Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 552, NWS Norman, OK

August 25, 2007Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 25, 2007, 12:00 AM CDT for Payne County, Oklahoma. It was in force for 45 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 25, 2007, 12:00 AM CDT (05:00 UTC)
Expired: Aug 25, 2007, 12:45 AM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Payne County, OK

The radar

The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 05:01 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

Lamont, OK (KLMN), launched 00:00Z, 5.0 hours before the alert went out and 75 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: 1746 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1137 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.5

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 Aug 24, 3:04 PM CDT, 8 hours 56 minutes earlier.

Area forecast discussion, Aug 24, 3:04 PM CDT, 8 hours 56 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
304 PM CDT FRI AUG 24 2007

.DISCUSSION...
CONVECTION THAT HAS BEEN ONGOING ALL DAY ACROSS THE NORTHWEST HALF
OF OUR FORECAST AREA HAS HELD TEMPERATURES IN THE 70S AND LOWER
80S... WHILE LOWER 90S COVER MOST OF THE REST OF OUR AREA. THE
RATHER SHARP TEMPERATURE BOUNDARY LIES FROM NEAR ALTUS... TO
OKLAHOMA CITY... AND ON EAST TOWARD MUSKOGEE. THIS BOUNDARY MAY
BECOME THE FOCUS FOR STRONGER CONVECTION LATE THIS AFTERNOON AND
INTO THE EVENING. SUPPORT FROM AN UPPER-LEVEL TROUGH WILL LIKELY
SUSTAIN THE EXISTING CONVECTION AS WELL... AND MAY EVEN SET OFF
NEW STORMS LATER TONIGHT ACROSS OUR NORTHERN COUNTIES. CHANCES FOR
SEVERE STORMS ARE PRESENT... BUT NOT OPTIMAL. THE GREATEST SHEAR
IS OVER THE AREA OF THE LEAST INSTABILITY... AND VICE-VERSA. CAPE
VALUES ARE MODERATE TO HIGH JUST SOUTH OF THE SURFACE THERMAL
BOUNDARY... BUT WIND SHEAR IS WEAK.

THE EXACT OUTCOME OF CONVECTIVE DEVELOPMENT TONIGHT WILL HAVE A
SIGNIFICANT IMPACT ON WHAT HAPPENS ON SATURDAY. MODEL POP GUIDANCE
APPEARS TO BE TOO LOW... GIVEN THE FORECAST INSTABILITY AND THE
PROBABLE EXISTENCE OF SURFACE BOUNDARIES. THE PASSAGE OF THE UPPER
TROUGH... HOWEVER... WILL LIMIT CONVECTIVE DEVELOPMENT... SO WE
HAVE ABOVE-GUIDANCE VALUES... BUT NOT NEARLY AS HIGH AS TONIGHT.

AFTER TOMORROW NIGHT... IT APPEARS THAT WE WILL DRY OUT AGAIN FOR
A FEW DAYS... AS THE UPPER HIGH RESTORES ITS DOMINANCE OVER THE
SOUTHERN PLAINS AND THE SURFACE BOUNDARIES DISSIPATE. TOWARD MID-
WEEK... HOWEVER... ANOTHER FRONT IS FORECAST TO MOVE IN FROM THE
NORTHEAST... BRINGING YET ANOTHER CHANCE OF RAIN... AND SOMEWHAT
COOLER TEMPERATURES.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  70  90  70  93 /  70  30  20  10
HOBART OK         71  93  72  94 /  60  30  10   0
WICHITA FALLS TX  76  96  73  97 /  50  20  10   0
GAGE OK           66  90  67  94 /  50  20  20  10
PONCA CITY OK     71  88  71  94 /  70  20  20  10
DURANT OK         74  93  73  93 /  20  20  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

30/23

Hazardous weather outlook, Aug 24, 6:41 PM CDT, 5 hours 19 minutes before

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In the hours before

Special weather statement, Aug 24, 6:01 PM CDT, 5 hours 59 minutes before

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  <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.
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        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
Aug 24, 10:06 PM CDT	Severe Thunderstorm Warning	OUN	Noble	24 min
Aug 24, 11:07 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	38 min
Aug 24, 11:46 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	59 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2007 Every severe thunderstorm warning in 2007

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.