Alert archive / South Dakota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 97, NWS Aberdeen, SD

July 22, 1999Hughes County, Stanley County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 22, 1999, 4:59 PM CDT for Hughes County, Stanley County, South Dakota. It was in force for 46 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: Jul 22, 1999, 4:59 PM CDT (21:59 UTC)
Expired: Jul 22, 1999, 5:45 PM CDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

Counties Hughes County, SD, Stanley County, SD

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.0 hours before the alert went out and 165 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: 1958 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 1086 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 22, 3:19 PM CDT, 1 hour 40 minutes earlier.

Area forecast discussion, Jul 22, 3:19 PM CDT, 1 hour 40 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTHCENTRAL AND NORTHEAST
SOUTH DAKOTA AND WEST CENTRAL MINNESOTA
NATIONAL WEATHER SERVICE ABERDEEN SD
315 PM CDT THU JULY 22 1999

TSRAS ALREADY BREAKING THROUGH THE CAP ALONG SFC TROUGH EXTENDING
ACROSS C AND NC SD LATE THIS AFTERNOON. SATELLITE DERIVED PRODUCTS
SHOWED A VERY UNSTABLE AIRMASS ACROSS MOST OF THE ABR CWA WITH LIS DOWN
TO -12 AND CAPES OF 4-6 THOUSAND. HIGH DWPTS IN THE MID TO UPPER 70S
AND TEMPS IN THE 90S TO OVER 100 WERE WEAKENING THE CAP. SATELLITE
PRODUCTS CINH SHOWED THE CAP WEAKENING THE FASTEST IN C SD WHERE TSRAS
ARE PRESENTLY DEVELOPING. ALSO...A GOOD THETA-E RIDGE IS IN PLACE OVER
NE SD AND WC MN. THEREFORE...AS TROUGH MOVES THROUGH TONIGHT...THERE
WILL BE A CHANCE OF TSRAS OVER ALL OF THE AREA. FRIDAY SHOULD AGAIN BE
A HOT DAY WITH LESS HUMIDITY AS DWPTS FALL INTO THE 60S. FOR FRIDAY
NIGHT AND SATURDAY...MDLS SHOW UPPER RIDGE HOLDING IN STRONG WITH UPPER
DISTURBANCES ROLING OVER IT. DUE TO THE TIMING AND STRENGTH OF THESE
WAVES...WILL LEAVE OUT POPS FOR THE CWA FOR FRIDAY NIGHT AND SATURDAY.
FOR SUNDAY THROUGH TUESDAY...THE WEATHER PATTERN CHANGES VERY
LITTLE...EXCEPT FOR ON MONDAY ACROSS NE SD AND WC MN WHERE THE AVN SHOWS
A S/W MOVING OVER THE AREA...SO WILL PUT IN A CHANCE OF TSRAS HERE. DID
NOT STRAY MUCH FROM GUIDANCE TEMPS.

.ABR...NONE.

MOHR

In the hours before

Special weather statement, Jul 22, 11:20 AM CDT, 5 hours 39 minutes before

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Special weather statement, Jul 22, 11:20 AM CDT, 5 hours 39 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 Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 22, 3:59 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	46 min
Jul 22, 5:17 PM CDT	Severe Thunderstorm Warning	ABR	Sully	48 min
Jul 22, 5:29 PM CDT	Tornado Warning	ABR	Potter, Sully	36 min
Jul 22, 6:01 PM CDT	Flash Flood Warning	ABR	Sully	2 hr
Jul 22, 6:18 PM CDT	Tornado Warning	ABR	McPherson	32 min
Jul 22, 6:38 PM CDT	Tornado Warning	ABR	McPherson	32 min
Jul 22, 6:50 PM CDT	Tornado Warning	ABR	Edmunds	35 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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; the sounding from the Mesonet's radiosonde archive.