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Pittsburgh, PA Thread: Winter 2015-2016


meatwad

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on another note-there's a fresh 3.5" out there this morning of fluff!....hell-I guess if I get 3 more saturday I'll be happy I guess-I just don't know what is being seen when they go from a watch to a WARNING this morning calling for 7-11"

Are you in Farmington?

I guarantee you will get a good warning snow fall amount.

The warning were def needed for Fayette, Weatmoreland ridges, Greene.

Shocked State College hasn't put Somerset in a warning yet.

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Are you in Farmington?

I guarantee you will get a good warning snow fall amount.

The warning were def needed for Fayette, Weatmoreland ridges, Greene.

Shocked State College hasn't put Somerset in a warning yet.

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yea Im in Chalk Hill-about a mile from farmington....but colonel was saying EURO and GFS were both south overnight...I liked the SREF plumes he sent-which seem to correlate to the increase in snowfall potential....but if the NWS uses the traditional models, then it looks like I'm right on the fringe of 6".....I hope this thing goes north to help you guys out around PITT-so frustrating....hopefully after today's 12z it will be locked in to either celebrate of be frustrated again :(.......

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yea Im in Chalk Hill-about a mile from farmington....but colonel was saying EURO and GFS were both south overnight...I liked the SREF plumes he sent-which seem to correlate to the increase in snowfall potential....but if the NWS uses the traditional models, then it looks like I'm right on the fringe of 6".....I hope this thing goes north to help you guys out around PITT-so frustrating....hopefully after today's 12z it will be locked in to either celebrate of be frustrated again :(.......

Colonel is wrong. Euro bumped towards the north, and gfs was relatively the same as 0z but just a less expansive field to the north. SREF continued north

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yea Im in Chalk Hill-about a mile from farmington....but colonel was saying EURO and GFS were both south overnight...I liked the SREF plumes he sent-which seem to correlate to the increase in snowfall potential....but if the NWS uses the traditional models, then it looks like I'm right on the fringe of 6".....I hope this thing goes north to help you guys out around PITT-so frustrating....hopefully after today's 12z it will be locked in to either celebrate of be frustrated again :(.......

It was probably a little premature...:) I just got on board a little sleepy eyed..and saw the maps without doing any evaluation. The northern extent of snow on GFS wasn't as good due to more confluence but the storm itself wasn't more south from further evaluation. The maps just gave that appearance.  On the NAM I mis-red the red color.  Sorry for the confusion. 

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PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
511 AM EST THU JAN 21 2016

VALID 12Z THU JAN 21 2016 - 12Z SUN JAN 24 2016


DAYS 1 THROUGH 3...

...WEST... 

HEIGHTS WILL BUILD ANOMALOUSLY FROM THE WEST COAST TO THE INTERIOR
TO FORM A SHARP UPPER RIDGE THROUGH MUCH OF THE DAY ON THU. AN
AMPLIFIED UPPER TROUGH OVER THE EASTERN PAC WILL ATTEMPT TO
ADVANCE DOWNSTREAM ON THU... AS AN ASSOCIATED FRONTAL ZONE TRIES
TO REACH THE PACIFIC NORTHWEST/NORTHERN CA. THE SOUTHERLY
TRAJECTORY OF PACIFIC MOISTURE TRANSPORT WILL SPELL HEAVY
ACCUMULATIONS ACROSS THE NORTHERN WA CASCADES. THEN ON FRI... THE
UPPER RIDGE WILL SLIDE DOWNSTREAM... THE SYSTEM REACHING THE WEST
COAST ON THU WILL SHEAR INTO THE INTERMOUNTAIN WEST... WHILE
ANOTHER VERY FORMIDABLE SHORTWAVE TROUGH WILL ROLL INTO
NORTHERN/CENTRAL CALIFORNIA AND OREGON. EXPECT ANOTHER ROUND OF
HEAVY SNOW FOR THE SIERRA.

...LOWER MS VALLEY THROUGH TN/SOUTHERN OH VALLEYS INTO MID-ATL
STATES AND NORTHEAST... 

PHASING MID-UPPER LEVEL SHORTWAVES OVER THE LOWER MS VALLEY ARE
EXPECTED TO SPUR THE DEVELOPMENT OF A SURFACE LOW OVER THE LOWER
MS VALLEY THU EVENING. THIS IS FORECAST TO MARK THE ONSET OF WHAT
IS EXPECTED TO BE A MAJOR WINTER STORM FOR THE REGION AND IS
EXPECTED TO IMPACT A SIGNIFICANT PORTION OF THE EASTERN U.S. FROM
THE LOWER MS AND TN VALLEYS NORTHEASTWARD TO THE MID-ATLANTIC AND
PARTS OF THE NORTHEAST.

