Alert archive / Nebraska / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 50, NWS North Platte, NE

May 22, 1999Loup County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 22, 1999, 3:52 PM CDT for Loup County, Nebraska. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 22, 1999, 3:52 PM CDT (20:52 UTC)
Expired
May 22, 1999, 4:55 PM CDT
In force
63 min
Issued by
NWS North Platte, NE
Area
Whole counties

County Loup County, NE

The radar

The North Platte radar (KLNX), 93 km from the middle of the area, began a volume at 20:56 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.

What was reported inside it

TimeReportWhereRemark
May 22, 4:10 PM CDTHail 0.75Almeria, NE

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 22, 2:00 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.9 hours before the alert went out and 129 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 1999-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 333 joules per kilogram.LCLLFCEL10008507005003002001001 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 1999-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 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
333 J/kg
Mixed-layer CIN
-244 J/kg
Mixed-layer LCL
1297 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 22, 3:43 PM CDT, 9 minutes earlier.

Area forecast discussion, May 22, 3:43 PM CDT, 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
343 PM CDT SAT MAY 22 1999

...VOLATILE WEATHER EVENT UNDERWAY...

MESOETA INDICATES RICH THETA-E AIR WILL DROP SWD WITH THE COLD FRONT
ACROSS NORTH CNTL AND NW NEB BY 06Z.  THEREAFTER GRADUAL CLEARING
SHOULD BE UNDERWAY WITH NORTH WINDS... SUBSIDENCE AND DRYING.  SUNDAY
LOOKS SUNNY AND DRIER WITH RIDGE CONTINUE TO BUILD IN ACROSS ERN
2/3 OF FCST AREA.  STILL SOME RESIDUAL CLOUDINESS AND MOISTURE ACROSS
THE EASTERN PANHANDLE AT 700 MB.  ALSO...WEAK UP SLOPE FLOW WILL
CONTINUE TO PRODUCE SHRAS THROUGH 15Z AND MOSTLY CLOUDY SKIES INTO
THE EARLY AFTERNOON.

ALL MODELS ADVERTISE CLEAR SKIES FOR SUNDAY NIGHT WITH THE MIDLEVEL
RIDGE WHICH SHOULD LAST INTO MONDAY.  BY MONDAY NIGHT THE UPPER LOW
ACROSS SWRN U.S. SHOULD BEGIN TO LIFT OUT WITH WEAK RETURN ACROSS
WRN HIGH PLAINS.  ATTM TUES EXTENDED FCST SHOULD HOLD.

.LBF...NEZ022-056 TORNADO WATCH UNTIL 9 PM MDT
       NEZ008>010-015-026>029-103-113-171 SEVERE THUNDERSTORM WATCH
       UNTIL 10 PM CDT.

COLE

In the hours before

Special weather statement, May 22, 11:24 AM CDT, 4 hours 28 minutes before
NEZ004>010-022>029-035>038-056>059-069>071-222200-

SEVERE WEATHER OUTLOOK FOR WESTERN AND NORTH CENTRAL NEBRASKA
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1124 AM CDT SAT MAY 22 1999

...STORM SPOTTERS IN SOUTHWEST AND NORTH CENTRAL NEBRASKA SHOULD BE
ALERT FOR POSSIBLE ACTIVATION THIS AFTERNOON INTO THE EVENING...

THERE IS A CHANCE FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING
OVER PORTIONS OF SOUTHWEST AND NORTH CENTAL NEBRASKA. THE GREATEST RISK
OF SEVERE WEATHER WILL BE SOUTHEAST OF A FROM VALENTINE TO ALLIANCE.
STRONG THUNDERSTORMS ARE ALSO POSSIBLE IN SHERIDAN COUNTY AND NORTHWEST
CHERRY COUNTY IN THE AFTERNOON...BUT STORMS WILL NOT LIKELY REACH
SEVERE LEVELS UNTIL THEY MOVE SOUTHEAST THIS AREA.

A COLD FRONT WILL MOVE SOUTHEAST THROUGH WESTERN AND NORTH CENTRAL
NEBRASKA THIS AFTERNOON AND EARLY EVENING. THUNDERSTORMS ARE EXPECTED
TO DEVELOP ALONG THE FRONT EARLY IN THE AFTERNOON IN NORTH CENTRAL
NEBRASKA. THE STORMS MAY BECOME SEVERE AS THEY MOVE INTO AN AREA OF
INCREASING INSTABILITY AIDED BY MORNING SUNSHINE AND ABUNDANT LOW LEVEL
MOISTURE.

