Bermuda Weather Service Forecast Discussion

For Tuesday, January 21, 2025  20:00 UTC

FORECASTER - Kimberley Zuill 

NOWCAST: This Evening through Tonight
Plagued with low cloud hovering 400-800ft, patchy mist and spotty 
drizzle, today remained gloomy as light to moderate NE winds gradually 
veered to become SE by late afternoon. As the nearby front continues 
to slowly lift out of our area while the cold front presses in from 
the distant west, winds will veer to the south and strengthen towards 
18-20 knots.  Satellite imagery teases us with an edge of clearing 
cloud about 50-70nm to our south, once winds begin to veer more southerly, 
we may see lifting of the cloud ceiling slightly, though as darkness 
falls temperatures will as well and mostly cloudy skies will prevail 
(the UK modeled cloud forecasts indicate that low cloud will linger 
for the remainder of the night). OPC pegs seas just beyond our reef 
at 6-8ft , which aligns with global wave models. 
WARNINGS: A Small Craft Warning is valid for Tonight when winds 
increase above 20 knots. 

AVIATION: MVFR/IFR conditions due to low ceilings and -RA BR improve 
to become VFR later overnight. RWY12 is active with winds 100-150 
degrees at 12-15kts expected to veer 180-200 degrees and increase 
15-18 knots. For more information visit: http://weather.bm/aviation/

SHORT TERM FORECAST: Wednesday through Thursday

Near zonal flow aloft briefly transitions to broad upper troughing 
on Wednesday and stirs up cyclogenesis along the surface frontal 
boundary just to our west, which perpetuates cloudy skies over our 
local area then strengthens SSW winds towards evening as the front 
nears. Strong winds may become gusty in and around showers, potentially 
reaching gale force for a short time, before veering and easing NE’ly 
moderate into Thursday. Completing a quick spin of the compass, winds 
veer to become SW late Thurs night. Moderate to rough seas are expected 
in the short term. 
WARNINGS: A Small Craft Warning is in effect for Wednesday through 
Thursday morning and may need extending. Slight chance of a thunderstorm 
advisory for Wednesday.

LONG TERM FORECAST: Friday through Saturday
A shortwave trough steers through the nearly zonal flow and deepens 
as it moves overhead. On the surface, a parade of weak surface lows 
continues to be spun up to our distant southwest creating another 
source of cloudy skies that thicken once in our region and lower 
to dampen us with periods of rain that become scattered showers late 
Friday night/early Saturday morning with the slight chance of isolated 
thunder. Moderate to strong SW’ly winds are expected to ease for 
a time before increasing once again with gusts towards gale force 
possible during the frontal passage then winds veer northerly late 
Friday night. Moderate to rough seas diminish slightly on Saturday.

WARNINGS: Small Craft Warning will be needed throughout the long 
term and a thunderstorm advisory is possible for late Friday night/early 
Saturday morning.