Weather Sites Sat. July 12

Low pressure offshore combined with jetstream overhead brings increasing cloudiness, high instability, unflyable south winds and risk of thundershower late in the day.

Surface winds SSW@<20km/hr (intermediate).
Winds aloft@3000ft@170D@30km/hr (SSE, advanced).
Winds aloft@6000ft@190D@40km/hr (SSW, unflyable).
Jet stream over Vancouver, Pemberton, Chilliwack, Seattle airspace.

Lapse rate@3.5D/1000ft (ballistic!)

Recommendation: Bridal Falls in strong leeside conditions, please don't risk flying there. Generally a bad idea to fly with powerful low pressure compounded wiht jetstream overhead. Watch for rapidly switching and accelerating winds, overdevelopment etc.

Name:	Dion
Date/Time:	Sat, July 12, 2003 at 10:15:05 AM PDT
Score:	5
Subject:	Weather Sites Sat. July 12
Message:
Low pressure offshore combined with jetstream overhead brings increasing cloudiness, high instability, unflyable south winds and risk of thundershower late in the day. Surface winds SSW@<20km/hr (intermediate). Winds aloft@3000ft@170D@30km/hr (SSE, advanced). Winds aloft@6000ft@190D@40km/hr (SSW, unflyable). Jet stream over Vancouver, Pemberton, Chilliwack, Seattle airspace. Lapse rate@3.5D/1000ft (ballistic!) Recommendation: Bridal Falls in strong leeside conditions, please don't risk flying there. Generally a bad idea to fly with powerful low pressure compounded wiht jetstream overhead. Watch for rapidly switching and accelerating winds, overdevelopment etc.