000
FXUS64 KOUN 211730
AFDOUN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1230 PM CDT TUE MAY 21 2013

.AVIATION...
THE MAIN CONCERN FOR THIS FORECAST ARE THE THUNDERSTORMS
CURRENTLY MOVING EAST ACROSS OKLAHOMA AND IMPACTING
KOKC...KOUN...AND KSPS. THESE STORMS SHOULD MOVE OUT BY 20Z.
SHOWERS MAY LINGER LONGER. OUTSIDE AREAS OF CONVECTION...WINDS
SHOULD REMAIN FAIRLY LIGHT THROUGHOUT THE TAF PERIOD. SOME BR WILL
BE A POSSIBILITY TOWARD SUNRISE AT OUR SOUTHERN AND EASTERN SITES.

&&

.PREV DISCUSSION... /ISSUED 1210 PM CDT TUE MAY 21 2013/

UPDATE...
MADE BRIEF UPDATES TO THE GOING FORECAST THIS MORNING. POPS WERE
SIGNIFICANTLY INCREASED OVER CENTRAL AND SOUTHERN OKLAHOMA AS
ONGOING COMPLEX CONTINUES TO MOVE EASTWARD. CURRENT THINKING BASED
ON RECENT HIGH RESOLUTION MODELS IS THAT MOST ACTIVITY WILL END
FROM WEST TO EAST THROUGH MID AFTERNOON. STILL...HEAVY RAINFALL,
FREQUENT LIGHTNING, AND SMALL HAIL WILL BE A THREAT TO ONGOING
SEARCH AND RESCUE OPERATIONS IN CENTRAL OKLAHOMA. SEVERE
THUNDERSTORMS WILL HAVE A GREATER WINDOW OF DEVELOPMENT OVER SOUTH
CENTRAL AND SOUTHEAST OKLAHOMA...NEARER THE GREATER INSTABILITY.

PREV DISCUSSION... /ISSUED 628 AM CDT TUE MAY 21 2013/

DISCUSSION...
12Z AVIATION DISCUSSION FOLLOWS....

AVIATION...
A VERY SLOWLY MOVING COLD FRONT HAS LIT UP WITH CONVECTION
OVERNIGHT...AND THESE STORMS ARE LIKELY TO CONTINUE ALONG THE
FRONT ALL DAY AND INTO THE EVENING. THE FRONT...AND THE AREA OF
STORMS...SHOULD MOVE SLOWLY SE THE REST OF THE DAY. HOWEVER...SOME
NORTHWARD DEVELOPMENT IS NOT OUT OF THE QUESTION THIS MORNING. IN
ANY CASE...TSRA SHOULD REMAIN S OF KPNC...KGAG...AND KWWR. THE
STORMS ARE EXPECTED TO MOVE SE OF OUR FORECAST AREA THIS
EVENING...LEAVING CLEARING SKIES AND LIGHT WINDS AT MOST SITES.
RECENT RAINS SUGGEST THAT SOME BR IS A GOOD POSSIBILITY TOWARD
SUNRISE AT ALL BUT OUR WESTERN SITES. WINDS WILL TURN AROUND TO S
OVERNIGHT OR TOMORROW MORNING.

PREV DISCUSSION... /ISSUED 322 AM CDT TUE MAY 21 2013/

DISCUSSION...
EARLY MODEL DIVERGENCE AND PERIODIC CONVECTIVE ACTIVITY WILL LEAD
TO A VERY LOW-CONFIDENCE FORECAST...ESPECIALLY AFTER SATURDAY.

THE SYNOPTIC-SCALE STORM SYSTEM THAT HAS PLAGUED OKLAHOMA AND
NORTH TEXAS WITH SEVERE WEATHER OVER THE PAST COUPLE OF DAYS HAS
SHIFTED SLIGHTLY TO THE SOUTHEAST. STORMS ARE LIKELY TO CONTINUE
TODAY...WITH PRIMARY EMPHASIS ACROSS THE SOUTHEAST PARTS OF OUR
FORECAST AREA. THE RISK OF SEVERE STORMS WILL BE MAINLY CONFINED
TO THE SOUTHEAST HALF OF OKLAHOMA...AND NORTH TEXAS FROM WICHITA
FALLS EAST.

THE COOLER AIR BEHIND THE SURFACE COLD FRONT WILL FINALLY MOVE
FARTHER SOUTH FOR WEDNESDAY...REDUCING THE CHANCES FOR STORMS FOR
A DAY OR TWO.

SOUTHERLY FLOW WILL BRING WARMTH AND MOISTURE BACK INTO NORTH
TEXAS AND OKLAHOMA LATE THIS WEEK. THIS WILL BRING ANOTHER SERIES
OF CHANCES FOR RAIN AS A LONG PARADE OF SHORTWAVE TROUGHS PASS
OVER THE SOUTHERN PLAINS WITHIN THE LONGWAVE TROUGH ANCHORED OVER
WESTERN NORTH AMERICA. EVEN IF THE MODEL FORECASTS WERE IN BETTER
AGREEMENT...THE TIMING OF SUCH WAVES IS DIFFICULT IN THIS TIME
FRAME.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  55  80  61  76 /  10  10  20  30
HOBART OK         54  87  61  82 /  10  10  20  30
WICHITA FALLS TX  57  89  64  85 /  10  10  10  20
GAGE OK           51  85  56  75 /  10  20  20  40
PONCA CITY OK     53  79  57  73 /  10  10  20  20
DURANT OK         60  85  64  82 /  40  10  10  20

&&

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

$$

99/99/14