Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 409, NWS Norman, OK

June 20, 1998Blaine County, Canadian County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 20, 1998, 5:59 PM CDT for Blaine County, Canadian County, Oklahoma. 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: Jun 20, 1998, 5:59 PM CDT (22:59 UTC)
Expired: Jun 20, 1998, 6:45 PM CDT
In force: 46 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Blaine County, OK, Canadian County, OK

The radar

The Norman radar (KTLX), 94 km from the middle of the area, began a volume at 23:01 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 20, 5:30 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.0 hours before the alert went out and 91 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: 2460 J/kg
Mixed-layer CIN: -329 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 335 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 3:30 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, Jun 20, 3:30 PM CDT, 2 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
330 PM CDT SAT JUN 20 1998

COLD FRONT OVR NWRN OK EXPECTED TO MOVE LITTLE THROUGH SUNDAY
MORNING THEN RETURN NORTH AS A WARM FRONT RAPIDLY SUNDAY. STRONG CAP
OVER WRN ZONES IS INHIBITING TSTMS ALONG THE DRYLINE.  HOWEVER
DRYLINE SHOULD CONTINUE TO PUSH SLOWLY EAST THIS EVENING AND IS
EXPECTED TO TRIGGER ISOLATED THUNDER SOMEWHERE IN WCNTRL/SWRN ZONES
WHERE CIN IS LOWEST.

STRENGTHENING CAP/RIDGE WILL EVENTUALLY PUT AN END TO THE POPS BUT
WILL ALSO KEEP THINGS HOT.  WILL ISSUE HEAT ADVISORY THROUGH SUNDAY
FOR MOST OF FA WITH MINS NEAR 80 AND MAXES NEAR 100/ HEAT INDEX OVER
105.

FCSTID = 10
OKC   79  99  78 100 /  20  20  20  10
HBR   78 107  80 107 /  20  20  20  10
SPS   78 109  79 108 /  20  20  20  10
GAG   65 104  70 105 /   0   0   0  20
PNC   81 101  81 101 /  20  20  10  20
DUA   80 101  80 101 /  20  20  20  10

.OUN...
OK...NONE.
TX...NONE.

~

In the hours before

Special weather statement, Jun 20, 12:30 PM CDT, 5 hours 29 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>

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	48 min
Jun 19, 7:27 PM CDT	Tornado Warning	OUN	Garfield	33 min
Jun 19, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	46 min
Jun 19, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	44 min
Jun 19, 7:51 PM CDT	Flash Flood Warning	OUN	Garfield	114 min
Jun 19, 7:57 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	48 min
Jun 19, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	41 min
Jun 19, 8:15 PM CDT	Tornado Warning	OUN	Caddo	30 min
Jun 19, 8:24 PM CDT	Tornado Warning	OUN	Garfield	36 min
Jun 19, 8:45 PM CDT	Tornado Warning	OUN	Caddo, Grady	30 min
Jun 19, 8:48 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian	42 min
Jun 19, 8:53 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	37 min
Jun 19, 9:30 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian	45 min
Jun 19, 10:06 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	39 min
Jun 20, 5:15 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	45 min
Jun 20, 5:35 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	40 min
Jun 20, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	42 min
Jun 20, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	46 min
Jun 20, 6:17 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	43 min
Jun 20, 6:37 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	53 min
Jun 20, 6:44 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	46 min
Jun 20, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	51 min
Jun 20, 6:58 PM CDT	Tornado Warning	OUN	Kingfisher	32 min
Jun 20, 6:59 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	46 min
Jun 19, 7:24 PM CDT	Flash Flood Warning	OUN	Baylor	3 hr
Jun 19, 7:40 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	60 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every severe thunderstorm warning in 1998

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.