Alert archive / Oklahoma / Special Weather Statements in 2015
Special Weather Statement, NWS Norman, OK
NWS Norman, OK issued this special weather statement at Apr 18, 2015, 12:49 PM CDT for Alfalfa County, Oklahoma. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2015, 12:49 PM CDT (17:49 UTC)
- Expired
- Apr 18, 2015, 1:15 PM CDT
- In force
- 26 min
- Issued by
- NWS Norman, OK
County Alfalfa County, OK
The radar
The Vance AFB radar (KVNX), 29 km from the middle of the area, began a volume at 17:51 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
Dodge City, (KDDC), launched 12:00Z, 5.8 hours before the alert went out and 179 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
- 192 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 897 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- -48 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
<!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>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Apr 18, 11:50 AM CDT, 59 minutes earlier.
Area forecast discussion, Apr 18, 11:50 AM CDT, 59 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, Apr 18, 11:50 AM CDT, 59 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NORMAN OK 1150 AM CDT SAT APR 18 2015 OKZ004>048-050>052-TXZ083>090-191000- 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- 1150 AM CDT SAT APR 18 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 AN ENHANCED RISK OF SEVERE STORMS ACROSS MUCH OF OKLAHOMA AND ALL OF WESTERN NORTH TEXAS. LOCATION... THE ENHANCED RISK AREA IS ALONG AND EAST OF A LINE FROM BUFFALO...TO CHEYENNE...TO MANGUM IN OKLAHOMA...TO QUANAH AND BENJAMIN IN WESTERN NORTH TEXAS....AND WEST OF A LINE FROM MEDFORD...TO OKLAHOMA CITY..TO . THE REMAINDER OF OKLAHOMA AND WESTERN NORTH TEXAS IS IN A SLIGHT RISK. TIMING... 3PM TO MIDNIGHT. IMPACTS... HAIL UP TO THE SIZE OF GOLF BALLS TO TENNIS BALLS...AND WIND GUSTS UP TO 70 MPH WILL BE THE MAIN CONCERNS. LOCALLY HEAVY RAIN WILL ALSO BE POSSIBLE. DISCUSSION... SHOWERS AND ISOLATED STORMS ASSOCIATED WITH A WEAK DISTURBANCE WILL CONTINUE TO DRIFT EASTWARD FROM CENTRAL THROUGH NORTHERN OKLAHOMA. THIS ACTIVITY WILL REMAIN NON-SEVERE WITH OCCASIONAL CLOUD TO GROUND LIGHTNING THE MAIN CONCERN. ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP LATER THIS AFTERNOON AND MOVE ACROSS THE AREA THROUGH TONIGHT. SUBSTANTIAL LOW CLOUDS OVER WESTERN OKLAHOMA AND WESTERN NORTH TEXAS HAVE RESULTED IN SLOW SURFACE HEATING AND DESTABILIZATION...BUT THESE WILL LIKELY LIFT WITH FURTHER SURFACE HEATING. WITH VERY LITTLE CAPPING...STORMS MAY DEVELOP MOST ANYWHERE ACROSS OKLAHOMA AND NORTH TEXAS...BUT THE MOST LIKELY AREA FOR STRONG TO SEVERE STORM DEVELOPMENT WILL BE NEAR A DRYLINE IN WESTERN OKLAHOMA AND WESTERN NORTH TEXAS. INSTABILITY AND WIND SHEAR THIS AFTERNOON AND EVENING WILL BE SUFFICIENT FOR VERY LARGE HAIL. THE STORMS COULD DEVELOP INTO ONE OR MORE LINES OR CLUSTERS THIS EVENING...RESULTING IN MORE OF A DAMAGING WIND THREAT. SHOWERS AND THUNDERSTORMS WILL LIKELY CONTINUE INTO SUNDAY BUT THE SEVERE WEATHER POTENTIAL IS EXPECTED TO DECREASE OVERNIGHT. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE AREA SHOULD PREPARE FOR SEVERE WEATHER OPERATIONS THIS AFTERNOON THROUGH THIS EVENING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... .THUNDERSTORMS... SHOWERS AND THUNDERSTORMS WILL LINGER INTO SUNDAY. SEVERE WEATHER IS UNLIKELY BUT A FEW STORMS MAY BECOME STRONG PRODUCING SMALL HAIL. SHOWER AND THUNDERSTORM CHANCES WILL RETURN MONDAY NIGHT THROUGH FRIDAY...AS A SERIES OF UPPER LEVEL SYSTEMS MOVE ACROSS THE SOUTHERN PLAINS. STRONG TO SEVERE THUNDERSTORM POTENTIAL WILL LIKELY EXIST FOR A TIME FROM MID TO LATE NEXT WEEK. GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK. EM/MBS/AUSTIN
In the hours before
