AREA FORECAST DISCUSSION
NWS BALTIMORE MD/WASHINGTON DC
AFDLWX 950 PM EST MON MAR 14 2005
.UPDATE:
WATER VAPOR LOOP SHOWS AN UPPER LOW RETROGRADING NORTHWEST ACROSS
CENTRAL CANADA...WHILE A TROUGH IS CARVED ACROSS THE WESTERN
CONUS...WITH ZONAL FLOW ALOFT ACROSS THE EASTERN TWO THIRDS OF THE
CONUS. SEVERAL WEAK WAVES ARE EMBEDDED IN THE MEAN FLOW JUST TO OUR
NORTH...WHILE A PAIR OF STRONGER WAVES ROTATE OVER SOUTHERN
CALIFORNIA AND OFF THE WESTERN MEXICO WATERS. 400-250MB WIND
OBSERVATIONS REVEAL A 120-140KT JET EXTENDS EAST FROM THE CENTRAL
ROCKIES THROUGH THE NORTHERN MID ATLANTIC REGION...WHILE A 130-150KT
JET EXTENDS ACROSS THE GULF OF MEXICO COAST INTO THE WESTERN
ATLANTIC. 19Z SURFACE ANALYSIS SHOWS A WEAK COLD FRONT PUSHING
THROUGH THE FORECAST AREA FROM THE NORTH...WHILE A 1015MB
ANTICYCLONE DOMINATES THE SOUTHERN MID ATLANTIC REGION. A FRONTAL
BOUNDARY HAS SAGGED SOUTH INTO THE GULF OF MEXICO...WHILE ANOTHER
BOUNDARY NEARLY PARALLELS THE CANADIAN BORDER.
NO MAJOR CHANGES PLANNED WITH THE EVENING UPDATE. SKIES ARE
GENERALLY CLEAR ACROSS THE REGION...WITH THE EXCEPTION OF SOME
STRATO CU SOUTH OF CHARLOTTESVILLE WHICH WILL CONTINUE TO FLATTEN
OUT AND DISSIPATE WITH THE LOSS OF DIURNAL HEATING. A FEW UPPER
LEVEL CLOUDS MAY STREAM ACROSS THE REGION WITH THE UPPER LEVEL JET
AXIS OVERHEAD. LARGE AREA OF STRATUS ACROSS THE LOWER GREAT LAKES
REGION SHOULD ONLY SLOWLY PROGRESS EAST-SOUTHEAST...BEFORE WARM
ADVECTION BEGINS TO ERODE THESE TUESDAY.
WINDS DID BECOME GUSTY THIS EVENING WITH THE PASSAGE OF A WEAK COLD
FRONT FROM NORTH TO SOUTH. HOWEVER...GRADIENT IS LOOSE ENOUGH ACROSS
THE MAJORITY OF THE FORECAST AREA TO ALLOW DECOUPLING. EXPECTING ANY
WIND GUSTS AROUND 15 MPH OVERNIGHT TO BE VERY OCCSIONAL AND ACROSS
THE NORTHEAST FORECAST AREA WHERE THE GRADIENT IS THE TIGHTEST.
ONLY MADE A FEW TEMPERATURE TWEAKS. UPDATED PRODUCTS OUT SHORTLY!
&&
.AVIATION: NO VISIBILITY OR CEILING RESTRICTIONS ANTICIPATED THROUGH
THE CURRENT VALID TAF CYCLE. A WEAK COLD FRONT PASSED THROUGH THE
TAF SITES THIS EVENING. NORTHWEST WINDS WILL OCCASIONALLY GUST TO
AROUND 15KT ACROSS BWI/DCA/MTN WHERE THE PRESSURE GRADIENT IS THE
TIGHTEST. DECOUPLING HAS OCCURED AT KCHO...WHILE WINDS WILL BE
SUSTAINED BUT NOT AS GUSTY NEAR KMRB/KIAD WHERE THE GRADIENT IS NOT
AS TIGHT.
