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Christmas Storm III


Cold Rain

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Wow I am impressed with FFC EARLY FCST DISCUSSION! haha

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE PEACHTREE CITY GA

219 AM EST WED DEC 22 2010

.SHORT TERM /TODAY THROUGH FRIDAY/...

NOT MUCH DIFFERENCE BETWEEN THE MODELS IN THE SHORT TERM. THE COLD FRONT

ACROSS THE SOUTHEAST WILL PUSH ON THROUGH THE CWA TODAY AS THE UPPER

FLOW BECOMES NORTHWEST IN RESPONSE TO A SHORT WAVE H5 RIDGE THAT

WILL BUILD OVER THE MIDDLE OF THE COUNTRY. AHEAD OF THE FRONT THERE

WILL BE ISOLATE LIGHT SHOWERS/SPRINKLES AS THE DEEP MOISTURE WILL BE

WELL TO THE EAST. AFTER FROPA...WINDS WILL BECOME NORTHWEST AND A

BIT BREEZY. THE COLDER AIR WILL SPREAD ACROSS THE CWA BEHIND THE

FRONT THIS AFTERNOON AND TONIGHT. NORTHWEST WINDS AND HIGH CIRRUS

SHOULD KEEP TEMPS FROM BOTTOMING OUT TONIGHT. THURSDAYS MAX TEMPS

WILL BE ABOUT 10 DEGREES COLDER THAN TODAY...BUT AFTER THURSDAY

THERE SHOULD BE A SLOW MODERATION IN TEMPS.

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...

NEW GFS FALLING A LITTLE MORE IN LINE WITH THE NEW 00Z RUN OF THE

ECMWF IN TERMS OF LOCATION OF THE SURFACE LOW WITH THE CHRISTMAS

DAY SYSTEM. CURRENTLY THE STORM SYSTEM IS MOVING OVER SOUTHERN

CALIFORNIA. THIS WILL MOVE INTO THE SOUTHERN PLAINS BY FRIDAY

MORNING. THIS WAVE IS FORECAST TO DIG INTO THE NORTHERN GULF OF

MEXICO DEVELOPING A SURFACE LOW OVER THE NORTHERN GULF CHRISTMAS

DAY. DIFFERENCES IN TIMING STILL EXIST WITH THE GFS FASTER THAN

THE ECMWF...ALBEIT THE GFS HAS SLOWED DOWN FROM ITS PREVIOUS RUN.

IF THIS COMES TRUE...THE PRECIPITATION BY SATURDAY EVENING WILL BE

ALL SNOW ACROSS NORTH GEORGIA WITH RAIN ACROSS CENTRAL GEORGIA.

EVEN WITH A FASTER GFS...THE PRECIP COULD BEGIN AS SNOW ACROSS THE

EXTREME NORTHERN PART OF THE CWA SATURDAY MORNING AND REMAIN SNOW

ALL DAY SATURDAY. BUT...IF THE SURFACE LOW SHIFTS FURTHER

NORTH...THE PRECIP WILL BE IN THE FORM OF RAIN. AT THIS POINT

THERE IS ENOUGH UNCERTAINTY TO KEEP A RAIN/SNOW MIX...KEEPING IN

MIND THIS IS ENOUGH OF A QUESTION THAT WILL AFFECT TRAVEL

SOMEWHERE ACROSS GEORGIA ON CHRISTMAS DAY. AFTER THE SYSTEM PULLS

OUT...A 1035 HIGH DROPS OUT OF CENTRAL CANADA BRINGING ANOTHER

SHOT OF ARCTIC AIR FOR THE FIRST PART OF THE NEXT WEEK.

:weight_lift:

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HPC siding with ECMWF for preliminary forecast discussion

...SHORTWAVE SWINGING INTO THE SOUTHWEST DAY 1...PRELIMINARY PREFERENCE: 00Z/22 ECMWFTHE NAM TIMING OF THIS WAVE IS CLOSE TO THE ECMWF...WITH SLIGHTLYLESS AMPLITUDE BY THE TIME IT REACHES LOUISIANA BY THE END OF THEPERIOD. THE GFS AND GEM GLOBAL BEGIN TO PULL AHEAD OF THE NAM ANDECMWF LATE DAY 3 ALONG THE GULF COAST...WITH THE GFS SHOWING LESSAMPLITUDE LIKE THE NAM. THE UKMET CONTINUES TO BE ON THESLOW...SUPPRESSED SIDE OF THE GUIDANCE...A BIAS OF THE MODEL. THERE HAS BEEN A LOT OF TRENDING WITH THE SHORTWAVE OVER THE PASTSEVERAL MODEL CYCLES...WITH THE EXCEPTION OF THE ECMWF. THE ECMWFHAS BEEN CONSISTENT FOR THREE RUNS IN A ROW...AND WAS ALSO THEFIRST MODEL TO BREAK TOWARD A SLOWER...MORE SUPPRESSED SOLUTION. WILL CONTINUE TO RELY ON IT.

ATL_Militarypolice, I'll be in Lilburn with my family for Christmas. I actually grew up in Lilburn (off Cole Rd, near Parkview HS), but now live in St. Louis.

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I was just looking at past great Snowstorms in teh Southeast and this pressure tops them all from a very far south perspective. This is the inland version of March 1993 with the extreme phasing, so be careful using those qpf numbers, as they will be quite a bit higher in ATL GSP AVL and CLT regions. Easily those places are going to have an historic amount of snow if this verifies. Also, the snow gets going early in Georgia and all the old surface maps had a Savannah inverted trough going straight up through the western Carolinas to the Apps, which keeps an axis of heavy snow going, that the models have missed time and time again, so I'm confident that if this run of the 5H of Euro pans out, then the actual snow amount will be well over a foot in Athens, Greenville, Charlotte and closing in on 2 feet futher east in North Carolina and possibly South Carolina.

The only question is how accurate is the ECMWF being with the phasing. Too bad we don't know that yet. It makes all the difference though.

Also, blizzard conditions may extend well inland. The temps are going to be incredibly low.

Its just loony how the Euro keeps getting more and more intense with the phasing. Basically though, my thoughts remain unchanged. As expected, the low has shifted ever so slightly further south (at least initially) so that the heaviest precipitation rates will be felt across eastern NC. Thats not to say areas in the western Carolinas can't get on the action, its simply too early to know for sure how powerful of a system we are dealing with. The degree of phasing is extreme since the euro is essentially dealing with three pieces of energy that will phase together... the timing literally has to be perfect.

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