WEDGE AFFECT: A tale of two states as the “wedge” or cold air damming from the east continues to be the dominant feature impacting the weather in Alabama. Generally east of Interstate 65, temperatures are well-below average with widespread 60s and 70s, more clouds, and widespread showers and storms.
A flood watch remains in effect for much of eastern Alabama. West of 65, showers and storms are more scattered in nature, and temperatures are in the mid and upper 80s. Not much change in the weather tomorrow, but things will begin to change after tomorrow.
BIRMINGHAM ALMANAC: For August 4th, the average high for Birmingham is 91° and the average low is 72°. The record high is 103° set in 1947, while the record low is 56° set in 1950. We average 0.16” of precipitation on this date and the record value is 2.27” set in 1957.
USA BRIEF: Wildfire smoke continues to result in poor air quality from the Upper Midwest into the Northeast. Dangerous heat and fire weather concerns for portions of the Four Corners region into the central Great Basin and Rockies. Heavy rainfall and flash flooding possible for the Southeast through today. Strong to severe thunderstorms for the Southern Plains with severe wind gusts and large hail possible.
REST OF WEEK: Through the week, we slowly return to routine August weather for Alabama with temperatures climbing into the upper 80s and lower 90s by the end of week. The days will feature a mix of sun and clouds and showers and storms become more isolated in nature; rain chances will be in the 30-40% range.
ROUTINE AUGUST WEEKEND: Afternoon highs in the upper 80s and lower 90s with some afternoon and evening showers and storms on a daily basis. Nothing unusual for mid-August in Alabama.
IN THE TROPICS: All of a sudden, the tropics have decided to get active, but good news, no threat to Alabama, or the U.S. from any of the features we are watching.
TROPICAL STORM DEXTER: A classic fish storm, at 1100 AM AST, the center of Tropical Storm Dexter was located near latitude 35.2 North, longitude 67.4 West. Dexter is moving toward the northeast near 14 mph. A similar northeastward or east-northeastward motion is expected over the next few days. Maximum sustained winds are near 45 mph with higher gusts. Some slight strengthening is forecast during the next couple of days, but Dexter is likely to become a post-tropical cyclone by the middle to latter portion of this week. Tropical-storm-force winds extend outward up to 105 miles from the center. The estimated minimum central pressure is 1002 mb (29.59 inches).
Elsewhere, in the Central Tropical Atlantic a tropical wave moving off the west coast of Africa is currently producing only limited shower activity. In a few days, environmental conditions are forecast to become favorable for gradual development of this system, and a tropical depression could form by the latter portion of this week as it moves generally west-northwestward across the central tropical Atlantic. Formation chance through 7 days…medium…50 percent.
Also, off the Southeastern United States, a broad area of low pressure is forecast to develop in a couple of
days a few hundred miles off the coast of the southeastern United States. Some gradual development of this system is possible during the middle or latter portion of this week as the system drifts slowly westward to northwestward. Formation chance through 7 days…low…30 percent.
The next names up are Erin and Fernand.
WORLD TEMPERATURE EXTREMES: Over the last 24 hours, the highest observation outside the U.S. was 122.7F at Ahwaz, Iran. The lowest observation was -104.1F at Dome C, Antarctica.
CONTIGUOUS TEMPERATURE EXTREMES: Over the last 24 hours, the highest observation was 117F at Tecopa, CA. The lowest observation was 28F at Foxpark, WY.
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