Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 438, NWS Tulsa, OK

August 23, 1999LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 23, 1999, 5:35 PM CDT for LeFlore County, Oklahoma. It was in force for 40 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: Aug 23, 1999, 5:35 PM CDT (22:35 UTC)
Expired: Aug 23, 1999, 6:15 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 53 km from the middle of the area, began a volume at 22:36 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 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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 3:45 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Aug 23, 3:45 PM CDT, 1 hour 50 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
345 PM CDT MON AUG 23 1999

PROBLEMS OF THE DAY:
WILL THERE BE CONVECTION?
WILL THERE BE SEVERE CONVECTION?
TEMPERATURES

PLAYING A WAITING GAME NOW TO SEE IF CONVECTION FIRES NEAR THE
SURFACE LOW CENTERED OVER OSAGE COUNTY AT 20Z. WARM FRONT EXTENDS
FROM THE SURFACE LOW TO NEAR CLAREMORE THEN SOUTH TO MUSKOGEE THAN
SOUTHEAST TO NORTHERN LE FLORE COUNTY. KINX-88D HAS SHOWN THE
PROGRESS OF THE WARM FRONT QUITE NICELY THIS AFTERNOON. THIS
BOUNDARY WILL ALSO NEED TO BE WATCHED FOR POTENTIAL CONVECTIVE
DEVELOPMENT. SURFACE TROF TRAILING FROM THE LOW THROUGH SOUTHEAST
PAWNEE COUNTY INTO CENTRAL OKLAHOMA IS YET ANOTHER BOUNDARY TO
MONITOR.

THE MAIN LIMITING FACTORS FOR THUNDERSTORM DEVELOPMENT ARE THE
RELATIVE LACK OF MOISTURE AND RATHER LIMITED LOW LEVEL CONVERGENCE...
ESPECIALLY ALONG THE SURFACE TROF WHERE WINDS ARE VEERED OUT AHEAD
OF THE TROF. ALSO MID LEVEL WIND SPEEDS ARE VERY LIGHT ALTHOUGH
DIRECTIONAL SHEAR IS FAIRLY DECENT.

CONDITIONS APPEAR TO BECOME BETTER FOR CONVECTION BETWEEN 00Z AND
06Z TO THE SOUTH AND EAST OF INTERSTATE 44 AS LOW LEVEL WINDS BACK
A BIT AND MID LEVEL WINDS INCREASE SOMEWHAT. THUS ANY CONVECTION
WHICH DOES FORM MAY NOT DISSIPATE WITH THE LOSS OF HEATING BUT MAY
CONTINUE THROUGH MUCH OF THE NIGHT. COLD FRONT STILL WELL TO THE
NORTH AND WILL NOT BE A MAJOR FACTOR IN ANY CONVECTIVE ACTIVITY
TONIGHT. THIS FRONT SHOULD REACH NEAR A FORT SMITH TO MCALESTER
LINE BY MORNING.

WILL GO WITH SLIGHT CHANCE POPS FROM INTERSTATE 44 NORTH AND WEST
THIS EVENING AND ALSO SLIGHT CHANCE IN FAR SOUTHEAST OKLAHOMA. WILL
GO WITH A LITTLE HIGHER POPS IN BETWEEN WHERE CONVECTIVE PARAMETERS
APPEAR MAXIMIZED AFTER 00Z. WILL MAINTAIN LOW POPS IN FAR SOUTHEAST
OKLAHOMA TUESDAY AS FRONT SLOWS TO A CRAWL IN THAT AREA.

MUCH DRIER AIR FILTERING IN BEHIND THE FRONT ENSURES A SUNNY AND
SLIGHTLY COOLER DAY IN ALL BUT FAR SOUTHEAST OKLAHOMA TUESDAY.
MINIMAL COLD ADVECTION WILL MEAN ONLY SLIGHTLY LOWER DAYTIME
MAXIMUMS BUT MUCH DRIER AIR WILL MAKE FOR PLEASANTLY COOLER NIGHTS.

LITTLE IN THE WAY OF CLOUD COVER EXPECTED TUESDAY NIGHT AND
WEDNESDAY AS CLOSED UPPER LOW WILL BE WELL TO THE EAST. A WARMING
TREND WILL COMMENCE WEDNESDAY WITH THE RETURN OF LIGHT
SOUTHEASTERLY WINDS.

THE EXTENDED CONTINUES TO LOOK HOT AND DRY AS UPPER RIDGE REMAINS IN
CONTROL. ANOTHER COLD FRONT MAY APPROACH THE AREA BY LATE SATURDAY
BUT AGAIN APPEARS TO BE MOISTURE STARVED. A BIT COOLER WEATHER MAY BE
IN STORE BY SUNDAY IF THIS FRONT DOES INDEED MAKE IT THIS FAR.

STAYED FAIRLY CLOSE TO GUIDANCE TEMPERATURES EXCEPT WENT COOLER FOR
MINIMUMS TUESDAY NIGHT WITH CLEAR SKIES...DRY AIR AND LIGHT WINDS.

FCSTID = 5
TUL   65  93  62  95 /  20   0   0   0
FSM   68  95  64  96 /  30  10   0   0
MLC   68  95  62  97 /  30  10   0   0
BVO   62  92  60  94 /  20   0   0   0
FYV   62  88  55  90 /  30   0   0   0
BYV   62  88  55  90 /  30   0   0   0
MIO   62  90  58  92 /  20   0   0   0
MKO   66  94  62  96 /  30   0   0   0
F10   66  94  62  96 /  30   0   0   0
HHW   70  98  65  98 /  20  20  10   0

.TUL...
AR...NONE.
OK...NONE.

PLATE

--------------------
EXPERIMENTAL OUTPUT:

HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: CHANCE SEVERE
THUNDERSTORMS NGM CONFIDENCE:  6 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  8 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  8 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 9 ON A SCALE OF 0 TO 10

In the hours before

Special weather statement, Aug 23, 1:10 PM CDT, 4 hours 25 minutes before

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Special weather statement, Aug 23, 1:10 PM CDT, 4 hours 25 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 Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 23, 4:06 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	39 min
Aug 23, 4:36 PM CDT	Severe Thunderstorm Warning	TSA	Haskell	39 min
Aug 23, 5:06 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers, Wagoner	39 min
Aug 23, 5:45 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee, Wagoner	45 min
Aug 23, 5:45 PM CDT	Severe Thunderstorm Warning	TSA	Mayes	45 min
Aug 23, 6:08 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee, Tulsa	52 min
Aug 23, 6:30 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	45 min
Aug 23, 6:50 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	40 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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; radar from the NEXRAD Level II archive.