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Philadelphia Weekend Weather and Storm Forecasts

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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Mon, 26 Jan 2009
Philadelphia Winter Weather- Mon 10:50 PM Update
The latest NAM data now available...here are the trends. The model delays the precipitation until later Tuesday evening, with very little during the day on Tuesday. Upper temperatures warm, but ground temperatures remain cold through Tuesday night. A period of heavy icing is possible by daybreak Wed, according to the NAM.
Tonight's latest GFS joins the NAM with delaying the heavier precipitation well into the late evening. Temperatures at the surface are very cold, with sleet and snow and considerable icing probable as rain mixes and freezes at the surface after midnight Tuesday. The change to all rain likely on Wednesday, but surface temperatures, especially north of the city, will cause significant icing.
Cold air returns at the end of the storm later Wednesday afternoon with a change back to snow before evening on Wednesday.

posted: Jan 26 2009 at 10:49 pm

[/weather/jan09] permanent link

Philadelphia Winter Weather- Mon 10 PM Update
The latest NAM data now available...here are the trends. The model delays the precipitation until later Tuesday evening, with very little during the day on Tuesday. Upper temperatures warm, but ground temperatures remain cold through Tuesday night. A period of heavy icing is possible by daybreak Wed, according to the NAM.

Cold air returns at the end of the storm later Wednesday afternoon with a change back to snow before evening on Wednesday. To really get an idea on the forecast trends, we'll have to wait for the GFS. The latest GFS data not available until about 10:45 PM.

posted: Jan 26 2009 at 10:12 pm

[/weather/jan09] permanent link

Philadelphia Winter Weather Update- Mon Early PM
The latest models have another fixed precipitation event for Philadelphia. Overruning moisture will cause to light snow to form (a coating to an inch) during the daytime on Tuesday. The approaching low will bring more direct effects late Tuesday afternoon and evening with several inches of snow possible before a changeover to sleet and freezing rain after midnight. Perhaps 4 inches of snow is possible before the changeover after midnight.
The question will be how warm surface temperatures get on Wednesday, both at daybreak and during the day. While the changeover to sleet and rain is fairly certain to occur before daybreak on Wednesday, cold air damming and very cold established surface temperature may cause this mix to freeze on roadways and already fallen snow. This will cause very slippery conditions for Wednesday morning and a more extended period of icing to our north.
Cold air returns at the end of the storm later Wednesday afternoon with a change back to snow before evening on Wednesday. Updates to follow.

posted: Jan 26 2009 at 7:52 pm

[/weather/jan09] permanent link

Philadelphia Winter Weather Update- Mon AM
Latest model has light snow for Tuesday, but an eventual turnover to sleet and then rain by Wednesday. Perhaps some slippery driving Wed morning, but forget the snowstorm.
I'll keep an eye on this one.

posted: Jan 26 2009 at 7:06 am

[/weather/jan09] 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.

The weatherguy.net home page has been visited times since October 2003.

theweatherguy's website
		Philadelphia Weekend Weather and Storm Forecasts
Glenn F. Schreiber DMD and Glenn Schreiber is theweatherguy writing about Philadelphia Weather [radar] [surface map] [disclaimer]
	About this blog theweatherguy's website, "Thoughts and comments on Philadelphia Weather and Daily Life." Glenn F Schreiber aka "theweatherguy" Photos Weather Definitions Copy link for RSS feed Links These are a few of my favorite links. National Weather Service Official Forecasts Meteorology Glossary Archives Weather Archives: 13: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 12: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 11: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 10: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 09: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 08: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 07: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 06: Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec 05: Apr May Jun July Aug Sept Oct Nov Dec Commentary: Miscellaneous Find	Mon, 26 Jan 2009 Philadelphia Winter Weather- Mon 10:50 PM Update The latest NAM data now available...here are the trends. The model delays the precipitation until later Tuesday evening, with very little during the day on Tuesday. Upper temperatures warm, but ground temperatures remain cold through Tuesday night. A period of heavy icing is possible by daybreak Wed, according to the NAM. Tonight's latest GFS joins the NAM with delaying the heavier precipitation well into the late evening. Temperatures at the surface are very cold, with sleet and snow and considerable icing probable as rain mixes and freezes at the surface after midnight Tuesday. The change to all rain likely on Wednesday, but surface temperatures, especially north of the city, will cause significant icing. Cold air returns at the end of the storm later Wednesday afternoon with a change back to snow before evening on Wednesday. posted: Jan 26 2009 at 10:49 pm [/weather/jan09] permanent link Philadelphia Winter Weather- Mon 10 PM Update The latest NAM data now available...here are the trends. The model delays the precipitation until later Tuesday evening, with very little during the day on Tuesday. Upper temperatures warm, but ground temperatures remain cold through Tuesday night. A period of heavy icing is possible by daybreak Wed, according to the NAM. Cold air returns at the end of the storm later Wednesday afternoon with a change back to snow before evening on Wednesday. To really get an idea on the forecast trends, we'll have to wait for the GFS. The latest GFS data not available until about 10:45 PM. posted: Jan 26 2009 at 10:12 pm [/weather/jan09] permanent link Philadelphia Winter Weather Update- Mon Early PM The latest models have another fixed precipitation event for Philadelphia. Overruning moisture will cause to light snow to form (a coating to an inch) during the daytime on Tuesday. The approaching low will bring more direct effects late Tuesday afternoon and evening with several inches of snow possible before a changeover to sleet and freezing rain after midnight. Perhaps 4 inches of snow is possible before the changeover after midnight. The question will be how warm surface temperatures get on Wednesday, both at daybreak and during the day. While the changeover to sleet and rain is fairly certain to occur before daybreak on Wednesday, cold air damming and very cold established surface temperature may cause this mix to freeze on roadways and already fallen snow. This will cause very slippery conditions for Wednesday morning and a more extended period of icing to our north. Cold air returns at the end of the storm later Wednesday afternoon with a change back to snow before evening on Wednesday. Updates to follow. posted: Jan 26 2009 at 7:52 pm [/weather/jan09] permanent link Philadelphia Winter Weather Update- Mon AM Latest model has light snow for Tuesday, but an eventual turnover to sleet and then rain by Wednesday. Perhaps some slippery driving Wed morning, but forget the snowstorm. I'll keep an eye on this one. posted: Jan 26 2009 at 7:06 am [/weather/jan09] 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. The weatherguy.net home page has been visited times since October 2003.