&&
.MARINE: WINDS HAVE SLACKENED WITH THE LOSS OF DIURNAL HEATING
ACROSS THE WATERS...SO HAVE LOWERED THE SMALL CRAFT ADVISORY. 18Z
NAM/GFS BUFKIT FORECAST SOUNDINGS FOR ADJACENT LAND SITES DO SHOW
WIND GUST POTENTIAL IN THE 15 TO 20 KT RANGE...HOWEVER THESE ARE NOT
BEING REALIZED. KIAD EVENING ACARS AND 00Z RAOB DATA SUGGEST THAT
THE MODELS ARE TOO STORNG WITH THE WINDS WITHIN THE MIXED
LAYER...WHILE THE PRESSURE GRADIENT IS EXPECTED TO REMAIN NEARLY
CONSTANT OVERNIGHT AND TUESDAY.
WATER LEVELS ARE CURRENTLY RUNNING A HALF FOOT OR LESS ABOVE
PREDICTED VALUES.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE
MD...NONE
VA...NONE
WV...NONE
MARINE...NONE.
&&
$$
SHORT TERM/AVIATION/MARINE FORECASTER: ROGOWSKI
AREA FORECAST DISCUSSION
NWS CLEVELAND OHIO
AFDCLE 1231 PM EST MON MAR 14 2005
.AVIATION (18Z-18Z)...
WEAK SURFACE TROUGH ACROSS THE WESTERN GREAT LAKES NOW INTO NW
INDIANA. MID LEVEL DECK WITH BASE OF 7-8K AHEAD OF TROUGH NOW INTO
WRN OHIO. THE MID LEVEL DECK WILL SPREAD EAST ACROSS NORTHERN OHIO
BY LATE THIS EVENING BUT SHOULD ERODE SOME AS IT MOVES INTO THE
DRIER AIR. DONT EXPECT ANY WEATHER ASSOCIATED WITH THE TROUGH.
WILL GET CLEARING BEHIND TROUGH...WHICH SHOULD MOVE EAST OF AREA
TOWARD MIDNIGHT. SECOND TROUGH WILL MOVE THROUGH GREAT LAKES
TOMORROW WITH VFR/MVFR CLOUDS SPREADING INTO NW OHIO WEDNESDAY
MORNING.
&&
.SHORT TERM (THIS AFTERNOON) UPDATE...
LOW CLDS OVER THE EASTERN AREAS E OF CLE TO HZY...YNG...ERI AND
GKJ...WILL CONTINUE TO LIFT OUT DURING THE REST OF THE MORNING AND
EARLY AFTERNOON. WHILE THE MID LEVEL CLOUDS WILL MOVE IN FROM THE
WEST. TAMDAR DATA FROM THE TOL AND CLE AREAS INDICATING HIGHS LOWER
30S AND THE WINDS WERE BECOMING MORE WESTERLY 4000-5000 FEET ABOVE
THE SFC. SFC RIDGE FROM MID MISS VALLEY TO THE LOCAL AREA. LOW
PRESSURE AND TROF WISCONSIN TO NORTHERN ILLINOIS WAS MOVING EAST.
.SHORT TERM (TODAY) UPDATE...
SOME LAKE EFFECT CLDS MOVG INTO NE OH...THIS MAKE SENSE AS H8 AND
LAKE TEMP DIF NR 12Z AND N2 FLOW FOR A FEW HOURS THIS AM...CLDS MAY
DCR ERN PTN OF FA AND THEN MID CLDS OVR IN MAY MOV IN.
&&
.SHORT TERM (TDA THRU WED NIGHT)
HI PRES CENTERED OVR THE WRN END OF LERI HAS KEPT SKIES CLR AND
ALLOWED FOR JAN LIKE TEMPS THIS AM. LATEST STLT SHOWG JUST A COUPLE
PATCHES OF CLDS FLOATING ACRS THE AREA. SUM OF THESE VSBL FM OUR
ROOF THIS AM. UPSTREAM...AREA OF MID LVL CLDS JUST MOVG OVR LKMI.
THESE CLOUDS SHOULD EVENTUALLY MAKE IT OVR FA LATER TDA BUT MOST
AREAS SHOULD START OFF SUNNY. DO EXCPT MID CLDS TO DSIPT SOMEWHAT
AS THEY BUMP INTO HIGH. QUIET WX WL CONT TONIGHT. BOTH 00Z GFS AND
NAM SHOWG SUM INCRG MOIST LATE WED. A WEAK WAVE WL ROTATE THRU SO
WL KEEP MENTION OF FLURRIES GOING TO THE E OF KCLE FOR TMRW NGT.
