Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 608, NWS Norman, OK

July 29, 2013Ellis County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 29, 2013, 9:32 PM CDT for Ellis County, Oklahoma. It was in force for 43 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: Jul 29, 2013, 9:32 PM CDT (02:32 UTC)
Expired: Jul 29, 2013, 10:15 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Ellis County, OK

The radar

The Vance AFB radar (KVNX), 157 km from the middle of the area, began a volume at 02:33 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
Jul 29, 2:38 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.5 hours before the alert went out and 240 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: 2590 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 13.9

Open this sounding in Storm Lab

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 Jul 29, 6:33 PM CDT, 2 hours 59 minutes earlier.

Area forecast discussion, Jul 29, 6:33 PM CDT, 2 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
633 PM CDT MON JUL 29 2013

.DISCUSSION...
THE 00Z AVIATION DISCUSSION FOLLOWS....

&&

.AVIATION...
A LARGE TSRA COMPLEX OVER KS AND FAR N OK WILL DRIFT SLOWLY ESE
THIS EVENING. TSRA ARE LIKELY AT KGAG...KWWR...AND KPNC. ISOLATED
TSRA MAY OCCUR NEAR OTHER TAF SITES THIS EVENING...BUT THE
PROBABILITIES AT ANY GIVE LOCATION WILL BE VERY LOW. THE STORM
COMPLEX MAY EXPAND SE INTO CENTRAL OK LATE TONIGHT...BUT ITS
EVOLUTION IS NOT YET CLEAR. WINDS WILL BE ERRATIC IN AND NEAR THE
TSRA COMPLEX TONIGHT. EXPECT VFR CONDITIONS TOMORROW...EXCEPT
PERHAPS BRIEFLY MVFR AT KPNC IN THE MORNING...AS REMNANTS OF THE
OVERNIGHT CONVECTION LINGER THERE. MODELS PLACE A SURFACE BOUNDARY
OVER N OK TOMORROW...BUT THE ACTUAL WIND FIELD FORECAST FOR
TOMORROW IS QUITE UNCLEAR AT THIS TIME...DEPENDING ON THE EFFECTS
OF THE STORM COMPLEX.

&&

.PREV DISCUSSION... /ISSUED 345 PM CDT MON JUL 29 2013/

DISCUSSION...
VERY HEAVY RAINFALL...FLASH FLOODING...AND SEVERE THUNDERSTORMS THIS
AFTERNOON THROUGH TUESDAY...PRIMARILY OVER PORTIONS OF NORTHERN
OKLAHOMA ARE THE GREATEST FORECAST CONCERNS.

A SHORTWAVE TROUGH CONTINUES TO MOVE OFF THE WRN HIGH PLAINS ACROSS
KS THIS AFTERNOON...PROVIDING A FOCUS FOR SHOWERS AND THUNDERSTORMS
ACROSS CENTRAL KS INTO CENTRAL OK. THROUGH 2 PM...VISIBLE SATELLITE
CONTINUES TO SHOW INCREASING CU DEVELOPMENT ALONG THE WEAK FRONTAL
BOUNDARY FROM THE PANHANDLES INTO CENTRAL KS. THIS WEAK FRONTAL
BOUNDARY WILL CONTINUE TO ADVANCE EWD THROUGH THE AFTERNOON AND
OVERNIGHT. MESOSCALE MODELS REMAIN IN RELATIVELY DECENT AGREEMENT...
WITH SCATTERED THUNDERSTORM DEVELOPMENT CONTINUING THROUGH THIS
AFTERNOON. ALTHOUGH DEEP LAYER SHEAR IS WEAK OVERALL...DECENT
INSTABILITY WILL ALLOW FOR STRONG TO POTENTIALLY SEVERE STORMS...
WITH LARGE DAMAGING HAIL AND WIND GUSTS OF 50 TO 60 MPH.

FOR TONIGHT...AVAILABLE MOISTURE WILL CONTINUE TO INCREASE THROUGH
THE AFTERNOON...WITH PWATS EXPECTED TO CLIMB INTO THE 1.7 TO 2.25 IN
RANGE FROM CENTRAL OK INTO SRN KS. IN RESPONSE...DECENT MUCAPES WILL
POOL ACROSS SRN KS/NRN OK THROUGH THE EVENING AND OVERNIGHT. THIS
WILL RESULT IN AFTERNOON CONVECTION MERGING INTO A POTENTIAL
COMPLEX/MCS OVERNIGHT. 0-3KM SHEAR OF 20 TO 30KTS COMBINED WITH THE
AVAILABLE INSTABILITY AND INCREASING LLJET...THIS SCENARIO SEEMS
LIKELY...WITH THE COMPLEX ADVANCING EWD ACROSS SRN KS INTO NRN/NWRN
OK. IN RESPONSE... ROUNDS OF HEAVY RAINFALL WILL BE THE PRIMARY
CONCERNS AS THIS SYSTEM TRACKS OVERNIGHT.

