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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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Sat, 24 Feb 2007
Winter Storm Update- Sat PM
Low pressure is expected to move across our area from the west late Sunday, with precipitation reaching us around 3-6 PM on Sunday. There are differences between the models, with the NAM-WRF model being much colder and wetter than the GFS.
Let me go through the differences: While both models have precip starting late afternoon. The GFS is warmer aloft than the NAM- the NAM starts things as snow, while the GFS starts things as sleet. The GFS continues with sleet changing to freezing rain with a total precipitation of about 0.60 inches water, then back to snow flurries.
The NAM, on the otherhand, has a change to sleet and some freezing rain, but has a changeover back to snow before daybreak Monday with greater storm development and snowfall amounts. The NAM has over 1.00 inch of water falling as a mix of snow, sleet and freezing rain, then with light snow showers possible into early Monday afternoon.
The NAM has the rain/snow line right around Philadelphia...PHL airport has slightly warmer conditions than PNE airport and more snowfall north. Areas to the north and west may have a significant snowfall of 6+ inches with ice accumulation.

Sun 2/25: Bright skies very early, then becoming cloudy with a mix of snow and sleet starting between 3-6 PM, changing to freezing rain later. Possibly 2-4 inches accumulation before a shift to mostly freezing rain with higher amounts north and west. Difficult driving conditions likely Monday morning, especially north and west.

posted: Feb 24 2007 at 10:20 pm

[/weather/feb07] permanent link

Ice to Freezing Rain to Snow- Sunday thru Monday- Sat AM Update
During the winter storm last Wednesday, the NAM-WRF did very well in predicting the precipitation type. (The GFS was too warm.)
Last night's NAM (and GFS) has sleet and freezing rain arriving late Sunday afternoon and continuing through Sunday night into Monday morning. Mid morning on Monday, light sleet and rain changes back to snow with some accumulation possible.
Like the last storm, the amount of snow is going to be less important than the difficult travel conditions expected during late Sunday into Monday.
Sat 2/24: Sunny. Windy and cold. High 39
Sun 2/25: Some sun very early, then cloudy with sleet and freezing rain likely starting between 2-4 PM. Icy conditions possible after sunset. High 35. Difficult driving conditions possible Monday morning.

posted: Feb 24 2007 at 8:20 am

[/weather/feb07] 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	Sat, 24 Feb 2007 Winter Storm Update- Sat PM Low pressure is expected to move across our area from the west late Sunday, with precipitation reaching us around 3-6 PM on Sunday. There are differences between the models, with the NAM-WRF model being much colder and wetter than the GFS. Let me go through the differences: While both models have precip starting late afternoon. The GFS is warmer aloft than the NAM- the NAM starts things as snow, while the GFS starts things as sleet. The GFS continues with sleet changing to freezing rain with a total precipitation of about 0.60 inches water, then back to snow flurries. The NAM, on the otherhand, has a change to sleet and some freezing rain, but has a changeover back to snow before daybreak Monday with greater storm development and snowfall amounts. The NAM has over 1.00 inch of water falling as a mix of snow, sleet and freezing rain, then with light snow showers possible into early Monday afternoon. The NAM has the rain/snow line right around Philadelphia...PHL airport has slightly warmer conditions than PNE airport and more snowfall north. Areas to the north and west may have a significant snowfall of 6+ inches with ice accumulation. Sun 2/25: Bright skies very early, then becoming cloudy with a mix of snow and sleet starting between 3-6 PM, changing to freezing rain later. Possibly 2-4 inches accumulation before a shift to mostly freezing rain with higher amounts north and west. Difficult driving conditions likely Monday morning, especially north and west. posted: Feb 24 2007 at 10:20 pm [/weather/feb07] permanent link Ice to Freezing Rain to Snow- Sunday thru Monday- Sat AM Update During the winter storm last Wednesday, the NAM-WRF did very well in predicting the precipitation type. (The GFS was too warm.) Last night's NAM (and GFS) has sleet and freezing rain arriving late Sunday afternoon and continuing through Sunday night into Monday morning. Mid morning on Monday, light sleet and rain changes back to snow with some accumulation possible. Like the last storm, the amount of snow is going to be less important than the difficult travel conditions expected during late Sunday into Monday. Sat 2/24: Sunny. Windy and cold. High 39 Sun 2/25: Some sun very early, then cloudy with sleet and freezing rain likely starting between 2-4 PM. Icy conditions possible after sunset. High 35. Difficult driving conditions possible Monday morning. posted: Feb 24 2007 at 8:20 am [/weather/feb07] 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.