Severe Thunderstorm Warning 189, NWS Blacksburg, VA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG, VA
1008 AM EDT SAT JUL 19 2003

SFC FRONT STILL BACK OVR CNTRL WV AND INTO NRN VA...WITH GOOD LOW
LVL MSTR STILL IN PLACE AND NOW BEGINING TO GET ENOUGH CLEARING FOR
SOME GOOD HTG.  FROM THAT PERSPECTIVE TSTM CHANCES LOOK GOOD.
LIMITING FACTOR IS MID-LVL DRY AIR STARTING TO PUSH IN FROM THE NW
AS SEEN IN WV...AND IAD SNDG SHOWING STRONG SUBSIDENCE INV AND DRY
AIR ABV 750 MB.  SHWRS FROM EARLIER THIS MRNG TEMPORARILY STBLZD
GOOD CHUNK OF SW VA AND SE WV...BUT APPEARS TO HAVE LEFT WEAK BNDRY
SOMEWHERE ACROSS CNTRL PART OF AREA.  WHERE HTG AND LOW LVL
CONVERGENCE IS STRONG ENOUGH TO PUNCH UPDRAFTS THRU MID LVL
CAP...THE DRY AIR ALOFT AND MARGINAL SHEAR MAY HELP SOME STORMS TO
REACH SEVERE WIND THRESHOLDS...BUT FEEL THIS WILL MAINLY BE FAR SRN
PART OF AREA BY THE TIME HTG MAXIMIZES.  WILL KEEP A LOW CHC POP UP
ALMOST ALL LOCATIONS EXCEPT FAR NW...BUT EXPECT MOST CONVECTION WILL
HAVE A HARD TIME REACHING DEEP ENOUGH LEVELS TO SUPPORT STRONG
DOWNDRAFTS...MAYBE NOT EVEN MUCH LTG...SO WILL RE-FOCUS SLGT RISK
AREA ON NC COUNTIES AND EXTREME SRN VA COUNTIES...WHERE SBCAPES ARE
ALREADY OVR 1000 IN SOME SPOTS.

TEMPS LOOK OK AT THIS POINT...COULD GET A TAD HIGHER IN FAR SW...BUT
DID MAKE SOME TWEAKS TO CLOUDS IN THE GRIDS.

.RNK...
NC...NONE.
VA...NONE.
WV...NONE.

KEIGHTON

****************************************
328 AM DISCUSSION...

FRONTAL SYSTEM SLOWLY MAKING ITS WAY SOUTH OUT OF OHIO VALLEY...WITH
ACTIVE CONVECTION ACROSS CNTRL WV JUST AHEAD OF IT. S/WV AND 95KT
JET MAX NEAR LAKE MICHIGAN SHOULD CONTINUE PUSHING FRONT SOUTH AND
EAST...BUT RELATIVELY SLOWLY.  CONVERGENCE ZONE MAY GET HUNG UP IN
APPALACHIANS...AND THETA-E RDG STILL FCST TO BE NOSING INTO SW VA BY
LATE IN THE DAY.  DRIER AIR ALOFT WILL BE WHAT PUSHES SOUTHEAST THE
FASTEST...AND WHILE THIS COULD BEGIN LIMITING CONVECTION IN THE
NORTH AND WEST BY EARLY AFT...IT WILL ALSO HELP TO INCREASE
POTENTIAL FOR DOWNBURST WINDS.  LOW LVL SHEAR ALSO ENOUGH TO SUPPORT
ORGINAZED CONVECTION...AND EXPECT A STRONG LINE OF STORMS MAY FORM
SOMEWHERE ACROSS CNTRL PART OF THE FA BY EARLY AFT...AND PUSH
THROUGH TO SOUTHEAST BY EARLY EVE.  SPC SLGT RISK AREA LOOKS GOOD
AND WILL BE ISSUING OUTLOOK AFTER 6AM.