PHASING SHORTWAVES OVER THE LOWER MS VALLEY ARE EXPECTED TO
ESTABLISH AN AMPLIFIED TROUGH WITH A MID-UPPER CENTER CLOSING OFF
OVER THE REGION BY FRI MORNING. STRONG LOW LEVEL INFLOW AHEAD OF
THE DEVELOPING CYCLONE WILL DIRECT ABUNDANT MOISTURE FROM THE GULF
OVER A MODIFIED ARCTIC AIRMASS...RESULTING IN WIDESPREAD WINTRY
PRECIPITATION ACROSS EASTERN ARKANSAS INTO THE TENNESSEE AND LOWER
OHIO VALLEYS THU NIGHT INTO FRI. BOLSTERED BY FAVORABLE UPPER JET
FORCING AND LOW-MID LEVEL FRONTOGENESIS...THE MODELS ARE SHOWING
AN INCREASING INDICATION FOR AT LEAST LOCALLY HEAVY SNOWS ACROSS
KENTUCKY AND EASTERN TENNESSEE.

BY LATE FRI AS THE UPPER LOW CONTINUES TO DEEPEN AND TRACK TO THE
EAST...THE PARENT SURFACE LOW THEN MOVING TOWARD THE SOUTHERN
APPALACHIANS IS EXPECTED TO WEAKEN...WITH ENERGY TRANSFERRING TO A
LOW DEVELOPING ALONG THE SOUTHEAST COAST. STRONG MOISTURE
ADVECTION AFFORDED BY AMPLIFYING SOUTHEASTERLY FLOW INTERACTING
WITH COLD AIR DAMMING WITH ENSURE WIDESPREAD FROZEN PRECIPITATION
ACROSS THE MID ATLANTIC. SIGNIFICANT ICING IS POSSIBLE ACROSS
PORTIONS OF THE CAROLINAS...WITH HEAVY SNOW LIKELY FURTHER TO THE
NORTH. FAVORABLE UPPER JET FORCING...LOW-MID LEVEL FRONTOGENESIS
ALONG WITH OROGRAPHIC FORCING ARE EXPECTED TO RAISE THE
PROBABILITY OF HEAVY AMOUNTS ALONG THE VA/MD PIEDMONT BACK INTO
THE BLUE RIDGE LATE FRI INTO EARLY SAT.

BY EARLY SAT THE LOW IS EXPECTED TO BEGIN ITS TRACK NORTH ALONG
THE MID-ATLANTIC SEABOARD WITH A WELL-DEFINED COMM-AHEAD MOVING
FROM THE MID-ATLANTIC TO THE SOUTHERN NEW ENGLAND COAST.

WHILE CONFIDENCE IS HIGH THAT AT LEAST SOME PORTIONS OF THE
MID-ATLANTIC WILL BE IMPACTED WITH VERY HEAVY SNOW
ACCUMULATIONS...CONFIDENCE IN ITS PLACEMENT HAS BEEN TEMPERED BY
MODEL SPREAD WITH RESPECT TO THE TIMING/TRACK OF THIS SYSTEM. THE
EUROPEAN MODELS CONTINUE TO TRACK FASTER AND PAINT HEAVIER AMOUNTS
FURTHER TO THE SOUTH THAN THE NCEP MODELS. THE WPC FORECAST WAS
LARGELY COMPROMISE BETWEEN THE GFS AND THE ECMWF.


PEREIRA

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Probably just correcting towards the other models. It's been the northern outlier.

When do points under a WWA go to a WSW is the question of the day.  I think our worst fears were not realized overnight(A sprint on the models south). An aggregate view of the models show an undoubted northern tick to the storm, and all but Butler County northwards should keep an eye out. I think anyone thinking in Pitt we will be getting 3-4" is whistling Dixie.  Better make sure your snowblowers start guys.

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When do points under a WWA go to a WSW is the question of the day. I think our worst fears were not realized overnight(A sprint on the models south). An aggregate view of the models show an undoubted northern tick to the storm, and all but Butler County northwards should keep an eye out. I think anyone thinking in Pitt we will be getting 3-4" is whistling Dixie. Better make sure your snowblowers start guys.

NAM is significantly south. It is an extreme fringe job...I think 2-4 is a safe call for now. If gfs bumps north ok, but nam going south is really a bad indicator for us.

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When do points under a WWA go to a WSW is the question of the day. I think our worst fears were not realized overnight(A sprint on the models south). An aggregate view of the models show an undoubted northern tick to the storm, and all but Butler County northwards should keep an eye out. I think anyone thinking in Pitt we will be getting 3-4" is whistling Dixie. Better make sure your snowblowers start guys.

I don't see any scenario where PBZ gets warning criteria snows.

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I don't see any scenario where PBZ gets warning criteria snows.

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From NWS site:  

 

Winter Storm Warning

Issued for a winter weather event in which there is more than one hazard present, and one of the warning criteria listed above is expected to be met. For example, it would be issued if 5 inches of snow were expected in 12 hours, with some sleet mixing in at times. It is commonly issued for heavy snow with strong winds of 25-34 mph that will cause blowing and drifting of the snow. A Winter Storm Watch is issued when these conditions may be met 12 to 48 hours in the future.

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