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The Story Behind the Weather -
By Forecaster John Ensworth M.S.

The Discussion of Weather Events Daily for Philadelphia and Pennsylvania

 Last updated: 04/25/2004 12:23 AM
 

Hello Philadelphia,

I have a great job prospect in Arlington, VA and will drop this discussion now since the Franklin Institute didn't re-open their position in the year since. 

Thanks for coming, reading and learning! 

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.