Severe Thunderstorm Warning 161, NWS Raleigh, NC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
338 PM EDT THU MAY 25 2006

.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...
FAIRLY UNSTABLE ATMOSPHERE ACROSS PORTIONS OF THE COASTAL PLAIN THIS
AFTERNOON WITH DEWPOINTS IN THE MID 60S AND TEMPS IN THE UPPER 80S.
DEWPOINTS HAVE BEEN DROPPING THIS AFTERNOON ACROSS CENTRAL AND
WESTERN NC...WITH SOME LOCATIONS DROPPING FROM THE UPPER 60S INTO
THE UPPER 50S AND LOWER 60S COURTESY OF STRONG DIURNAL
HEATING/MIXING. LEE TROF AXIS APPEARS TO BE HUNG UP OVER THE
FOOTHILLS TO THE WEST OF THE AREA. AT THIS POINT...FEEL THAT THE
CHANCE FOR CONVECTION THIS AFTERNOON HAS DECREASED SIGNIFICANTLY...AND
THAT ANY CONVECTION THAT FIRES UP WILL DO SO ALONG DEWPOINT
DISCONTINUITIES ACROSS THE AREA OR ALONG THE SEABREEZE IN THE EXTREME
SOUTHEAST CORNER OF THE CWA. LOWERED POPS THE REMAINDER OF THIS
AFTERNOON.

PRECIP CHANCES TONIGHT SEEM TO BE DRIVEN BY WHETHER OR NOT MCS AND
ORGANIZED THUNDERSTORM ACTIVITY DEVELOPS IN TN/KY LATER THIS
AFTERNOON/EVENING AND CROSSES THE MOUNTAINS INTO THE AREA DURING THE
OVERNIGHT HOURS. ANY LOCAL CONVECTION THAT DEVELOPS THIS AFTERNOON
AND EVENING WILL QUICKLY WEAKEN AFTER SUNSET. WILL LEAVE A SLIGHT
CHANCE OF POPS DURING THE OVERNIGHT HOURS. GUIDANCE GIVES LOW TEMPS
TONIGHT IN THE UPPER 60S ACROSS THE AREA.

LARGE UPPER LEVEL LOW WILL MOVE EAST OR ESE INTO LAKE ERIE OR JUST
SOUTH INTO PA DURING THE DAY FRIDAY. ASSOC H5 TROF AND SFC FRONT
SHOULD WILL APPROACH THE AREA DURING THE EVENING HOURS. EXPECT
BETTER CHANCE OF CONVECTION TOMORROW WITH SIMILAR INSTABILITY BUT
BETTER DYNAMICS. EXPECT TOMORROW TO BE BREEZY...WITH WIND GUSTS OF
25 TO 30 MPH POSSIBLE DURING THE AFTERNOON AS WINDS ALOFT INCREASE
IN THE PRESENCE OF DEEP MIXING. SPC CONTINUES THE SLIGHT CHANCE FOR
SEVERE THUNDERSTORMS TOMORROW. GUIDANCE AND THICKNESSES SHOW HIGH
TEMPS SIMILAR TO TODAY...IN THE MID TO UPPER 80S...WITH A FEW
PLACES HITTING 90 OR 91 IN SOUTHERN PORTIONS OF THE CWA. CHANCE
FOR PRECIP WILL EXTEND INTO THE OVERNIGHT HOURS AS H5 TROF AND SFC
FRONT CROSS THE AREA. LOW TEMPS FRIDAY NIGHT WILL BE IN THE MID TO
UPPER 60S.

SATURDAY...H5 TROF MOVES OFF TO THE EAST WHILE SFC FRONT MOVES INTO
THE COASTAL PLAIN AND BEGINS TO WASH OUT...MOVING SOUTH OF THE AREA
BY SATURDAY NIGHT AND SUNDAY MORNING. WILL LEAVE A SLIGHT CHANCE OF
POPS ON SATURDAY MORNING ACROSS CENTRAL AND EASTERN PORTIONS OF THE
AREA...AND A SLIGHT CHANCE ON SATURDAY AFTERNOON IN THE COASTAL
PLAIN. GUIDANCE GIVES HIGH TEMPS IN THE MID TO UPPER 80S.

SKIES BEGIN TO CLEAR ON SUNDAY AS THE PATTERN FINALLY SHIFTS AND
DEEP H5 RIDGE BEGINS TO BUILD OVER THE AREA.

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...
HIGH PRESSURE SURFACE AND ALOFT DURING THE PERIOD WITH SURFACE HIGH
PRESSURE SLIPPING INTO THE ATLANTIC MONDAY NIGHT. SOME SMALL RISK
FOR AFTERNOON CONVECTION EACH DAY BUT NOTHING SO SOLID AS TO PUSH
RAIN CHANCES BEYOND ISOLATED TO SLIGHT. TEMPERATURES A FEW DEGREES
ABOVE NORMAL.

&&

.AVIATION...
CUMULUS BEGINNING TO DEVELOP IN THE EAST AT THIS TIME AS WEAK BAND
OF SHOWERS PROGRESSES EAST FROM THE FOOTHILLS. HAVE OMITTED
THUNDERSTORMS FROM THE FORECAST ON THE BASIS OF LIMITED EXPECTED
COVERAGE. THE SOUTHEAST SEEMS MOST FAVORED FOR CONVECTION MID
AFTERNOON INTO LATE EVENING. EXPECT SOME LIGHT FOG LATE TONIGHT
BUT ENOUGH MIXING AND DRYNESS ALOFT TO PRECLUDE STRATUS. GUSTY
WEST WINDS SOON AFTER SUNRISE FRIDAY.