OTHR THAN THAT SHOULD BE DRY FOR THE NXT FEW DAYS WHICH IS BAD NEWS
FOR THOSE WAITING FOR CLE TO BREAK IT/S ALL TIME SEASONAL SNOWFALL
RECORD.
FOR WED...HI PRES WL RMN JUST TO THE N KEEPG AREA UNDER INFLUENCE OF
DRY ELY FLOW. BOTH NAM AND GFS SWEEP INVER TROF ACRS LWR OH VLY WED
INTO WED NGT. BUT HIGH SHOULD KEEP PRECIP AT BAY TO THE S WHICH
AGREES WITH BOTH MODEL PROGS.
TEMPS WL RMN WELL BLO FOR MOST OF THE WEEK. LOOKS LIKE SPRING WL
HAVE TO WAIT FOR AT LEAST ANOTHER WEEK.
&&
.LONG TERM (THU THRU SUN)...
EXTENDED MODELS STILL NOT IN TOTAL AGREEMENT ON TIMING OF WEATHER
SYSTEMS BUT ALL DO AGREE ON A GENERAL WARMING TREND AS LW RIDGE
TRIES TO BUILD INTO THE EAST. LOW MOVES ACROSS OHIO VALLEY
WEDNESDAY...BUT TIMING AND TRACK VARY GREATLY. GFL HAS LOW TRACKING
INTO KY WHILE THE EST KEEPS LOW IN CENTRAL GA. AS STRONG AS THE HIGH
IS OVER LOWER LAKES...ETA SOLUTION SEEMS MORE REASONABLE. ETA DROPS
SHORTWAVE ACROSS LOWER LAKES THRUSDAY...WHICH IS LINE WITH CURRENT
FORECAST SO MADE FEW CHANGES TO THURSDAYS FORECAST. EXMWF MOVES
ANOTHER INVERTED TROUGH ACROSS OHIO VALLEY FRIDAY BUT GFSLR AND DGEX
KEEPS HIGH PRESS OVER AREA SO KEPT FRIDAY DRY.
HIGH PRESSURE REMAINS OVER AREA NEXT WEEKEND...MOS WARMS TEMPS IN
THE MID TO UPPER 40S FOR NEXT WEEKEND...BUT WITH STRONG NLY FLO AND
CURRENT SNOW PACK I UNDERCUT MOS BY A SEVERAL DEGREES.
&&
.CLE WATCHES/WARNINGS/ADVISORIES...
.OH...NONE.
.PA...NONE.
&&
SHORT TERM...THOMPSON/KUBINA
LONG TERM...DJB
AVIATION...DJB
$$
AREA FORECAST DISCUSSION
NWS CLEVELAND OHIO
AFDCLE 1230 PM EST MON MAR 14 2005
.AVIATION (12Z-12Z)...
WEAK SURFACE TROUGH ACROSS THE WESTERN GREAT LAKES NOW INTO NW
INDIANA. MID LEVEL DECK WITH BASE OF 7-8K AHEAD OF TROUGH NOW INTO
WRN OHIO. THE MID LEVEL DECK WILL SPREAD EAST ACROSS NORTHERN OHIO
BY LATE THIS EVENING BUT SHOULD ERODE SOME AS IT MOVES INTO THE
DRIER AIR. DONT EXPECT ANY WEATHER ASSOCIATED WITH THE TROUGH.
WILL GET CLEARING BEHIND TROUGH...WHICH SHOULD MOVE EAST OF AREA
TOWARD MIDNIGHT. SECOND TROUGH WILL MOVE THROUGH GREAT LAKES
TOMORROW WITH VFR/MVFR CLOUDS SPREADING INTO NW OHIO WEDNESDAY
MORNING.
&&
.SHORT TERM (THIS AFTERNOON) UPDATE...
LOW CLDS OVER THE EASTERN AREAS E OF CLE TO HZY...YNG...ERI AND
GKJ...WILL CONTINUE TO LIFT OUT DURING THE REST OF THE MORNING AND
EARLY AFTERNOON. WHILE THE MID LEVEL CLOUDS WILL MOVE IN FROM THE
WEST. TAMDAR DATA FROM THE TOL AND CLE AREAS INDICATING HIGHS LOWER
30S AND THE WINDS WERE BECOMING MORE WESTERLY 4000-5000 FEET ABOVE
THE SFC. SFC RIDGE FROM MID MISS VALLEY TO THE LOCAL AREA. LOW
PRESSURE AND TROF WISCONSIN TO NORTHERN ILLINOIS WAS MOVING EAST.
