Area Forecast Discussion
Issued by NWS Newport/Morehead, NC
Issued by NWS Newport/Morehead, NC
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493 FXUS62 KMHX 141107 AFDMHX Area Forecast Discussion National Weather Service Newport/Morehead City NC 707 AM EDT Wed Aug 14 2024 .SYNOPSIS... High pressure building in from the north will remain over the Eastern Seaboard through late week before a front begins to approach from the west this weekend bringing increasing precipitation chances across the area. Swells from distant Tropical Storm Ernesto will begin impacting the coast starting Friday and persisting into the weekend, bringing a threat for elevated rip current risk and coastal impacts. && .NEAR TERM /TODAY/... As of 7 AM Wednesday...Not much change in the forecast for today as everything is tracking well this morning. Patchy fog is currently noted in the far western Coastal Plain but should dissipate within the next hour or two. Another pleasant day is forecast as surface high pressure continues to nudge southwards over the Carolinas keeping light N-NE`rly flow, lower humidity, and temps in the mid to upper 80s across most of ENC today. The lone exception being across the N`rn OBX where NE`rly flow should keep this area in the upper 70s. Otherwise, upper level trough will remain over the Eastern Seaboard today with a shortwave currently noted in the mid level water vapor imagery in Canada rounding the base of the upper trough this afternoon and evening before pushing off the coast tonight. Much like Tuesday, as this trough moves through the area, iso to scattered showers and storms are forecast to develop mainly to the north and west of the CWA but then dive S`wards across portions of ENC, mainly along and west of Hwy 17. Most Hi-Res CAM guidance supports this solution and with HREF Neighborhood probs of greater than 0.01 inches of rain sitting at 10-30% across the same area, kept SChc PoP`s in the forecast across our inland counties this afternoon. Will note anywhere it does rain amounts will be light, generally less than 0.05 inches given the relatively dry airmass. && .SHORT TERM /TONIGHT/... As of 330 AM Wednesday...Aforementioned shortwave will be pushing off the coast tonight and any leftover shower and thunderstorm activity should quickly end from north to south prior to midnight. This will once again allow for skies to clear across the area. This combined with calm winds and a moist boundary layer will bring yet another threat for patchy fog development, mainly along and west of Hwy 17 with timing for fog development likely after midnight. The only other thing to note with tonight`s forecast is given the expectation for mo clear skies and calm winds, a good radiational cooling setup is forecast tonight. With this in mind, have lowered temps slightly tonight below most guidance to account for this with lows in the low to mid 60s inland and mid to upper 60s along the OBX and immediate coast. && .LONG TERM /THURSDAY THROUGH TUESDAY/... As of 330 AM Wednesday...A drying trend will commence mid-week as a cold front offshore slowly sags southward and high pressure builds into the area from the northwest. The upper trough shifts off the East Coast Thursday and Friday with upper ridging building in from the west. NHC guidance continues to take Tropical Cyclone Ernesto well off the NC coast, close to Bermuda, Friday night through the weekend. At the same time, another trough will dig south from the Great Lakes into the eastern CONUS, with a weak frontal feature moving into Eastern NC by late weekend, bringing with it increasing chances for showers & thunderstorms across the region. Trended PoPs closer to climo, diurnally-driven convective activity by midday through the evening with waning activity overnight. 00Z 14th guidance is in better agreement with a surface boundary shifting more offshore by Monday, so may need to trim back PoPs a bit, esp. for inland locations. Seasonable temps continue with highs generally in the mid 80s through Tuesday. While we are not expecting direct impacts from Ernesto at this time, large swells are expected to impact the beaches bringing an increased rip current risk and large surf beginning Friday and continuing through the weekend. See Coastal Flooding section below for more details. && .AVIATION /12Z WEDNESDAY THROUGH SUNDAY/... SHORT TERM /Through Wednesday night/... As of 7 AM Wed...While fog was not as widespread as previously