Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 131, NWS Tulsa, OK

April 27, 2009Nowata County, Osage County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 27, 2009, 3:13 PM CDT for Nowata County, Osage County, Washington County, Oklahoma. It was in force for 30 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
Apr 27, 2009, 3:13 PM CDT (20:13 UTC)
Expired
Apr 27, 2009, 3:43 PM CDT
In force
30 min
Issued by
NWS Tulsa, OK
Area
Storm-based polygon

Counties Nowata County, OK, Osage County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 70 km from the middle of the area, began a volume at 20:14 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.

IssuedProductOfficeLasted
Apr 27, 12:47 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 8.2 hours before the alert went out and 135 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-pSkew-T log-p diagram, Lamont, OK at 12:00Z on 2009-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1225 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lamont, OK at 12:00Z on 2009-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 303 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1225 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
567 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
303 m²/s²
0-3 km storm-relative helicity
269 m²/s²
Significant tornado parameter
2.1
Supercell composite
11.6

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 27, 1:18 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Apr 27, 1:18 PM CDT, 1 hour 55 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
118 PM CDT MON APR 27 2009

...UPDATE...

.DISCUSSION...
ISSUED A SHORT WIND ADVISORY FROM ROUGHLY MCALESTER TO SALLISAW TO
ROGERS...WITH MESONET OBSERVATIONS SHOWING SOME GUSTINESS FROM THE
DYING MCS IN SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS. STIGLER
MESONET HAS BEEN GUSTING ABOVE 40 FOR ABOUT AN HOUR...WITH SOME
GUSTS GETTING VERY CLOSE TO HIGH WIND WARNING LEVELS...AND NO SIGN
OF REAL DECREASE. WILL MONITOR FOR POSSIBLE UPGRADES TO HIGH WIND
WARNING BEFORE THE WIND THREAT FINALLY DECREASES.

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...FLASH FLOOD WATCH UNTIL 7 AM TUESDAY FOR OKZ049-OKZ053-OKZ072-
     OKZ073-OKZ074-OKZ075-OKZ076.

     WIND ADVISORY UNTIL 4 PM MONDAY FOR OKZ069-OKZ070-OKZ072-OKZ073-
     OKZ074.

AR...FLASH FLOOD WATCH UNTIL 7 AM TUESDAY FOR ARZ001-ARZ002-ARZ010-
     ARZ011-ARZ019-ARZ020-ARZ029.

     WIND ADVISORY UNTIL 4 PM MONDAY FOR ARZ001-ARZ010.

&&

SHORT TERM...22
LONG TERM....05
Hazardous weather outlook, Apr 27, 3:10 PM CDT, 3 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, Apr 27, 12:17 PM CDT, 2 hours 56 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1217 PM CDT MON APR 27 2009

OKZ070-072-074-076-271800-
HASKELL OK-LE FLORE OK-MUSKOGEE OK-SEQUOYAH OK-
1217 PM CDT MON APR 27 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 100 PM CDT
FOR THE FOLLOWING COUNTIES...

IN EAST CENTRAL OKLAHOMA
     SOUTHEASTERN MUSKOGEE AND SEQUOYAH

IN SOUTHEAST OKLAHOMA
     HASKELL AND NORTHERN LE FLORE

AT 1215 PM CDT...STRONG OUTFLOW WINDS OF 40 TO 50 MPH WERE OCCURRING
ALONG THE NORTHERN EDGE OF A LARGE AREA OF SHOWERS AND THUNDERSTORMS
THAT COVERED MUCH OF SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS.

A LARGE PORTION OF SOUTHEASTERN MUSKOGEE...SEQUOYAH...HASKELL AND
NORTHERN LE FLORE COUNTIES WILL BE AFFECTED BY THESE HIGH WINDS
THROUGH 100 PM CDT.

LAT...LON 3509 9535 3516 9535 3556 9529 3557 9446
      3545 9444 3512 9444
TIME...MOT...LOC 1715Z 214DEG 32KT 3521 9508
Special weather statement, Apr 27, 2:17 PM CDT, 56 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 Tulsa, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 7:25 PM CDTWind AdvisoryTSACraig, Creek, McIntosh, Mayes, Muskogee, Nowata and 7 more3 hr
Apr 26, 10:15 PM CDTSpecial Weather StatementTSAOkfuskee, Okmulgee, Pittsburg60 min
Apr 26, 10:32 PM CDTSpecial Weather StatementTSACreek, Pawnee28 min
Apr 26, 10:54 PM CDTSpecial Weather StatementTSAOsage, Pawnee66 min
Apr 26, 11:37 PM CDTSpecial Weather StatementTSACreek, Nowata, Rogers, Tulsa, Wagoner, Washington53 min
Apr 27, 12:26 AM CDTSpecial Weather StatementTSACraig, Mayes, Muskogee, Nowata, Okmulgee, Ottawa and 2 more64 min
Apr 27, 12:27 AM CDTSpecial Weather StatementTSAOsage63 min
Apr 27, 1:25 AM CDTSpecial Weather StatementTSADelaware, Mayes, Ottawa65 min
Apr 27, 1:59 AM CDTSpecial Weather StatementTSACherokee, Delaware, Mayes, Wagoner61 min
Apr 27, 2:56 AM CDTFlash Flood WatchTSAChoctaw, Haskell, Latimer, Pittsburg, Pushmataha13 hr
Apr 27, 11:05 AM CDTRiver Flood WarningTSAOttawa8 days
Apr 27, 12:17 PM CDTSpecial Weather StatementTSAHaskell, Sequoyah43 min
Apr 27, 12:28 PM CDTAreal Flood AdvisoryTSAChoctaw2 hr
Apr 27, 1:13 PM CDTWind AdvisoryTSAAdair, Haskell, Muskogee, Pittsburg3 hr
Apr 27, 1:35 PM CDTSevere Thunderstorm WarningTSAOsage40 min
Apr 27, 1:37 PM CDTSevere Thunderstorm WarningTSAPawnee53 min
Apr 27, 2:17 PM CDTAreal Flood AdvisoryTSAOsage, Pawnee88 min
Apr 27, 2:17 PM CDTSpecial Weather StatementTSAOsage43 min
Apr 27, 2:17 PM CDTSevere Thunderstorm WarningTSAOsage, Pawnee46 min
Apr 27, 2:27 PM CDTSevere Thunderstorm WarningTSAOsage63 min
Apr 27, 3:05 PM CDTSevere Thunderstorm WarningTSANowata, Osage, Washington40 min
Apr 27, 3:42 PM CDTAreal Flood AdvisoryTSACraig, Nowata, Osage, Rogers, Washington93 min
Apr 27, 4:20 PM CDTSpecial Weather StatementTSAWashington25 min
Apr 27, 6:03 PM CDTSpecial Weather StatementTSARogers27 min
Apr 27, 2:50 AM CDTSpecial Weather StatementTSABenton55 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009Every severe thunderstorm warning in 2009

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.