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Area Forecast Discussion
Issued by NWS Burlington, VT
Issued by NWS Burlington, VT
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450 FXUS61 KBTV 111101 AFDBTV Area Forecast Discussion National Weather Service Burlington VT 701 AM EDT Thu Jul 11 2024 .SYNOPSIS... Heavy rain that has caused flash flooding is lifting north and east out of the forecast area this morning. Rivers are on the rise and cresting this morning, some within flood stages. Precipitation will become isolated to scattered today, gradually drying out into the weekend. Temperatures will remain warm and humid, increasing over the weekend. && .NEAR TERM /THROUGH FRIDAY/... As of 638 AM EDT Thursday...Main focus in operations this morning has been to make a gradual shift from Flash Flood Warnings to Areal Flood Warnings, monitoring numerous river gages that are in or approaching flood stages, and gathering rainfall amounts to eventually put together a storm total rainfall map for this event. Rain showers are lighter and more scattered this morning than they were yesterday, but they`re returning nonetheless, and some areas are experiencing foggy or misty conditions this morning. Forecast is overall on track. Previous discussion...As heavy rain shifts north and east of the forecast area this morning, we continue to watch river rises and cresting throughout the day today. If you live near the Winooski, Mad, Missisquoi, Passumpsic, Ausable, Lamoille, Great Chazy, and Wells rivers, be aware of how you might be affected by moderate to major river flooding at water.noaa.gov, which has an impact list for where the most impacts occur at various river levels. More on the specifics of this hydrological threat in the hydro section. We`re anticipating some pop-up showers throughout the day today as the center of Beryl`s rotation finally crosses the forecast area. Chances of precipitation will be 10-50%, with highest chances stretched from the Adirondacks to the Northeast Kingdom, which is unfortunately the primary area that received heavy rain over the last 24 hours. While these showers are not expected to be nearly as heavy as the recent activity, soils are well saturated and will have difficulty taking on more rain, and this may make for poor cleanup conditions. We`re expecting up to a quarter of an inch of additional rainfall in spots today, likely less than that for most. High temperatures will be around seasonal averages in the mid-70s to upper 80s, with warmest temperatures concentrated in the southern Connecticut River and Champlain valleys. Tonight will be a drier, mild night with lows in the 60s for most places. Patchy fog is possible in the typical valley locations where rain has occurred and light/variable winds are forecast. Tomorrow will be a fairly pleasant day for cleanup efforts with highs in the upper 70s to mid-80s and mostly dry weather. There could be a few light, isolated showers across terrain, but generally chances are low and no measurable precipitation is anticipated. && .SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY/... As of 322 AM EDT Thursday...Friday will be a good day for recovery from any flooding experienced Wednesday and Thursday. Skies will gradually clear throughout the day as the remnants of Beryl get a little more distant from our CWA. We could see some light scattered showers in Saint Lawrence county as well as far northern Vermont, but measurable precipitation will be isolated. Heat values will remain above normal for most of the area primarily being driven by consistently high surface moisture. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... As of 322 AM EDT Thursday...High pressure to our east will keep us dry through the weekend. A warming trend will continue through Sunday, with temperatures reaching into the low 90s in the Champlain and Connecticut river valleys. Early next week we are looking at a low pressure system transversing along the international border, bringing a threat of thunderstorms. We will continue to refine the timing and impacts as the models converge. && .AVIATION /12Z THURSDAY THROUGH MONDAY/... Through 12Z Friday...Thick, soupy, tropical moisture is crossing our forecast area today associated with the remnants of Beryl. All sites have MVFR or lower conditions as of this morning whether in the form of low visibilities in mist/fog (roughly 1 mile) or low ceilings with cigs 300-2100 feet above ground level. As the remnants of Beryl swirl across the St. Lawrence Valley, sites closest to this portion of the forecast area will experience MVFR or lower conditions for the next 24 hours. Those farthest from Beryl (RUT, MPV) will likely break out into VFR conditions for several hours this afternoon. However, cigs and vis will trend downward again 00Z Friday onward as high pressure and subsidence increases chances of fog over very saturated soils once again. Winds will be light and variable or terrain based for much of the TAF period. Outlook... Friday: Mainly VFR, with local MVFR possible. Slight chance SHRA. Friday Night: VFR. Slight chance SHRA. Saturday: VFR. Slight chance SHRA. Saturday Night: VFR. NO SIG WX. Sunday: VFR. NO SIG WX. Sunday Night: VFR. Chance SHRA, Slight chance TSRA. Monday: Mainly VFR, with local MVFR possible. Chance SHRA, Chance TSRA. && .HYDROLOGY... As of 644 AM EDT Thursday...Showers this morning are much lighter than we`ve seen so far with this system, and are anticipated to bring an additional 0.10-0.30" of rain through this evening. The most significant flooding is occurring near Barre, Williamstown, Groton, Barnet, Lyndonville, and Marshfield where 4 to 5, locally over 6 inches has fallen. Expect numerous road washouts, debris flows, evacuations in central Vermont, and water in homes and businesses. Convection placed itself near the headwaters of several mainstem rivers. Several rivers may crest near major flood stage. Visit water.noaa.gov for details on impacts for area rivers and additional details with changes to the forecast. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...Flood Watch until noon EDT today for VTZ001>010-016>018. NY...Flood Watch until noon EDT today for NYZ028-031-034-035. && $$ SYNOPSIS...Storm NEAR TERM...Storm SHORT TERM...Langbauer LONG TERM...Langbauer AVIATION...Storm HYDROLOGY...Team BTV