Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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000 FXUS62 KRAH 230657 AFDRAH Area Forecast Discussion National Weather Service Raleigh NC 255 AM EDT SUN OCT 23 2016 .SYNOPSIS... High pressure will continue to build over the SE US today and tonight. This high will weaken as shift south of the area on Monday, in advance of a dry cold front moving through the area Monday evening. && .NEAR TERM /THROUGH TONIGHT/... As of 245 AM Sunday... In the wake of the upper low lifting northeast into eastern Canada, rising heights aloft and associated strong subsidence warming will allow for wall-to-wall sunshine. Surface High pressure centered over the Lower MS Valley this morning will shift east and weaken across the SE US this afternoon and tonight as a weak sfc trough develops in the lee of the Appalachians. Resultant low-level swly flow will help to bolster temps slightly, with uniform afternoon temps warming into the upper 60s/near 70, very close to the 30-yr average for late October. Not as chilly tonight, with lows in the mid to upper 40s. && .SHORT TERM /MONDAY AND MONDAY NIGHT/... As of 245 AM Sunday... A series of shortwaves diving through the back-side of the upper low over eastern Canada and attendant upper level trough extending across the eastern US will push a dry cold front through the area late Monday afternoon/evening. In fact, west-northwesterly downslope flow preceding the moisture-starved front will make it hard-pressed for even a few clouds to accompany the front. As such, we will see another day of unlimited sunshine with temperatures warming into the mid to to upper 70s(south)ahead of the front Monday afternoon. Modest CAA Monday evening/night on the leading edge of Canadian high pressure building into the area from the NW will support lows in the lower 40s north to mid/upper 40s south. && .LONG TERM /TUESDAY THROUGH SATURDAY/...
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As of 255 AM Sunday... Cool and dry air will spread south and into the area Tuesday and Wednesday in northerly flow as Canadian high pressure ridges down the Atlantic coast. Highs will top out in the mid to upper 60s both days with Wednesday mornings low in the low to mid 40s. The progressive surface ridge will move east and allow winds to veer east and then southerly...initiating warm and moist advection by Thursday. Highs will be on the uptick Thursday, with highs across the south in the lower 70s, while the northern tier may not climb out of the mid 60s. An amplifying upper trof and surface cold front will move across the area Thursday night/Friday. With moisture advection ongoing, would expect showers in the east by Thursday afternoon spreading into the east Thursday night. Details are still murky but increasing confidence in the arrival timing due to hints of model consensus justify raising PoPs. Front should be east of the area on Friday...shutting off moisture advection to limit shower coverage to widely scattered. Highs Friday and Saturday return to near seasonable upper 60s to lower 70s with morning lows around 50.
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&& .AVIATION /00Z SUNDAY THROUGH THURSDAY/... As of 135 AM Saturday... Rising heights aloft and associated strong subsidence in the wake of the trough lifting northeast out of the region, while surface high over the lower MS Valley builds east over the Southeast will support a continuation dry VFR conditions through the period. Light and variable winds overnight will become swly during the day on Sunday as a weak surface trough develops in the lee of the mtns. Looking Ahead: Dry VFR conditions are expected to dominate through Wednesday. The next chance for sub-VFR ceilings will arrive Thursday afternoon as a cold front and attendant showers approach the area from the west. && .RAH WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...CBL NEAR TERM...CBL SHORT TERM...CBL LONG TERM...mlm AVIATION...BS is the U.S. government's official web portal to all federal, state and local government web resources and services.