Area Forecast Discussion
Issued by NWS Huntsville, AL
Issued by NWS Huntsville, AL
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982 FXUS64 KHUN 010829 AFDHUN Area Forecast Discussion National Weather Service Huntsville AL 329 AM CDT Sat Jun 1 2024 ...New NEAR TERM, SHORT TERM, LONG TERM... .NEAR TERM... (Today) Issued at 329 AM CDT Sat Jun 1 2024 Light rain has been observed early this morning and will continue to increase in coverage as an upper shortwave lifts from central Missouri and into the Great Lakes region today. Ahead of this, moisture advection will increase as the sfc high over the Appalachians is pushed farther east, allowing PWATs to climb into the 1.6-1.8" range later this morning. As synoptic lift increases along this shortwave, numerous showers and embedded thunderstorms are expected today. Rainfall rates could be high at times, leading to localized flooding concerns, especially in low-lying and poorly draining areas. As the day progresses, there may be a few hours later this afternoon where an overlap of wind shear and instability could support a few strong to marginally severe thunderstorms capable of producing gusty to damaging winds. SPC has maintained the Marginal Risk (level 1 of 5) for today for damaging winds as SBCAPE values below 1000 J/kg is not supportive of large hail and the shear/instability profile is not supportive of tornadoes. Rain should start to lower in coverage later this afternoon as the trough axis shifts east of the area, removing the better synoptic lift from the Tennessee Valley. With that said, have maintained medium chance PoPs (40-60%) east of I-65 heading into the evening and lower (30-40%) PoPs west of I-65. Rainfall totals look to be highest over NW AL and could range from 1-2", but should remain less than 1" elsewhere. With cloudy skies and rain expected today, highs will be limited to the low to mid 70s this afternoon. && .SHORT TERM... (Tonight through Monday night) Issued at 329 AM CDT Sat Jun 1 2024 Rain chances will begin to decrease tonight and remain lower on Sunday, but still expect to see some scattered showers and embedded thunderstorms through the remainder of the weekend given the moist airmass in place. Low to medium chances (30-50%) for showers and storms are forecast on Sunday afternoon with afternoon highs a little warmer in the low to mid 80s. Will see a break in the rain by Sunday night into Monday morning, where the primary concern will be fog development overnight given the recent rainfall and light winds. Expect low chances (20-30%) for diurnally driven showers and storms Monday afternoon with highs climbing back closer to seasonal norms, topping out in the mid to upper 80s. Overnight lows will be in the mid to upper 60s through the short term period. && .LONG TERM... (Tuesday through Friday) Issued at 329 AM CDT Sat Jun 1 2024 An unsettled pattern will persist through mid week. Another shortwave will slide into the TN Valley on Tuesday bringing low/medium chances (30-50%) of showers and thunderstorms. Upstream, an upper level low will ride just north of the U.S/Canadian border and phase with a shortwave located in the Northern Plains on Wednesday. The associated sfc low will have a cold front extending all the way down the MS Valley. This set up will be slow to make eastward progress due to the blocky pattern just east of the Great Lakes. Prefrontal showers and storms will arrive on Wednesday and believe coverage and the threat for heavy rainfall will increase if another shortwave ends up scooting through vs staying off to our north. The front will push through some time on Thursday and POPs will taper off behind it. Timing still isn`t great on exactly when the front will move through,as this model cycle has it earlier on Thursday than yestrday`s run. Will monitor trends to adjust timing and storm hazards. Otherwise, daytime highs will run in the low/mid 80s with lows in the upper 60s ahead of the front. Behind the front on Friday, we won`t see a drastic temp change but will have highs in the lower 80s with lower humidity and lows in the lower 60s. && .AVIATION... (06Z TAFS) Issued at 916 PM CDT Fri May 31 2024 VFR conditions should continue through 8Z or 9Z at both terminals. Then expect -RA and MVFR CIGS to impact KMSL around 08Z and KHSV 09Z. Some -TSRA could start impacting either terminal between 10Z and 11Z. A tempo group for some heavier TSRA, which could drop VSBYS to 2 SM or less and CIGS around or below 1000 feet were included between 10Z and 15Z at the terminals. -RA with VCTS was kept for lingering activity at the terminals from 01/16Z until 02/00Z. This should allow CIGS and VSBYS to improve some and be primarily MVFR. By 02/00Z have ended precipitation (this may need to be tweaked in next issuance), while keeping CIGS less than 1000 feet. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...None. TN...None. && $$ NEAR TERM...25 SHORT TERM....25 LONG TERM....JMS AVIATION...KTW