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Area Forecast Discussion
Issued by NWS Birmingham, AL
Issued by NWS Birmingham, AL
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580 FXUS64 KBMX 200639 AFDBMX Area Forecast Discussion National Weather Service Birmingham AL 139 AM CDT Sat Jul 20 2024 ...New AVIATION... .SHORT TERM... (Tonight through Sunday) Issued at 742 PM CDT FRI JUL 19 2024 Several features were acting in concert to produce showers and thunderstorms over the area this evening. A quasi-stationary front was located in the vicinity of I-20 draped west to east. Another trough was located west to east near the southern end of the area. Aloft, the main longwave trough remains west of the area while a short wave trough was interacting with the front and ample moisture. It appears there is a low over Mississippi that will also aide forcing and lift. A large part of Central Alabama will receive rainfall overnight with a few places receiving 2-3 inches in a short period of time. Made some adjustments to the pop areas overnight, with a gradual decrease west. It appears that rain chances remain quite high on Saturday. The quasi-stationary front should remain just immediately north and we stay in the high moisture zone. Some leftover boundary interactions, potential instability, and a continual supply of deep moisture will give most locations rain on Saturday. 75 Previous short-term discussion: (This evening through Saturday) Issued at 105 PM CDT FRI JUL 19 2024 Tonight. Little change in the synoptic pattern is forecast as robust ridging prevails out west and the longwave trough lingers over the Mid-South. More disturbances are forecast to move northeast over the area, resulting in continued mid and upper-level support for lingering showers and a few storms overnight. The diffuse surface front looks to stall across the area tonight before lifting back northward as a warm front overnight. Coinciding with this movement, some broad general consensus is noted among the available modeling members for higher PoPs generally along the more populated Interstate 20 corridor. Training activity will need to be monitored for potential localized water ponding and pooling in poor drainage areas. Expect mostly cloudy skies overnight with lingering showers and some thunderstorms across the area. Some patchy fog will be possible across the northern portions of the area before sunrise on Saturday. Winds will become southeast at 3-6 mph overnight. Low temperatures will range from the upper 60s north to the low 70s south. Saturday. Longwave mid-level troughing will persist over the Mid and Lower Mississippi River Valley Region on Saturday. More mid-level disturbances are depicted to move east over the south-central portions of the area through the day. The surface front will remain to the north and west of the area during the day Saturday. Look for mostly cloudy skies with scattered showers and some thunderstorms across the area, becoming numerous during the afternoon and into the early evening with highest chances across the southeast half of the area. Winds will be from the south at 4-9 mph. High temperatures will range from the mid 50s far north and in the higher terrain east to the upper 90s far west and far south. 05 && .LONG TERM... (Saturday night through next Thursday) Issued at 135 PM CDT FRI JUL 19 2024 Above average rain chances are expected to continue into the next week as we remain in this anomalously active blocking pattern. Central Alabama will be trapped in between broad ridging extending west from the western Atlantic into the Gulf of Mexico, and broad troughing extending south from the Great Lakes region into the Southern Plains. This will place us within a continuous stream of moist, southwesterly flow which will favor daily opportunities for scattered to numerous showers and storms and temperatures that will likely stay in the 80s each day. The activity should generally favor diurnal trends in which the highest coverage will be during the afternoon, but some showers could be ongoing each morning as well due to the upper-level support from the trough. There are signals that the trough could begin to break down towards the end of the week as the ridge slowly builds westward which could bring our daily PoPs back down to more seasonable ranges beyond the next 7 days. 86/Martin && .AVIATION... (06Z TAFS) Issued at 120 AM CDT SAT JUL 20 2024 We remain in a wet and unsettled pattern through the TAF period. We are currently at our slow point for the forecast. To start there are some TSRA in the east parts of C AL that are moving NE TWD GA. Have a TSRA tempo for ANB thru 9z. However, guidance is showing multiple waves of SHRA/TSRA off/on thru the forecast with the most widespread activity expected this afternoon. We have MVFR stratus already at ASN/ANB and some lower IFR stratus at TCL. This stratus should fill in some with BHM/EET getting at least MVFR stratus over the next couple of hours. At this time left out at MGM outside of convection. Winds should be fairly light outside of convection. If you have enough mixing for 5-7kts, then S-SE should be the direction. 08 && .FIRE WEATHER... A rainy pattern is expected to continue through the weekend and into the early part of next week. Generally light winds expected aside from thunderstorm wind gusts. The humid airmass will keep minimum relative humidity values in the 60 to 80 percent range. && .PRELIMINARY POINT TEMPS/POPS... Gadsden 85 70 85 69 / 70 50 70 50 Anniston 84 72 83 71 / 70 60 70 50 Birmingham 85 72 85 71 / 70 50 70 50 Tuscaloosa 87 73 85 72 / 70 40 70 40 Calera 84 72 84 72 / 70 50 70 50 Auburn 87 72 85 72 / 70 70 70 50 Montgomery 87 73 86 72 / 70 60 70 50 Troy 88 72 87 71 / 70 60 70 40 && .BMX WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...75/05 LONG TERM....86/Martin AVIATION...08