Alert archive / Nebraska / Special Weather Statements in 2018

Special Weather Statement, NWS Omaha, NE

August 2, 2018Washington County, Nebraska

NWS Omaha, NE issued this special weather statement at Aug 2, 2018, 4:50 AM CDT for Washington County, Nebraska. It was in force for 25 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 2, 2018, 4:50 AM CDT (09:50 UTC)
Expired: Aug 2, 2018, 5:15 AM CDT
In force: 25 min
Issued by: NWS Omaha, NE

County Washington County, NE

The radar

The Omaha radar (KOAX), 30 km from the middle of the area, began a volume at 09:51 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, 9.8 hours before the alert went out and 30 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: 1818 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1680 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 Omaha, NE wrote its last area forecast discussion before this special weather statement went out at Aug 2, 3:00 AM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Aug 2, 3:00 AM CDT, 1 hour 50 minutes before

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<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.
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Hazardous weather outlook, Aug 2, 3:58 AM CDT, 52 minutes before

Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
358 AM CDT Thu Aug 2 2018

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-022300-
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-
358 AM CDT Thu Aug 2 2018

This Hazardous Weather Outlook is for portions of southwest
Iowa...west central Iowa...east central Nebraska...northeast
Nebraska and southeast Nebraska.

.DAY ONE...Today and Tonight

Isolated thunderstorms are possible through mid morning from
parts of northeast into east central Nebraska and west central
Iowa.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Periods of thunderstorms are forecast from Friday night through
Wednesday, with the best chances favoring the evening and
overnight periods.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

Fobert

In the hours before

Special weather statement, Aug 2, 4:50 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Omaha/Valley Nebraska
450 AM CDT THU AUG 2 2018

NEZ033-034-044-045-021015-
Burt NE-Washington NE-Cuming NE-Dodge NE-
450 AM CDT THU AUG 2 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BURT...SOUTHEASTERN
CUMING...WASHINGTON AND NORTHEASTERN DODGE COUNTIES UNTIL 515 AM
CDT...

At 449 AM CDT, Doppler radar was tracking isolated strong
thunderstorms from near Scribner to near Hooper, or 38 miles
northwest of Omaha, moving southeast at 40 mph.

Hail up to dime size and winds in excess of 30 mph will be possible
with some of these storms.

Locations impacted include...
Blair, West Point, Arlington, Fort Calhoun, Scribner, Hooper, Dodge,
Nickerson, Kennard, Snyder, Uehling, Winslow and Dead Timber State
Recreation Area.

LAT...LON 4146 9594 4140 9626 4175 9692 4194 9673
      4155 9609 4153 9608 4151 9605 4152 9603
      4150 9601 4148 9602 4147 9600
TIME...MOT...LOC 0949Z 301DEG 33KT 4166 9653

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 5:01 AM CDT	Special Weather Statement	OAX	Washington	29 min
Aug 2, 6:13 AM CDT	Special Weather Statement	OAX	Cedar, Cuming, Thurston, Wayne	32 min
Aug 2, 6:45 AM CDT	Special Weather Statement	OAX	Cedar	30 min

Nearby

Special Weather Statements in Nebraska, 2018 Every special weather statement in 2018

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.