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Central PA/fringes of MD - December 2013 continued


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Contrary to what we usually see out of the HPC (WPC, whatever) is quite bullish on accumulations Saturday.

 

This is the HPC's 50% right in the middle of the guidance "best guess" on accumulations from 12z Sat through 12z Sun. 

 

attachicon.gifScreen Shot 2013-12-13 at 10.54.08 AM.png

 

Here is the 75% map, showing the top quartile of snowfall potential. The light blue is indeed 12-15" EDIT: Might be 10-12" instead...the legend has 3 shades of light blue but the map has only two.

 

attachicon.gifScreen Shot 2013-12-13 at 10.54.19 AM.png

 

Even the 25% accumulations show 6-8" across a lot of the area. The HPC has high confidence that this will be a significant, approaching major snowfall across PA. 

 

 

Maps: http://www.wpc.ncep.noaa.gov/pwpf/wwd_percentiles.php?ftype=percentiles&fpd=24&ptype=snow

If I understand their method correctly... a map showing 6-8" at 25% means that there is a 75% chance of higher than 6-8" accumulations for that region! wow

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Agreed - Miller Bs shaft someone, and the trend these past several winters is to shaft UNV/AOO/JST/IPT area.

remember too that this system isnt modeled to show any bombing of the coastal low... this likely would reduce the threat of major dry slotting with a weaker energy transfer... some dry slotting will still likely occur but I think too that a weaker energy transfer would also reduce snowfall rates...

 

incredible NWS/HPC/etc going this crazy still 24 hours out...

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oh and Winter Storm Warning for you... and for you... and for you...

 

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1132 AM EST FRI DEC 13 2013

...HEAVY SNOW EXPECTED SATURDAY AFTERNOON AND SATURDAY NIGHT...

.A SIGNIFICANT WINTER STORM WILL IMPACT CENTRAL PENNSYLVANIA THIS
WEEKEND. SNOW ACCUMULATIONS BETWEEN 5 TO 8 INCHES ARE EXPECTED
ACROSS A WIDE AREA OF CENTRAL PENNSYLVANIA. THE SNOW COULD MIX
WITH OR CHANGE TO SLEET AND FREEZING RAIN ACROSS PORTIONS OF THE
LOWER SUSQUEHANNA VALLEY SATURDAY NIGHT.

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-
049>053-056>059-063>066-140400-
/O.UPG.KCTP.WS.A.0010.131214T1000Z-131215T0600Z/
/O.NEW.KCTP.WS.W.0008.131214T1000Z-131215T0900Z/
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-
JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-
CUMBERLAND-ADAMS-YORK-LANCASTER-
INCLUDING THE CITIES OF...WARREN...BRADFORD...COUDERSPORT...
ST. MARYS...RIDGWAY...EMPORIUM...RENOVO...DUBOIS...CLEARFIELD...
PHILIPSBURG...STATE COLLEGE...JOHNSTOWN...ALTOONA...HUNTINGDON...
MOUNT UNION...LEWISTOWN...MIFFLINTOWN...SOMERSET...BEDFORD...
MCCONNELLSBURG...CHAMBERSBURG...MANSFIELD...WELLSBORO...LAPORTE...
LOCK HAVEN...WILLIAMSPORT...LEWISBURG...SELINSGROVE...DANVILLE...
SUNBURY...SHAMOKIN...BLOOMSBURG...BERWICK...NEWPORT...
HARRISBURG...HERSHEY...POTTSVILLE...LEBANON...CARLISLE...
GETTYSBURG...YORK...LANCASTER
1132 AM EST FRI DEC 13 2013

...WINTER STORM WARNING IN EFFECT FROM 5 AM SATURDAY TO 4 AM EST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 5 AM SATURDAY
TO 4 AM EST SUNDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* LOCATIONS...ALL OF CENTRAL PENNSYLVANIA AND THE SUSQUEHANNA VALLEY.

* HAZARD TYPES...HEAVY SNOW...POSSIBLY CHANGING TO SLEET OR
  FREEZING RAIN SATURDAY NIGHT ACROSS THE LOWER SUSQUEHANNA
  VALLEY.

* ACCUMULATIONS...5 TO 8 INCHES OF SNOW.

* TIMING...LIGHT SNOW WILL BEGIN ACROSS THE REGION NEAR SUNRISE
  SATURDAY. SNOW FALL INTENSITIES WILL INCREASE SATURDAY AFTERNOON
  AND EVENING.

* IMPACTS...WIDESPREAD HAZARDOUS TRAVEL DUE TO SNOW COVERED ROADS
  AND REDUCED VISIBILITY CAN BE EXPECTED.

* WINDS...EAST 5 TO 10 MPH WITH GUSTS UP TO 20 MPH.

* TEMPERATURES...IN THE 20S...TO NEAR 30 IN THE SOUTHEAST.

* VISIBILITIES...ONE TO TWO MILES SATURDAY MORNING DECREASING TO
  UNDER ONE MILE SATURDAY AFTERNOON AND SATURDAY NIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DANGEROUS WINTER WEATHER CONDITIONS ARE EXPECTED OR OCCURRING.
USE EXTREME CAUTION IF PLANNING TO TRAVEL. FOR THE LATEST WEATHER
INFORMATION...GO TO WEATHER.GOV/CTP OR STAY TUNED TO NOAA WEATHER
RADIO.

REPORT SNOW AND ICE ACCUMULATION TO THE NATIONAL WEATHER SERVICE
STATE COLLEGE BY SENDING AN EMAIL TO [email protected]...
POSTING TO THE NWS STATE COLLEGE FACEBOOK PAGE...OR TWEET
@NWSSTATECOLLEGE WITH THE HASHTAG #CTPWX.

 

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oh and Winter Storm Warning for you... and for you... and for you...

 

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE STATE COLLEGE PA

1132 AM EST FRI DEC 13 2013

...HEAVY SNOW EXPECTED SATURDAY AFTERNOON AND SATURDAY NIGHT...

 

So much for a normal weekly Grocery run. all the nut bags will be out

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I for one think places like york and lancaster should only have an advisory for 2 to 4. Nothing I see implies 5 to 8.

 

The NAM has 0.93" qpf for LNS. I don't think 5" is unreasonable, with higher amounts in norlanco.

I'm still only counting on 3-4, but that's because I prefer to play things conservative regardless of what models say and because no one relies on my forecast.

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Maybe you should give the NWS a call.

 

 

The NAM has 0.93" qpf for LNS. I don't think 5" is unreasonable, with higher amounts in norlanco.

I'm still only counting on 3-4, but that's because I prefer to play things conservative regardless of what models say and because no one relies on my forecast.

 

 

Quite a few runs have given the area 6"+

thats why i blocked him last year or the year before that. I only see yorkpa posts if someone quotes him

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Those point and clicks are constantly changing, 20 minutes ago it was 2-4, then 3-5, now back to 2-4

 

the offices are obviously speaking to each other and trying to figure out the best way to approach areas that borderline other offices, re: york for example.

 

I've also noticed that the zone forecasts, point and click and the warning text doesn't always jive.

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