Flash Flood Warning 109, NWS Baltimore/Washington

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
212 PM EDT FRI AUG 22 2003

.SHORT TERM...TONIGHT AND SATURDAY...
THIS AFTERNOON AND EVENING EXPECTING SHOWERS AND THUNDERSTORMS TO
CONTINUE TO DEVELOP AND INCREASE ALONG AND AHEAD OF THE COLD FRONT.
GOOD INSTABILITY OVR THE REGION WI SBCAPES OVR 3000 J/KG AND LIS
OVR -6 BY THIS AFTERNOON/EVENING. THAT COMBINE WITH THE A SFC FRONT
AND ASSOC 500MB SHORT WAVE AND PLENTY OF MOISTURE (PWS ABOUT 1.6
THIS MORNING) SHOULD HAVE SOME STRONG TO SEVERE STORMS. THE MAIN NEG
POINTS ARE THE MID LEVEL CAP (WHICH SHOULD WEAKEN) AND THE WEAK
UNIDIRECTIONAL WIND PROF FROM THE WEST. OVERALL...LONG WAVE UPR TROF
OVER THE EAST WILL AMPLIFY AND PROGRESS EAST INTO THE WESTERN
ATLANTIC. THAT WILL HELP MOVE THE SFC COLD FRONT THRU THE REGION
TONIGHT WITH GOOD CAA BEHIND THE FRONT WITH SIGNIFICANTLY COOLER AND
DRIER CONDITIONS BEHIND IT FOR THE WEEKEND. ND

.LONG TERM...SAT NGT AND BEYOND...
DRIER AIR STILL ON SKED AS CANADIAN RIDGE PUSHES S THRU THE GTLKS.
AMS ASSOC WITH THIS HIGH IS VRY DRY...AND PLAN ON KEEPING
MSUNNY/SUNNY CONDS BY SAT NGT THRU SUN.

MED RANGE MDLS IN GOOD AGRMT TODAY. STG UPR RIDGE OVR THE PLAINS
STATES TRIES TO STAND ITS GROUND DESPITE DECENT TROF SLAMMING INTO
THE PAC NW EARLY IN THE WK. ENSEMBLES STILL TRYING TO WORK OUT THE
DIFFERENCES WITH THE STRENGTH OF SYS MOVING INTO THE PAC NW EARLY IN
THE WK...BUT ALL REMAIN ON THE SAME PAGE THAT IT WL HAPPEN. NET
EFFECT IS THE SUBTROPICAL RIDGE BEING DEPRESSED FURTHER S WITH A
FLATTENING OF THE WESTERLIES OVR THE FAR NRN CONUS.

MODERATING TREND BEGINS EARLY IN THE WK AS HGHTS BUILD OVR THE SW
ATL AND NE TROF LIFTS OUT.

DESPITE DRY AMS THAT INITIALLY ACCOMPANIES THE RIDGE THIS
WKND...MORE GULF/TROPICAL MOISTURE BECOMES WRAPPED UP IN THE RIDGE
AS THE WEEK WEARS ON. THIS WL MEAN A RETURN OF HIGHER TDS AND A
GRADUAL WARMING TREND AS SWLY FLOW BECMS MORE ESTABLISHED.

NEXT SYS MOVING EWD TOWARD THE MID ATL FASTER THAN PREV RUNS...AND
WL INTRODUCE CHC POPS FOR WED/THU. THE FNT XPCTD TO STALL JUST S OF
THE AREA...BUT WL PLAY THE OPTIMISTIC SIDE AND KEEP MENTION OF PCPN
TO WED/THU.

TEMPS THIS WKND WL BE UNSEASONABLY COOL AS DRY AMS WORKS S. H8 TEMPS
DROP OFF TO AROUND +10-12C. ONLY XPCTG TEMPS TO BE IN THE L/M80S AT
BEST. COOL NIGHTS AND DRY WARM SUNNY DAYS STILL ON TAP FOR
SAT-MON...WITH WARMING TREND ENSUING THEREAFTER.

MANNING

.LWX...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...NONE.

DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042-
050>057-WVZ048>055-230900-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
900 AM EDT FRI AUG 22 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE CHESAPEAKE
BAY AND EAST OF GARRETT COUNTY...THE DISTRICT OF COLUMBIA...NORTHERN
VIRGINIA...THE NORTHERN AND CENTRAL SHENANDOAH VALLEY...AND THE
EASTERN PANHANDLE OF WEST VIRGINIA.

.DAY ONE...TODAY
A HEAT ADVISORY IS IN PLACE FOR TODAY EAST OF THE BLUE RIDGE
INCLUDING THE WASHINGTON AND BALTIMORE METRO AREAS. HEAT INDICES
ARE EXPECTED TO BE AROUND 100.

IN ADDITION...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS
MOST OF THE REGION THIS AFTERNOON AND TONIGHT. SOME OF THE STRONGER
STORMS MAY BE CAPABLE OF PRODUCING DAMAGING WINDS...HAIL...AND VERY
HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED LATER TODAY.

MDZ003-WVZ051-052-222115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
416 PM EDT FRI AUG 22 2003

AT 416 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
BERKELEY SPRINGS...MOVING EAST AT 10 MPH. THIS STORM WILL BE CAPABLE
OF PRODUCING SMALL HAIL...HEAVY DOWNPOURS...AND WIND GUSTS TO 50 MPH.
EMERGENCY MANAGERS REPORT WATER OVER THE ROADS IN BERKELEY SPRINGS.
THE COMMUNITY OF BERKELEY SPRINGS WILL BE AFFECTED BY THIS STORM
THROUGH 515 PM EDT.

ABW