Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 170, NWS Omaha, NE

August 2, 2015Boone County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Aug 2, 2015, 7:58 PM CDT for Boone County, Nebraska. It was in force for 21 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: Aug 2, 2015, 7:58 PM CDT (00:58 UTC)
Expired: Aug 2, 2015, 8:19 PM CDT
In force: 21 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Boone County, NE

The radar

The Omaha radar (KOAX), 148 km from the middle of the area, began a volume at 00:59 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, 1.0 hours before the alert went out and 148 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: 3912 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1375 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 10.0

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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 2, 6:17 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, Aug 2, 6:17 PM CDT, 1 hour 41 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, Aug 2, 6:31 PM CDT, 1 hour 27 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>

In the hours before

Special weather statement, Aug 2, 6:25 PM CDT, 1 hour 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
625 PM CDT SUN AUG 2 2015

IAZ069-079-090-030015-
FREMONT IA-MILLS IA-POTTAWATTAMIE IA-
625 PM CDT SUN AUG 2 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN POTTAWATTAMIE...CENTRAL
MILLS AND NORTHWESTERN FREMONT COUNTIES UNTIL 715 PM CDT...

AT 625 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
GLENWOOD...OR 19 MILES SOUTHEAST OF OMAHA...MOVING SOUTHEAST AT 10
MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GLENWOOD...MALVERN...TABOR...SILVER CITY AND HASTINGS.

THIS INCLUDES HIGHWAY 34 IN IOWA BETWEEN MILE MARKERS 9 AND 20.

LAT...LON 4115 9580 4116 9557 4091 9539 4090 9570
TIME...MOT...LOC 2325Z 321DEG 8KT 4112 9570

ZAPOTOCNY

Local storm report, Aug 2, 6:36 PM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
636 PM CDT SUN AUG 02 2015

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

0634 PM     HAIL             GLENWOOD                41.05N 95.74W
08/02/2015  E1.25 INCH       MILLS              IA   PUBLIC

&&

MILLER

Local storm report, Aug 2, 6:44 PM CDT, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
644 PM CDT SUN AUG 02 2015

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

0615 PM     HAIL             1 NW GRANT              41.15N 95.00W
08/02/2015  E1.00 INCH       MONTGOMERY         IA   PUBLIC

0615 PM     HAIL             1 W GRANT               41.14N 95.00W
08/02/2015  E1.00 INCH       MONTGOMERY         IA   PUBLIC

&&

LANDSVORK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 7:35 PM CDT	Special Weather Statement	OAX	Saunders	25 min
Aug 2, 7:43 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	34 min
Aug 2, 7:54 PM CDT	Special Weather Statement	OAX	Boone	51 min
Aug 2, 8:26 PM CDT	Special Weather Statement	OAX	Platte	49 min
Aug 2, 8:33 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	27 min
Aug 3, 11:07 AM CDT	Special Weather Statement	OAX	Richardson	38 min
Aug 3, 11:20 AM CDT	Severe Thunderstorm Warning	OAX	Richardson	25 min
Aug 2, 7:30 PM CDT	Special Weather Statement	OAX	Mills	60 min
Aug 2, 10:08 PM CDT	Special Weather Statement	OAX	Montgomery	37 min
Aug 2, 10:53 PM CDT	Special Weather Statement	OAX	Page	52 min
Aug 2, 10:59 PM CDT	Severe Thunderstorm Warning	OAX	Page	46 min
Aug 2, 11:40 PM CDT	Severe Thunderstorm Warning	OAX	Page	35 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015 Every severe thunderstorm warning in 2015

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.