DUE TO EXPECTED HEAVY/EXCESSIVE RAINFALL TONIGHT...A FLASH FLOOD
WATCH REMAINS IN PLACE ALONG AND NORTH OF A LINE FROM CHEROKEE TO
CHANDLER. GIVEN THE RECENT FLASH FLOODING EVENTS ACROSS THE
REGION...IT CANNOT BE STRESSED ENOUGH THAT NO ONE...FOR ANY
REASON...DRIVE THROUGH FLOODED ROAD WAYS. ARRIVE ALIVE...TURN AROUND
DONT DROWN.

BEYOND TOMORROW MORNING...ANOTHER WEAK FRONTAL BOUNDARY WILL ENTER
THE AREA ON TUESDAY PROVIDING A FOCUS FOR CONTINUING SHOWERS AND
POTENTIAL THUNDER ACROSS THE REGION.

WEDNESDAY THROUGH THE WEEKEND...EXPECT A LULL IN PRECIP THROUGH
EARLY WEDNESDAY MORNING AS THE SHALLOW 500MB SHORTWAVE SHIFTS
EASTWARD ACROSS THE OZARKS TUE NIGHT/WED MORNING. ON ITS
HEELS...UPPER LEVEL RIDGING WILL BUILD OVER THE INTERMOUNTAIN WEST.
PRECIP CHANCES WILL RETURN QUITE QUICKLY...HOWEVER...AS A SFC LOW
DEVELOPS IN CONJUNCTION WITH A WEAK SHORTWAVE TRAVERSING THE UPPER
FLOW ACROSS THE CENTRAL PLAINS. AS A SERIES OF THESE WEAK IMPULSES
TRAVEL ACROSS THE PLAINS...RAIN CHANCES WILL CONTINUE ACROSS
NORTHERN OKLAHOMA FROM LATE THU THROUGH THE WEEKEND. AS FOR
TEMPS...SHOULD SEE A SLOW WARM UP THROUGH FRI...WITH HIGHS NEAR THE
100S ACROSS WESTERN NORTH TEXAS AND SOUTHWESTERN OKLAHOMA...AND
HIGHS IN THE MID TO UPPER 90S ELSEWHERE THROUGH THE WEEKEND.

MAD/JTK

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  72  93  72  94 /  50  30  20  10
HOBART OK         73  97  72  98 /  30  20  20  10
WICHITA FALLS TX  74  99  75 100 /  20  10  10  10
GAGE OK           69  93  69  94 /  50  20  10  10
PONCA CITY OK     69  91  71  92 /  90  30  20  10
DURANT OK         72  94  75  96 /  30  20  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH THROUGH TUESDAY AFTERNOON FOR OKZ006>008-012-
     013-019-020-026.

TX...NONE.
&&

02/23/23

Hazardous weather outlook, Jul 29, 8:00 PM CDT, 1 hour 32 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>

In the hours before

Special weather statement, Jul 29, 4:28 PM CDT, 5 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
428 PM CDT MON JUL 29 2013

OKZ004-292200-
HARPER OK-
428 PM CDT MON JUL 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HARPER COUNTY UNTIL
500 PM CDT...

AT 424 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 7 MILES SOUTHEAST
OF ENGLEWOOD...MOVING EAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...
HEAVY DOWNPOURS...

LAT...LON 3700 9962 3699 9961 3686 9958 3686 9971
      3687 9999 3688 10001 3700 10000
TIME...MOT...LOC 2124Z 258DEG 17KT 3695 9991

Special weather statement, Jul 29, 5:48 PM CDT, 3 hours 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
548 PM CDT MON JUL 29 2013

OKZ005-006-292330-
WOODS OK-ALFALFA OK-
548 PM CDT MON JUL 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WOODS AND ALFALFA
COUNTIES UNTIL 630 PM CDT...

AT 545 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
10 MILES NORTHWEST OF HARDTNER TO 7 MILES SOUTHEAST OF AETNA TO 12
MILES SOUTHEAST OF BUTTERMILK...MOVING SOUTHEAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 55 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...
FREQUENT CLOUD TO GROUND LIGHTNING...

LAT...LON 3672 9829 3665 9869 3677 9913 3679 9914
      3678 9919 3680 9925 3699 9925 3699 9813
TIME...MOT...LOC 2245Z 300DEG 26KT 3712 9878 3702 9886 3696 9921

MAXWELL

Special weather statement, Jul 29, 6:42 PM CDT, 2 hours 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
642 PM CDT MON JUL 29 2013

OKZ004-300015-
HARPER OK-
642 PM CDT MON JUL 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR HARPER COUNTY UNTIL 715 PM CDT...

