Jump to content
  • Member Statistics

    17,584
    Total Members
    7,904
    Most Online
    LopezElliana
    Newest Member
    LopezElliana
    Joined

Thumpidity Dumpity or SWFiter Rainer 3-4/3-5 storm


Ginx snewx

Recommended Posts

  • Replies 548
  • Created
  • Last Reply

 

 

.LONG TERM /TUESDAY NIGHT THROUGH MONDAY/... ( <----think this is supposed to say Wednesday)

1) HIGHLIGHTS...

- PRECIP TRANSITION FROM SNOW TO RAIN WITH A WINTRY MIX BETWEEN

- WINTER WEATHER ADVISORY IN EFFECT

- IMPACTS ESPECIALLY TO THE TUESDAY AFTERNOON / EVENING COMMUTE

2) OVERVIEW...

INSIDE-RUNNER EVENT WITH AN AREA OF LOW PRESSURE ACROSS SW CANADA

AND A TRAILING COLD FRONT TOWARDS THE SW-CONUS AHEAD OF WHICH S-FLOW

OF WARM-MOIST AIR ISENTROPICALLY ASCENDS ACROSS S NEW ENGLAND. AN

OVER-RUNNING EVENT WITH A PUSH OF WARMER AIR N ALONG WITH INCREASING

THICKNESSES...ANTICIPATING AN INITIAL SNOW EVENT TUESDAY EVENING TO

TRANSITION SW-NE TO A WINTRY MIX BEFORE CHANGING TO RAIN /THOUGH

PERHAPS NOT FOR ALL LOCATIONS/.

TRICKY FORECAST IN NAILING DOWN TRANSITION TIMING WITH RESPECT TO

THERMAL FIELDS. THIS IS NOT A PERFECT FORECAST BY ANY MEANS. LIKELY

TO SEE SOME SLIGHT SHIFTS IN OUTCOMES. DETAILS ALONG WITH FORECAST

THINKING HIGHLIGHTED IN THE DISCUSSION BELOW...

3) PRECIPITATION OUTLINE...

VARIABILITY WITH RESPECT TO H925-85 THERMAL FIELDS AND H85-7/H100-85

THICKNESSES. PREFERENCE TO THE 02.12Z GFS AND REGIONAL CANADIAN WITH

THE ECMWF NOT FAR BEHIND. THE 3 WILL SERVE AS THE FORECAST CONSENSUS

FOR THE REMAINDER OF THIS DISCUSSION. BELIEVE THE NAM IS A TAD BIT

TOO WARM AND AGGRESSIVE. H925-85 WINDS ARE THE STRONGEST. EVEN WITH

THE PREVIOUS SNOW EVENT...NAM WAS THE WARMER/AGGRESSIVE OUTLIER. A

FORECAST CONSENSUS AVERAGES AROUND A 0.3-0.5 TOTAL-PRECIP EVENT.

SO LOOKING AT AN ADVISORY-LEVEL EVENT. SNOWS BEGINNING LATE TUESDAY

AFTERNOON INTO THE EVENING HOURS WILL TRANSITION TO A WINTRY MIX SW-

NE TOWARDS MIDNIGHT. WHILE INDICATIONS OF THE RAIN-LINE CREEPING N

WITH ENHANCED ONSHORE S-FLOW...THE DEEP SNOWPACK AND SUB-FREEZING

GROUND WILL LIKELY RESULT RAIN FREEZING ON THE SURFACE. THINKING A

GOOD THRESHOLD IN WHERE WARM-RAIN WOULD OVERCOME THE COLDER GROUND

IS AROUND 36-DEGREES. SHOULD SEE MOST OF THE AREA TRANSITION OVER TO

RAIN AS WE GO TOWARDS WEDNESDAY MORNING...BUT IT IS PERHAPS THAT N

MA LOCALES WILL STILL EXPERIENCING ICING WITH NEAR-FREEZING TEMPS

AND REMNANT DEEP SNOWPACK.

4) SNOWFALL...

MUCH OF THE SNOW OCCURRING FROM THE LATE AFTERNOON HOURS TUESDAY

TOWARDS MIDNIGHT WEDNESDAY. PERHAPS INITIALLY FLUFFY...SNOW LIKELY

TO MAINTAIN A WETTER CONSISTENCY WITH INFLUX OF WARMER AIR WITHIN

THE LOW-LEVELS. THINKING 10:1 TO 12:1 SNOW-TO-LIQUID RATIOS.

OVERALL DID NOT WANT TO BE CUTE WITH THE SNOWFALL AMOUNTS. LOOKING

AN AVERAGE 2-3 INCH SNOWFALL EVENT FOR MOST OF THE AREA. SOME AREAS

MAY SEE HIGHER AMOUNTS. WORTH NOTING...THIS IS SLIGHTLY LOWER THAN

WHAT WAS PREVIOUSLY FORECAST. THE MOST SIGNIFICANT CHANGE IS ACROSS

SE NEW ENGLAND. A FRONT-END THUMP IS TO BE ANTICIPATED OF SNOW INTO

THE EVENING PERIOD PRIOR TO TRANSITION. A COMBINATION OF ONSHORE S-

FLOW AND THINKING A WETTER SNOW WITH 1:10 RATIOS HAS LESSENED THE

AMOUNTS ON THE ORDER OF 2-3 INCHES.

