Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 170, NWS Norman, OK

May 6, 1998Lincoln County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 6, 1998, 7:27 PM CDT for Lincoln County, Oklahoma. It was in force for 33 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: May 6, 1998, 7:27 PM CDT (00:27 UTC)
Expired: May 6, 1998, 8:00 PM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Lincoln County, OK

The radar

The Norman radar (KTLX), 55 km from the middle of the area, began a volume at 00:28 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.5 hours before the alert went out and 71 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: 1000 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1337 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.4

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 May 6, 2:40 PM CDT, 4 hours 47 minutes earlier.

Area forecast discussion, May 6, 2:40 PM CDT, 4 hours 47 minutes before

FPUS3 KOKC 061953
AFDOKC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
240 PM CDT WED MAY 6 1998

STORMS WILL CONTINUE TO DEVELOP NEAR A STATIONARY SURFACE BOUNDARY
THAT EXTENDS FROM A LOW OVER EAST CENTRAL CO THROUGH SOUTHWEST AND
EXTREME SOUTH CENTRAL KS. ANOTHER SURFACE LOW TO THE SOUTHEAST OF
CDS CONTINUES TO PULL MORE MOISTURE INTO WESTERN AND CENTRAL OK THIS
AFTERNOON. STORMS ARE ALSO DEVELOPING SOUTH OF THE KS BOUNDARY
ACROSS MUCH OF NORTHERN OK. THIS IS THE BEGINNING OF AN EVENT THAT WILL
PROBABLY LAST MUCH OF THE NIGHT, SUSTAINED BY THE APPROACH OF A COLD
FRONT TO THE NORTH AND A MID-LEVEL WAVE TO THE WEST. THE FRONT, FROM
NEAR LIC TO VTN TO GFK IS MAKING STEADY PROGRESS SOUTHEAST THIS
AFTERNOON. IT SHOULD ENTER NW OK LATE THIS EVENING AND PUSH TO
SOUTHEAST OK BY THURSDAY AFTERNOON. WARMER AIR ALOFT WILL CONTINUE TO WORK
AGAINST THUNDERSTORM DEVELOPMENT IN SOUTH CENTRAL AND SOUTHEAST OK,
ALTHOUGH A FEW STORMS ARE EXPECTED IN THOSE AREAS TONIGHT. DIRER
SURFACE AIR AND WARMER TEMPERATURES ALOFT WILL KEEP FAR SOUTHWEST
ZONES DRY.

THE COLD FRONT WILL PASS THROUGH OK WITH THE ASSOCIATED MID-LEVEL
WAVE TONIGHT, WHICH WILL HELP SUSTAIN STORMS IN THE NORTHERN HALF
OF THE STATE. AFTER THIS WAVE AND FRONT EXIT, SLIGHTLY DRIER AIR
WILL FILTER INTO MUCH OF OK. THE NEXT SYSTEM IS SETTING UP TO BE
BIGGER AND WILL BEGIN TO INFLUENCE OUR WEATHER ON FRIDAY. A
DEVELOPING MID-LEVEL STORM, SEVERAL HUNDRED MILES WEST OF THE
SOUTHERN CA COAST THIS AFTERNOO, WILL APPROACH THE SOUTHERN PLAINS
THURSDAY NIGHT. A STRONG SURFACE LOW IS LIKELY TO DEVELOP NEAR THE
TX PANHANDLE IN THE OLD STATIONARY TROUGH AREA. STRONG SOUTH WINDS
ON FRIDAY AND MID-LEVEL WINDS WILL LIKELY BRING A STRONG DRY LINE
INTO WESTERN OK AND WESTERN NORTH TX ON FRIDAY.  THIS SYSTEM SHOULD
MOVE OUT ON SATURDAY LEAVING THE REST OF THE WEEKEND DRY.

WR

FCSTID = 9
OKC   59  78  58  79 /  40  30   0  20
HBR   56  81  56  84 /  20  20   0  30
SPS   58  83  57  84 /  20  20   0  20
GAG   51  74  50  79 /  40   0   0  30
PNC   58  72  56  78 /  70  40   0  20
DUA   62  82  59  81 /  30  30  10  20

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

In the hours before

Local storm report, May 6, 5:00 PM CDT, 2 hours 27 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
500 PM CDT WED MAY 6 1998

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

430 PM     FREEDOM                    OK   0.88 IN HAIL
05/06/98   WOODS

445 PM     6 S COVINGTON              OK   1.00 IN HAIL
05/06/98   GARFIELD

SC

Local storm report, May 6, 6:35 PM CDT, 52 minutes before

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Local storm report, May 6, 6:50 PM CDT, 37 minutes before

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Local storm report, May 6, 6:50 PM CDT, 37 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 Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 6, 9:27 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	48 min
May 6, 9:39 PM CDT	Severe Thunderstorm Warning	OUN	Payne	36 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.