Alert archive / Nebraska / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 66, NWS Omaha, NE

June 1, 2014Knox County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jun 1, 2014, 1:29 PM CDT for Knox County, Nebraska. It was in force for 46 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 1, 2014, 1:29 PM CDT (18:29 UTC)
Expired: Jun 1, 2014, 2:15 PM CDT
In force: 46 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Knox County, NE

The radar

The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 18:29 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 1, 1:28 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 6.5 hours before the alert went out and 193 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: 833 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 989 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 1, 1:09 PM CDT, 20 minutes earlier.

Area forecast discussion, Jun 1, 1:09 PM CDT, 20 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 1, 12:11 PM CDT, 1 hour 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1211 PM CDT SUN JUN 1 2014

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-020100-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-
STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER-
SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-
JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
1211 PM CDT SUN JUN 1 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SEVERE THUNDERSTORMS ARE POSSIBLE LATER THIS AFTERNOON IN
NORTHEAST NEBRASKA...THEN ACROSS ALL OF EASTERN NEBRASKA AND
SOUTHWEST IOWA IN THE EARLY EVENING TO OVERNIGHT HOURS. DAMAGING
WINDS WILL BE THE PRIMARY SEVERE THREATS IN EASTERN
NEBRASKA AND SOUTHWEST IOWA. LARGE HAIL IS ALSO A THREAT ACROSS
EASTERN NEBRASKA DURING THE AFTERNOON AND EARLY EVENING. AN
ISOLATED TORNADO IS ALSO POSSIBLE IN THE AFTERNOON GENERALLY WEST
OF A COLUMBUS TO NORFOLK LINE.

AN UPPER LEVEL STORM SYSTEM AND ACCOMPANYING COLD FRONT WILL MOVE
THROUGH THE REGION THROUGH TONIGHT. HIGH INSTABILITY WILL DEVELOP
THIS AFTERNOON AHEAD OF THE COLD FRONT...ALONG WITH INCREASING
WIND SHEAR. THUNDERSTORMS ARE EXPECTED TO FIRE AHEAD OF THE COLD
FRONT IN CENTRAL NEBRASKA THIS AFTERNOON WHEN LARGE HAIL AND AN
ISOLATED TORNADO WILL BE POSSIBLE. THEN BY LATE AFTERNOON...STORMS
ARE EXPECTED TO FORM INTO A LINE AND MOVE EAST ACROSS THE
REMAINDER OF EASTERN NEBRASKA AND SOUTHWEST IOWA DURING THE
EVENING AND OVERNIGHT HOURS. DAMAGING WINDS WILL BE THE PRIMARY
THREAT DURING THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SEVERE STORMS WILL DEVELOP TUESDAY AFTERNOON INTO EARLY WEDNESDAY
AS VIGOROUS UPPER LEVEL WEATHER SYSTEM MOVES ACROSS THE REGION. A
WARM FRONT WILL DEVELOP ALONG THE KANSAS AND NEBRASKA BORDER
REGION AND BE THE PRIMARY AREA FOR SEVERE STORM DEVELOPMENT. VERY
LARGE HAIL...DAMAGING WINDS...ISOLATED TORNADOES AND VERY HEAVY
RAINFALL ARE EXPECTED. THE GREATEST RISK AREA FOR SEVERE WEATHER
TUESDAY NIGHT APPEARS TO BE ALONG AND SOUTH OF A LINE FROM ALBION
NEBRASKA TO HARLAN IOWA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND
EVENING.

SMITH

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 31, 7:37 PM CDT	Special Weather Statement	OAX	Cuming	38 min
Jun 1, 1:41 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Knox	49 min
Jun 1, 1:59 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	31 min
Jun 1, 2:38 PM CDT	Special Weather Statement	OAX	Wayne	37 min
Jun 1, 2:44 PM CDT	Special Weather Statement	OAX	Cuming, Thurston	31 min
Jun 1, 2:59 PM CDT	Special Weather Statement	OAX	Thurston	31 min
Jun 1, 3:03 PM CDT	Special Weather Statement	OAX	Cuming	27 min
Jun 1, 3:20 PM CDT	Special Weather Statement	OAX	Colfax, Cuming	25 min
Jun 1, 3:31 PM CDT	Special Weather Statement	OAX	Butler	29 min
Jun 1, 3:55 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Butler, Dodge, Douglas, Saunders, Washington	35 min
Jun 1, 4:24 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Saunders	36 min
Jun 1, 4:27 PM CDT	Special Weather Statement	OAX	Washington	33 min
Jun 1, 4:32 PM CDT	Severe Thunderstorm Warning	OAX	Washington	28 min
Jun 1, 4:53 PM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy, Washington	37 min
Jun 1, 5:11 PM CDT	Areal Flood Advisory	OAX	Douglas, Sarpy, Saunders	3 hr
Jun 1, 5:26 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy	49 min
Jun 1, 5:51 PM CDT	Special Weather Statement	OAX	Jefferson, Saline	39 min
Jun 1, 5:59 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	46 min
Jun 1, 6:16 PM CDT	Special Weather Statement	OAX	Mills, Montgomery	44 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2014 Every severe thunderstorm warning in 2014

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.