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NYC/Tri-State Area OBS and Disco


earthlight

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As of this morning, OKX in their zone forecasts are now separating Queens and Nassau Counties into northern and southern areas, and Passaic, Bergen, Essex and Union into western and eastern zones, i.e.

NYZ177-052130-

NORTHERN NASSAU-

350 AM EST SUN DEC 5 2010

.TODAY...PARTLY SUNNY. HIGHS IN THE UPPER 30S. NORTHWEST WINDS 10 TO

15 MPH WITH GUSTS UP TO 25 MPH.

.TONIGHT...MOSTLY CLOUDY. LOWS IN THE UPPER 20S. NORTHWEST WINDS

AROUND 15 MPH WITH GUSTS UP TO 30 MPH.

.MONDAY...MOSTLY CLOUDY WITH SCATTERED FLURRIES. WINDY WITH HIGHS IN

THE UPPER 30S. WEST WINDS 15 TO 25 MPH WITH GUSTS UP TO 35 MPH.

.MONDAY NIGHT...MOSTLY CLOUDY AND BREEZY. LOWS IN THE MID 20S. WEST

WINDS 15 TO 20 MPH WITH GUSTS UP TO 30 MPH.

.TUESDAY...PARTLY SUNNY WITH SCATTERED FLURRIES. WINDY WITH HIGHS IN

THE UPPER 30S. WEST WINDS 15 TO 25 MPH WITH GUSTS UP TO 35 MPH.

.TUESDAY NIGHT...MOSTLY CLEAR AND BRISK. LOWS IN THE MID 20S.

.WEDNESDAY...SUNNY AND BRISK. HIGHS IN THE UPPER 30S.

.WEDNESDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 20S.

.THURSDAY...SUNNY. HIGHS IN THE MID 30S.

.THURSDAY NIGHT...PARTLY CLOUDY IN THE EVENING...THEN BECOMING

MOSTLY CLOUDY. LOWS IN THE UPPER 20S.

.FRIDAY...MOSTLY CLOUDY. A CHANCE OF RAIN IN THE AFTERNOON. HIGHS IN

THE UPPER 30S. CHANCE OF RAIN 30 PERCENT.

.FRIDAY NIGHT...MOSTLY CLOUDY. A CHANCE OF RAIN IN THE EVENING. LOWS

IN THE LOWER 30S. CHANCE OF RAIN 30 PERCENT.

.SATURDAY...PARTLY SUNNY. HIGHS IN THE LOWER 40S.

NYZ179-052130-

SOUTHERN NASSAU-

350 AM EST SUN DEC 5 2010

.TODAY...PARTLY SUNNY AND BREEZY. HIGHS IN THE UPPER 30S. NORTHWEST

WINDS 15 TO 20 MPH WITH GUSTS UP TO 30 MPH.

.TONIGHT...MOSTLY CLOUDY AND BREEZY. LOWS IN THE UPPER 20S. WEST

WINDS 15 TO 20 MPH WITH GUSTS UP TO 30 MPH.

.MONDAY...MOSTLY CLOUDY WITH SCATTERED FLURRIES. WINDY WITH HIGHS IN

THE UPPER 30S. WEST WINDS 15 TO 25 MPH WITH GUSTS UP TO 40 MPH.

.MONDAY NIGHT...MOSTLY CLOUDY AND WINDY. LOWS IN THE MID 20S. WEST

WINDS 15 TO 25 MPH WITH GUSTS UP TO 35 MPH.

.TUESDAY...PARTLY SUNNY WITH SCATTERED FLURRIES. WINDY WITH HIGHS IN

THE UPPER 30S. WEST WINDS 15 TO 25 MPH WITH GUSTS UP TO 40 MPH.

.TUESDAY NIGHT...MOSTLY CLEAR AND BREEZY. LOWS IN THE MID 20S.

.WEDNESDAY...SUNNY AND WINDY. HIGHS IN THE UPPER 30S.

.WEDNESDAY NIGHT...PARTLY CLOUDY AND BRISK. LOWS IN THE MID 20S.

.THURSDAY...SUNNY. HIGHS IN THE UPPER 30S.

.THURSDAY NIGHT...PARTLY CLOUDY IN THE EVENING...THEN BECOMING

MOSTLY CLOUDY. LOWS IN THE UPPER 20S.

.FRIDAY...MOSTLY CLOUDY. A CHANCE OF RAIN IN THE AFTERNOON. HIGHS

AROUND 40. CHANCE OF RAIN 30 PERCENT.

