textproduct: Huntsville

KEY MESSAGES

Updated at 330 AM CDT Sun Sep 13 2026

- NWS HeatRisk values will largely be in the Moderate category during the forecast period, although Major category is expected mainly for portions of NW Alabama and urban areas Monday through Wednesday.

NEAR TERM

(Today) Issued at 330 AM CDT Sun Sep 13 2026

Mainly high-level clouds are present across the central/southern portions of the TN Valley this morning with temperatures ranging from the mid 60s in southern Middle TN to the low 70s primarily in northern AL. Calm winds and partially clear sky conditions have allowed for light fog formation in areas with recent wet soils caused by showers yesterday. While not as prevalent as in the southern/central Appalachians, shallow light fog was observed in satellite imagery in portions of the narrow valleys in the east and along the Elk River Valley primarily. Further patchy fog development is anticipated before daybreak especially in areas where rainfall occurred yesterday, but is not expected to be dense or problematic. Any fog present will begin to dissipate rather quickly after sunrise.

A ridge of high pressure that has been centered over the SW will expand eastward today, as the pattern and environment become much less conducive for shower/storm development over the TN Valley. With that said, a small shower/storm could not be ruled out especially over the plateau, but chances are too low to mention in the forecast at this time. Otherwise, with the building of the ridge across the area, the main story today will be the increase in heat once again, which will strengthen in the coming days. The combination of heat index temperatures along with HeatRisk values and wet-bulb globe temps likely will not reach thresholds for consideration of a Heat Advisory today. Nevertheless, those particularly susceptible to the impacts of heat should consider adequate cooling and hydration today.

SHORT TERM

(Sunday night through Tuesday night) Issued at 859 PM CDT Sat Sep 12 2026

Dry weather will continue through the short term period as the aforementioned ridge tracks east and low level flow is more influenced by drier air over the Appalachians rather than a fetch from the Gulf. The main impact in the short term will continue to be the heat, with afternoon highs reaching the mid to upper 90s, especially along and west of I-65. Moderate to Major HeatRisk conditions will exist through Tuesday with warm overnight lows in the lower 70s providing little relief and compounding the heat danger. Dewpoints in the lower 70s will bring heat indices up to the 100-106 degree range each afternoon. While these conditions do not appear to be widespread enough to warrant an Advisory at this range, trends will continue to be monitored in case heat indices around that 105 degree threshold become more likely. Please continue to practice heat safety, summer is not over yet!

LONG TERM

(Wednesday through Saturday) Issued at 859 PM CDT Sat Sep 12 2026

The start of the long term will offer much of the same as ridging remains anchored over the TN Valley and high pressure sets up along the eastern seaboard. With high pressure both at the surface and aloft, dry and hot conditions will prevail with highs soaring into the 90s each afternoon. ESE flow off the Atlantic will keep dew points in the high 60s to low 70s. This will push heat indices near and above triple digits with heat being the primary concern through the long term forecast. Make sure to continue to practice proper heat and sun safety.

By Friday, models begin to diverge as the ridging over the SE looks to retrograde. A weak front looks to approach from the NW however significant disagreement exits in the models regarded if and when this front could come through. As such, ensemble spread increases in Friday and significantly on Saturday regarding our high temperatures, nearly nearly a ten degree spread widely shown in the models. Should the front near by the end of the week, this would increase cloud cover and rain chances, and decrease temperatures. If the front stalls to our NE, hot and humid conditions will prevail through Saturday. Please check back for updates.

AVIATION

(06Z TAFS) Issued at 1240 AM CDT Sun Sep 13 2026

A swath of shower activity occurred just adjacent to KHSV yesterday, bringing heightened chances for fog development there overnight. Satellite imagery is beginning to show evidence of lgt fog formation along those swaths, thus, a period of MVFR fog was included at KHSV between 10-12Z. The timing and intensity are uncertain, and may require amendments for the KHSV TAF before 12Z. Otherwise, VFR conditions are expected at TAF sites over the next 24 hours.

HUN WATCHES/WARNINGS/ADVISORIES

AL...None. TN...None.