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The Official 2014 Fall Discussion Thread


jburns

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The trolls will be busy this winter! The good ones that show up when everyone's in a snow frenzy and they highlight the JMA, that is the only model showing rain! Due to our constant snow threats, I expect troll overload this winter! The 6z GFS is obviously underestimating the weight/strength of the cold, duh! :)

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From GSP...

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...AS OF 205 PM EDT TUESDAY...MODEL TRENDS OVER THE PAST FEW DAYS HAVEBEEN TO SLOW THE SE PROGRESSION OF THE COLD FRONT THIS WEEKEND. THEFORECAST FOR THE WEEKEND HAS GONE FROM MOSTLY DRY A FEW DAYS AGO TOMOSTLY WET FOR THE CURRENT FORECAST.

 

 

They must be trolls underestimating the weight and strength of the cold. 

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From RAH, re: Long Term:

 

.LONG TERM /THURSDAY THROUGH TUESDAY/...
AS OF 210 PM TUESDAY...

...A WET AND COOLER PERIOD FOR THE WEEKEND...

THE MAIN FORECAST CHALLENGES FOR THE EXTENDED FORECAST CONTINUE
FOCUSED ON THE DEEPENING TROUGH THAT IS FORECAST THIS WEEKEND INTO
NEXT WEEK OVER THE EASTERN PART OF THE UNITED STATES. MODELS AND
ENSEMBLES HAVE CONTINUED TO TREND WETTER OVER THE SOUTHEASTERN
STATES EXTENDING NORTHWARD INTO THE MID-ATLANTIC REGION SATURDAY
INTO EARLY NEXT WEEK. WHILE THIS MAY TURN OUT TO BE ANOTHER VERY WET
PERIOD... THE OPERATIONAL EUROPEAN CONTINUES TO ADVERTISE 2-4 INCHES
OF RAIN
OVER THE ALREADY SATURATED EASTERN PIEDMONT AND COASTAL
PLAIN OF NC DURING THE FRIDAY THROUGH MONDAY TIME FRAME.
WE WILL NOT
TOTALLY BUY INTO THAT SOLUTION AS OF YET... HOWEVER THE LATEST
ENSEMBLE MEMBERS ARE DEFINITELY TRENDING TOWARD THE ASSOCIATED COLD
FRONT TO STALL SOMEWHERE OVER CENTRAL OR EASTERN NORTH CAROLINA
SATURDAY WITH A POTENTIAL WAVE ALONG THE FRONT THAT WOULD ENHANCE
RAINFALL SAT-SUN. THE FRONT THEN SHOULD SAG SOUTHWARD PLACING OUR
REGION IN A MOIST NE FLOW AND POTENTIALLY  OVERRUNNING RAINFALL LATER
SUNDAY INTO MONDAY. WE WILL TREND IN THE WETTER DIRECTION FOR THE
WEEKEND.

SENSIBLE WEATHER... WARM AND HUMID THURSDAY WITH A CHANCE OF
THUNDERSTORMS LATE IN THE NW. HIGHS 85-92. A GOOD CHANCE OF SHOWERS
AND THUNDERSTORMS THURSDAY NIGHT INTO FRIDAY NIGHT AND SATURDAY.
LOWS IN THE 60S. HIGHS IN THE 70S TO LOWER 80S SE. A CHANCE OF
SHOWERS OR RAIN INTO SUNDAY NIGHT AND MONDAY. MUCH COOLER. LOWS IN
THE MID 50S TO LOWER 60S. HIGHS UPPER 60S TO MID 70S EARLY NEXT
WEEK

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This is the time of the year for false cold front passages. In 2002, it took until mid October for it to feel like autumn. Last year, we didn't get out first fall push until the last week of September.

2002 was just horrible. It took forever to cool off. That's the latest I ever remember getting our first big cold front.

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Are there any thoughts on how or if the next front may interact with the disturbance near southern Florida which is predicted to move west into the Gulf of Mexico.  What's the liklihood that rain amounts this weekend for central and eastern NC may go up from what is being forcasted?

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Are there any thoughts on how or if the next front may interact with the disturbance near southern Florida which is predicted to move west into the Gulf of Mexico.  What's the liklihood that rain amounts this weekend for central and eastern NC may go up from what is being forcasted?

I think it matters on the actual development, movement, and then our frontal position. All are questionable at this point.  I think maybe if the euro is correct and the front does not drop south as much, and you have something move into the Gulf, then yes it could then be shunted back to the NE and increase precip. 

At this point I have no idea what will happen. I'm a little discouraged, I was really hoping for a nice cool (Fall like)Sunday; but it's looking more and more like the soggy times will continue.    

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So tired of the rain and the hot temps. This late surge of summer needs to end and we need some DRY fall days.

 

I think it matters on the actual development, movement, and then our frontal position. All are questionable at this point.  I think maybe if the euro is correct and the front does not drop south as much, and you have something move into the Gulf, then yes it could then be shunted back to the NE and increase precip. 

At this point I have no idea what will happen. I'm a little discouraged, I was really hoping for a nice cool (Fall like)Sunday; but it's looking more and more like the soggy times will continue.    

 

I don't know about you guys, but my NWS page shows highs in the 70s for all forecasted days beyond Thursday.  Sounds fall-like to me.

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I don't know about you guys, but my NWS page shows highs in the 70s for all forecasted days beyond Thursday.  Sounds fall-like to me.

That does look good and I really should not complain; but I'm greedy and I want that 72 degree, sunny/deep blue sky, breezy, and low humidly weekend day. A couple of days back Sunday was looking close to that.

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That does look good and I really should not complain; but I'm greedy and I want that 72 degree, sunny/deep blue sky, breezy, and low humidly weekend day. A couple of days back Sunday was looking close to that.

