Alert archive / Oklahoma / Flash Flood Watches in 2015

Flash Flood Watch 5, NWS Norman, OK

May 27, 201548 counties in Oklahoma; 8 counties in Texas

NWS Norman, OK issued this flash flood watch at May 27, 2015, 2:40 PM CDT for 48 counties in Oklahoma; 8 counties in Texas. It took effect at May 27, 2015, 7:00 PM CDT. It was in force for 66 hr.

The area

The counties it named.

The facts

Issued: May 27, 2015, 2:40 PM CDT (19:40 UTC)
In effect from: May 27, 2015, 7:00 PM CDT
Expired: May 30, 2015, 1:00 PM CDT
In force: 66 hr
Issued by: NWS Norman, OK
Flood severity: None

All 56 counties

Alfalfa County, OK, Atoka County, OK, Beckham County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 19:39 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

Norman, OK (KOUN), launched 12:00Z, 7.7 hours before the alert went out and 67 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: 96 J/kg
Mixed-layer CIN: -307 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at May 27, 1:03 PM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, May 27, 1:03 PM CDT, 1 hour 37 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>

Hazardous weather outlook, May 27, 11:55 AM CDT, 2 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT WED MAY 27 2015

OKZ004>048-050>052-TXZ083>090-281700-
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-
1155 AM CDT WED MAY 27 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

.THUNDERSTORMS...
THERE IS A ENHANCED RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING ACROSS PART OF WESTERN OKLAHOMA AND WESTERN NORTH
TEXAS.

LOCATION...
THE ENHANCED RISK AREA IS GENERALLY WEST OF A WOODWARD TO ELK
CITY TO ALTUS AND VERNON...TEXAS LINE. FARTHER EAST...THERE IS A
SLIGHT RISK OF STORMS...GENERALLY WEST OF A LINE FROM CHEROKEE TO
EL RENO AND ARDMORE.

TIMING...
THE MOST LIKELY TIME FOR SEVERE STORMS WILL BE FROM
3 PM TO 10 PM...

IMPACTS...
LARGE HAIL UP TO TENNIS BALLS
DAMAGING WINDS UP TO 70 MPH...
LOCALLY HEAVY RAINFALL...
TORNADOES ARE POSSIBLE...ESPECIALLY ACROSS NORTHWEST OKLAHOMA...

DISCUSSION...
SCATTERED ELEVATED STORMS WILL MOVE ACROSS CENTRAL AND SOUTHERN
OKLAHOMA THROUGH MID AFTERNOON. THESE STORMS WILL PRODUCE BRIEF
HEAVY RAINFALL...SMALL HAIL...AND OCCASIONAL LIGHTNING.

BY MID TO LATE AFTERNOON...SEVERE STORMS ARE EXPECTED TO FORM IN
THE EASTERN TEXAS PANHANDLE AND FAR WESTERN OKLAHOMA AND ADJACENT
AREAS OF WESTERN NORTH TEXAS. STRONG INSTABILITY...AND MODERATE
DEEP LAYER SHEAR WILL SUPPORT ORGANIZED SEVERE STORMS...ESPECIALLY
IN THE ENHANCED RISK AREA. THUNDERSTORMS WILL BE SLOW MOVING...SO
LOCALLY HEAVY RAINFALL IS LIKELY...ALONG WITH THE RISK OF
DAMAGING HAIL AND WIND. AS STORMS DRIFT EAST DURING THE
EVENING...STORM INTENSITY WILL DECREASE.

.FLOODING...
NUMEROUS STREAMS...CREEKS...AND RIVERS REMAIN IN FLOOD ACROSS
PARTS OF OKLAHOMA AND WESTERN NORTH TEXAS.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS
THE RISK AREAS SHOULD PREPARE FOR SEVERE WEATHER OPERATIONS THIS
AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

NOT MUCH CHANGE TO THE ONGOING PATTERN IS EXPECTED THROUGH
SATURDAY. THIS WILL ALLOW FOR A RISK OF STRONG TO SEVERE
THUNDERSTORMS EACH DAY...AND A RISK OF HEAVY RAINFALL AND
ASSOCIATED FLOODING. THURSDAY NIGHT THROUGH SATURDAY MAY
HAVE THE HIGHEST CHANCES FOR STORMS. STORM CHANCES MAY
DECREASE SUNDAY THROUGH TUESDAY.

GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.

In the hours before

Special weather statement, May 27, 12:56 PM CDT, 1 hour 44 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>

Special weather statement, May 27, 1:05 PM CDT, 1 hour 35 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>

Special weather statement, May 27, 1:22 PM CDT, 1 hour 18 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>

Special weather statement, May 27, 1:40 PM CDT, 1 hour 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>

Special weather statement, May 27, 1:51 PM CDT, 49 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>

