Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Des Moines, IA

August 1, 2017Emmet County, Iowa

NWS Des Moines, IA issued this special weather statement at Aug 1, 2017, 6:22 PM CDT for Emmet County, Iowa. It was in force for 38 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: Aug 1, 2017, 6:22 PM CDT (23:22 UTC)
Expired: Aug 1, 2017, 7:00 PM CDT
In force: 38 min
Issued by: NWS Des Moines, IA

County Emmet County, IA

The radar

The Sioux Falls radar (KFSD), 159 km from the middle of the area, began a volume at 23:23 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, 11.4 hours before the alert went out and 204 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: 13 J/kg
Mixed-layer CIN: -271 J/kg
Mixed-layer LCL: 1331 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Aug 1, 4:04 PM CDT, 2 hours 18 minutes earlier.

Area forecast discussion, Aug 1, 4:04 PM CDT, 2 hours 18 minutes before

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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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.
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        Please try again in a few minutes.
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Hazardous weather outlook, Aug 1, 5:23 AM CDT, 12 hours 59 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
523 AM CDT Tue Aug 1 2017

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-021030-
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-
523 AM CDT Tue Aug 1 2017

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Isolated non-severe thunderstorms are possible north and central this
afternoon and evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Isolated non-severe thunderstorms are possible Wednesday
afternoon over the far south. Scattered to widespread
thunderstorms are expected late Wednesday night into Thursday.
There is a very low threat of severe weather with these storms.
Additional thunderstorms are possible Saturday. The threat of
severe storms remains low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

REV

In the hours before

Special weather statement, Aug 1, 6:20 PM CDT, 2 minutes before

Special Weather Statement
National Weather Service Des Moines IA
620 PM CDT TUE AUG 1 2017

IAZ004-020000-
Emmet IA-
620 PM CDT TUE AUG 1 2017

...DIME TO NICKEL SIZE HAIL ALONG WITH GUSTS OF 40 TO 50 MPH
POSSIBLE...

At 619 PM CDT, Doppler radar was tracking a strong thunderstorm near
Estherville, moving southeast at 15 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Estherville, Ingham Lake, High Lake, Swan Lake, Ringsted, Gruver,
Wolden County Park and Estherville Municipal Airport.

LAT...LON 4350 9466 4326 9447 4326 9475 4348 9485
      4350 9477
TIME...MOT...LOC 2319Z 328DEG 13KT 4346 9476

Kotenberg

Special weather statement, Aug 1, 6:22 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Des Moines IA
622 PM CDT TUE AUG 1 2017

IAZ004-015-020000-
Palo Alto IA-Emmet IA-
622 PM CDT TUE AUG 1 2017

...DIME TO NICKEL SIZE HAIL POSSIBLE ALONG WITH WIND GUSTS OF
40 TO 50 MPH...

At 621 PM CDT, Doppler radar was tracking a strong thunderstorm near
Terril, or 7 miles southwest of Estherville, moving southeast at 15
mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Lost Island Lake, Graettinger, Ruthven and Lost Island Lake State
Park.

LAT...LON 4321 9472 4312 9491 4340 9491
TIME...MOT...LOC 2321Z 328DEG 13KT 4335 9496

Kotenberg

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 6:20 PM CDT	Special Weather Statement	DMX	Emmet	40 min
Aug 1, 6:36 PM CDT	Special Weather Statement	DMX	Kossuth	39 min
Aug 1, 6:47 PM CDT	Special Weather Statement	DMX	Palo Alto	28 min

Nearby

Special Weather Statements in Iowa, 2017 Every special weather statement in 2017

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.