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ALEET ALEET December 7-8 Snow Threat


am19psu

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the euro has a higher grid resolution than the gfs...

I seem to recall a discussion of model verification scores by some mets on the main forum earlier this year discussing how good each model was at which time frame. If I remember correctly, the euro was clearly superior to all others at days 3-8, but at day 2, I think it was the GFS or NAM (forget which) that was actually a little better. Of course, that was earlier this year, so who knows now whether that remains true.

Maybe Tony or Adam can chime in when they have the chance.

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Even at Days 1 and 3, the Euro is marginally better (in general).

cor_day1_HGT_P500_G2NHX_00Z.png

cor_day3_HGT_P500_G2NHX_00Z.png

IOW, you better have a good reason for throwing out its solution. For the tropics this year, I was using 2 parts Euro, 1 part GFS EnKF (which doesn't exist for snow), and 1 part UKMET with pretty good success.

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Even at Days 1 and 3, the Euro is marginally better (in general).

cor_day1_HGT_P500_G2NHX_00Z.png

cor_day3_HGT_P500_G2NHX_00Z.png

IOW, you better have a good reason for throwing out its solution. For the tropics this year, I was using 2 parts Euro, 1 part GFS EnKF (which doesn't exist for snow), and 1 part UKMET with pretty good success.

What I find most interesting here is the JMA verification.

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WSW up for Monroe, Carbon, Sussex

Winter Storm Watch

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

310 PM EST TUE DEC 6 2011

NJZ001-PAZ054-055-071030-

/O.NEW.KPHI.WS.A.0009.111208T0300Z-111208T1200Z/

SUSSEX-CARBON-MONROE-

INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG

310 PM EST TUE DEC 6 2011

...WINTER STORM WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH

THURSDAY MORNING...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER

STORM WATCH...WHICH IS IN EFFECT FROM WEDNESDAY EVENING THROUGH

THURSDAY MORNING.

* LOCATIONS...CARBON AND MONROE COUNTIES IN THE SOUTHERN POCONOS

AND SUSSEX COUNTY IN NEW JERSEY.

* HAZARD TYPES...HEAVY SNOW EXPECTED.

* ACCUMULATIONS...3 TO 8 INCHES WITH THE GREATEST ACCUMULATIONS IN

THE HIGHER TERRAIN.

* TIMING...THE RAIN SHOULD START CHANGING TO SNOW OVER THE HIGHER

TERRAIN IN THE POCONOS DURING WEDNESDAY EVENING AND CHANGE OVER

IN ALL AREAS BY VERY EARLY THURSDAY MORNING. THE SNOW SHOULD END

AROUND THE START OF THE MORNING COMMUTE ON THURSDAY.

* IMPACTS...THE GREATEST COMMUTING IMPACT SHOULD OCCUR THURSDAY

MORNING. BUT ANYONE DRIVING WEDNESDAY EVENING AND NIGHT COULD

FACE DIFFICULT TRAVEL. SNOWFALL RATES OF 1 TO 2 INCHES PER HOUR

ARE POSSIBLE DURING THE HEIGHT OF THE STORM.

* WINDS...NORTHWEST 10 TO 15 MPH WITH GUSTS UP TO 20 MPH. THE SNOW

IS EXPECTED TO BE ON THE WETTER SIDE, SO BLOWING AND DRIFTING

SHOULD BE LESS THAN AVERAGE.

* TEMPERATURES...WILL FALL THROUGH THE 30S AND BY THURSDAY MORNING

WILL BE IN THE UPPER 20S AND LOWER 30S.

* VISIBILITIES...ONE QUARTER MILE OR LESS AT TIMES. THIS WILL MAKE

FOR DIFFICULT TRAVEL ESPECIALLY ON HIGHER TERRAIN ROADWAYS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT

SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.

CONTINUE TO MONITOR THE LATEST FORECASTS.

&&

$$

/GIGI

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Well based on the 6-12 hr progs vs the 00z soundings, I'd say this is going to come out a little bit stronger with the 00z runs. The trof if anything looks slightly slower than modeled, overall pretty well. There are no surprises with the 250mb winds, euro best here. There are colder 850mb and 925mb temps than progged by all west of the trof in the midwest. On our side, the cold air is not oozing east any faster, euro has the best handle here, gfs nam maybe 1c too cold in places. As far as qpf for the last six hours, gfs and nam thankfully overstated the amounts, more isolated half inchers than wide swaths in the mid atlc, euro best of the lot here. Mark's local program gives PHL 1.92" as the best estimate for the event from 7 pm onward, we'll see. Good luck everyone!

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