Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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000 FXUS62 KRAH 191852 AFDRAH Area Forecast Discussion National Weather Service Raleigh NC 150 PM EST Sun Feb 19 2017 .SYNOPSIS...
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An upper level trough will shift off the Carolina coast this afternoon. High pressure will build into the region behind the exiting low pressure system tonight through Monday night, then move off the East Coast on Tuesday.
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&& .NEAR TERM /THROUGH TONIGHT/... As of 130 PM Sunday... Quiet and mild weather tonight. The mid level trough is now shifting off the NC coast, and heights aloft will continue to rise over NC while high pressure builds in at the surface. A shallow layer of moisture that has managed to sneak past the mountains is generating a few high-based flat cumulus over the NW CWA this afternoon, but these will clear out later this afternoon with increased mixing of drier air within the boundary layer. Clear skies are expected tonight, with light winds slowly veering to northerly overnight. Expect lows fairly comparable to this morning`s readings, from around 40 to the mid 40s. -GIH && .SHORT TERM /Monday through Monday night/...
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As of 150 PM Sunday... The center of a high pressure ridge will drift across southern Quebec during this time frame while nosing southward through central NC. Dry and deeply stable air will persist through Monday, yielding mostly sunny skies, with just a few high clouds within fast northwesterly upper flow. Thicknesses will start out a bit lower than in the last couple of mornings, particularly over the NE sections of the forecast area, beneath the heart of the ridge axis. But values will still be well above normal, supporting highs from the upper 60s NE to the mid 70s in the far southern CWA. As the ridge axis shifts to our east Mon night, resulting in a southeasterly and southerly low level flow into central NC, low level moisture will steadily advect into the area, with increasing moist upglide focused around 290K across the western CWA overnight. Will have increasing clouds Mon night, especially in the west, with the relatively cooler ridge lingering in the NE CWA. Expect lows from the upper 30s NE ranging to the mid to perhaps upper 40s in the western CWA. -GIH
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&& .LONG TERM /TUESDAY THROUGH SATURDAY/... As of 255 AM Sunday... The upper level ridge over the eastern U.S. will shift east over the Atlantic as the next weather system approaches from the west. As the aforementioned system moves east, a closed low will break away from the northern stream trough late Tuesday and move east-southeast over the Gulf of Mexico on Wednesday (well south of the North Carolina). Meanwhile, the remnant northern stream trough will move over Central NC. The strength of the trough and whether it will generate light rain is still in question, however a slight chance for light rain cannot be ruled out Tuesday Night into Wednesday. Regardless, accumulations should be minimal as the best moisture will be well south of the area. At the surface, the high that had been ridging into the region will push eastward off the Mid-Atlantic coast on Tuesday, resulting in a more southeasterly then southerly return flow setting up over Central NC. The lingering dry air over the region may help keep rain from reaching the ground Tuesday night. Warm advection will increase as the southerly flow increases, resulting in a moderating temperature trend for Tuesday through Friday night. With the continued surge of warm air and the frontal passage not expected until the weekend, temperatures will remain well above normal through Friday night (highs in the mid to upper 60s Tuesday, increasing into the mid 70s Wednesday through Friday. Lows will follow a similar trend, upper 40s Tuesday night into the low to mid 50s by Friday night). There are still significant model differences for Friday onward with respect to the timing of the frontal system and associated weather. Generally, expect increasing chances for rain, with the highest chances Friday Night/Saturday ahead of the front. Temperatures, particularly the overnight lows, will decrease behind the front. However, temperatures still appear to remain slightly above normal. && .AVIATION /18Z Sunday through Friday/... As of 1140 AM Sunday... High confidence in VFR cigs/vsbys at all central NC terminals through Monday afternoon. A few clouds based around 3500 ft AGL will pass near INT/GSO through early-mid afternoon today, but otherwise skies will be cloud-free as high pressure builds in from the NW. Surface winds from the NW may gust infrequently to 15-20 kts through this afternoon, subsiding by 22z. Looking beyond 18z Mon, VFR conditions will hold through Mon evening. As the high pressure ridge shifts off the East Coast, a return flow of low level moisture will bring a chance for sub-VFR cigs/vsbys late Mon night/Tue morning especially at Piedmont TAF sites (INT/GSO/FAY). We will see this chance for late-night and early-morning sub-VFR fog/stratus repeat areawide through the remainder of the work week. A few showers are possible late Tue night through Wed morning as a weak upper trough crosses the area, but VFR conditions should remain dominant. -GIH && .RAH WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...WSS/GIH NEAR TERM...Hartfield SHORT TERM...Hartfield LONG TERM...KCP AVIATION...Hartfield

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