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Glenn F. Schreiber DMD and Glenn Schreiber is theweatherguy writing about Philadelphia Weather [radar] [surface map] [disclaimer]
   

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  • Glenn F Schreiber
    aka "theweatherguy"

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  •        
    Fri, 11 Jan 2008

    Weekend Weather Forecast- Fri PM [2]
    High pressure builds in over the weekend, but the models do not have the temperatures falling very far, in fact, temps remain above normal. This will impact the weather system approaching on Sunday. 10 PM UPDATE: Latest NAM model is suggesting heavy snow again for Sunday night....over 1.2 inches water falling with critical levels of the atmosphere at or below freezing. This potential storm continues to bear watching.

    The models continue to show a low pressure system developing along the coastline. Upper air temperatures will support snow, but the models suggest temperatures at the surface will not be below freezing.

    We need to watch this, since small changes will make a big change in the forecast. The GFS has gone back to predicting almost 3/4 of an inch of water falling, starting during the later part of the afternoon on Sunday. While starting as rain, the precip will definitely change to wet snow in Philadelphia and north and west. Whether we have a winter storm will depend on ground surface temps, which are, at this time, expected to be above freezing.

    The models haven't shown great consistency. Look for changes in the forecast.

    Sat 1/12: Partly sunny. High 52

    Sun 1/13: Some sun early, becoming cloudy late morning. Rain begins late afternoon, mixing with and changing to wet snow. Snow may accumulate during the evening. High 47.

    posted: Jan 11 2008 at 10:14 pm

    [/weather/jan08] permanent link

    Weekend Weather Forecast- Fri PM
    High pressure builds in over the weekend, but the models do not have the temperatures falling very far, in fact, temps remain above normal. This will impact the weather system approaching on Sunday.

    The models continue to show a low pressure system developing along the coastline. Upper air temperatures will support snow, but the models suggest temperatures at the surface will not be below freezing.

    We need to watch this, since small changes will make a big change in the forecast. The GFS has gone back to predicting almost 3/4 of an inch of water falling, starting during the later part of the afternoon on Sunday. While starting as rain, the precip will definitely change to wet snow in Philadelphia and north and west. Whether we have a winter storm will depend on ground surface temps, which are, at this time, expected to be above freezing.

    The models haven't shown great consistency. Look for changes in the forecast.

    Sat 1/12: Partly sunny. High 52

    Sun 1/13: Some sun early, becoming cloudy late morning. Rain begins late afternoon, mixing with and changing to wet snow. Snow may accumulate during the evening. High 47.

    posted: Jan 11 2008 at 7:08 pm

    [/weather/jan08] permanent link

    Cancel that Storm- Fri AM
    The GFS and NAM models have moved away from their previous development of a strong coastal storm near us. The NOGAPS still has some light snow affecting us Monday morning.

    This changing scenario for a winter storm has been a problem with past potential storms this season. Sorry for the false alarms. The forecasts can only be as good as the continuity of the models.

    More info later today.

    posted: Jan 11 2008 at 5:56 am

    [/weather/jan08] permanent link



    Disclaimer: I am not a meteorologist and provide this information as a hobby and for entertainment (mostly my own :-) . While attempts are made to predict the weather as best as I can, use at your own risk! I am NOT responsible for any direct or indirect consequential injury/damages due to your use of these forecasts. Always check the NWS Official Forecast for your final plans.

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