thought this morning, some patchy fog has been found along the far western Coastal Plain mainly across PGV and points north and west, but this fog should dissipate within the next hour or two resulting in VFR ceilings and vis across all of ENC by mid- morning. A diurnal Cu field at 3.5-5 kft will set up around mid-morning and persist into the evening hours before gradually dissipating. Another round of iso showers/tstms will be possible after 18Z once again, mainly along and west of Hwy 17 as yet another shortwave moves across the area but given limited coverage of activity, no mention of precip in the TAFs just yet. Continued light winds expected through the entire period generally around 5 kts coming from the NE on Wed. By Wed evening any leftover shower and tstm activity should gradually dissipate by about midnight at the latest with clearing skies and light winds expected once again across ENC. Yet another potential round of patchy fog will be possible tonight mainly after 06Z. Will preclude a mention of fog in the TAFs for now given inherent uncertainty with fog coverage especially considering the last two nights. LONG TERM /Thursday through Sunday/... As of 330 AM Wednesday...Dry weather expected Thursday and Friday, then unsettled weather returns for the weekend. Light winds and good radiational cooling conditions will continue to bring the chance for late night/early morning fog and stratus most mornings, especially given the saturated ground. Weak cool front will move into the area by this weekend, yielding increasing chances for unsettled weather with showers/storms possible, mainly during peak heating which may produce sub-VFR conditions at times on Saturday and Sunday. && .MARINE... SHORT TERM /through Wednesday night/... As of 330 AM Wed...Benign boating conditions continue across our waters with high pressure remaining in control of the pattern. Widespread 5-15 kt N-NE winds are forecast across all waters and 2-4 ft seas are forecast across all coastal waters through the period. LONG TERM /Thursday through Sunday/... As of 335 AM Wednesday...Good boating conditions through much early Friday morning with high pressure building into the area bringing NE winds around 5-15 kt. Winds begin to veer to E and SE late Friday into Saturday as the high moves offshore, and Tropical Cyclone Ernesto passes close to Bermuda. Seas will generally be around 2 to 3 ft through early Friday. By sunrise Friday, we will begin to see long period (14-15 second) swells from Ernesto move into the waters which will build through Saturday. Wave guidance suggests long period swells could impact the waters through Sunday into early Monday. Long period swells could make inlet conditions particularly dangerous at times of opposing winds/currents/tides and perpendicular swell energy (SE/E/NE direction), especially for southeast and east facing inlets along the NC coast. && .HYDROLOGY... As of 330 AM Wed...Minimal changes to the river flood threat as we are still waiting for a few rivers to crest later this week and weekend. Given this, river flooding will continue across many river basins in Eastern NC, including the Trent, Neuse, and Tar Rivers as well as several tributaries. River flooding will persist through the weekend and into next week as the abundant rainfall that occurred across the NC Piedmont, upstream of the forecast area, makes its way towards the sounds and coast. It should be noted that some of the worst river flooding is still yet to come, with some rivers not cresting until late week or this weekend. && .TIDES/COASTAL FLOODING... As of 330 AM Wed...Little change in the forecast over the next few days as TC Ernesto is forecast to strengthen into a hurricane later today then pass well to the east late week into this weekend. Strong long period swells from distant Ernesto will combine with high astronomical tides, which will likely lead to several coastal hazards. Dangerous rip currents and rough surf are expected for the beaches. There is also potential for beach erosion and ocean overwash (esp. where dune structures are vulnerable). The greatest window of concern will be Friday morning into early next week. More specifics will be provided over the next few days. && .MHX WATCHES/WARNINGS/ADVISORIES... NC...None. MARINE...None. && $$ SYNOPSIS...MHX NEAR TERM...RCF SHORT TERM...RCF LONG TERM...DAG AVIATION...DAG/RCF MARINE...DAG/RCF HYDROLOGY...MHX TIDES/COASTAL FLOODING...MHX