Area Forecast Discussion
Issued by NWS Blacksburg, VA

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000 FXUS61 KRNK 200543 AFDRNK Area Forecast Discussion National Weather Service Blacksburg VA 143 AM EDT Fri Oct 20 2017 .SYNOPSIS... A large area of high pressure will remain over the eastern part of the country this week before slowly sliding off the coast on Saturday. This will keep skies mostly sunny and allow temperatures to warm to above normal levels. Early next week, a strong cold front and deep upper trough will approach from the Midwest bringing widespread rain showers followed by much cooler temperatures. && .NEAR TERM /THROUGH TODAY/...
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As of 100 AM EDT Friday... No major changes anticipated for the remainder of the overnight period. Have made note of some cirrus clouds heading south through the area, but the vast majority of these are on the thin side, and will not contribute much to apparent cloud cover. Have adjusted hourly temperature, dew point and wind grids to better match the current observations and expected trends through the remainder of the overnight period. As of 910 PM EDT Thursday... Other than for some passing thin cirrus from the north around upper ridging west of the mountains, expecting another clear and cool overnight under surface high pressure. However temps and dewpoints are again a bit higher which should help alleviate much of the frost threat by dawn despite continued good radiational cooling. Still appears that some of the deeper valleys could again see a late night coating of frost so included a bit more in spots out west. Also nudged lows down some given such dry air in place, which puts most of the mountains down in the 30s, with upper 30s/lower 40s east. Previous discussion as of 220 PM EDT Thursday... Our string of pleasant fall weather will continue through the end of the workweek as a large area of high pressure remains in place across the eastern US. Temperatures tonight will be a bit warmer than last night and with dew points creeping up coverage of valley fog may be greater. Look for lows generally in the mid 30s to around 40 degrees with some cooler readings in the valleys and some spotty frost. Friday will be sunny and pleasantly warm with above normal temperatures as highs reach the middle and upper 70s east of the Ridge, low/mid 70s to the west.
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&& .SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/... As of 230 PM EDT Thursday... Big ridge of high pressure over the southeast Friday night exits to the east Saturday night as upper trough digs over the central U.S. Still looking at dry weather with increasing temps through the period. Clouds increase by late Saturday into Saturday night as the low level flow turns more south to southwest. && .LONG TERM /SUNDAY THROUGH THURSDAY/... As of 230 PM EDT Thursday... The forecast has changed a little compared to 24 hours ago, namely a slower onset of showers as models are trending slower as the upper pattern becomes more amplified. Sunday into Sunday night is going to be mainly dry and milder, but cannot rule out some showers forming in an upslope se flow over the NC mountains/far SW VA Blue Ridge late Sunday night. Monday, low pressure along the main front moves from the MS/AL border north to Ohio. Should see an uptick in threat of showers mainly in the mountains to foothills. Still mild/warm with highs ranging from the mid to 60s to around 70 west, to lower to mid 70s east. Appears differences in models remains beyond Monday but overall looks like colder air will be somewhat delayed and holding onto front in the area Tuesday with best chance of showers late Monday night through the day Tuesday. Euro solution more phased at 5h than GFS but still suggests front shifting east by Wednesday morning with less of a breeze than it looked like yesterday, but still looking at some gusty conditions Wed but more in the 15-25 mph range, mainly in the mountains/foothills. Rain cooled air will bring temperatures back down to normal Tuesday with highs from the 60s west, to around 70 east. Some upslope and upper trough induced showers across the west starting late Tue night into Wednesday as temperatures drop into the mid to upper 30s mountains Tue night with 40s elsewhere, and only rising to the 50s Wednesday west, to the lower to mid 60s east. Looks drier after Wednesday with high pressure sliding in from the Gulf Coast states and upper flow turning more west. && .AVIATION /06Z FRIDAY THROUGH TUESDAY/...
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As of 130 AM EDT Friday... Mainly VFR conditions are expected through the 24 hour TAF forecast period concluding at 06Z/2AM Saturday thanks to high pressure remaining over the region. The exception to this rule will be some IFR/MVFR fog/stratus development later tonight into early Friday morning mainly with in the mountain and river valley regions. Any sub-VFR conditions will improve to VFR by the mid to late morning Friday. Extended Aviation Discussion... High pressure will remain over the region through Sunday with generally VFR conditions expected, outside the usual late night/early morning patchy river and mountain valley fog. A deep upper trough and associated strong cold front will move into the region from the west by Monday promising a period of sub-VFR conditions in rain/showers along with increasing wind. Colder, blustery, unsettled weather with perhaps largely MVFR conditions across the mountains will linger through the later half of next week as an upper trough cuts off across the central Appalachians.
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&& .RNK WATCHES/WARNINGS/ADVISORIES... VA...None. NC...None. WV...None. && $$ SYNOPSIS...RAB NEAR TERM...DS/JH/MBS SHORT TERM...WP LONG TERM...WP AVIATION...DS/JH/MBS/RAB

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