August Cold Front


An RGB Satellite Image from this morning with my annotations showing the cold front to the north of Bermuda as a blue line with flags, a stationary front as a red and blue line, a ridge of high pressure to the south of Bermuda as a light blue ridged line, and surface wind streamline segments as red arrows.
An RGB Satellite Image from this morning with my annotations showing the area of low pressure as a red ‘L’, its associated cold front to the north of Bermuda as a blue line with flags, a stationary front as a red and blue line, a ridge of high pressure to the south of Bermuda as a light blue ridged line, and surface wind streamline segments as red arrows.

An area of low pressure formed near the Outer Banks of North Carolina last weekend and has since tracked well to the north and is now to the distant northeast and headed eastwards. This non-tropical low formed along a stationary front that extended from the Gulf of Mexico, along the United States East coast, and out to sea north of Bermuda, and the low has since generally taken a track following the front, strengthening slowly as it went. It has strengthened enough to cause the stationary front to flex push southwards and head towards Bermuda as a cold front. This cold front should introduce increasing shower activity through today, clearing this evening as the front pushes to the south of Bermuda. A bit of thunder and lightning can’t be ruled out just yet in these showers.

It is fairly unusual for a cold front to pass through Bermuda in August. And, unlike a well defined or strong cold front where there is a definite exchange of airmass, expect only a slight wind shift and maybe a brief decrease in humidity behind the front.

These changes shouldn’t last for long – just as the front passes to the south of Bermuda, another system, moving off the US East coast, pulls the front northwards back across Bermuda bringing further rain and showers along with a return to a more humid airmass later this week. And, in another unusual turn of events, that same system may draw a cold front across Bermuda for the start of next week and should be monitored for unsettled weather. Some model indications show this front being much better defined than todays brining a definite exchange of airmass to one much less humid. It should be noted that fronts tend to go stationary near Bermuda this time of year bringing rain in excess.

Stay tuned to the Bermuda Weather Service for the latest official weather products for Bermuda, including watches, warnings, and advisories.

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