10/20 – Brantly’s “Mostly Sunny” Tuesday Morning Forecast


The latest models show some moisture in the lower levels of the atmosphere today which looks sufficient to support small rain chances this afternoon over much of the coastal counties.  Dry conditions are otherwise expected through Wednesday morning and much of the area Wednesday afternoon. Highs today and Wednesday will be mostly in the mid 80s, and lows tonight range from the lower 60s well inland to around 70 at the coast.  Patchy fog will be possible early this morning mainly over western portions of the area and again late tonight over much of the area.

A broad upper level trough ejects over the northeastern United States as another broad based trough shifts across the northern U.S. and southern Canada during the period Wednesday night into Thursday night. The southwestern nose of a surface ridge of high pressure remains rooted over the southeastern U.S. as the parent high shifts across the northeastern U.S. through Thursday night.

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Moist southeasterly surface flow remains in place during the period, and can’t rule out isolated showers or thunderstorms during the night Wednesday along coastal counties of South Mississippi. Rain chances increase Thursday to around 40 percent to 50 percent with isolated thunderstorms are possible across the area. Rain chances decrease after sunset Thursday night with loss of daytime heating, but maintain a slight chance of rain and a few rumbles of thunder across the region, with 40 percent chance of rain remaining over the southern coastal counties.

Temperatures will remain similar to previous days, with lows Wednesday night in the upper 60’s inland to lower 70’s along the coast. Highs Thursday reach the middle 80’s for most locations, but will be contingent on extent of cloud cover over the region and any precipitation that can develop. Lows Thursday night are a repeat of the previous night, with upper 60’s expected inland and lower 70’s along coastal areas.