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Area Forecast Discussion
Issued by NWS Sterling, VA
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Issued by NWS Sterling, VA
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-- Discussion containing changed information from previous version are highlighted. --000 FXUS61 KLWX 191404 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1004 AM EDT Thu May 19 2022 .SYNOPSIS... After a warm front lifts north of the region this morning, a weak cold front will nose into the region this afternoon. The front will then return northward as a warm front Friday. A stronger cold front is expected to approach from the Midwest over the weekend, likely crossing the region late Sunday into Monday. The front may stall nearby early next week. && .NEAR TERM /THROUGH FRIDAY/...-- Changed Discussion --Temperatures have been slow to moderate this morning due to the eroding clouds lingering on a little longer than most guidance had, but otherwise forecast remains on track. Keeping an eye on the late tonight into Friday morning timeframe for where the remnants of an MCV tracks. Otherwise, previous discussion follows. Today will be warmer than Wednesday with highs into the 80s for most, some clouds, and westerly breezes. The cold front that drops through today will return northward as a warm front tonight. There are hints of a wave aloft forming as a result of thunderstorms over the Plains. This wave may crest over the warm front Friday, and could bring some showers and thunderstorms. There is a conditional risk of strong to severe storms given much stronger CAPE (2000+ J/kg) and modest mid- level flow (i.e. 25-35 kt 850-500 hPa). After a mild and muggy start Friday morning, temperatures may crack 90 over much of the area Friday afternoon. Heat index values in the mid to upper 90s are possible.-- End Changed Discussion --&& .SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/... Ridging will build over the area aloft through Saturday as Bermuda high pressure sets up offshore. This will likely result in record heat, with heat index values of 95 to 100. It will be very unstable, but with less shear and not much of a trigger, thunderstorm risks may be limited to terrain circulations near and west of the Blue Ridge Mountains during the afternoon and early evening. A wave of low pressure may develop over the Midwest, which could subtly enhance convective activity near the Alleghenies late Saturday. && .LONG TERM /SUNDAY THROUGH WEDNESDAY/... On Sunday morning, low pressure will likely be near or east of Michigan, with a cold front trailing to the southwest. This slower trend to the front means one more hot day is becoming increasingly likely for Sunday. Thicknesses will be a little lower, and clouds may begin to increase, so lower to perhaps mid 90s is the most likely outcome. Showers and thunderstorms will be developing along the front and/or a prefrontal trough as they progress eastward during the afternoon. With a lack of upper level support and marginal shear, thunderstorm coverage and intensity is in question, but it still looks like a potentially active period during the afternoon and evening. The front may not push fully through the area until early Monday, but there is good model agreement that it will push far enough south to result in a much cooler day. However, confidence lowers on precipitation chances for Monday and Tuesday as the front likely lurks to the south and high pressure to the north builds southward along the Appalachains. Should more pronounced waves of low pressure develop along the front, it would result in greater rain chances. Overall, it`s looking like a cooler and more unsettled period. By Wednesday, the front may try to return northward as low pressure moves into the Great Lakes. This will keep a chance of showers in the forecast, albeit with slightly warmer temperatures. && .AVIATION /14Z THURSDAY THROUGH MONDAY/...-- Changed Discussion --VFR conditions are expected through Saturday outside of any TSRA, the chance of which remains low/conditional overall. Light and variable winds early this morning will shift to westerly by mid to late morning. Winds may gust 20-25 knots this afternoon as a weak cold front crosses. S/SW flow returns Friday into Saturday with a few gusts of 15-20 knots possible at times. Cold front approaches Sunday afternoon and exits early Monday. Showers and thunderstorms will be possible with passage. The front will likely stall to the south Monday, which could result in some showers and intermittent sub-VFR ceilings.