textproduct: Huntsville

KEY MESSAGES

Updated at 1109 AM CDT Mon Jun 8 2026

- Excessive rainfall and life-threatening flash flood risk will persist through Tuesday.

- A Flood Watch is in effect until 8 PM today for much of north AL and all of southern middle TN.

- Heat Risk increases by late this week. Heat index values in the middle 90s to around 100 degrees Wednesday through Saturday.

NEAR TERM

(Rest of Today and Tonight) Issued at 1109 AM CDT Mon Jun 8 2026

A significant and potentially life-threatening flash flood threat continues across the Tennessee Valley today, particularly across portions of northeast Alabama where widespread flooding is already ongoing from the 2-8 inches of heavy rainfall we received yesterday.

Looking at the big picture, an approaching shortwave trough will provide additional synoptic-scale lift across the region today. Combined with abnormally high atmospheric moisture depicted by PWAT values near 2.2 inches and moderate instability with SBCAPE values between 2000 and 2500 J/kg, conditions will remain favorable for numerous showers and thunderstorms capable of producing extremely heavy rainfall rates.

The primary concern today is not necessarily the exact rainfall amounts, but rather how quickly additional rainfall will translate into runoff. Many locations across northern Alabama and southern middle TN received between 2 and 8 inches of rainfall yesterday, leaving soils saturated and most rivers/streams either elevated or overflowing their banks. As a result, virtually any rainfall that develops today will run off efficiently, leading to rapid water rises and the potential for life-threatening flash flooding. Convectively enhanced rainfall rates could exceed 2 to 3 inches per hour at times within stronger storms. Even brief periods of heavy rainfall could quickly overwhelm drainage systems, inundate roadways, and cause additional dangerous rises on creeks and streams. Residents across the Tennessee Valley should remain weather aware throughout the day and treat all Flash Flood Warnings as life-threatening situations. Use extreme caution if driving through rainfall, obey all road closures, and never attempt to drive through flooded roadways!

Rain should come to an end from west to east late this evening with a brief period of dry conditions before low rain chances start to creep back in across norther portions of the forecast area before sunrise. Please remember that any areas that flood today will likely remain that way overnight, leading to an increased threat to life due to lower visibility.

SHORT TERM

(Tuesday through Wednesday) Issued at 1109 AM CDT Mon Jun 8 2026

The aforementioned upper trough axis will begin to shift east of the area on Tuesday, resulting in low to medium chances for showers and storms particularly for areas east of I-65. With PWATs still near 2", additional heavy rainfall could worsen flood conditions. Due to the more scattered nature of these storms, the Flood Watch was not extended through Tuesday at this time but forecast trends will be monitored closely. Convection will become more diurnally driven during the mid-week period with rain chances capping near 30% Wednesday afternoon. The threat will begin to shift more toward dangerous heat during this time with afternoon heat indices approaching 100 degrees. Be sure to keep heat safety in mind for any outdoor plans later this week!

LONG TERM

(Wednesday night through Sunday) Issued at 1209 AM CDT Mon Jun 8 2026

The ridge across much of the southern and eastern CONUS will be dampened as a wave of energy rounds the base of a trough in southern Canada on Thursday and furthermore on Friday. On Friday, the associated sfc low will be north of the Great Lakes, but the cold front will drape down through the OH Valley and back into the Mid MS Valley. Some models have the cold front dipping toes into the TN Valley Friday night, while others are suggesting it stalls out north of us and never makes it in. Will stick with guidance for now with this, and that brings a medium chance (60%) of showers and thunderstorms Friday. Otherwise, we will be under high pressure throughout the rest of the extended forecast, but it won't feel like it. We'll be trapped in with plenty of moisture for diurnally driven convection each day (low to medium chances 20-50%).

We will also turn up the heat as temps reach the upper 80s/lower 90s on Thursday through Saturday and just in the upper 80s on Sunday. It is important to note that this set up will also push the heat index values into the upper 90s/lower 100s Thursday through Saturday. Will monitor trends, but right now values are below Heat Advisory Criteria. Regardless though, you will need to practice heat safety because we do not feel acclimated to the high heat and humidity for this long quite yet, so ensure that you stay hydrated and slow down to prevent heat related illnesses.

AVIATION

(18Z TAFS) Issued at 100 PM CDT Mon Jun 8 2026

MVFR to IFR conditions are forecast through the afternoon into early evening hours as heavy rain and thunderstorms move across the area that will result in poor vsbys during heavier showers. This activity should clear the area late this evening making way for VFR conditions overnight. IFR to LIFR cigs are forecast to return early Tuesday morning with low to medium chances for rain and storms.

HUN WATCHES/WARNINGS/ADVISORIES

AL...Flood Watch until 8 PM CDT this evening for ALZ001-005>010-016.

TN...Flood Watch until 8 PM CDT this evening for TNZ076-096-097.