Alert archive / Nebraska / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 99, NWS Omaha, NE

May 19, 2024Cass County, Nemaha County, Otoe County, Nebraska; Fremont County, Mills County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 19, 2024, 6:17 PM CDT for Cass County, Nemaha County, Otoe County, Nebraska; Fremont County, Mills County, Iowa. It was in force for 43 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
May 19, 2024, 6:17 PM CDT (23:17 UTC)
Expired
May 19, 2024, 7:00 PM CDT
In force
43 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Fremont County, IA, Mills County, IA, Cass County, NE, Nemaha County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 76 km from the middle of the area, began a volume at 23:20 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 400 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 12:00Z on 2024-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2024-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1304 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
57 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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 19, 3:23 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, May 19, 3:23 PM CDT, 2 hours 54 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, May 19, 3:46 PM CDT, 2 hours 31 minutes before
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
346 PM CDT Sun May 19 2024

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-201100-
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-
346 PM CDT Sun May 19 2024

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

.DAY ONE...Tonight and Monday

This evening, isolated strong to severe thunderstorms may develop
across southeast Nebraska with a threat for large hail and
damaging winds, particularly after 5 PM. For severe storms that
persist after dark, there will be a threat for spin-up tornadoes.
The threat will be focused south of I-80 in southeast Nebraska
with straight line winds the most likely hazard.

.DAYS TWO THROUGH SEVEN...Monday night through Sunday

Several rounds of strong to severe thunderstorms will be possible
through Tuesday afternoon. The greatest threat at this time
appears to be large hail, some of which could be greater than 2
inches in diameter. Severe wind gusts, tornadoes and flash
flooding will all be possible as well. We'll have additional
chances for thunderstorms beginning Thursday afternoon and heading
into next weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through Saturday.

In the hours before

Local storm report, May 19, 5:42 PM CDT, 35 minutes before
Preliminary Local Storm Report
National Weather Service Omaha/Valley NE
542 PM CDT Sun May 19 2024

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

0537 PM     Tstm Wnd Gst     Martell                 40.64N 96.75W
05/19/2024  M64 MPH          Lancaster          NE   Public

&&

CA

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 5:24 AM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saunders, Seward18 min
May 19, 5:55 AM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Lancaster, Saline9 min
May 19, 6:07 AM CDTSevere Thunderstorm WarningOAXLancaster, Saunders, Seward23 min
May 19, 6:26 AM CDTSevere Thunderstorm WarningOAXCass, Lancaster34 min
May 19, 6:54 AM CDTSevere Thunderstorm WarningOAXCass36 min
May 19, 7:29 AM CDTSevere Thunderstorm WarningOAXCass7 min
May 19, 5:24 PM CDTSevere Thunderstorm WarningOAXGage, Lancaster, Saline, Seward51 min
May 19, 5:46 PM CDTSevere Thunderstorm Warning Considerable damage threatOAXGage, Johnson, Lancaster, Otoe44 min
May 19, 6:55 PM CDTSevere Thunderstorm WarningOAXFremont, Mills, Montgomery, Page, Pottawattamie50 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2024Severe Thunderstorm Warnings in Iowa, 2024Every severe thunderstorm warning in 2024

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.