-- End Changed Discussion --&& .MARINE... S flow will pivot to W by mid morning, abating over the mid bay and lower tidal Potomac by late morning. Near shore W gusts are likely this afternoon. Thereafter, light winds are expected overall through Saturday, though near shore gustiness is possible during the afternoon, with southerly channeling kicking up winds over the open waters possible at night. A few thunderstorms are possible at times through Saturday, but chances remain low. Small Craft Advisories may be needed for portions of Sunday into early Monday as a cold front crosses and shifts winds from southwest to northwest. Gusty thunderstorms are also possible. Lighter winds are expected by Monday. && .TIDES/COASTAL FLOODING... Stronger southerly winds have pushed water up the bay overnight, and it appears Annapolis will reach minor flood thresholds this morning. It will be close at Baltimore, Havre de Grace and DC SW Waterfront, so will monitor for potential advisories there as the morning progresses. As a front slips to the south today, winds will shift and anomalies should decrease. && .CLIMATE...-- Changed Discussion --Hot weather is forecast Friday through Sunday with temperatures likely 10 to 20 degrees above normal. Below is a list of temperature records Friday through Sunday (May 20th-22nd). -------------------------------------------------------------- Record Daily High Temperatures for May 20th -------------------------------------------------------------- Washington DC area........96 F (set in 1996).................. Baltimore MD area.........95 F (set in 1962).................. Sterling/Dulles VA area...93 F (set in 1996).................. Martinsburg WV area.......97 F (set in 1911).................. -------------------------------------------------------------- -------------------------------------------------------------- Record Daily Warm Low Temperatures for May 21st -------------------------------------------------------------- Washington DC area........71 F (set in 1996).................. Baltimore MD area.........71 F (set in 1934).................. Sterling/Dulles VA area...67 F (set in 2013 and 1996)......... Martinsburg WV area.......65 F (set in 1996 and 1911)......... -------------------------------------------------------------- -------------------------------------------------------------- Record Daily High Temperatures for May 21st -------------------------------------------------------------- Washington DC area........95 F (set in 1934).................. Baltimore MD area.........96 F (set in 1934).................. Sterling/Dulles VA area...92 F (set in 1996).................. Martinsburg WV area......100 F (set in 1934).................. -------------------------------------------------------------- -------------------------------------------------------------- Record Daily Warm Low Temperatures for May 22nd -------------------------------------------------------------- Washington DC area........71 F (set in 1959).................. Baltimore MD area.........71 F (set in 1903).................. Sterling/Dulles VA area...67 F (set in 1975).................. Martinsburg WV area.......68 F (set in 1959).................. -------------------------------------------------------------- -------------------------------------------------------------- Record Daily High Temperatures for May 22nd -------------------------------------------------------------- Washington DC area........96 F (set in 1941).................. Baltimore MD area.........98 F (set in 1941).................. Sterling/Dulles VA area...89 F (set in 2021).................. Martinsburg WV area.......98 F (set in 1934).................. -------------------------------------------------------------- Temperature records for the Washington DC area have been recorded at what is now Ronald Reagan Washington National Airport (KDCA) since 1941. The official weather record consists of that data back to 1945, and observations taken in downtown Washington from 1872 through 1944. Temperature records for the Baltimore MD area have been recorded at what is now Baltimore-Washington International Thurgood Marshall Airport (KBWI) since 1950. The official weather record consists of that data, and observations taken in downtown Baltimore from 1872 through 1949. Temperature records for the Sterling/Dulles VA area have been recorded at what is now Washington Dulles International Airport (KIAD) since 1960. The official weather record consists solely of that data. Temperature records for the Martinsburg WV area have been recorded at what is now Eastern West Virginia Regional Airport (KMRB) since 1938. The official weather record consists of that data back to 1944, and observations taken in downtown Martinsburg from 1891 through 1943. All climate data is considered preliminary until reviewed and certified by the National Centers for Environmental Information (NCEI).-- End Changed Discussion --&& .LWX WATCHES/WARNINGS/ADVISORIES...-- Changed Discussion --DC...None. MD...Coastal Flood Advisory until 11 AM EDT this morning for MDZ014. VA...None. WV...None. MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ530>532-535-538. Small Craft Advisory until noon EDT today for ANZ533-534-536- 537-541>543.-- End Changed Discussion --&& $$ SYNOPSIS...DHOF NEAR TERM...DHOF/CPB SHORT TERM...DHOF/CPB LONG TERM...ADS AVIATION...ADS/DHOF/CPB MARINE...ADS/DHOF/CPB TIDES/COASTAL FLOODING...ADS CLIMATE... LWX
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