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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, 28 May 2012
Philly Weekend Weather Update -Mon AM
High pressure will keep a southwesterly flow of very warm, humid air over us today. Summer-like conditions for the unofficial start of the summer season!
Yesterday, the NAM-NMM was correct in keeping the thunderstorms to our west. Last night, thunderstorms made it into upper Montgomery and far western Chester county, but dissipated by the time they reached Philadelphia.
Last night's high resolution NAM model predicts considerable thunderstorm activity in our area today, during the late afternoon and evening hours. This morning's NAM FOUS data shows an lifted index of -8, which indicates unusually high instability and can support heavy thunderstorm development. (We get heavy thunderstorms around here with lifted indexes of -4 to -6; the more negative, the greater the instability of the atmosphere. A lifted index as unstable as -8 isn't very common around here.) While the instability is very high, the vertical movement of the atmosphere doesn't become favorable until this evening.
Mon 5/28: Mostly sunny, very warm, humid. A good chance of moderate to severe thunderstorms late in the afternoon and evening. High 89.

posted: May 28 2012 at 12:02 pm

[/weather/may12] 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, 28 May 2012 Philly Weekend Weather Update -Mon AM High pressure will keep a southwesterly flow of very warm, humid air over us today. Summer-like conditions for the unofficial start of the summer season! Yesterday, the NAM-NMM was correct in keeping the thunderstorms to our west. Last night, thunderstorms made it into upper Montgomery and far western Chester county, but dissipated by the time they reached Philadelphia. Last night's high resolution NAM model predicts considerable thunderstorm activity in our area today, during the late afternoon and evening hours. This morning's NAM FOUS data shows an lifted index of -8, which indicates unusually high instability and can support heavy thunderstorm development. (We get heavy thunderstorms around here with lifted indexes of -4 to -6; the more negative, the greater the instability of the atmosphere. A lifted index as unstable as -8 isn't very common around here.) While the instability is very high, the vertical movement of the atmosphere doesn't become favorable until this evening. Mon 5/28: Mostly sunny, very warm, humid. A good chance of moderate to severe thunderstorms late in the afternoon and evening. High 89. posted: May 28 2012 at 12:02 pm [/weather/may12] 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.