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August 2012 Observations and Discussions


NEG NAO

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833

FXUS61 KOKX 310852

AFDOKX

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE NEW YORK NY

452 AM EDT TUE JUL 31 2012

SHORT TERM /8 AM THIS MORNING THROUGH 6 PM WEDNESDAY/

MODELS HAVE TRENDED WWD WITH THE TRACK OF LOW PRES TODAY. HPC

INDICATES CONVECTIVE FEEDBACK LIKELY INFLUENCING THE NAM/GFS

SOLNS. FCST INCREASES CHANCES ACROSS ERN ZONES THIS AFTN...BUT

KEEPS WORDING AS CHANCE AS CONFIDENCE IS LOW IN THE WWD EXTENT OF

THE PCPN ZONE. ACROSS THE INTERIOR...ISOLD POPS FOR AFTN TSTMS.

TEMPS A BLEND OF THE MEH AND NAM12 TO ACCOUNT FOR A WEAKER

OFFSHORE SOLN.

ANY PCPN SHIELD SHUNTS EWD TNGT..THEN ACTIVITY APPROACHES FROM THE

W AS UPR TROF APPROACHES. KEPT POPS IN THE SLIGHT CHANCE RANGE

WITH NO OVERNIGHT SB INSTABILITY...CLOSER TO THE ECMWF SOLN.

CHANCES INCREASE THRU THE DAY ON WED AS THE TROF PASSES OVER THE CWA.

TEMPS WED BUMPED UP WITH TRANSIENT MID LVL THERMAL RIDGE. SOME

OF THE HOT SPOTS ACROSS NJ AND THE CITY COULD HIT 90.

LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/

AN UPPER TROUGH WEAKENS AND FILLS ALONG THE EAST COAST ON THU WITH

HEIGHTS RISES THROUGH THE UPCOMING WEEKEND. THE FORECAST AREA WILL

RESIDE AT THE SOUTHERN EDGE OF THE WESTERLIES WITH THE POTENTIAL FOR

SHORT WAVES TO MOVE ACROSS THE AREA. A DIGGING UPPER TROUGH ACROSS

THE GREAT LAKES SUN WILL TRACK ACROSS THE NE ON MON...SENDING A COLD

FRONT ACROSS THE REGION.

PRIOR TO NEXT MON...GENERALLY LOOKING AT WARM...MUGGY CONDITIONS...

WITH DAYTIME HIGHS IN THE MID 80S TO LOWER 90S...AND LOWS 70 TO 75.

DEW POINTS WILL BE AROUND 70 WITH HEAT INDICES APPROACHING 95 FOR

METRO NY DURING THIS TIME. GENERALLY LOOKING AT TEMPERATURES 5 TO 8

DEGREES ABOVE NORMAL.

AS FOR CONVECTION...IT LOOKS TO BE MAINLY DIURNALLY DRIVEN EACH

AFTERNOON WITH A MODERATELY UNSTABLE...WEAKLY SHEARED ENVIRONMENT.

ISOLATED STRONG THUNDERSTORMS COULD NOT BE RULED OUT. BEST CHANCE

LOOKS TO BE ACROSS THE INTERIOR. POTENTIAL EXISTS FOR A MORE

ORGANIZED EVENT ON MON WITH HEIGHT FALLS...A STRENGTHENING VERTICAL

WIND PROFILE...AND A COLD FRONT.

GLOBAL MODELS ARE IN DECENT AGREEMENT DURING THIS TIME WITH LARGE

SCALE SYNOPTIC FEATURES.

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While the 0z Euro is a complete torch next week, the ensembles are more normal type weather with troughiness in the Upper Mid-Atlantic.

We have seen this before this summer and almost every time the heat solutions worked out better.

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While the 0z Euro is a complete torch next week, the ensembles are more normal type weather with troughiness in the Upper Mid-Atlantic.

We have seen this before this summer and almost every time the heat solutions worked out better.

Now the 12z euro is much cooler then last night's run. Came towards its ensembles.

It went from 20+ 850's and a huge torch from days 7-10 to now 10-15 degree 850's. By day 10, there is a huge trough over the NE and 850 temps only in the 8-10 degree range.

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It's actually pretty laughable at the differences between the 0z and 12z euro.

0z run was a mega torch with temps approaching 100 degrees for several days next week.

12z run is the complete opposite and has temps below normal and by the end of the run well below normal.

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Now the 12z euro is much cooler then last night's run. Came towards its ensembles.

It went from 20+ 850's and a huge torch from days 7-10 to now 10-15 degree 850's. By day 10, there is a huge trough over the NE and 850 temps only in the 8-10 degree range.

extremes in either direction

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12z ecm and its ensembles night and day from last few runs with no heat after sunday and below normal temps by wed. It will be interesting to see how guidance trends. GFS in the middle with some warm days coupled with storms.

18z GFS also has a major trough in the East for late next week and into next weekend. With the SOI becoming negative and the heat dome pushing west, I still expect August to be the coolest month of this up-and-down summer.

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hopefully the Euro was on crack and reverts to its former solution. We have had enough rain, the lawns are green again and filled with crabgrass, nutsedge and other weeds. Why anyone would more clouds and rainfall is beyond me. Time for the sun to shine again, how long has it been since we have a stretch of truly sunny days with no clouds or rain chances

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