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Forecast/storm discussions and part II Manitoba Mauler


Damage In Tolland
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.SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY NIGHT/...
A LIFE THREATENING...POTENTIALLY HISTORIC WINTER STORM EXPECTED
FROM LATE TODAY INTO TUESDAY...

NWP GUIDANCE HAS SHOWN A LITTLE MORE SPREAD THAN ONE WOULD LIKE TO
SEE AT SUCH A SHORT RANGE. MUCH OF THE 00Z GUIDANCE LOWERED QPF
AMOUNTS FOR MUCH OF THE REGION...WHICH WOULD MEAN LOWER SNOW
TOTALS. HOWEVER...THE 00Z ECMWF REMAINED VERY CONSISTENT WITH ITS
PREVIOUS RUNS. IT DID LOWER QPF SLIGHTLY...BUT THE OVERALL EVOLUTION
OF THE SYSTEM REMAINED SIMILAR TO ITS 12Z RUN. DID NOT WANT TO MAKE
DRASTIC CHANGES TO THE EXPECTED SNOW AMOUNTS AND HEADLINES WITH
JUST ONE MODEL CYCLE. IN FACT...THE LATEST 06Z NAM HAS COME INTO
CLOSER AGREEMENT WITH THE 00Z ECMWF. THE 21Z AND 03Z SREF MEANS
REMAINED SIMILAR TO THE 00Z ECMWF AND 06Z NAM.

THE 00Z GFS APPEARS TO BE A FAST NE OUTLIER. IT MAY ALSO BE
SUFFERING FROM CONVECTIVE FEEDBACK AS THE SURFACE LOW FOLLOWS QPF
MAXIMUM OFFSHORE...AND DOES NOT SEEM TO GET FULLY CAPTURED BY THE
UPPER LOW.

STILL ANTICIPATE THE LOW TO UNDERGO RAPID INTENSIFICATION AS THE
PARENT UPPER LOW CUTS OFF ALOFT NEAR THE MID ATLANTIC COAST
TONIGHT. THE LOW STALLS SE OF MONTAUK LATE TONIGHT INTO TUESDAY. A
PROLONGED PERIOD OF MODERATE TO HEAVY SNOW IS EXPECTED ON THE NW
FLANK OF THE LOW...IN THE DEFORMATION ZONE. THE MID LEVEL LOW
CENTERS AND INTENSE MID LEVEL FRONTOGENESIS WILL PROMOTE HEAVY
SNOW BANDS...BUT IT IS IMPOSSIBLE TO PREDICT THEIR LOCATION THIS
FAR OUT. MODELS ALSO HAVE A TENDENCY TO NOT SPREAD THE BEST LIFT
FAR ENOUGH NW IN INTENSE CYCLONES.

WITH ALL OF THIS IN MIND...DID LOWER SNOW TOTALS SLIGHTLY IN
COLLABORATION WITH SURROUNDING OFFICES AND WPC...BUT WE ARE STILL
EXPECTING AN OVERALL 18 TO 24 INCHES...LOCALLY HIGHER WHERE BEST
MESOSCALE SNOW BANDING SETS UP. SNOWFALL RATES OF 2-4 INCHES PER
HOUR EXPECTED LATE TONIGHT INTO TUE MORNING.

IN ADDITION...THE DEEP LOW PRESSURE COMBINED WITH STRONG HIGH
PRESSURE TO THE NORTH AND WEST AND HEAVY FALLING/BLOWING SNOW WILL
CREATE BLIZZARD CONDITIONS ACROSS THE ENTIRE REGION. A BLIZZARD
WARNING REMAINS IN EFFECT...WITH POTENTIAL FOR SUSTAINED WINDS UP
TO 35 MPH ON LONG ISLAND...AND WIND GUSTS RANGING FROM 40 MPH
INLAND...TO 45-50 MPH MOST ELSEWHERE. GUSTS UP TO 60 MPH CANNOT BE
RULED OUT ACROSS FAR EASTERN LONG ISLAND.

WITH THE LOW NEARLY STALLING NEAR CAPE COD ON TUESDAY...LIGHT TO
OCCASIONALLY MODERATE SNOW IS POSSIBLE IN MESOSCALE
BANDS...ESPECIALLY LATE TUESDAY MORNING INTO EARLY AFTERNOON.

TEMPS DURING THE STORM WILL GENERALLY BE IN THE 20S...EXCEPT
FALLING TO 15-20 TONIGHT INLAND. WIND CHILLS WILL BE MOSTLY IN
THE SINGLE DIGITS TO MID TEENS...BUT COULD GET CLOSE TO ZERO ACROSS
SOUTHERN CT. TEMPERATURES ON TUESDAY WILL ONLY BE IN THE LOWER TO
MIDDLE 20S.

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