5) SLEET AND FREEZING RAIN...

AGAIN...THE THRESHOLD FOR THE WINTRY MIX WILL BE SET AT 36-DEGREES.

FEEL WITH THE LINGERING ARCTIC TUNDRA THAT SURFACES WILL REMAIN SUB-

FREEZING FOR SLIGHTLY LONGER EVEN AS AIR TEMPERATURES WARM ABOVE THE

FREEZING-MARK. LOOKING AT THE WINTRY-MIX TIMEFRAME AROUND MIDNIGHT

WEDNESDAY INTO WEDNESDAY MORNING DURING WHICH TIME THERE WILL BE A S-

N TRANSITION TO PLAIN RAIN AS WARMER AIR USHERS IN AND N ALOFT.

PER A FORECAST CONSENSUS...EXPECT MORE SLEET THAN FREEZING RAIN...

ESPECIALLY IN AREAS OF MODERATE PRECIPITATION WHERE THERE WOULD BE

LIKELY LESS TIME RESIDING IN THE SHALLOW WARM-AIRMASS H9-7 ALOFT PER

GFS BUFKIT PROFILES DURING THE OVERNIGHT HOURS. THOUGH THERE IS SOME

CONCERN TOWARDS MORNING AS PRECIPITATION BEGINS TO BECOME LIGHTER

THAT AREAS ACROSS THE INTERIOR AT OR BELOW 34 DEGREES WOULD RESULT

IN SUB-FREEZING SURFACES TO FREEZE WITH THE PRESENCE OF RAIN.

SO WHILE NOT BY DEFINITION FREEZING RAIN...ICING ISSUES LOOK TO

DEVELOP BY MORNING ONCE THE WHOLE COLUMN WAS JUST ABOVE THE FREEZING-

MARK KEEPING IN MIND THE SUB-FREEZING GROUND CONDITIONS AND DEEP

SNOWPACK WE HAVE BEEN ENVELOPED.

EXPECTING ICE ACCUMULATIONS UPWARDS OF A TENTH OF AN INCH.

6) HEADLINES AND IMPACTS...

BASED ON THE FORECAST CONSENSUS...WILL BE GOING WITH AN ADVISORY FOR

ALL AREAS OF RESPONSIBILITY EXCEPT THE ISLANDS AS IT IS ANTICIPATED

THAT AREAS WILL SEE AT LEAST A TRACE OF A WINTRY MIX COMPRISED OF

SLEET AND FREEZING RAIN.

CONCERN FOR THE TUESDAY AFTERNOON AND EVENING COMMUTE AS SNOW WILL

BE LIKELY BEGINNING. SLICK AND SLIPPERY TRAVEL CONDITIONS ALONG WITH

SIGNIFICANTLY REDUCED VISIBILITIES. ALSO CONCERNS FOR WEDNESDAY MORN

ESPECIALLY OVER THE INTERIOR WITH THE POTENTIAL FOR ICING.

Link to comment
Share on other sites

We will see how this unfolds, 4-6" right now looks doable, But that alone won't get you there, All in all, Feb was not a record setter up here for my area, SW Maine and DE Maine it was though

 

From CAR's Feb summary:

EASTPORT IN WASHINGTON COUNTY OBSERVED 82.3

INCHES OF SNOW...WHICH IS AN UNOFFICIAL ALL-TIME RECORD MONTHLY

SNOWFALL FOR ANY LONG TERM CLIMATE SITES IN NORTHERN AND EASTERN

MAINE.

Most I've found for the GYX CWA is 88.3" at Long Falls Dam in Feb. 1969.  They had 56" in the end of month mega-dump.  Of course, Pinkham Notch had 130" that month.

Link to comment
Share on other sites

From CAR's Feb summary:

EASTPORT IN WASHINGTON COUNTY OBSERVED 82.3

INCHES OF SNOW...WHICH IS AN UNOFFICIAL ALL-TIME RECORD MONTHLY

SNOWFALL FOR ANY LONG TERM CLIMATE SITES IN NORTHERN AND EASTERN

MAINE.

Most I've found for the GYX CWA is 88.3" at Long Falls Dam in Feb. 1969.  They had 56" in the end of month mega-dump.  Of course, Pinkham Notch had 130" that month.

 

That would make sense for Eastport, They have been hit very hard

Link to comment
Share on other sites

These tend to come in quicker too I think. Probably 4-6pm in W SNE. 5-7pm in E SNE?

I'm just trying to figure out how it comes in. If it's light snow for 2-3 hrs then no big deal, just wet highways. But if it hits fast then that's a problem, Esp around HFD. My commute sucks as it, add 1"hr rates during rush hour, forget about it.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...