AS FAR AS POPS...STILL EXPECT CURRENT CONVECTION IN SE WV TO
DIMINISH SOMEWHAT BY SUNRISE...AND WILL KEEP A SLIGHT CHC UP
THERE...CHC ELSEWHERE...AND HIGH CHC BY AFT FOR SRN SECTIONS WHERE
BEST CONV ZONE IS EXPECTED TO BE AS HTG GETS GOING.  KEPT CHC POPS
SRN SECTION THROUGH LATE EVE PER SOME LINGERING HIGH CAPES IN
ETA...JUST IN CASE FRONTAL OR OUTFLOW BOUNDARY CONV ZONES ARE STILL
AROUND...BUT IF ORGANIZED LINE CAN FORM AND PUSH THROUGH...SUSPECT
CHANCHES WILL DIE QUICK WITH SUN WITH ALL THE MID LEVEL DRY AIR
AROUND.  THEN...DRY FOR SUNDAY WITH HIGH PRESSURE IN CONTROL AND
SHOULD GET A BIT WARMER WITH MORE SUNSHINE.

HAVE BUMPED UP HIGHS A BIT SUNDAY BUT NOSED DOWN A BIT IN WEST FOR
SATURDAY WITH MORE CLOUDS EXPECTED.

FINALLY...MOISTURE RETURN FOR MONDAY BUT SUBSIDENCE OUT AHEAD OF
NEXT SYSTEM MAY KEEP CONVECTION FROM FIRING UNTIL LATE...AND MAYBE
ONLY IN MTNS.  TRIMMED BACK POPS IN EAST TO SLGT CHC FOR MONDAY.  NO
CHANGES BEYOND THAT OTHER THAN TO INCREASE CLOUDS A BIT TUESDAY.  50
POPS LOOK GOOD BUT MAY NEED TO GO HIGHER WITH ABNORMALLY STRONG TROF
FOR LATE JULY APPROACHING.  WEATHER COULD BE VERY INTERESTING BY MID
WEEK...COULD SEEM MORE LIKE MAY WEATHER.

NCZ001>006-018-019-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-201100-

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE BLACKSBURG VA
1055 AM EDT SAT JUL 19 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WEST VIRGINIA...
WESTERN AND CENTRAL VIRGINIA...AS WELL AS NORTHWEST NORTH CAROLINA.

.DAY ONE...TODAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON...
MAINLY EAST OF THE BLUE RIDGE ACROSS FAR SOUTHERN VIRGINIA...AND
EAST OF THE BLUE RIDGE ACROSS NORTHWEST AND NORTH CENTRAL NORTH
CAROLINA.

SCATTERED THUNDERSTORMS ARE EXPECTED TO REDEVELOP DURING THE EARLY
AFTERNOON ACROSS SOUTHWEST VIRGINIA AND NORTHWEST NORTH
CAROLINA...OUT AHEAD OF A COLD FRONT. AS THEY SPREAD SOUTHEASTWARD
INTO FAR SOUTHERN VIRGINIA AND NORTHERN NORTH CAROLINA BY MID
AFTERNOON...A FEW COULD BECOME STRONG TO SEVERE.

THE MAIN THREAT FROM THESE STORMS WILL BE DAMAGING WINDS...HOWEVER
HAIL UP TO THE SIZE OF PENNIES AS WELL AS TORRENTIAL DOWNPOURS ARE
ALSO A POSSIBILITY. REMEMBER...ALL THUNDERSTORMS PRODUCE DANGEROUS
LIGHTNING...AND THE SAFEST PLACE TO BE WHEN THUNDERSTORMS APPROACH
IS INSIDE.

STORM SPOTTER ACTIVATION MAY BE REQUIRED LATER THIS AFTERNOON AND
INTO EARLY THIS EVENING.  STAY TUNED TO NOAA WEATHER RADIO AND OTHER
LOCAL MEDIA OUTLETS FOR FURTHER DETAILS OR UPDATES.

THIS PRODUCT CAN BE VIEWED ON THE BLACKSBURG OFFICE INTERNET PAGE AT
WWW.ERH.NOAA.GOV/ER/RNK.

.DAYS TWO THROUGH SEVEN...

