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PHL JAN 20/21 Obs and Discussion Thread


tombo82685

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WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 7 AM EST FRIDAY

UNTIL 4:00PM EST

Urgent - Winter Weather Message

National Weather Service Mount Holly NJ

335 AM EST Thu Jan 20 2011

New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-

Queen Annes-Talbot-Caroline-Salem-Gloucester-Camden-

Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-

Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-

Southeastern Burlington-Delaware-Philadelphia-

Including The Cities Of...Wilmington...Dover...Georgetown...

Rehoboth Beach...Elkton...Chestertown...Centreville...Easton...

Denton...Pennsville...Glassboro...Camden...Cherry Hill...

Moorestown...Mount Holly...Jackson...Millville...Hammonton...

Cape May Court House...Ocean City...Atlantic City...

Long Beach Island...Wharton State Forest...Media...Philadelphia

...Winter Weather Advisory In Effect From 7 PM This Evening To

7 AM EST Friday...

The National Weather Service In Mount Holly Has Issued A Winter

Weather Advisory For Snow...Which Is In Effect From 7 PM This

Evening To 7 AM EST Friday.

• Precipitation Type: Snow.

• Accumulations: Two To Three Inches. Highest Near Metropolitan Philadelphia

And Southern New Jersey.

• Timing: Beginning After 7 PM And Lasting For About 12 Hours.

• Impacts: Slippery Road Conditions And Reduced Visibilities.

Precautionary/Preparedness Actions...

A Winter Weather Advisory Means That Periods Of Snow...Sleet...Or

Freezing Rain Will Cause Travel Difficulties. Be Prepared For

Slippery Roads And Limited Visibilities...And Use Caution While

Driving.

&& Bulletin Issued: Thursday, January 20, 2011 3:35 AM EST

Bulletin Expires: Thursday, January 20, 2011 4:00 PM EST

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URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

335 AM EST THU JAN 20 2011

...ACCUMULATING SNOW TONIGHT AND FRIDAY MORNING...

NJZ001-007>010-012>015-PAZ054-055-060>062-067>069-202100-

/O.NEW.KPHI.WW.Y.0006.110121T0000Z-110121T1400Z/

SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-

WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-CARBON-MONROE-BERKS-

LEHIGH-NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-

INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN...

FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...FREEHOLD...SANDY HOOK...

TRENTON...JIM THORPE...STROUDSBURG...READING...ALLENTOWN...

BETHLEHEM...EASTON...WEST CHESTER...NORRISTOWN...DOYLESTOWN

335 AM EST THU JAN 20 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO

9 AM EST FRIDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A WINTER

WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM 7 PM THIS

EVENING TO 9 AM EST FRIDAY.

* PRECIPITATION TYPE: SNOW.

* ACCUMULATIONS: THREE TO FOUR INCHES. HIGHEST ACROSS THE SOUTHERN

POCONOS AND NORTHERN NEW JERSEY.

* TIMING: BEGINNING AFTER 7 PM TONIGHT AND LASTING INTO FRIDAY

MORNING.

* IMPACTS: SLIPPERY ROAD CONDITIONS AND REDUCED VISIBILITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR

FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR

SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE

DRIVING.

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gfs brings rain to bout bear delaware.

6z NAM looks much more amplified, as I commented in the NYC thread. I doubt Mt. Holly is going to upgrade to a warning but Upton could since a lot of QPF falls at 30 hrs for NYC metro...it gets pretty far down the Jersey Shore too with the 1004mb coastal just offshore. There's definitely a NW trend starting, again.

6z GFS looks about the same. PHL sees a bit more than .25" QPF while NYC is probably around .35" QPF. Not a bad storm with these ratios.

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6z NAM looks much more amplified, as I commented in the NYC thread. I doubt Mt. Holly is going to upgrade to a warning but Upton could since a lot of QPF falls at 30 hrs for NYC metro...it gets pretty far down the Jersey Shore too with the 1004mb coastal just offshore. There's definitely a NW trend starting, again.

6z GFS looks about the same. PHL sees a bit more than .25" QPF while NYC is probably around .35" QPF. Not a bad storm with these ratios.

phl is .3-.35 on the gfs... all snow, but like i said just 30 or so miles to there south its a mix or rain.

GFS_3_2011012006_F36_PCPIN_24_HR.png

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gfs brings rain to bout bear delaware, bout 10 miles south of wilmington

bottom layer FTL. I looked at the temp profile after I posted my comment (I look at the 850's only initially) and yeah, the bottom layer "torches" a bit on the GFS.

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12z NAM a little closer to the coast.

QPF across eastern PA ranges from 0.25"-0.50" (highest in Pike Country in NE PA).

Jersey ranges from about 0.20" near Cape May to 0.60" in extreme northern Jersey.

Northern DE in the 0.15"-0.25" range.

850s climb just above 0C across southern Jersey overnight.

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