.FRIDAY NIGHT...MOSTLY CLOUDY. A CHANCE OF RAIN IN THE EVENING. LOWS

IN THE LOWER 30S. CHANCE OF RAIN 30 PERCENT.

.SATURDAY...PARTLY SUNNY. HIGHS IN THE LOWER 40S.

I highlighted some subtle differences-slightly lower max temps, predicted in northern Nassau on Thursday and Friday, because of latitude and season, and higher wind gusts in Southern Nassau today, Tuesday and Friday, because of topography-it's flatter, less friction. It will be interesting to see if OKX ever recognizes and forecasts precipitation type differences and amounts between these areas such as rain and snow.

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This is the first time that I've ever seen reference to this by OKX (it was in their MFD):

.SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY/...

SFC LOW BOMBS OUT TONIGHT AS IT HITS NOVA SCOTIA AND NEW BRUNSWICK

EARLY MONDAY AM. CYCLONIC NW-W FLOW INCREASES ALONG WITH

CONSIDERABLE CLOUD COVER.

WINDS ARE THE BIG STORY WITH GUSTS IN THE 30 TO 35 MPH RANGE WITH A

PEAK OR TWO NEAR 40 BY MIDDAY MONDAY. PUT SCATTERED FLURRIES ALL

AREAS...BUT AGAIN NO DUSTING OR ANY TYPE OF ACCUMULATION. THIS IS

BASED ON LOW LEVEL CAPE SEEN IN NAM PROFILES WITH UP TO 50 J/KG OF

CAPE. KEPT THE SOUND EFFECT SNOW SHOWERS ON THE NORTH FORK OF LONG

ISLAND - SOME LIGHT ACCUMULATIONS HERE ARE POSSIBLE - THOUGH SFC

TEMPS ABOVE FREEZING.

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This is the first time that I've ever seen reference to this by OKX (it was in their MFD):

.SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY/...

SFC LOW BOMBS OUT TONIGHT AS IT HITS NOVA SCOTIA AND NEW BRUNSWICK

EARLY MONDAY AM. CYCLONIC NW-W FLOW INCREASES ALONG WITH

CONSIDERABLE CLOUD COVER.

WINDS ARE THE BIG STORY WITH GUSTS IN THE 30 TO 35 MPH RANGE WITH A

PEAK OR TWO NEAR 40 BY MIDDAY MONDAY. PUT SCATTERED FLURRIES ALL

AREAS...BUT AGAIN NO DUSTING OR ANY TYPE OF ACCUMULATION. THIS IS

BASED ON LOW LEVEL CAPE SEEN IN NAM PROFILES WITH UP TO 50 J/KG OF

CAPE. KEPT THE SOUND EFFECT SNOW SHOWERS ON THE NORTH FORK OF LONG

ISLAND - SOME LIGHT ACCUMULATIONS HERE ARE POSSIBLE - THOUGH SFC

TEMPS ABOVE FREEZING.

Sound effect snow?? Awesome drunk.gif

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Sound effect snow?? Awesome drunk.gif

My guess is that they finally begrudgingly acknowledged this phenomena because of the substantial period of time that their office had been relocated in Brookhaven close to where it takes place and because at least one of their forecasters was a member of this forum (or should I say Eastern and possibly now this one) who was familiar with the posts about it or the web site of one of its posters who extensively discusses it.

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PRELIMINARY EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