AT 638 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 7 MILES WEST OF
BUFFALO...MOVING EAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

LAT...LON 3676 9983 3695 9984 3700 9945 3673 9944
TIME...MOT...LOC 2338Z 269DEG 17KT 3686 9975

MAXWELL

Special weather statement, Jul 29, 7:03 PM CDT, 2 hours 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
703 PM CDT MON JUL 29 2013

OKZ004-300030-
HARPER OK-
703 PM CDT MON JUL 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR HARPER COUNTY UNTIL 730 PM CDT...

AT 700 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR LAVERNE...
MOVING EAST AT 30 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 50 MPH...
MINOR FLOODING IN AREAS OF POOR DRAINAGE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3684 10000 3686 9953 3660 9955 3659 9957
      3665 10000
TIME...MOT...LOC 0000Z 274DEG 25KT 3675 9992

MAXWELL

Local storm report, Jul 29, 7:58 PM CDT, 1 hour 34 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
Jul 29, 7:01 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	44 min
Jul 29, 7:03 PM CDT	Special Weather Statement	OUN	Harper	27 min
Jul 29, 7:21 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	24 min
Jul 29, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woodward	52 min
Jul 29, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	46 min
Jul 29, 7:57 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	48 min
Jul 29, 8:05 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods, Woodward	40 min
Jul 29, 8:43 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods, Woodward	47 min
Jul 29, 8:47 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	43 min
Jul 29, 9:10 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Grant, Woods	3 hr
Jul 29, 9:28 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major	47 min
Jul 29, 9:37 PM CDT	Special Weather Statement	OUN	Woodward	38 min
Jul 29, 10:13 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	47 min
Jul 29, 10:17 PM CDT	Areal Flood Advisory	OUN	Ellis, Garfield, Major, Noble, Woods, Woodward	3 hr
Jul 29, 10:20 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	40 min
Jul 29, 10:27 PM CDT	Special Weather Statement	OUN	Dewey	48 min
Jul 29, 10:40 PM CDT	Special Weather Statement	OUN	Blaine, Canadian, Kingfisher, Lincoln, Logan, Oklahoma and 1 more	35 min
Jul 29, 10:59 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey, Kingfisher	46 min
Jul 29, 11:17 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Kingfisher	43 min
Jul 29, 11:23 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	52 min
Jul 29, 11:36 PM CDT	Special Weather Statement	OUN	Custer, Roger Mills, Washita	39 min
Jul 29, 11:47 PM CDT	Areal Flood Advisory	OUN	Blaine, Garfield, Kingfisher, Lincoln, Logan, Major and 2 more	3 hr
Jul 29, 11:55 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma, Payne	50 min
Jul 30, 12:00 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	45 min
Jul 30, 12:17 AM CDT	Special Weather Statement	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	43 min
Jul 30, 12:39 AM CDT	Special Weather Statement	OUN	Cleveland, Grady, McClain	51 min
Jul 30, 12:40 AM CDT	Flash Flood Warning	OUN	Kingfisher, Logan, Payne	3 hr
Jul 30, 12:49 AM CDT	Special Weather Statement	OUN	Oklahoma	41 min
Jul 30, 12:59 AM CDT	Areal Flood Advisory	OUN	Canadian, Grady, Oklahoma	3 hr
Jul 30, 12:59 AM CDT	Special Weather Statement	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	46 min
Jul 30, 1:02 AM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	43 min
Jul 30, 1:44 AM CDT	Special Weather Statement	OUN	Custer, Washita	46 min
Jul 30, 2:03 AM CDT	Areal Flood Advisory	OUN	Beckham, Custer, Dewey, Ellis, Roger Mills, Washita	117 min
Jul 30, 2:11 AM CDT	Special Weather Statement	OUN	Washita	34 min
Jul 30, 2:36 AM CDT	Areal Flood Advisory	OUN	Cleveland, Grady, Hughes, Lincoln, McClain, Oklahoma and 2 more	3 hr
Jul 30, 2:58 AM CDT	River Flood Warning	OUN	Dewey, Major, Woodward	5 hr
Jul 30, 4:02 AM CDT	Areal Flood Advisory	OUN	Beckham, Kiowa, Roger Mills, Washita	3 hr
Jul 30, 8:40 AM CDT	River Flood Warning	OUN	Major, Woods, Woodward	6 hr
Jul 30, 5:09 PM CDT	Special Weather Statement	OUN	Hughes	51 min
Jul 30, 6:47 PM CDT	Special Weather Statement	OUN	Hughes
Jul 30, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Pontotoc	51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013 Every 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.