Showers Tomorrow; Cool, Dry Air Rolls Into The State Wednesday

| September 20, 2021 @ 3:09 pm

RADAR CHECK: The most widespread rain this afternoon is across the northeast part of Alabama… otherwise showers are widely scattered across the state with a mix of sun and clouds. Temperatures are mostly in the 80-85 degree range… the average high for September 20 at Birmingham is 85. We will maintain the chance of scattered showers across the state tonight; the flash flood watch for the northern half of Alabama is set to expire at 7:00 this evening.

Tomorrow will be another day with more clouds than sun, and a few passing showers or storms are likely during the day. The high will be in the low to mid 80s.

BIG CHANGE: A cold front will blast through Alabama early in the day Wednesday; showers will end by mid-morning, and the sky becomes mostly sunny by afternoon with lowering humidity levels and a fresh north wind of 10-20 mph… gusting at times to 25/30 mph. The big change happens right on cue; the autumnal equinox is Wednesday afternoon at 2:20p CT… this is when the sun is directly over the equator, and we have approximately 12 hours of daylight and 12 hours of darkness. The “official” beginning of fall.

This cool, dry airmass will settle into the state, and set the stage for delightful early fall weather Thursday through the weekend. No rain… sunny pleasant days and clear cool nights. Temperatures will drop into the 45-55 degree range Thursday morning, and most places across North Alabama will be in the 40s early Friday; easily the coolest air so far this season. The high Thursday and Friday will be in the mid 70s, followed by low 80s Saturday, and mid 80s Sunday. Perfect weather for high school and college football games across the Deep South.

NEXT WEEK: Dry weather will likely continue through the week. A cold front could bring a few isolated showers late Wednesday or Thursday, but with limited moisture it looks like most places will stay rain-free. Highs during the week will be mostly in the low 80s, with lows in the 50s and low 60s. See the Weather Xtreme video for maps, graphics, and more details.

TROPICS: Tropical Storms Peter and Rose in the Atlantic are weak, disorganized, and no threat to land. A tropical wave in the eastern Atlantic has a high chance of becoming a tropical depression or storm during the next few days as it moves to the west/northwest, but this one is expected to gain latitude late this week and seems to be no threat to the U.S.

We see no systems threatening the U.S. or the Gulf of Mexico over the next 7-10 days.

ON THIS DATE IN 1909: A large and deadly Category 3 hurricane made landfall near Grand Isle, Louisiana during the late evening hours. The states of Louisiana and Mississippi showed catastrophic damage resulting in 371 deaths.

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Category: Alabama's Weather, ALL POSTS, Weather Xtreme Videos

About the Author ()

James Spann is one of the most recognized and trusted television meteorologists in the industry. He holds the AMS CCM designation and television seals from the AMS and NWA. He is a past winner of the Broadcast Meteorologist of the Year from both professional organizations.

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