SAN FRANCISCO STATE UNIVERSITY WEATHER
An Activity of the SFSU Chapter of the American Meteorological Society
And the Department of Earth & Climate Sciences
WEATHER SUMMARY FOR THE SAN FRANCISCO BAY REGION
DATE:
VALID TIME:
Monday, April 20, 2015
10:00 AM PDT / 17:00 UTC
Normal High*:
Normal Low*:
650F
490F
Sunset Tonight:
Sunrise Tomorrow:
7:50 PM PDT
6:27 AM PDT
Record High*:
Record Low*:
910F
380F
(2009)
(1967)
WEATHER DISCUSSION FOR THE SAN FRANCISCO BAY REGION
A low-pressure system forming a closed low develops to the southeast of the San
Francisco Bay Area and moves northeast, while a high-pressure system is developing far from the
East Pacific, leading to on-shore winds and bringing moist air to the region. As the two pressure
systems move closer to each other, the pressure gradient increases. As this occurs, the distances
between isobars over the Bay Area will decrease (tighter packing), which results in strong winds.
With an upper-level trough approaching the Bay Area from the southwest, divergence of upperlevel winds and uplifting are expected, and a light chance for scattered precipitation exists for the
east and south part of the Bay Area through Wednesday to Thursday.
Location
CURRENT CONDITIONS FOR 10:00 AM PDT
Temp 0F:
Weather
SFSU
SANTA ROSA
NAPA
CONCORD
OAKLAND INTL AIRPORT
SAN FRANCISCO INTL AIRPORT
LIVERMORE
HAYWARD
SAN JOSE AIRPORT
SAN FRANCISCO DOWNTOWN
51
55
54
59
54
57
58
56
56
54
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Wind (mph)
SW 9
CALM
W8
W12
W6
W6
W5
NW 3
SE 3
SW 5
FORECAST:
TODAY: Overcast. Highs in the lower 60s. SW winds around 10 mph.
TONIGHT: Cloudy skies and high chance of fog. Low in the lower 50s. W winds around 15 mph.
TUESDAY: Cloudy skies, expecting fog in early morning. High in the higher 50s to lower 60s.
Low in lower 50s. W winds around 5 to 10 mph. stronger NW wind around 15 mph in the
afternoon.
WEDNESDAY: Mostly Cloudy. High in the lower 60s and lows in the lower 50s. NW winds 5 to
10 mph.
EXTENDED FORECAST:
THURSDAY THROUGH SATURDAY: Cloudy. Cold condition continuing in the San Francisco
Bay Area. Highs in the lower 60s and lows in the lower 50s. Stronger winds varies WNW in 15 to
20 mph
FORECASTERS: Yilin Lu, Andrew Dotson, Nick Christen
*Climatological information is for San Francisco International Airport (SFO).