Special weather statement, Apr 18, 12:49 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 1249 PM CDT SAT APR 18 2015 OKZ006-181815- ALFALFA OK- 1249 PM CDT SAT APR 18 2015 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ALFALFA COUNTY UNTIL 115 PM CDT... AT 1247 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR CARMEN... MOVING NORTH AT 15 MPH. HAZARDS INCLUDE... HAIL UP TO THE SIZE OF NICKELS... WIND GUSTS TO 40 MPH... LOCATIONS IMPACTED INCLUDE... CHEROKEE...CARMEN...LAMBERT AND INGERSOLL. PRECAUTIONARY/PREPAREDNESS ACTIONS... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. && LAT...LON 3656 9840 3656 9853 3680 9853 3680 9834 TIME...MOT...LOC 1747Z 187DEG 15KT 3660 9849 AUSTIN
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 1:15 PM CDT | Special Weather Statement | OUN | Alfalfa | 30 min |
| Apr 18, 1:58 PM CDT | Special Weather Statement | OUN | Alfalfa, Major | 32 min |
| Apr 18, 2:02 PM CDT | Special Weather Statement | OUN | Harper | 28 min |
| Apr 18, 2:32 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 43 min |
| Apr 18, 2:54 PM CDT | Special Weather Statement | OUN | Woods | 36 min |
| Apr 18, 3:01 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 44 min |
| Apr 18, 3:08 PM CDT | Special Weather Statement | OUN | Major | 37 min |
| Apr 18, 3:15 PM CDT | Special Weather Statement | OUN | Caddo | 30 min |
| Apr 18, 3:40 PM CDT | Special Weather Statement | OUN | Blaine | 35 min |
| Apr 18, 3:45 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 45 min |
| Apr 18, 3:47 PM CDT | Special Weather Statement | OUN | Major | 28 min |
| Apr 18, 3:49 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 41 min |
| Apr 18, 3:54 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Major, Woods | 51 min |
| Apr 18, 4:28 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 47 min |
| Apr 18, 4:36 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Tillman | 39 min |
| Apr 18, 4:43 PM CDT | Special Weather Statement | OUN | Ellis | 32 min |
| Apr 18, 4:47 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 43 min |
| Apr 18, 5:01 PM CDT | Special Weather Statement | OUN | Beckham | 29 min |
| Apr 18, 5:10 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Jackson, Kiowa, Tillman | 50 min |
| Apr 18, 5:13 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Roger Mills, Washita | 47 min |
| Apr 18, 5:19 PM CDT | Special Weather Statement | OUN | Garfield | 26 min |
| Apr 18, 5:26 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Grant | 49 min |
| Apr 18, 5:36 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 39 min |
| Apr 18, 5:51 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa, Washita | 39 min |
| Apr 18, 6:01 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Jefferson, Love | 44 min |
| Apr 18, 6:03 PM CDT | Special Weather Statement | OUN | Custer | 27 min |
| Apr 18, 6:11 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 49 min |
| Apr 18, 6:22 PM CDT | Special Weather Statement | OUN | Grady | 38 min |
| Apr 18, 6:24 PM CDT | Special Weather Statement | OUN | Harper | 36 min |
| Apr 18, 6:30 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa, Washita | 45 min |
| Apr 18, 6:35 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Garvin, Murray | 40 min |
| Apr 18, 6:38 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 52 min |
| Apr 18, 6:44 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Kiowa, Washita | 31 min |
| Apr 18, 6:45 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 20 min |
| Apr 18, 6:56 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Washita | 19 min |
| Apr 18, 6:59 PM CDT | Special Weather Statement | OUN | Garvin, McClain | 31 min |
| Apr 18, 3:26 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor | 49 min |
| Apr 18, 4:10 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Wichita, Wilbarger | 50 min |
| Apr 18, 6:46 PM CDT | Special Weather Statement | OUN | Wichita | 29 min |
Nearby
Special Weather Statements in Oklahoma, 2015Every special weather statement 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.