Back To Home
The Story Behind the Weather - By Forecaster John
Ensworth M.S. -
The Discussion of Weather Events Daily for Philadelphia and Pennsylvania
Last updated: 11/22/2003 10:19 PM
Good Morning Philadelphia!
I'm glad to announce that these discussions will continue until at least the end of this Year!. I have the needed server space.
In short: Dry and warm through the weekend, then rain and colder weather around Tuesday. This still holds.
Due to a CRASH of personal responsibilities (teaching 2 classes at once in 3 days - astronomy and meteorology) - I need to hit the bed ...RIGHT NOW!
I'll see you again Monday as the next front approaches.
Sorry.
Meteorologist John Ensworth
Surface Station sky cover color key:
Flight category definitions:Category | Ceiling | Visibility | |
---|---|---|---|
Low Instrument Flight Rules LIFR* (magenta circle) |
below 500 feet AGL | and/or | less than 1 mile |
Instrument Flight Rules IFR (red circle) |
500 to below 1,000 feet AGL | and/or | 1 mile to less than 3 miles |
Marginal Visual Flight Rules MVFR (blue circle) |
1,000 to 3,000 feet AGL | and/or | 3 to 5 miles |
Visual Flight Rules VFR+ (green circle) |
greater than 3,000 feet AGL | and | greater than 5 miles |
*By definition, IFR is ceiling less than 1,000 feet
AGL and/or visibility less than 3 miles while LIFR
is a sub-category of IFR. +By definition, VFR is ceiling greater than or equal to 1,000 feet AGL and visibility greater than or equal to 3 miles while MVFR is a sub-category of VFR. |