850 AM EST SUN DEC 05 2010

VALID 12Z THU DEC 09 2010 - 12Z SUN DEC 12 2010

GOOD MODEL AND ENSEMBLE AGREEMENT CONTINUES THRU MOST OF THE

FORECAST PERIOD AT LEAST THRU NEXT FRIDAY DAY 5. MAJOR DIFFERENCES

AND CONTINUITY CHANGES BEGIN TO SHOW LATER DAY 5 FRIDAY AND CARRY

THRU THE WEEKEND AND EARLY NEXT WEEK. THE BEGINNING DIFFERENCE IS

THE HANDLING OF A FAST MOVING PAC SHORTWAVE COMING INTO THE WEST

COAST IN THE LA NINA FLOW REGIME. THE OPERATIONAL 00Z AND 06Z

GFS/DGEX AND 00Z ECMWF BUILD MORE EPAC RIDGING NWD ALONG THE WEST

COAST DAY6 SAT ALLOWING FOR THIS SHORTWAVE TO DIG SOUTHEAST THRU

THE PLAINS. BY DAY 7 SUNDAY BOTH 00Z/06Z GFS/DGEX AND ESPECIALLY

00Z ECMWF HAVE A VERY WELL DEVELOPED SHORTWAVE WITH CLOSED MID

LEVEL LOW POTENTIAL. 00Z ECMWF THAN TAKES ANOTHER DIGGING

SHORTWAVE SOUTHWARD THRU CENTRAL CANADA AND PHASES IT INTO THE OH

VALLEY CLOSED LOW LATE DAY 7 AND DAY 8 CREATING A HYPER STORM WITH

CONCURRENCE BY DGEX. THIS EXTREME SOLUTION IS SIMILAR TO THE GREAT

STORM OF 25-26 NOV 1950. WHAT IS DISCONCERTING IS THAT CPC D+8 TO

D+11 ANALOGS HAVE INDICATED A SYNOPTIC PATTERN MATCHING THOSE

DATES FOR WEEKS INCLUDING TODAYS. THAT WAS ALSO A LA NINA YEAR

WITH A STRONG NEGATIVE NAO. DUE TO DECREASING MODEL VERIFICATION

AT THAT TIME WITH A SUDDEN CONTINUITY CHANGE IT IS PRUDENT TO STAY

AWAY FOR THIS TYPE OF SOLUTION AT LEAST FOR NOW. WHAT IS AGREED

UPON IS THE OVERALL PATTERN OF A RETURN OF WRN CONUS/ROCKY MTN

RIDGING AND A DEEP ERN CONUS TROF.

00Z GFS AND 06Z GFS WHILE DIGGING THIS SHORTWAVE AND CREATING A

POTENTIAL FOR A SIGNIFICANT ERN CONUS STORM ELIMINATE THE PHASING

POTENTIAL OF ECMWF BUT STILL HAVE AN ANALOG CORRELATION TO THE

ABOVE MENTIONED NOV 1950 EPISODE. A COMPROMISE SOLUTION THAT STILL

YIELDS THE POTENTIAL FOR CENTRAL AND ERN DEEPENING CYLOGENESIS IS

THE 06Z RUN OF THE GFS AND THIS WAS USED AS BASE FOR HPC MORNING

UPDATED PROGS.

ADDITIONAL FRONTAL RAINS COME INTO THE PAC NORTHWEST COAST AND NRN

CA WD WITH PCPN SPREADING EWD INTO THE NRN ROCKIES. UNSETTLED

CONDITIONS PERSIST INTO THE END OF THE WEEK. LOW PRESSURE COMING

EWD ALONG THE 49TH PARALLEL WED TO FRI WILL SPREAD A FAIRLY WIDE

AREA OF LIGHT SNOW ACROSS ND INTO MN AND THE GREAT LAKES REGION

INTO FRIDAY. THIS SYSTEM WILL THE REFORM OFF THE NEW ENG COAST

WITH SNOW POTENTIAL OVER COASTAL NEW ENG SAT.

UPSTREAM DIGGING SHORTWAVE AND DEVELOPING SFC LOW WILL ENHANCE

SOME NRN ROCKIES SNOW SAT THEN SPREAD SEWD ACROSS THE NRN AND

CENTRAL PLAINS INTO THE MS VALLEY SUN WITH A REFORMING SFC LOW

CENTER OVER THE SOUTHEASTERN SEABOARD LATE IN THE DAY. THIS SYSTEM

HAS THE POTENTIAL FOR A MODERATE BUT WINDY SNOW EVENT ACROSS IA/IL

AND INTO THE OH VALLEY. ANOTHER VERY SIGNIFICANT COLD AIR SURGE

ACROSS THE PLAINS INTO THE GULF COAST AND DEEP INTO THE SOUTHEAST

INCLUDING FLORIDA BY SUNDAY. LOW CONFIDENCE FORECAST WITH THE SFC

LOW TRACK BUT HIGH CONFIDENCE WITH THE COLD AIR SURGE.

ROSENSTEIN

Last Updated: 850 AM EST SUN DEC 05 2010

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Not out of the realm of possibility that there could be sound effect snow showers over the east end early next week.

NAM picking up the the Sound Effect potential out on the North Fork Monday.

http://forecast.weat...&glossary=1

KEPT THE SOUND EFFECT SNOW SHOWERS ON THE NORTH FORK OF LONGISLAND - SOME LIGHT ACCUMULATIONS HERE ARE POSSIBLE - THOUGH SFCTEMPS ABOVE FREEZING

whistle.gif

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