A VIGOROUS FRONTAL SYSTEM IS EXPECTED TO APPROACH FROM THE WEST ON
TUESDAY...BRINGING THE POSSIBILITY OF STRONG TO SEVERE
THUNDERSTORMS.  AT THIS TIME IT IS TOO EARLY TO DETERMINE THE TIME
OF DAY THE FRONT WILL MOVE THROUGH...WHICH WILL BE IMPORTANT TO THE
DEVELOPMENT OF POTENTIALLY STRONG STORMS.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

SK

NCZ003>006-019-020-VAZ032-043-044-058-059-192115-
SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
1045 AM EDT SAT JUL 19 2003

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON...
MAINLY EAST OF THE BLUE RIDGE ACROSS FAR SOUTHERN VIRGINIA...AND
EAST OF THE BLUE RIDGE ACROSS NORTHWEST AND NORTH CENTRAL NORTH
CAROLINA.

SCATTERED THUNDERSTORMS ARE EXPECTED TO REDEVELOP DURING THE EARLY
AFTERNOON ACROSS SOUTHWEST VIRGINIA AND NORTHWEST NORTH
CAROLINA...OUT AHEAD OF A COLD FRONT. AS THEY SPREAD SOUTHEASTWARD
INTO FAR SOUTHERN VIRGINIA AND NORTHERN NORTH CAROLINA BY MID
AFTERNOON...A FEW COULD BECOME STRONG TO SEVERE.

THE MAIN THREAT FROM THESE STORMS WILL BE DAMAGING WINDS...HOWEVER
HAIL UP TO THE SIZE OF PENNIES AS WELL AS TORRENTIAL DOWNPOURS ARE
ALSO A POSSIBILITY. REMEMBER...ALL THUNDERSTORMS PRODUCE DANGEROUS
LIGHTNING...AND THE SAFEST PLACE TO BE WHEN THUNDERSTORMS APPROACH
IS INSIDE.

STORM SPOTTER ACTIVATION MAY BE REQUIRED LATER THIS AFTERNOON AND
INTO EARLY THIS EVENING.  STAY TUNED TO NOAA WEATHER RADIO AND OTHER
LOCAL MEDIA OUTLETS FOR FURTHER DETAILS OR UPDATES.

KEIGHTON

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
1215 PM EDT SAT JUL 19 2003

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0925 PM    NEW CANTON                VA   WIND DAMAGE
07/18/03   BUCKINGHAM                     SEVERAL TREES DOWN ON
                                          ROUTE 670. REPORTED
                                          BY BUCKINGHAM SHERIFFS
                                          OFFICE.

0935 PM    8NE DILLWYN               VA   WIND DAMAGE
07/18/03   BUCKINGHAM                     TREE DOWN ON ROUTE 622
                                          EAST OF ROUTE 15.
                                          REPORTED BY BUCKINGHAM
                                          SHERIFFS OFFICE.

NCZ003>006-019-020-VAZ016-017-032-043-044-058-192100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
213 PM EDT SAT JUL 19 2003

...STRONG THUNDERSTORMS IN THE AREA...
SCATTERED STRONG THUNDERSTORMS HAVE DEVELOPED IN SOUTHWEST VIRGINIA
AND NORTHWEST NORTH CAROLINA...AND ARE MOVING SOUTHEAST AT AROUND
20 MPH. SCATTERED STORMS WILL ALSO DEVELOP AND MOVE THROUGH
SOUTHSIDE VIRGINIA AND THE NORTHWEST PIEDMONT OF NORTH CAROLINA
LATER THIS AFTERNOON. PEOPLE IN THE PATH OF THESE STORMS CAN EXPECT
FREQUENT DANGEROUS LIGHTNING STRIKES...WIND GUSTS TO 40 MPH...BRIEF
HEAVY DOWNPOURS...AND POSSIBLY SOME SMALL HAIL. A FEW OF THE STORM
MAY STRENGTHEN ENOUGH TO PRODUCE DAMAGING WINDS...OR PENNY SIZED
OR LARGER HAIL.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR
FURTHER STATEMENTS OR POSSIBLE WARNINGS.

JJ