James Spann forecasts more scattered showers, storms to start the work week from Alabama NewsCenter on Vimeo.

LAST DAY OF METEOROLOGICAL SUMMER: While this is the last day of meteorological summer, Alabama has some very hot weather during September. In fact, the hottest temperature on record in Alabama came on Sept. 5, 1925, when Centreville in Bibb County soared to 112 degrees. It doesn’t magically turn cooler on Sept. 1.

We project a high between 87 and 90 degrees today; the average high for Birmingham on Aug. 31 is 89. We expect a mix of sun and clouds, and scattered showers and thunderstorms will fire up this afternoon. Odds of any one place getting wet are about 1 in 2, and some of the storms over north Alabama could be strong. The Storm Prediction Center has defined a marginal risk (level 1 of 5) for about the northern half of the state for the afternoon and evening.

The main threat from the stronger storms will come from straight-line winds. Showers and storms will die down tonight once the sun goes down.

We don’t expect much change Tuesday — partly sunny with scattered showers and thunderstorms by afternoon; the high will be close to 90.

WEDNESDAY THROUGH FRIDAY: An upper ridge will strengthen over the region, and our weather trends hotter and drier. Look for partly sunny days, highs in the low to mid 90s and only isolated showers. Odds of any one spot getting wet on these three days will drop into the 15-25% range.

LABOR DAY WEEKEND: Highs will drop back into the mid to upper 80s over the weekend; a few scattered showers or thunderstorms will be possible. For now it looks like the higher coverage will be on Sunday, but it still won’t be a total washout.

NEXT WEEK: A big pattern change will bring a series of cold fronts into Alabama, with potential for a very nice taste of fall over the latter half of the week. Model data suggests highs will drop into the low 80s, with lows in the low 60s. There’s a good chance many north Alabama communities will dip into the 50s, based on the projected upper-air pattern.

TROPICS: The National Hurricane Center is monitoring four tropical waves this morning. One is over the African continent; it will emerge into the Atlantic by midweek. Another is in the central Atlantic between the coast of Africa and the Lesser Antilles. For now, both of these have a low chance of development over the next five days.

An area of low pressure (invest 90L) is a few hundred miles east of Jacksonville, Florida. This system has gradually gotten better organized during the past 24 hours but is producing only limited showers and thunderstorms. Additional development is expected and a tropical depression is likely to form by the middle of the week while the system moves northeastward or east-northeastward, initially parallel to the southeastern coast of the U.S. and then away from land. Upper-level winds are expected to become less conducive for further development on Wednesday.

And recent satellite imagery and satellite-derived wind data indicate that a broad area of low pressure associated with a tropical wave over the eastern Caribbean Sea has changed little in organization since Sunday. However, environmental conditions are expected to gradually become more conducive for development, and a tropical depression is likely to form during the next couple of days while the system moves moves westward at 15 to 20 mph. It looks like it will move into Central America later this week, where it will likely dissipate.

For now no systems are threatening the U.S. mainland, and the Gulf of Mexico remains quiet.

ON THIS DATE IN 1935: The most intense hurricane to make landfall was a modest tropical depression on this day. Called the Labor Day Hurricane, this storm went through phenomenal intensification to become a Category 5 hurricane by Sept. 2.

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