE             IA   LAW ENFORCEMENT

            SHERIFF DEPUTY IN SMALL TOWN OF HOPEVILLE.

0244 PM     HAIL             4 S MURRAY              40.98N 93.95W
04/05/2010  E1.75 INCH       CLARKE             IA   TRAINED SPOTTER

0245 PM     HAIL             MURRAY                  41.04N 93.95W
04/05/2010  E1.00 INCH       CLARKE             IA   TRAINED SPOTTER

            CORRECTED FOR TIME

0330 PM     HAIL             LACONA                  41.19N 93.38W
04/05/2010  E1.00 INCH       WARREN             IA   PUBLIC

            HAIL REPORTED AT THE LACONA POST OFFICE.

0337 PM     HAIL             4 W MELCHER-DALLAS      41.23N 93.32W
04/05/2010  E1.75 INCH       MARION             IA   TRAINED SPOTTER

            GROUND IS WHITE WITH HAIL.

0342 PM     HAIL             6 WSW KNOXVILLE AIRPORT 41.27N 93.22W
04/05/2010  M1.00 INCH       MARION             IA   STORM CHASER

0350 PM     HAIL             4 SW KNOXVILLE          41.28N 93.16W
04/05/2010  E1.00 INCH       MARION             IA   EMERGENCY MNGR

0352 PM     HAIL             KNOXVILLE               41.32N 93.10W
04/05/2010  E1.75 INCH       MARION             IA   EMERGENCY MNGR

0356 PM     HAIL             KNOXVILLE               41.32N 93.10W
04/05/2010  E1.75 INCH       MARION             IA   TRAINED SPOTTER

0400 PM     HAIL             3 NNE KNOXVILLE AIRPORT 41.35N 93.10W
04/05/2010  M1.50 INCH       MARION             IA   STORM CHASER

0400 PM     HAIL             2 NE KNOXVILLE          41.34N 93.07W
04/05/2010  E1.25 INCH       MARION             IA   TRAINED SPOTTER

0404 PM     HAIL             PELLA                   41.41N 92.92W
04/05/2010  E1.00 INCH       MARION             IA   TRAINED SPOTTER

0410 PM     HAIL             PELLA                   41.41N 92.92W
04/05/2010  E1.75 INCH       MARION             IA   TRAINED SPOTTER

0415 PM     HAIL             1 N PELLA AIRPORT       41.42N 92.95W
04/05/2010  E1.00 INCH       MARION             IA   TRAINED SPOTTER

0416 PM     HAIL             3 SE PELLA              41.38N 92.88W
04/05/2010  E1.75 INCH       MARION             IA   EMERGENCY MNGR

0449 PM     HAIL             DEEP RIVER              41.58N 92.37W
04/05/2010  M1.25 INCH       POWESHIEK          IA   TRAINED SPOTTER

            COVERING GROUND

0452 PM     HAIL             1 E DEEP RIVER          41.58N 92.35W
04/05/2010  E1.00 INCH       POWESHIEK          IA   TRAINED SPOTTER

&&

BMOYER

Special weather statement, Apr 5, 11:24 PM CDT, 1 hour 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1124 PM CDT MON APR 5 2010

IAZ070-071-060500-
ADAIR-CASS-
1124 PM CDT MON APR 5 2010

AT 1121 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER SOUTH CENTRAL CASS COUNTY...MOVING NORTHEAST
AT 55 MPH.

PENNY SIZE HAIL WILL BE POSSIBLE WITH THIS STORM.

* THE THUNDERSTORM WILL BE NEAR...
  STUART BY MIDNIGHT CDT...

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

MOYER

Local storm report, Apr 6, 12:26 AM CDT, 37 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>

Local storm report, Apr 6, 12:28 AM CDT, 35 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>

Local storm report, Apr 6, 12:32 AM CDT, 31 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>

Local storm report, Apr 6, 12:47 AM CDT, 16 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 11:39 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass, Guthrie	35 min
Apr 6, 12:06 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll	39 min
Apr 6, 12:09 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	36 min
Apr 6, 12:33 AM CDT	Severe Thunderstorm Warning	DMX	Guthrie	42 min
Apr 6, 1:25 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas	50 min
Apr 6, 5:12 AM CDT	Areal Flood Advisory	DMX	Black Hawk, Grundy	108 min
Apr 6, 4:35 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Grundy	40 min
Apr 6, 5:03 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Lucas, Mahaska, Marion, Warren	42 min
Apr 6, 5:11 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	34 min
Apr 6, 5:44 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Poweshiek, Tama	46 min
Apr 6, 5:57 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek, Tama	48 min
Apr 6, 6:01 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion	26 min
Apr 6, 6:06 PM CDT	Severe Thunderstorm Warning	DMX	Warren	39 min
Apr 6, 6:08 PM CDT	Tornado Warning	DMX	Poweshiek, Tama	37 min
Apr 6, 6:13 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Warren	32 min
Apr 6, 6:29 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion, Marshall, Polk, Poweshiek	46 min
Apr 6, 6:57 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek	48 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2010 Every severe thunderstorm warning in 2010

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.