Special weather statement, May 27, 2:36 PM CDT, 4 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
May 26, 7:14 PM CDT	Special Weather Statement	OUN	Stephens	31 min
May 26, 7:20 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Garfield, Kingfisher, Major	40 min
May 26, 7:28 PM CDT	Special Weather Statement	OUN	Carter	47 min
May 26, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Major	49 min
May 26, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	46 min
May 26, 8:01 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson	21 min
May 26, 8:22 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	53 min
May 26, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	48 min
May 26, 8:32 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	43 min
May 26, 8:41 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	49 min
May 26, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Major, Woods	31 min
May 26, 8:50 PM CDT	Special Weather Statement	OUN	Custer	25 min
May 26, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	49 min
May 26, 9:04 PM CDT	Special Weather Statement	OUN	Garfield, Payne	26 min
May 26, 9:05 PM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Custer	55 min
May 26, 9:07 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	38 min
May 26, 9:08 PM CDT	Severe Thunderstorm Warning	OUN	Grant	25 min
May 26, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	49 min
May 26, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	49 min
May 26, 9:40 PM CDT	Special Weather Statement	OUN	Atoka	50 min
May 26, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble	33 min
May 26, 9:46 PM CDT	Tornado Warning	OUN	Logan	29 min
May 26, 9:51 PM CDT	Areal Flood Advisory	OUN	Blaine, Canadian, Kingfisher	3 hr
May 26, 9:52 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Kingfisher	53 min
May 26, 9:59 PM CDT	Special Weather Statement	OUN	Custer	31 min
May 26, 10:14 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble, Payne	46 min
May 26, 10:15 PM CDT	Areal Flood Advisory	OUN	Garfield, Kingfisher, Logan, Noble, Payne	2 hr
May 26, 10:37 PM CDT	Tornado Warning	OUN	Logan	23 min
May 26, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Dewey, Kingfisher	19 min
May 26, 10:48 PM CDT	Special Weather Statement	OUN	Dewey	27 min
May 26, 10:58 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble, Payne	47 min
May 26, 11:07 PM CDT	Flash Flood Warning	OUN	Garfield, Logan, Payne	3 hr
May 27, 6:24 AM CDT	Special Weather Statement	OUN	Comanche	51 min
May 27, 7:04 AM CDT	Special Weather Statement	OUN	Jefferson, Stephens	41 min
May 27, 9:02 AM CDT	River Flood Warning	OUN	Canadian, Cleveland, Grady, McClain	26 hr
May 27, 9:03 AM CDT	River Flood Warning	OUN	Hughes, Seminole	36 hr
May 27, 11:01 AM CDT	Special Weather Statement	OUN	Coal, Pontotoc	29 min
May 27, 12:03 PM CDT	Special Weather Statement	OUN	McClain	27 min
May 27, 12:18 PM CDT	Special Weather Statement	OUN	Pontotoc	27 min
May 27, 12:38 PM CDT	Special Weather Statement	OUN	Pottawatomie	37 min
May 27, 12:56 PM CDT	Special Weather Statement	OUN	Stephens	34 min
May 27, 1:05 PM CDT	Special Weather Statement	OUN	Pontotoc	25 min
May 27, 1:22 PM CDT	Special Weather Statement	OUN	Garvin	23 min
May 27, 1:40 PM CDT	Special Weather Statement	OUN	Garvin	35 min
May 27, 1:51 PM CDT	Special Weather Statement	OUN	Pontotoc	24 min
May 27, 2:15 PM CDT	Flash Flood Warning	OUN	Pontotoc	5 hr
May 27, 2:35 PM CDT	Areal Flood Advisory	OUN	Garvin, Murray, Pontotoc	3 hr
May 27, 2:36 PM CDT	Special Weather Statement	OUN	Murray	24 min
May 27, 3:24 PM CDT	Special Weather Statement	OUN	Garvin	36 min
May 27, 4:04 PM CDT	Special Weather Statement	OUN	Murray	26 min
May 27, 4:33 PM CDT	Special Weather Statement	OUN	Johnston	27 min
May 27, 4:53 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	37 min
May 27, 4:58 PM CDT	Special Weather Statement	OUN	Harper	47 min
May 27, 5:12 PM CDT	Special Weather Statement	OUN	Coal	48 min
May 27, 5:21 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	39 min
May 27, 5:29 PM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Johnston, Pontotoc	3 hr
May 27, 5:31 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	44 min
May 27, 6:02 PM CDT	Special Weather Statement	OUN	Cotton	28 min
May 27, 6:05 PM CDT	Special Weather Statement	OUN	Stephens	40 min
May 27, 6:25 PM CDT	Special Weather Statement	OUN	Tillman	35 min
May 27, 6:40 PM CDT	Special Weather Statement	OUN	Tillman	35 min
May 26, 7:26 PM CDT	Special Weather Statement	OUN	Jack	34 min
May 26, 7:39 PM CDT	Special Weather Statement	OUN	Archer	36 min
May 27, 3:39 PM CDT	Special Weather Statement	OUN	Clay	36 min
May 27, 3:59 PM CDT	Special Weather Statement	OUN	Archer	31 min
May 27, 4:18 PM CDT	Severe Thunderstorm Warning	OUN	Archer	42 min
May 27, 4:46 PM CDT	Special Weather Statement	OUN	Clay	14 min
May 27, 5:08 PM CDT	Special Weather Statement	OUN	Wichita	37 min
May 27, 5:15 PM CDT	Areal Flood Advisory	OUN	Clay	3 hr
May 27, 5:49 PM CDT	Areal Flood Warning	OUN	Clay	3 hr

Nearby

Flash Flood Watches in Oklahoma, 2015 Flash Flood Watches in Texas, 2015 Every flash flood watch in 2015

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.