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9.21-9.23(+?) rain event


Ian

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that's mitch's "line" though. what about the last month? the pattern wont stay the same thru winter either.

But...it's such a good line. It is simple in its consistency, nuance be damned.

(Look at model runs with heavy precip on the coast too easily picks at the scab of 12/26/10, but, yes, I was being tongue-in-cheek generally)

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post-1615-0-50357300-1316646331.gif

THE GUIDANCE PLACES MUCH OF THE ERN SEABOARD IN A REGIME OF DEEP LYR SRLY FLOW...WITH THE REGION CAUGHT IN BETWEEN THE UPR LOW OVER THE GREAT LAKES REGION AND THE STG ATLANTIC SUBTROPICAL RIDGE OFF THE EAST COAST. DEEP LYR ASCENT IS PROGGED TO INCREASE WITH TIME GIVEN DEVELOPMENT OF H25 RRQ JET DYNAMICS...WITH FORCING FURTHER AIDED BY EMBEDDED SHRTWV IMPULSES CAUGHT UP IN THE DEEP MEAN SRLY FLOW. WITH THE EXCEPTION OF THE 12Z NAM...THE MDL CONSENSUS SUPPORTS AT LEAST ONE SFC WAVE DEVELOPING OVER THE MID-ATLANTIC COASTAL PLAIN BY MIDDAY FRI. THIS WAVE LIFTS NNEWD THROUGH NEW ENGLAND BY EARLY SAT...ONLY TO BE FOLLOWED BY A NEW WAVE OF DEVELOPING OVER THE MID-ATLANTIC COASTAL PLAIN THAT WILL ALSO TRACK INTO SRN NEW ENGLAND BY LATE SAT. ALL THE WHILE...DEEP TROPICAL MSTR WITH PWATS AOA 2 INCHES SHOULD BE TRANSPORTED NWD INTO THIS STREAM OF DEEP SRLY FLOW...WITH THE SYNOPTIC ENVIRONMENT CONDUCIVE FOR AN ATMOSPHERIC RIVER OF TROPICAL MSTR/HIGH PWATS THAT SHOULD EXTEND NWD FROM THE SWRN TROPICAL ATLANTIC NWD UP ALONG THE COASTAL PLAIN OF THE ERN SEABOARD. HENCE...EXPECT A WIDESPREAD THREAT OF MDT TO HVY RAINS...WITH LOCALIZED AREAS OF EXCESSIVE RAINFALL EXPECTED ESP EAST OF THE APPALACHIANS...BUT INCLUSIVE OF THE FOOTHILLS...PIEDMONT AND COASTAL PLAIN ALONG THE ERN SEABOARD. RAINFALL AMTS ARE EXPECTED TO BE OROGRAPHICALLY ENHANCED LOCALLY. TWO-DAY RAINFALL TOTALS ENDING 00Z/SUN OF 2 TO 4 INCHES ARE EXPECTED...WITH ISOLATED AMTS EXCEEDING 5 INCHES LOCALLY. HPC QPF FAVORED A NON-NAM CONSENSUS SOLN.

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The guidance looks much less impressive than yesterday as the upper low never gets south of us. I got more than 40 drops while fishing. I had to put on rain gear for 15 minutes or so down on Mattawoman Creek.

I havent paid that much attention to specifics I guess. HPC numbers have gone up though I think.

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I'll admit, I haven't been following this event too much. So, here comes a weenie IMBY question - I'll be in Gettysburg, PA tomorrow and Chambersburg, PA on Saturday... will my day trip tomorrow be ruined? I think (from what I have seen) it looks like most of the heavier stuff will remain east, so I may be on the western fringe of it.

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up north of here hpc took away like 5" of rain with the new update

It's still pretty much up in the air. one difference is the gfs no longer closes off a low to our south so there is no strong surface wave to pump moisture into the stationary front. That doesn't mean there willbe no heavy rain just that the potential for widespread heavy rain is less and any real heavy rain would be more localized. However, I noticed that in the longer range the euro does dig the upper low southeast and gets it south of our latitude which would complicate the forecast. Luckily, I no longer do QPF for living. It's hard enough in the day 1 and 2 time ranges. Out to day 5 its really even more of a pull it out of your nether regions deal.

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yay :arrowhead:

FLOOD WATCH

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

1144 AM EDT THU SEP 22 2011

DCZ001-MDZ004>007-009>011-013-014-016-VAZ042-052>055-222345-

/O.NEW.KLWX.FF.A.0018.110923T1000Z-110923T2200Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

DISTRICT OF COLUMBIA-FREDERICK MD-CARROLL-NORTHERN BALTIMORE-

HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-PRINCE GEORGES-

ANNE ARUNDEL-CHARLES-LOUDOUN-

PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-

ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-

INCLUDING THE CITIES OF...WASHINGTON...FREDERICK...WESTMINSTER...

GAITHERSBURG...COLUMBIA...BALTIMORE...ANNAPOLIS...WALDORF...

LEESBURG...MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...

FALLS CHURCH

1144 AM EDT THU SEP 22 2011

...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY

AFTERNOON...

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF MARYLAND...THE DISTRICT OF

COLUMBIA AND NORTHERN VIRGINIA...INCLUDING THE FOLLOWING

AREAS...IN MARYLAND...ANNE ARUNDEL...CARROLL...CHARLES...

FREDERICK MD...HARFORD...HOWARD...MONTGOMERY...NORTHERN

BALTIMORE...PRINCE GEORGES AND SOUTHERN BALTIMORE. THE

DISTRICT OF COLUMBIA. IN NORTHERN VIRGINIA...ARLINGTON/FALLS

CHURCH/ALEXANDRIA...FAIRFAX...LOUDOUN...PRINCE

WILLIAM/MANASSAS/MANASSAS PARK AND STAFFORD.

