Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC
Issued by NWS Raleigh/Durham, NC
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041 FXUS62 KRAH 291406 AFDRAH Area Forecast Discussion National Weather Service Raleigh NC 1006 AM EDT Wed May 29 2024 .SYNOPSIS... A moisture-starved, reinforcing cold front will move through the area this evening, followed by high pressure from central Canada and the Great Lakes to the Middle Atlantic and Carolinas this week. && .NEAR TERM /TODAY AND TONIGHT/... As of 1006 AM Wednesday... Mid morning water vapor imagery depicts upper level low pressure over eastern Canada, with a trailing shortwave over Ohio. Farther east, a weak surface ridge remains in place over Virginia with only a few clouds across the Sandhills and Coastal Plain of North Carolina. Temps this morning are generally in the mid 70s, with noticeably lower dewpoints ranging from the mid 50s to lower 60s. The Ohio shortwave and attendant weak surface cold front will cross the mountains and slide into northern NC late this afternoon. While widespread showers/thunderstorms are not anticipated, there will likely be enough mid level moisture in place to support a few widely scattered showers along the NC/VA border late this afternoon. Instability is meager with only 100-250 J/KG of MLCAPE to work with but there are a few CAMs that suggest the development of a few showers just before sunset. Anything that forms will be short lived and should dissipate just after sunset. Temps today will range from the lower 80s in the NW to the upper 80s in the southeast. Lows tonight generally in the mid to upper 50s. && .SHORT TERM /THURSDAY AND THURSDAY NIGHT/... As of 300 AM Wednesday... With the Eastern US trough still overhead, an amplifying shortwave trough will dive south through the Mid-Atlantic states during the day, and then into NC through the overnight hours. PWATS will continue to hover around the 10th percentile, with little to no instability to work with. However, isolated showers/non-zero pops are possible Thursday evening and into Thursday night, mainly across eastern/coastal plain counties. Otherwise, cooler as Canadian high pressure builds south into the area. Highs ranging from mid/upper 70s north to lower 80s south. Lows in the lower to middle 50s north to upper 50s south. && .LONG TERM /FRIDAY THROUGH TUESDAY/... As of 200 AM Wednesday... The upper level trough will shift east and offshore on Fri, with the sub-tropical ridge progressing eastward toward the region Fri night, then continuing slowly eastward through the area Sat/Sat night. Meanwhile to the west, a s/w trough will move eastward through the MS Valley Sat/Sat night, then continue eastward across the Appalachians and through the mid-Atlantic Sun/Sun night. Another s/w will follow behind it, however the model guidance still varies wrt timing and track. At the surface, cool high pressure over the OH Valley Fri, will build slowly esewd into the mid-Atlantic Fri night, then through the Carolinas Sat/Sat night. The high will move ese to off the Southeast US coast on Sun, where it should sit through Tue. A warm front should lift through the area Sun night/Mon, with southerly return flow will once again advect warm, moist air into the area through early next week. For now, expect largely dry weather through Sun, with chances for precipitation returning for Sun night through Tue. Temperatures should be near to below normal through Sun, then moderating through early/mid next week. && .AVIATION /10Z TUESDAY THROUGH SUNDAY/... As of 620 AM Wednesday... 24 hour TAF period: Isolated showers are possible across the north/northeastern NC between 21-03z. Otherwise, VFR conditions are expected through the next 24 hours. Outlook: Canadian high pressure will build from cntl Canada to the middle Atlantic and favor VFR conditions in cntl NC through Sat. As the high shifts offshore, sly flow and increasing moisture will increase the risk of patchy fog and stratus Sun morning and a chance of showers/storms Sun afternoon-night. && .RAH WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...MWS NEAR TERM...Leins SHORT TERM...CBL LONG TERM...KC AVIATION...CBL/MWS