Alert archive / Kansas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 103, NWS Topeka, KS

August 7, 1999Osage County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 7, 1999, 7:50 PM CDT for Osage County, Kansas. It was in force for 35 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: Aug 7, 1999, 7:50 PM CDT (00:50 UTC)
Expired: Aug 7, 1999, 8:25 PM CDT
In force: 35 min
Issued by: NWS Topeka, KS
Area: Whole counties

County Osage County, KS

The radar

The Topeka radar (KTWX), 58 km from the middle of the area, began a volume at 00:50 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

Time	Report	Where	Remark
Aug 7, 7:53 PM CDT	Thunderstorm Wind 52	Lyndon, KS

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 nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 0.8 hours before the alert went out and 39 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: 2574 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1630 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 9.1

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 Topeka, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 2:02 PM CDT, 5 hours 48 minutes earlier.

Area forecast discussion, Aug 7, 2:02 PM CDT, 5 hours 48 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE  TOPEKA KS
200 AM CDT SAT AUG 7 1999

...WILL RAIN OR NOT THIS EVENING IS THE MAIN QUESTION...

NONE OF THE MODELS ARE DOING A VERY GOOD JOB WITH THIS FAST MOVING
SYSTEM THAT IS PULLING MUCH OF THE ENERGY WELL AWAY FROM THE
FORECAST AREA...WHILE LEAVING A TRAILING FRONT.

WILL WATCH FRONTAL ZONE AS IT ENTERS NORTHEAST KANSAS FOR THE
POSSIBILITY OF THUNDERSTORMS...BUT MAIN INTENTION IS TO ONLY INCLUDE
A 30 PERCENT FOR THE EAST-CENTRAL ZONES THIS EVENING.

THETA-E AXIS SETS UP ACROSS SOUTHERN KANSAS/MISSOURI LATER
TONIGHT...WHERE THE SURFACE FRONT BEGINS TO STALL...AS SLIGHTLY
LOWER SURFACE DEWPOINT AIR SETTLES INTO NORTHERN KANSAS.

CLOUD COVER OVER THE NORTHERN PLAINS THIS AFTERNOON LOOKS LIKE A
WINTER PATTERN.  BELIEVE A LARGE PART OF THIS AREA WILL CLEAR AFTER
SUNSET AND NOT ADVECT INTO THE FORECAST AREA UNTIL LATE TONIGHT IN
THE NORTHEAST.  WITH SIGNIFICANT 925-750MB MOISTURE REMAINING IN
PLACE THROUGH SUNDAY...THIS WILL LIKELY CREATE SOME SC OVER THE
NORTHEAST AND EAST-CENTRAL COUNTIES DURING THE DAY.

NORTHEAST/EAST SURFACE FLOW ON SUNDAY WILL GIVE WAY TO A SOUTH WIND
IN THE NORTHCENTRAL COUNTIES SUNDAY NIGHT AND AREAWIDE MONDAY.

WILL GENERALLY USE FAN NUMBERS FOR PERIODS 1-3 WITH FWC ON MONDAY.

ROGERS

.TOP...NONE

In the hours before

Local storm report, Aug 7, 6:35 PM CDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TOPEKA KS
635 PM CDT SAT AUG 07 1999

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0625 PM    GLASCO                    KS    .75 INCH HAIL
08/07/99   CLOUD

Local storm report, Aug 7, 7:35 PM CDT, 15 minutes before

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Local storm report, Aug 7, 7:35 PM CDT, 15 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.
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The office that day

Everything else NWS Topeka, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 7:12 PM CDT	Severe Thunderstorm Warning	TOP	Franklin	33 min
Aug 7, 7:42 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Franklin	33 min

Nearby

Severe Thunderstorm Warnings in Kansas, 1999 Every 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.