Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 445, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jun 30, 1998, 9:21 AM CDT for Grant County, Kay County, Oklahoma. It was in force for 24 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
- Jun 30, 1998, 9:21 AM CDT (14:21 UTC)
- Expired
- Jun 30, 1998, 9:45 AM CDT
- In force
- 24 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Grant County, OK, Kay County, OK
The radar
The Vance AFB radar (KVNX), 59 km from the middle of the area, began a volume at 14:24 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 |
|---|---|---|---|
| Jun 30, 9:35 AM CDT | Hail 0.75 | Renfrow, OK |
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
Lamont, OK (KLMN), launched 12:00Z, 2.4 hours before the alert went out and 21 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.
- Mixed-layer CAPE
- 1158 J/kg
- Mixed-layer CIN
- -316 J/kg
- Mixed-layer LCL
- 1699 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -439 m²/s²
- 0-3 km storm-relative helicity
- -374 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 30, 4:00 AM CDT, 5 hours 21 minutes earlier.
Area forecast discussion, Jun 30, 4:00 AM CDT, 5 hours 21 minutes before
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Special weather statement, Jun 30, 6:30 AM CDT, 2 hours 51 minutes before
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</html>Special weather statement, Jun 30, 6:30 AM CDT, 2 hours 51 minutes before
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<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>
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 9:50 AM CDT | Severe Thunderstorm Warning | OUN | Kay | 40 min |
| Jun 30, 1:12 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 48 min |
| Jun 30, 2:32 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 43 min |
| Jun 30, 3:26 PM CDT | Severe Thunderstorm Warning | OUN | Blaine | 49 min |
| Jun 30, 3:50 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Dewey | 40 min |
| Jun 30, 4:15 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer, Dewey | 45 min |
| Jun 30, 4:15 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher | 45 min |
| Jun 30, 4:41 PM CDT | Severe Thunderstorm Warning | OUN | Custer | 49 min |
| Jun 30, 4:59 PM CDT | Severe Thunderstorm Warning | OUN | Blaine | 31 min |
| Jun 30, 5:46 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 44 min |
| Jun 30, 5:55 PM CDT | Severe Thunderstorm Warning | OUN | Custer | 50 min |
| Jun 30, 6:21 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 54 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1998Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.