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Area Forecast Discussion
Issued by NWS Wilmington, NC
Issued by NWS Wilmington, NC
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658 FXUS62 KILM 020101 AFDILM Area Forecast Discussion National Weather Service Wilmington NC 901 PM EDT Mon Jul 1 2024 .SYNOPSIS... Cooler weather behind the front is expected to persist through Wednesday. Heat and humidity will return late in the week with good potential for heat indices to exceed 105 degrees beginning Friday. && .UPDATE... Put out a Small Craft Advisory for the SE NC coastal waters due to the NE swell behind the front. Conditions should clear up by Mon morning. Updated aviation discussion below. && .NEAR TERM /THROUGH TUESDAY/... A cold front will push off the coast over the next couple of hours and end the lingering heavy rain threat. Post frontal dew points in the mid 60s has been a welcomed air mass change and this will remain over the area for the next couple of days. Mid level cloud cover near the coast could interfere with overnight lows, but dry air aloft will attempt to scour this cloud deck. Light northeast winds overnight will keep the shallow boundary layer mixed. As a result, have gone with low 60s inland and upper 60s to near 70s along the coast in onshore flow. Exceptionally dry air aloft and diurnal mixing on Tuesday could bring surface dew points into the lower 50s. Some dew point recovery is expected during the afternoon with onshore winds. A much cooler air mass will keep afternoon highs in the mid and upper 80s. && .SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/... Highlights: *Cooler than normal temperatures with mainly dry conditions Confidence: *Moderate to High Details: An unseasonably cooler and drier air mass is expected to prevail with surface high pressure to the north shifting off to the northeast by the end of the period. Models differ in how low dewpoints will get but we leaned toward the drier scenario given the deep subsidence and models typical poor handling of dewpoints. Limited moisture/forcing will keep rain unlikely for most, although could see some coastal showers at times, especially in SC where moisture convergence will be greatest. Temps should stay below normal through the period with highs mostly in the mid to upper 80s Wednesday and lows mainly in the mid to upper 60s away from the warmer coastal locales. && .LONG TERM /THURSDAY THROUGH MONDAY/... Highlights: *Excessive heat/humidity returns starting Friday Confidence: *Moderate to High Details: Deep high pressure should prevail which will keep temps above normal for the most part except for near the coast Thursday. The main concern will be the high heat indices of 105+ degrees which means there is a good chance for Heat Advisories and even Excessive Heat Warnings. Unfortunately, rain chances should stay pretty low, especially through Friday. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... An overnight breeze should persist behind a cold front, wind speeds 7-10 kts. Obs are showing occasional gusts near 20 kts but these should diminish headed into the overnight hours. Kept MVFR CIGs through 03Z but these should clear out as dry air continues to funnel in. VFR expected through the rest of the TAF period. Extended Outlook... VFR should dominate through the end of the week. && .MARINE... Through Tuesday... High pressure building over the northeastern US will keep breezy winds behind an exiting cold front. Near SCA gusts tonight due to a NE surge behind the cold front. Wind wave will build to 4-5 feet overnight. Winds will gradually shift this evening and into Tuesday as the high weakens and pushes offshore of Long Island. Onshore flow will keep seas choppy at around 3-4 feet as the remaining southerly swell diminishes. Tuesday night through Saturday...High pressure building from the north will shift offshore Wednesday allowing for the return of a more typical summertime pattern. Slightly elevated onshore winds Tuesday night will diminish Wednesday with seas likely peaking Tuesday night before becoming more swell-dominated. Overall, Small Craft Advisory conditions are not anticipated. && .ILM WATCHES/WARNINGS/ADVISORIES... NC...Beach Hazards Statement from 6 AM EDT Tuesday through Tuesday evening for NCZ106-108. SC...Beach Hazards Statement from 6 AM EDT Tuesday through Tuesday evening for SCZ054-056. MARINE...Small Craft Advisory until 6 AM EDT Tuesday for AMZ250-252. && $$ SYNOPSIS...ILM UPDATE...LEW NEAR TERM...21 SHORT TERM...RJB LONG TERM...RJB AVIATION...LEW MARINE...RJB/21