Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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119 FXUS62 KRAH 221442 AFDRAH Area Forecast Discussion National Weather Service Raleigh NC 1045 AM EDT Sun MAY 22 2016 .SYNOPSIS...A strong upper-level low pressure area will settle over the area today through Monday, producing unsettled weather. Warmer and drier weather will follow from Tuesday through late week as the upper low moves offshore and high pressure builds across the area. && .NEAR TERM /through tonight/...
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As of 1045 AM Sunday... Little change required to the near term forecast. 12z upper air analysis depicts strong cyclonic flow over central NC with an upper level low positioned over the northern Mid-Atlantic states. Around this low are a series of vort axes, one which is crossing our region late this morning, triggering a band of scattered rain showers across the northern piedmont. This mid level feature will continue to drift to the east-southeast, triggering additional shower development in the coastal plain and eastern piedmont this afternoon. While the western piedmont will see little if any showers through mid afternoon, shower activity expected to increase late this afternoon, and more so this evening, as another vort axis approaches from the north. While instability is marginal and conditional, went ahead and added the mention of an isolated thunderstorm for this afternoon. The highest threat for thunder will be along and east of highway 1. Cloud cover expected to remain abundant this afternoon. This, along with scattered showers in the east, will hold temperatures down several degrees from normal high temps for late May. Max temps this afternoon should vary from around 70 north to the low-mid 70s south. Tonight, the approach and passage of the next vort axis will maintain a few showers across the region. The upper level low will drift south and settle overhead by early Monday. The pool of cooler air aloft will transfer to the south, resulting in overnight temps about 5 degrees cooler than last night. Min temps by early Monday should range from around 50 across the far north-northwest to the low-mid 50s south.
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&& .SHORT TERM /Monday and Monday Night/... As of 310 AM Sunday... The mid/upr closed low will continue to be the main player in our weather as it slowly moves from NE NC in the morning eastward and offshore by evening. Despite the mid-level cooling on the back side of the low, forecast soundings indicate only modest instability. Nevertheless, there should be enough mid/upr energy assoc with vort maxes rotating around the low to provide adequate support for scattered afternoon and early evening showers. Worth noting that these showers should be fairly brief with limited rainfall. Thanks to the ongoing northerly flow, below normal temps will continue. Highs from around 70 north to mid 70s s/sw. Lows monday night in the lower-mid 50s. && .LONG TERM /Tuesday through Saturday/... As of 245 AM Sunday... Through the work week: The upper level low and attendant trough will quickly move away from the area, allowing the upper level ridge to build into the region. Similarly at the surface, high pressure will slowly build into the region and strengthen off the southeast U.S. coast. As the low races off to the NE Tuesday night and the high strengthens off the Carolina coast, surface winds will become southerly. With the surface high and upper level ridge over the region skies will be mostly sunny/clear mid week with moderating temperatures. Weather will remain dry, likely through Thursday, with a slight chance for afternoon showers and thunderstorms returning late in the week. Models still differ on whether there will be precip or not Thursday night through Friday. As a result, will keep chances limited to slight. Highs in the low to mid 80s Tuesday will moderate into the mid to upper 80s by Wednesday, where they will remain through the end of the week. Similarly for overnight lows, upper 50s to low 60s Tuesday night, increasing to mid 60s for Wednesday night onward. For the weekend: A fair amount of uncertainty exists for this time period, thus confidence is not high. Will keep the overnight periods dry with slight chance for showers and storms in the afternoons. Temps will remain fairly steady with highs in the mid to upper 80s and lows in the mid 60s. && .AVIATION /12Z Sunday through Thursday/... As of 650 AM Sunday... 24 hour TAF period: low clouds and IFR cigs across the northern Piedmont and Coastal Plain regions are expected to lift to mvfr levels by mid to late morning. Flt conditions may locally lower to IFR again associated with a band of widely scattered showers that are expected to develop across our northern Piedmont and Triad zones (invof INT and GSO) during the late morning hours. These showers will then move SE across the eastern Piedmont and Coastal Plain regions around mid-day into the early afternoon...thus bringing a brief period of low-MVFR or IFR conditions to RDU, RWI, and FAY between 16z and 20z. Between 22/22z and 23/04z, another round of widely scattered showers (and assoc MVFR conditions) are expected to move across central NC assoc with the next in series of short waves. Beyond 23/04z, the best chance for low clouds and IFR conditions will be from RDU eastward. Beyond sunday night: The risk for sub-VFR conditions with scattered showers will continue through Monday as a closed low gradually moves across the region. VFR conditions expected to return by Tuesday and remain for the mid-week period as the closed low moves east and short wave ridging moves over our region. && .RAH WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...RAH NEAR TERM...WSS SHORT TERM...RAH LONG TERM...RAH AVIATION...RAH

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