Dry Early May Weather


Early May Weather
Observations from the Bermuda Weather Service. Temperature and dew point on top, wind direction on bottom. To the right of the yellow line, the relative humidity (indicated by how close together the temperature and dew point are) increases as winds settle out of a south-southeasterly (135-180°) direction.

April ended by clearing out a very warm and humid airmass that was accompanied by patches of fog that advected across the island. This left the start of May quite dry with northerly winds and a ridge of high pressure to the north. As the ridge shifted to the east of Bermuda, northerly flow gradually veered southerly bringing in more humid air. High pressure has remained centered generally to the east of Bermuda since the fifth of May maintaining humid south-southeasterly flow.

This setup is fairly common for this time of year: ridges of high pressure settling in near Bermuda bringing persistent settled and mild weather across the western Atlantic. The Bermuda-Azores high typically starts to build in during late-May/early-June to its July peak extent and intensity, prevailing winds come from the south and southwest with a warm and humid the norm.

This high pressure setup is generally effective at keeping rain-making frontal systems at bay. However, it appears the ridge extending across Bermuda might weaken enough to allow a weakening front to bring some showers to the island over Friday. High pressure then re-establishes itself with a return to more settled weather over the weekend. The weak front is unlikely to be able to bring any real change in the airmass and the warm humid weather should continue without much break.

May is typically one of the driest months in Bermuda. Long periods without much rainfall are characteristic of April through June. Water availability can become an issue when several such dry spells occur in one year – particularly so as water demand increases in the warm season.

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