 

Gotcha.  I think you'll get your wish for Monday and following of next week.  But, those aren't weekend days...

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12 GFS shows the CAD setting up for this weekend. At hour 60 dew points should be in the 50s from RDU westward. At this point dew points will still be at or above 70 from the NC boarder southward. (but)As with many other CADs don't underestimate the ability of cool air to sink further south than modeled.

 

http://www.twisterdata.com/index.php?prog=forecast&model=GFS&grid=3&model_yyyy=2014&model_mm=09&model_dd=10&model_init_hh=12&fhour=60&parameter=DPTF&level=2&unit=M_ABOVE_GROUND&maximize=n&mode=singlemap&sounding=n&output=image&view=large&archive=false

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Here's the long term from RAH:

 

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
AS OF 255 PM WEDNESDAY...

A POTENTIALLY GRAY AND DAMP PATTERN MAY BE SHAPING UP FOR CENTRAL NC
DURING MUCH OF THE LONG TERM PERIOD A
S THE COLD FRONT CURRENTLY
EXTENDING FROM LOWER MI SW TO CENTRAL TX MOVES SOUTH AND WILL BE
LOCATED ACROSS EASTERN AND SOUTHERN PORTIONS OF NC BY 12Z FRIDAY.
THE FRONT WILL MOVE LITTLE FROM FRIDAY THROUGH SATURDAY GIVEN
PROLONGED SW FLOW ALOFT. MEANWHILE...MOISTURE WILL CONTINUE TO
STREAM NORTHWARD IN THE AFOREMENTIONED SW FLOW...INTERACTING AND
LIFTING OVER THE BOUNDARY AND SETTING THE STAGE FOR PERIODS OR
POCKETS OF RAIN FRIDAY AND SATURDAY. WHILE IT WON`T BE RAINING THE
ENTIRE TIME...THE ABUNDANT MOISTURE AS DEPICTED BY FORECAST PWAT
VALUES BETWEEN 2 AND 2.25 INCHES ACROSS OUR AREA SUGGEST THAT ANY OF
THE HEAVIER AND/OR PROLONGED DOWNPOURS MAY RESULT IN URBAN...SMALL
STREAM OR POOR DRAINAGE FLOODING.

BOTH THE GFS AND ECWMF DEPICT A TRAILING SHORT WAVE AND ASSOC SFC
FRONT APPROACHING AND MOVING ACROSS CENTRAL NC LATE SATURDAY OR
SATURDAY NIGHT. THEY SUGGEST THIS FEATURE WILL ENHANCE THE CHANCE
FOR SHOWERS AND PERHAPS A FEW TSTMS DURING THIS TIME. THEN THE MAIN
FORECAST CHALLENGE OCCURS FROM SUNDAY ONWARD...AS THE GFS IS MORE
PROGRESSIVE AND PUSHES THE FRONT FARTHER OFF THE COAST...WITH A
BREAK IN THE CLOUDS AND PRECIP ACROSS OUR AREA FROM MID-SUNDAY
THROUGH MONDAY. MEANWHILE...THE ECMWF STALLS THIS BOUNDARY AS WELL
OVER OUR AREA AND KEEPS THE CHANCE FOR RAIN ACROSS CENTRAL NC SUNDAY
RIGHT THROUGH EARLY TUESDAY. THUS...CONFIDENCE IS LOW FOR THIS PART
OF THE FORECAST.

THEREAFTER...BOTH THE GFS AND ECMWF SUGGEST THAT EVENTUALLY SOME
DRIER AIR WILL MOVE INTO OUR AREA DURING THE MIDDLE OF THE
WEEK...BUT CONFIDENCE FOR THIS PERIOD REMAINS LOW GIVEN THE SYNOPTIC
PATTERN WHICH FEATURES A BROAD TROUGH AND CYCLONIC FLOW PERSISTING
ACROSS THE EASTERN HALF OF THE COUNTRY.

TEMPS DURING THIS PERIOD WILL BE LARGELY DEPENDENT ON TIMING THE
CLOUDS AND PRECIP.  HOWEVER...WITH A PROLONG CLOUDY AND POTENTIALLY
WET PERIOD EXPECTED...LOOK FOR COOLER THAN NORMAL TEMPS MUCH OF THE
TIME. NORMAL TEMPS THIS TIME YEAR HAS HIGHS IN THE LOWER 80S AND
LOWS IN THE LOWER 60S.
 

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Still looking like an extended period of unsettled weather upcoming for parts of the Carolinas:

 

RAH HWO:

 

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
332 PM EDT WED SEP 10 2014

NCZ007>011-021>028-038>043-073>078-083>086-088-089-111945-
PERSON-GRANVILLE-VANCE-WARREN-HALIFAX-FORSYTH-GUILFORD-ALAMANCE-
ORANGE-DURHAM-FRANKLIN-NASH-EDGECOMBE-DAVIDSON-RANDOLPH-CHATHAM-WAKE-
JOHNSTON-WILSON-STANLY-MONTGOMERY-MOORE-LEE-HARNETT-WAYNE-ANSON-
RICHMOND-SCOTLAND-HOKE-CUMBERLAND-SAMPSON-
332 PM EDT WED SEP 10 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

A PERIOD OF WET WEATHER IS EXPECTED FRIDAY THROUGH THE
WEEKEND...AND PERHAPS INTO EARLY NEXT WEEK. MULTIPLE ROUNDS OF
RAIN DURING THIS TIME MAY RESULT IN LOCALIZED FLOODING OF SMALL
STREAMS AND CREEKS AND POOR DRAINAGE AREAS.


.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

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