* FROM FRIDAY MORNING THROUGH FRIDAY AFTERNOON

* PERIODS OF HEAVY RAIN ARE EXPECTED TO FALL BEGINNING LATE

TONIGHT...THE HEAVIEST OF WHICH MAY FALL IN THE VICINITY OF THE

I-95 CORRIDOR. RAINFALL AMOUNTS OF AROUND 2 INCHES IN 3 HOURS

WOULD LIKELY BE ENOUGH TO TRIGGER FLASH FLOODING.

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From the 0600 Day 2 SPC OTLK

...CAROLINAS TO DELMARVA...

IT IS TOO EARLY TO INTRODUCE EVEN LOW-END SEVERE WEATHER

PROBABILITIES OVER THESE AREAS GIVEN THE GREAT AMOUNT OF UNCERTAINTY

ABOUT AIR MASS DESTABILIZATION AND THE EVOLUTION OF POSSIBLE

MESOSCALE FEATURES THAT COULD SUPPORT MORE ORGANIZED STORMS.

SEVERE/ISOLATED TORNADO POTENTIAL WILL DEPEND ON THE DEVELOPMENT OF

SEVERAL INFLUENCES THAT ARE ONLY MARGINALLY SUPPORTED IN LATEST

GUIDANCE. THERE IS RELATIVELY HIGH CONFIDENCE THAT A VERY MOIST BUT

GENERALLY LOW-CAPE AIR MASS WILL BE SITUATED ACROSS THE MID-ATLANTIC

REGION. IF POCKETS OF GREATER SURFACE-HEATING CAN DEVELOP...LOCALLY

GREATER DESTABILIZATION MAY BE REALIZED. FURTHERMORE...THERE ARE A

WIDE RANGE OF POSSIBLE SURFACE DEVELOPMENT SCENARIOS BEING DEPICTED

IN LATEST GUIDANCE. IT SEEMS REASONABLE TO EXPECT WEAK SURFACE WAVE

DEVELOPMENT ALONG THE COASTAL PLAIN...OR PERHAPS ALONG THE IMMEDIATE

COAST...BY LATE FRIDAY NIGHT THROUGH EARLY SATURDAY. ANY SUCH

DEVELOPMENT COULD LOCALLY ENHANCE LOW LEVEL SHEAR AND...IN THE

PRESENCE OF STRONGER CONVECTION...SUPPORT THE CHANCE FOR AN ISOLATED

TORNADO EVENT. HOWEVER...DEGREE OF UNCERTAINTY SUGGESTS IT WOULD BE

PRUDENT TO REFRAIN FROM OVER FORECASTING THIS LOW-POTENTIAL SCENARIO

AT THIS TIME.

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yay :arrowhead:

FLOOD WATCH

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

1144 AM EDT THU SEP 22 2011

DCZ001-MDZ004>007-009>011-013-014-016-VAZ042-052>055-222345-

/O.NEW.KLWX.FF.A.0018.110923T1000Z-110923T2200Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

DISTRICT OF COLUMBIA-FREDERICK MD-CARROLL-NORTHERN BALTIMORE-

HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-PRINCE GEORGES-

ANNE ARUNDEL-CHARLES-LOUDOUN-

PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-

ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-

INCLUDING THE CITIES OF...WASHINGTON...FREDERICK...WESTMINSTER...

GAITHERSBURG...COLUMBIA...BALTIMORE...ANNAPOLIS...WALDORF...

LEESBURG...MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...

FALLS CHURCH

1144 AM EDT THU SEP 22 2011

...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY

AFTERNOON...

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF MARYLAND...THE DISTRICT OF

COLUMBIA AND NORTHERN VIRGINIA...INCLUDING THE FOLLOWING

AREAS...IN MARYLAND...ANNE ARUNDEL...CARROLL...CHARLES...

FREDERICK MD...HARFORD...HOWARD...MONTGOMERY...NORTHERN

BALTIMORE...PRINCE GEORGES AND SOUTHERN BALTIMORE. THE

DISTRICT OF COLUMBIA. IN NORTHERN VIRGINIA...ARLINGTON/FALLS

CHURCH/ALEXANDRIA...FAIRFAX...LOUDOUN...PRINCE

WILLIAM/MANASSAS/MANASSAS PARK AND STAFFORD.

* FROM FRIDAY MORNING THROUGH FRIDAY AFTERNOON

* PERIODS OF HEAVY RAIN ARE EXPECTED TO FALL BEGINNING LATE

TONIGHT...THE HEAVIEST OF WHICH MAY FALL IN THE VICINITY OF THE

I-95 CORRIDOR. RAINFALL AMOUNTS OF AROUND 2 INCHES IN 3 HOURS

WOULD LIKELY BE ENOUGH TO TRIGGER FLASH FLOODING.

I'm not surprised, still lots of water in the ground so it wouldn't take much to have some streams overflow.

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Funny, actually not, how the "sunny" days forecast keeps getting pushed into the future. Started the week, Sunday I think, with this upcoming weekend looking pretty good. IIRC, this Sunday's forecast was to be sunny and nice temps. Now the next "sunny" day forecast is next Thursday.

Maybe they should just go with.....there will be another clear day in the future, we're just not sure when.:P

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Funny, actually not, how the "sunny" days forecast keeps getting pushed into the future. Started the week, Sunday I think, with this upcoming weekend looking pretty good. IIRC, this Sunday's forecast was to be sunny and nice temps. Now the next "sunny" day forecast is next Thursday.

Maybe they should just go with.....there will be another clear day in the future, we're just not sure when.:P

good sunset weather.. saw it but was not in a great spot and only had cell. this shot is sweet tho

http://t.co/X10DFo46

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