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Heavy Rain Threat - 10/28-29


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Latest from MT Holly NWS.

 

 

WEDNESDAY AND WEDNESDAY NIGHT...PRETTY MUCH A WASHOUT OF A DAY WITH
HEAVY RAIN POTENTIAL. THE MODELS HAVE COME TO CLOSER TIMING
AGREEMENT AND EVEN A BETTER LOCATION AGREEMENT. A SERLY LLVL AND
LOCATION OF THE BEST FGEN FORCING AND MID LEVEL QVEC CONVERGENCE ARE
ALL CENTERING ON UPSLOPE AREAS OF OUR CWA FAVORING LOCATIONS FROM
THE FALL LINE NORTHWESTWARD AS THE MOST PRONE AREAS FOR HEAVY
RAIN. ON TOP OF THIS THERE IS VIGOROUS ISENTROPIC LIFT DEPICTED AT
300K (NOW 100-150MB) THROUGHOUT OUR CWA DURING THE DAY AS WELL AS
THE WHOLE 500MB FLOW TAKING A NEG TILT LOOK. WE KEYED THE LONGEST
DURATION MENTION OF HEAVY RAIN IN THESE NW AREAS. AS WEDNESDAY
DAY PROGRESSES INSTABILITY ALOFT IS PROGGED TO MOVE INTO OUR CWA
AND THIS WOULD SPREAD THE HEAVY RAIN POTENTIAL THRUT OUR CWA.
WHILE THE HEAVY RAIN REMAINS OUR MOST LIKELY IMPACT, BOTH THE GFS
AND WRF-NMMB ARE NOW PREDICTING SOME SURFACE BASED CAPE AS THE
COLD FRONT APPROACHES WEDNESDAY EVENING/NIGHT. STRONG
UNIDIRECTIONAL WINDS WOULD SUPPORT THE FORMATION OF A NCFRB OR
MAYBE AN OUTRIGHT LINE OF GUSTY SHOWERS/THUNDERSTORMS.

EVENT PRECIPITATION TOTALS SHOULD AVERAGE 1 TO 3 INCHES. WE HAVE
BEEN SO DRY THE LAST TWO WEEKS THAT CURRENTLY NONE OF THE GEFS/NAEFS
OR SREF MMEFS MEMBERS HAVE ANY OF OUR GAGED RIVERS AND CREEKS
GETTING TO CAUTION STAGE.

THURSDAY...IF THE GULF COAST SYSTEM DID NOT GET RAPIDLY SHEARED, WE
WOULD HAVE HAD A COMPLETE TRIPLE PHASE. AS IT IS THE PACIFIC TROF
WILL PHASE WITH ENERGY OVER NORTHWEST CANADA BY EARLY THURSDAY. EVEN
PRECEDING THIS, A PIECE OF THE GULF COAST LOW GETS ABSORBED INTO
THIS PROCESS AND A SURFACE LOW WILL DEEPEN RAPIDLY AS IT MOVES
ACROSS THE GREAT LAKES AND A 500MB CLOSED LOW IS PREDICTED TO
INTENSIFY TO SUB 520DM. THIS WILL BE THE ULTIMATE DRIVER OF PUSHING
THE INITIAL FRONT THROUGH EARLY THURSDAY. BUT SINCE THE CLOSED LOW
IS LIFTING TO THE NORTHWEST OF ERIE AND ONTARIO AND A SOUTHWEST FLOW
ALOFT RETURNS BRIEFLY ON THURSDAY THE IDEA OF A SECONDARY COLD
FRONTAL PASSAGE IS GAINING TRACTION. THERE IS STRONG DPVA PREDICTED
TO PASS THROUGH. THERE ARE LATITUDINAL DIFFERENCES AND AT THIS
POINT WE IGNORE MODEL MEAN RH FORECASTS AS THEY ARE LESS SKILLFUL
THAN 500MB PROJECTIONS. WE HAVE KEPT IN THE CHANCE OF SHOWERS WITH
HIGHEST POPS NORTH CLOSER TO MODEL DPVA CONSENSUS. GIVEN THAT THE
FLOW ALOFT BECOMES SOUTHWEST AGAIN, THE "REAL" COOL AIR WILL LIKELY
HAVE TO WAIT FOR THE SECONDARY CFP AND THE DAY (LIKE WEDNESDAY)
WILL BE MILDER THAN NORMAL FOR LATE OCTOBER.
 

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We need to the rain to give the plants/trees one last drink before hybernation. I have never needed to water mums before as it usually consistently wet this time of year and evaporation rates are way down. But the mums on campus look like crap. And this is the heart of Manhattan so we haven't been close to frost.

As far as winds looks to be a run of the mill windy day. The squall line appears to be the only hope for something interesting aka above 40mph. Bye bye leaves regardless

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How many times are misinformed posters going to call bust before the forecasted start of an event?

 

The heaviest rains were always forecasted to arrive after 18z and a good chunk will probably wait until after 00z if the HRRR has the correct idea. 

 

Upton isn't giving up on their thoughts of how this storm plays out either; the latest forecast map has actually seen the projected rainfall tick up a bit...through 2pm Thursday, 10/29:

 

 Created: 10/28/15 9:53 AM EDT StormTotalQPFFcst.png

 

 

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How many times are misinformed posters going to call bust before the forecasted start of an event?

 

The heaviest rains were always forecasted to arrive after 18z and a good chunk will probably wait until after 00z if the HRRR has the correct idea. 

 

Always happens.

 

How much are the latest HRRR runs showing? And RGEM?

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