Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 620, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 6, 2013, 7:56 PM CDT for Ellis County, Harper County, Woodward County, Oklahoma. It was in force for 49 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 6, 2013, 7:56 PM CDT (00:56 UTC)
- Expired
- Aug 6, 2013, 8:45 PM CDT
- In force
- 49 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Ellis County, OK, Harper County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 131 km from the middle of the area, began a volume at 00:56 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 |
|---|---|---|---|
| Aug 6, 3:38 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Dodge City, (KDDC), launched 00:00Z, 0.9 hours before the alert went out and 147 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
- 2241 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Aug 6, 3:01 PM CDT, 4 hours 55 minutes earlier.
Area forecast discussion, Aug 6, 3:01 PM CDT, 4 hours 55 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
301 PM CDT TUE AUG 6 2013
.DISCUSSION...
VERY WARM AGAIN TODAY WITH HEAT INDICES CURRENTLY EXCEEDING THE
CENTURY MARK FOR MOST LOCATIONS ACROSS THE FA. TONIGHT WILL BE
VERY SIMILAR TO LAST NIGHT AS STORMS DEVELOP OFF THE HIGH PLAINS
AND ALONG A STATIONARY FRONT NEAR NORTHERN OK...AND TRACK
EASTWARD. DECIDED TO INCREASE POPS TO AT LEAST LIKELY ALONG THE
NORTHERN BORDER TONIGHT. WILL KEEP LOW CHC POPS IN THE NW BEFORE
18Z TOMORROW ALONG SFC CONVERGENCE ASSOCIATED WITH THE FRONT NEAR
THIS AREA. EXPECT SOME SCATTERED DEVELOPMENT ACROSS CENTRAL OK
BEFORE/AROUND 00Z AS THE FRONT THEN SLIDES TO THE SOUTH AND STALLS
THERE...BUT THE HIGHEST CHANCES ARE STILL ANTICIPATED AROUND 03-9Z
AS INITIAL IMPULSE FROM THE SHORTWAVE TROUGH OVER THE SOUTHERN
ROCKIES TRAVERSES SOUTHERN KS. THE GFS HAS THE STRONGEST LIFT
SHIFTED A BIT TO THE SOUTH...BUT MOST NWP MODELS SUGGEST BEST
ISENTROPIC ASCENT ACROSS THE NORTHERN/NW HALF SO SHIFTED THEM N/NW
SLIGHTLY.
AT LEAST LOW CHC POPS WILL LINGER THROUGH FRIDAY MORNING AS A
SHORTWAVE TROUGH PASSES OVERHEAD. THEY WILL SLOWLY DECREASE FROM
NORTH TO SOUTH THROUGH FRIDAY NIGHT AS THE FRONT PUSHES ALL THE
WAY INTO NORTH TX. TEMPS WILL DROP AROUND 10 DEGREES FOR MOST
LOCATIONS BY SATURDAY AS A SFC RIDGE AXIS EXTENDS THROUGH OK FROM
THE NE. FOR THE EXTENDED...THE MID TO UPPER RIDGE WILL SHIFT
WESTWARD AND OK WILL RETURN TO WNW FLOW ALOFT. RAIN CHANCES WILL
LIKELY CONTINUE WITH THIS PATTERN...ALONG WITH NEAR TO BELOW AVG
MAX TEMPS.
&&
.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK 76 100 77 93 / 10 20 40 20
HOBART OK 78 103 77 96 / 10 20 30 20
WICHITA FALLS TX 79 107 80 102 / 0 20 30 20
GAGE OK 71 93 72 86 / 40 50 50 20
PONCA CITY OK 75 92 75 86 / 40 30 70 40
DURANT OK 77 104 79 101 / 0 10 10 10
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...HEAT ADVISORY UNTIL 1 AM CDT WEDNESDAY FOR OKZ004>024-033>035.
HEAT ADVISORY UNTIL 1 AM CDT THURSDAY FOR OKZ025>032-036>048-
050>052.
TX...HEAT ADVISORY UNTIL 1 AM CDT THURSDAY FOR TXZ083>090.
&&
02/03Hazardous weather outlook, Aug 6, 5:11 PM CDT, 2 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
511 PM CDT TUE AUG 6 2013
OKZ004>048-050>052-TXZ083>090-071100-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
511 PM CDT TUE AUG 6 2013
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...THIS EVENING AND OVERNIGHT...
THUNDERSTORM OUTLOOK...
SCATTERED THUNDERSTORMS WILL BE SEEN ACROSS NORTHERN PORTIONS OF
OKLAHOMA THIS EVENING INTO THE OVERNIGHT HOURS.
DISCUSSION...
