065 FXUS62 KRAH 120805 AFDRAHArea Forecast Discussion National Weather Service Raleigh NC 405 AM EDT Fri Sep 12 2025
.SYNOPSIS... High pressure centered to our north will extend down through the Mid Atlantic and the Carolinas through the weekend, although a northeasterly wind flow and passage of an upper level trough into the region will bring periods of clouds each day.
&&
.NEAR TERM /TODAY AND TONIGHT/... As of 355 AM Friday...
Surface high pressure centered over southern Quebec extends south into the Appalachians and Mid-Atlantic, bringing continued NE low- level flow to central NC. With mostly clear skies and surface winds turning very light to calm, satellite night fog imagery along with current observations show an area of fog spreading south through the NE Piedmont. Several ASOS/AWOS sites including KRDU, KHNZ, KLHZ and KTTA are already reporting visibilities in the one quarter to one half mile range. High-res guidance including the HRRR depicts this fog continuing to spread SSW overnight. There is some uncertainty in how far it will reach, and the 00z HREF mean has a notable increase in its extent compared to the 12z run. Some reduced visibilities are possible anywhere in central NC, but the highest probabilities for dense fog are across the NE Piedmont and northern Sandhills. Any fog will lift and dissipate by mid morning. Use caution if you encounter dense fog when driving early this morning.
A positively-tilted mid/upper trough is currently evident on water vapor imagery from the OH Valley into the Deep South. It will slowly move east across central NC today and tonight, with a ridge building over the Southern Plains. But with surface high pressure still ridging down from the north and below-normal PW values, only a period of increased cloudiness is expected. Persistent NE flow will keep high temperatures near to a few degrees below normal, in the upper-70s to lower-80s. Tonight`s lows will mostly be in the mid-to- upper-50s (perhaps lower-50s in the usual cool spots) with clear skies and decent radiational cooling.
&&
.SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/... As of 400 AM Friday...
Surface high pressure will continue to ridge down from the Canadian Maritimes on Saturday and Saturday night. Looking aloft, the mid/upper trough will remain anchored near the Southeast US coastline, keeping any rain chances right at the coast or offshore, as below-normal PW values persist across central NC. Only some mid and high clouds are expected, mainly in the east. Continued NE low- level flow and similar low-level thicknesses to Friday mean another day of slightly below normal temperatures is expected, with highs in the upper-70s to lower-80s. Saturday night`s lows will again drop into the 50s under mostly clear skies.
&&
.LONG TERM /SUNDAY THROUGH THURSDAY/... As of 205 AM Friday...
* Near-normal temperatures likely, with the potential for isolated to scattered showers possible in the east midweek.
Surface ridging and high pressure should generally continue to dominate over central North Carolina for much of the long term period. Temperatures on Sunday and Monday should be near to slightly above normal. This equates to maximum temperatures reaching the low- to-mid 80s each afternoon and lows each night in the upper 50s to low 60s. A dry backdoor cold front looks to move through the region Monday with surface high pressure building back in behind it. This should allow temperatures to drop back into the mid 70s to low 80s each afternoon Tuesday though Thursday. The rain forecast for Tuesday through Thursday has trended somewhat wetter in the east, as models and their ensembles have started coming into better agreement of a coastal system potentially bringing isolated to scattered showers into the eastern regions of the CWA. However, it is still unclear where the system will form and how far inland rain will be able to spread.
&&
.AVIATION /06Z FRIDAY THROUGH TUESDAY/... As of 230 AM Friday...
24 Hour TAF Period: Surface high pressure extending into the region from the north and NE low-level flow will result in a threat for sub- VFR visibilities from fog overnight across central NC, as winds are very light to calm and skies are mostly clear. Some scattered to broken clouds around 6-10 kft continue across the far NW and far east, but they are beginning to diminish and move out of the area. Thus MVFR to IFR to LIFR visibilities from fog will be possible at any of the TAF sites into early morning, with the best chance during the usual 09z-13z timeframe. The greatest confidence is at KRDU according to guidance and latest observational trends, which depict an area of fog currently over the far NE Piedmont (including KHNZ, KLHZ and KTDF) moving south over the next few hours. This is followed by KFAY/KRWI, which guidance generally depicts to be on the edge of the densest fog, and lastly INT/GSO. Model soundings and current observations indicate this will be more of a fog threat vs low stratus, but some IFR/LIFR ceilings still can`t be ruled out. Any fog will lift and dissipate by mid-morning, with VFR conditions prevailing the rest of the day.
Outlook: Mostly VFR conditions are expected into early next week. Ridges of high pressure extending in from the north will dominate at the surface, although a few more clouds and gusty winds are possible late Fri with passage of an upper level trough into the area. A coastal system may bring scattered showers early next week, best chance in the east, but models differ and it is too early to specify details at this time.
&&
.RAH WATCHES/WARNINGS/ADVISORIES... None.
&&
$$
SYNOPSIS...Hartfield NEAR TERM...Danco SHORT TERM...Danco LONG TERM...Helock AVIATION...Danco/BSD/Hartfield
NWS RAH Office Area Forecast Discussion