THUNDERSTORMS WILL CONTINUE THROUGH LATE AFTERNOON AND EARLY EVENING
ALONG AND BEHIND THE COLD FRONT. THE THREAT FOR SEVERE STORMS WILL
DIMINISH IN THE EVENING FROM NORTHWEST TO SOUTHEAST ACROSS WESTERN
NEBRASKA AS DRIER AND MORE STABLE AIR MOVES INTO THE AREA.

SHEETS
Special weather statement, May 22, 11:24 AM CDT, 4 hours 28 minutes before
NEZ004>010-022>029-035>038-056>059-069>071-222200-

SEVERE WEATHER OUTLOOK FOR WESTERN AND NORTH CENTRAL NEBRASKA
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1124 AM CDT SAT MAY 22 1999

...STORM SPOTTERS IN SOUTHWEST AND NORTH CENTRAL NEBRASKA SHOULD BE
ALERT FOR POSSIBLE ACTIVATION THIS AFTERNOON INTO THE EVENING...

THERE IS A CHANCE FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING
OVER PORTIONS OF SOUTHWEST AND NORTH CENTAL NEBRASKA. THE GREATEST RISK
OF SEVERE WEATHER WILL BE SOUTHEAST OF A FROM VALENTINE TO ALLIANCE.
STRONG THUNDERSTORMS ARE ALSO POSSIBLE IN SHERIDAN COUNTY AND NORTHWEST
CHERRY COUNTY IN THE AFTERNOON...BUT STORMS WILL NOT LIKELY REACH
SEVERE LEVELS UNTIL THEY MOVE SOUTHEAST THIS AREA.

A COLD FRONT WILL MOVE SOUTHEAST THROUGH WESTERN AND NORTH CENTRAL
NEBRASKA THIS AFTERNOON AND EARLY EVENING. THUNDERSTORMS ARE EXPECTED
TO DEVELOP ALONG THE FRONT EARLY IN THE AFTERNOON IN NORTH CENTRAL
NEBRASKA. THE STORMS MAY BECOME SEVERE AS THEY MOVE INTO AN AREA OF
INCREASING INSTABILITY AIDED BY MORNING SUNSHINE AND ABUNDANT LOW LEVEL
MOISTURE.

THUNDERSTORMS WILL CONTINUE THROUGH LATE AFTERNOON AND EARLY EVENING
ALONG AND BEHIND THE COLD FRONT. THE THREAT FOR SEVERE STORMS WILL
DIMINISH IN THE EVENING FROM NORTHWEST TO SOUTHEAST ACROSS WESTERN
NEBRASKA AS DRIER AND MORE STABLE AIR MOVES INTO THE AREA.

SHEETS
Local storm report, May 22, 3:40 PM CDT, 12 minutes before
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Local storm report, May 22, 3:40 PM CDT, 12 minutes before
<!doctype html>
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    <section class="card" role="status" aria-live="polite">
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Local storm report, May 22, 3:43 PM CDT, 9 minutes before
<!doctype html>
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<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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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
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Local storm report, May 22, 3:43 PM CDT, 9 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>
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The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 8:04 PM CDTSevere Thunderstorm WarningLBFGarden46 min
May 21, 8:29 PM CDTSevere Thunderstorm WarningLBFDeuel46 min
May 22, 1:22 PM CDTSevere Thunderstorm WarningLBFBlaine48 min
May 22, 1:39 PM CDTSevere Thunderstorm WarningLBFRock46 min
May 22, 1:44 PM CDTSevere Thunderstorm WarningLBFLoup61 min
May 22, 2:11 PM CDTSevere Thunderstorm WarningLBFCherry34 min
May 22, 2:18 PM CDTSevere Thunderstorm WarningLBFCuster32 min
May 22, 2:35 PM CDTSevere Thunderstorm WarningLBFBlaine, Brown45 min
May 22, 2:38 PM CDTSevere Thunderstorm WarningLBFGarfield62 min
May 22, 3:03 PM CDTSevere Thunderstorm WarningLBFWheeler62 min
May 22, 3:10 PM CDTSevere Thunderstorm WarningLBFLogan, Thomas50 min
May 22, 3:21 PM CDTSevere Thunderstorm WarningLBFBlaine, Brown59 min
May 22, 3:55 PM CDTSevere Thunderstorm WarningLBFCuster65 min
May 22, 5:01 PM CDTSevere Thunderstorm WarningLBFCuster44 min
May 22, 6:31 PM CDTSevere Thunderstorm WarningLBFFrontier49 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.