A COLD FRONT WILL BE LOCATED NEAR THE OKLAHOMA AND KANSAS BORDER
AND WILL BE THE PRIMARY FOCUSING MECHANISM FOR THUNDERSTORM
DEVELOPMENT. THIS FRONT IS EXPECTED TO MOVE SLOWLY SOUTH THIS
EVENING AND OVERNIGHT. AS THIS OCCURS SCATTERED SHOWERS AND
THUNDERSTORMS WILL BE POSSIBLE. A FEW OF THE STORMS THROUGH THE
EVENING HOURS MAY BECOME STRONG ENOUGH TO PRODUCE DAMAGING WIND
GUSTS OVER FAR NORTHERN PARTS OF OKLAHOMA.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY AUG 7.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...25 PERCENT.
OTHER HAZARDOUS WEATHER...
A HEAT ADVISORY IS IN EFFECT FOR MOST OF THE REGION THROUGH THIS
EVENING. PLEASE TAKE STEPS TO PREVENT HEAT RELATED ILLNESSES.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...
THUNDERSTORM OUTLOOK...
STORM CHANCES WILL SPREAD SOUTH INTO CENTRAL AND SOUTHERN OKLAHOMA
AND WESTERN NORTH TEXAS THROUGH THE END OF THE WORK WEEK AND INTO
THE WEEKEND AS A WEAK COLD FRONT MOVES SLOWLY OVER THE REGION. THE
BEST CHANCE FOR STORMS WILL BE LATE WEDNESDAY THROUGH THURSDAY NIGHT.
A FEW SEVERE STORMS WILL BE POSSIBLE ACROSS THE REGION WITH DAMAGING
WIND GUSTS THE PRIMARY CONCERN. HEAVY RAINFALL THAT COULD LEAD TO
FLOODING WILL ALSO BE POSSIBLE...MAINLY OVER NORTHERN PARTS OF
OKLAHOMA.
OTHER HAZARDOUS WEATHER...
HOT CONDITIONS WILL CONTINUE THROUGH WEDNESDAY EVENING MAINLY ACROSS
THE SOUTHERN HALF OF OKLAHOMA AND ALL OF WESTERN NORTH TEXAS. A HEAT
ADVISORY IS IN EFFECT FOR PORTIONS OF CENTRAL AND SOUTHERN OKLAHOMA
AND ALL OF WESTERN NORTH TEXAS THROUGH WEDNESDAY EVENING. PLEASE TAKE
STEPS TO PREVENT HEAT RELATED ILLNESSES.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
WEDNESDAY.In the hours before
Special weather statement, Aug 6, 4:28 PM CDT, 3 hours 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
428 PM CDT TUE AUG 6 2013
OKZ009-014-062200-
ROGER MILLS OK-ELLIS OK-
428 PM CDT TUE AUG 6 2013
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROGER MILLS AND
SOUTHWESTERN ELLIS COUNTIES UNTIL 500 PM CDT...
AT 425 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 9 MILES NORTHWEST
OF DURHAM...MOVING NORTHEAST AT 20 MPH.
HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
HAIL UP TO THE SIZE OF NICKELS...
LAT...LON 3609 9998 3619 9981 3616 9979 3596 9965
3595 9967 3585 9999 3607 10000
TIME...MOT...LOC 2125Z 240DEG 18KT 3596 10000
..SPEG.Special weather statement, Aug 6, 5:15 PM CDT, 2 hours 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 515 PM CDT TUE AUG 6 2013 OKZ009-014-062245- ROGER MILLS OK-ELLIS OK- 515 PM CDT TUE AUG 6 2013 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROGER MILLS AND SOUTHERN ELLIS COUNTIES UNTIL 545 PM CDT... AT 512 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR THE ANTELOPE HILLS ABOUT 6 MILES NORTHEAST OF DURHAM...MOVING NORTHEAST AT 30 MPH. HAZARDS INCLUDE... WIND GUSTS TO 50 MPH... HAIL UP TO THE SIZE OF NICKELS... LAT...LON 3598 10000 3618 9960 3593 9946 3581 9990 TIME...MOT...LOC 2212Z 244DEG 24KT 3593 9987 ..SPEG.
Local storm report, Aug 6, 7:09 PM CDT, 47 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 |
|---|---|---|---|---|
| Aug 6, 7:13 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Harper, Woodward | 47 min |
| Aug 6, 9:50 PM CDT | Special Weather Statement | OUN | Alfalfa, Major | 25 min |
| Aug 7, 2:41 AM CDT | Special Weather Statement | OUN | Beckham, Ellis, Roger Mills, Woods, Woodward | 49 min |
| Aug 7, 4:51 AM CDT | Special Weather Statement | OUN | Beckham, Custer, Dewey, Woods, Woodward | 39 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2013Every severe thunderstorm warning in 2013
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.