&&

.RAH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...VINCENT
LONG TERM...RLH
AVIATION...RLH

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
1042 AM EDT THU MAY 25 2006

NCZ007>011-021>028-038>043-073>078-083>086-088-089-261445-
PERSON-GRANVILLE-VANCE-WARREN-HALIFAX-FORSYTH-GUILFORD-ALAMANCE-
ORANGE-DURHAM-FRANKLIN-NASH-EDGECOMBE-DAVIDSON-RANDOLPH-CHATHAM-
WAKE-JOHNSTON-WILSON-STANLY-MONTGOMERY-MOORE-LEE-HARNETT-WAYNE-
ANSON-RICHMOND-SCOTLAND-HOKE-CUMBERLAND-SAMPSON-
1042 AM EDT THU MAY 25 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL NORTH
CAROLINA.

.DAY ONE...TODAY AND TONIGHT
A TROUGH OF LOW PRESSURE WILL SHARPEN OVER THE PIEDMONT TODAY AS
AN UPPER LEVEL DISTURBANCE MOVES EASTWARD THROUGH THE REGION.
INCREASING LOW LEVEL MOISTURE AND THE HEATING OF THE DAY WILL
CAUSE THE ATMOSPHERE TO BECOME UNSTABLE... LEADING TO THE
DEVELOPMENT OF SCATTERED SHOWERS AND THUNDERSTORMS IN THE MID
AFTERNOON AND CONTINUING THROUGH THE EVENING. A FEW STORMS MAY
BECOME SEVERE... WITH WIND GUSTS OVER 55 MPH AND PENNY SIZED
HAIL. ALTHOUGH THUNDERSTORMS ARE POSSIBLE ACROSS CENTRAL NORTH
CAROLINA...THE FORMATION OF SEVERE STORMS WILL BE SLIGHTLY MORE
FAVORABLE ALONG AND EAST OF HIGHWAY ONE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A STRONGER LOW PRESSURE SYSTEM WILL APPROACH THE REGION FROM THE
NORTHWEST ON FRIDAY. AS WINDS ALOFT INCREASE AND THE ATMOSPHERE
BECOMES UNSTABLE ONCE AGAIN... SCATTERED TO NUMEROUS THUNDERSTORMS
WILL DEVELOP. SOME OF THESE STORMS COULD BECOME SEVERE IN THE
LATE AFTERNOON THROUGH EARLY EVENING. THE MAIN THREAT IS EXPECTED
TO BE FROM STRONG STRAIGHT LINE WINDS IN EXCESS OF 60 MPH... BUT
NICKEL SIZE IS ALSO POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER NETWORK ACTIVATION MAY BE NEEDED BOTH TODAY AND ON
FRIDAY.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
514 PM EDT THU MAY 25 2006

NCZ024-025-252215-
DURHAM-ORANGE-
514 PM EDT THU MAY 25 2006

...STRONG THUNDERSTORMS WILL MOVE ACROSS ORANGE AND DURHAM COUNTIES
THROUGH 615 PM EDT...

AT 514 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS 7 MILES
SOUTH OF EFLAND...OR ABOUT 9 MILES WEST OF CHAPEL HILL...MOVING EAST
AT 25 MPH.

SOME LOCATIONS AFFECTED BY THESE STORMS INCLUDE...CHAPEL HILL...
DURHAM...BETHESDA...GORMAN.

PEA SIZE HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED
WITH THESE THUNDERSTORMS.

BL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
523 PM EDT THU MAY 25 2006

NCZ024-025-252215-
DURHAM-ORANGE-
523 PM EDT THU MAY 25 2006

...STRONG THUNDERSTORMS WILL MOVE ACROSS DURHAM COUNTIES THROUGH 615
PM EDT...

AT 514 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS 7 MILES
SOUTH OF EFLAND...OR ABOUT 9 MILES WEST OF CHAPEL HILL...MOVING EAST
AT 25 MPH.

SOME LOCATIONS AFFECTED BY THESE STORMS
INCLUDE...DURHAM...BETHESDA... AND GORMAN.

PEA SIZE HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED
WITH THESE THUNDERSTORMS.

BL/REU

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
549 PM EDT THU MAY 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0525 PM     HAIL             2 N CHAPEL HILL         35.96N 79.04W
05/25/2006  E1.00 INCH       ORANGE             NC   TRAINED SPOTTER

            REPORTED BY TRAINED SPOTTER

&&

REU

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
558 PM EDT THU MAY 25 2006

NCZ041-252300-
WAKE-
558 PM EDT THU MAY 25 2006

...STRONG THUNDERSTORMS WILL MOVE ACROSS WAKE COUNTY THROUGH 700 PM
EDT...

AT 558 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS 17 MILES
WEST OF FALLS LAKE...OR ABOUT OVER DURHAM...MOVING EAST AT 25 MPH.

SOME LOCATIONS AFFECTED BY THESE STORMS INCLUDE...FALLS LAKE...
PURNELL...WAKE FOREST...ROLESVILLE.

PEA SIZE HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED
WITH THESE THUNDERSTORMS.

23