.SHORT TERM (TODAY) UPDATE...
SOME LAKE EFFECT CLDS MOVG INTO NE OH...THIS MAKE SENSE AS H8 AND
LAKE TEMP DIF NR 12Z AND N2 FLOW FOR A FEW HOURS THIS AM...CLDS MAY
DCR ERN PTN OF FA AND THEN MID CLDS OVR IN MAY MOV IN.
&&
.SHORT TERM (TDA THRU WED NIGHT)
HI PRES CENTERED OVR THE WRN END OF LERI HAS KEPT SKIES CLR AND
ALLOWED FOR JAN LIKE TEMPS THIS AM. LATEST STLT SHOWG JUST A COUPLE
PATCHES OF CLDS FLOATING ACRS THE AREA. SUM OF THESE VSBL FM OUR
ROOF THIS AM. UPSTREAM...AREA OF MID LVL CLDS JUST MOVG OVR LKMI.
THESE CLOUDS SHOULD EVENTUALLY MAKE IT OVR FA LATER TDA BUT MOST
AREAS SHOULD START OFF SUNNY. DO EXCPT MID CLDS TO DSIPT SOMEWHAT
AS THEY BUMP INTO HIGH. QUIET WX WL CONT TONIGHT. BOTH 00Z GFS AND
NAM SHOWG SUM INCRG MOIST LATE WED. A WEAK WAVE WL ROTATE THRU SO
WL KEEP MENTION OF FLURRIES GOING TO THE E OF KCLE FOR TMRW NGT.
OTHR THAN THAT SHOULD BE DRY FOR THE NXT FEW DAYS WHICH IS BAD NEWS
FOR THOSE WAITING FOR CLE TO BREAK IT/S ALL TIME SEASONAL SNOWFALL
RECORD.
FOR WED...HI PRES WL RMN JUST TO THE N KEEPG AREA UNDER INFLUENCE OF
DRY ELY FLOW. BOTH NAM AND GFS SWEEP INVER TROF ACRS LWR OH VLY WED
INTO WED NGT. BUT HIGH SHOULD KEEP PRECIP AT BAY TO THE S WHICH
AGREES WITH BOTH MODEL PROGS.
TEMPS WL RMN WELL BLO FOR MOST OF THE WEEK. LOOKS LIKE SPRING WL
HAVE TO WAIT FOR AT LEAST ANOTHER WEEK.
&&
.LONG TERM (THU THRU SUN)...
EXTENDED MODELS STILL NOT IN TOTAL AGREEMENT ON TIMING OF WEATHER
SYSTEMS BUT ALL DO AGREE ON A GENERAL WARMING TREND AS LW RIDGE
TRIES TO BUILD INTO THE EAST. LOW MOVES ACROSS OHIO VALLEY
WEDNESDAY...BUT TIMING AND TRACK VARY GREATLY. GFL HAS LOW TRACKING
INTO KY WHILE THE EST KEEPS LOW IN CENTRAL GA. AS STRONG AS THE HIGH
IS OVER LOWER LAKES...ETA SOLUTION SEEMS MORE REASONABLE. ETA DROPS
SHORTWAVE ACROSS LOWER LAKES THRUSDAY...WHICH IS LINE WITH CURRENT
FORECAST SO MADE FEW CHANGES TO THURSDAYS FORECAST. EXMWF MOVES
ANOTHER INVERTED TROUGH ACROSS OHIO VALLEY FRIDAY BUT GFSLR AND DGEX
KEEPS HIGH PRESS OVER AREA SO KEPT FRIDAY DRY.
HIGH PRESSURE REMAINS OVER AREA NEXT WEEKEND...MOS WARMS TEMPS IN
THE MID TO UPPER 40S FOR NEXT WEEKEND...BUT WITH STRONG NLY FLO AND
CURRENT SNOW PACK I UNDERCUT MOS BY A SEVERAL DEGREES.
&&
.CLE WATCHES/WARNINGS/ADVISORIES...
.OH...NONE.
.PA...NONE.
&&
SHORT TERM...THOMPSON/KUBINA
LONG TERM...DJB
AVIATION...DJB
$$