Area Forecast Discussion
Issued by NWS Wakefield, VA

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388 FXUS61 KAKQ 231404 AFDAKQ Area Forecast Discussion National Weather Service Wakefield VA 1004 AM EDT SAT JUL 23 2016 .SYNOPSIS... High pressure prevails over the region through Monday. A weak front drops south across the northern Delmarva tonight, then lifts back to the north Sunday. A weak cold front drops into the region Tuesday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... The current surface analysis depicts high pressure centered from the mid-South to the wrn Atlantic with a lee-side trough east of the mountains. Aloft, a ridge is centered over the Mississippi Valley region with a trough over Atlantic Canada. The airmass appears too capped today for convection despite the presence of a lee-side trough. Thus, a dry forecast has been maintained through 21z before a slight chc PoP reaches the lower MD Ern Shore. 850mb temperatures remain in the 20-22C range (+2 st dev). This should support highs solidly in the mid 90s to locally upper 90s inland today, with highs reaching the low 90s at the coast. Some mixing is expected this afternoon resulting in dewpoints averaging in the 70-73 range during peak heating hours. This results in heat indices between 100-104 (although some of the AWOS sites will report a bit higher than that). Highest heat indices will be across SE VA and NE NC. Premise here is that guidance has been around 2 degrees to warm past few days. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/... High res data in decent agreement that a shortwave trof results in sct convection developing this evening. Data has this activity mainly across the northern neck / lwr Md eastern shore before weakening as it drifts SE after midnite. Will carry 30-40 pops there with a 1-2 county buffer zone of slght chc pops mainly NE of I64. Otherwise...a warm and muggy night with lows in the mid-upr 70s. Frontal boundary weakens as it lifts north of the fa Sun. High prs dominates along with the thermal trof across srn VA / nrn NC. Kept slght chc pops btwn 18Z-00Z ivof this feature. 850 mb temps support highs in the mid-upr 90s. Dp temps progged about 1-2 degrees higher than today which results in heat index values aoa 105 (heat advsry levels) for most of the southern half of the fa. Fair and muggy Sun nite with any convection quickly dissipating after sunset. Lows in the mid to upper 70s. Monday appears to be the hottest day of this stretch with only a low chc pop across the nwrn zones late for any convection that develops across the mts and drifts east. Highs 95-100 combined with dp temps btwn 70-75 yields heat index values btwn 104-108 (heat advsry levels). Will continue to address the heat in the HWO. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... A cold front crosses the region on Tuesday and then stalls over the area during the rest of the week...fluctuating/wobbling its position over time in persistent zonal flow aloft. Temperatures still expected to peak in the low-mid 90s for highs with dewpoints in the low-mid 70s. This will generally maintain heat index values of 100-104 degrees each afternoon. Lows generally in the mid 70s each night. Precip chances finally increase to a decent 30-40% POP each afternoon...beginning with the frontal passage on Tuesday afternoon/evening. Thunderstorms should be expected each day. Main impacts will be strong wind gusts and locally heavy rainfall due to pwats upwards of 2.00 inches. && .AVIATION /14Z SATURDAY THROUGH WEDNESDAY/... 12Z taf period starts off with vfr conditions and light winds over all terminals. Expect winds to avg out of the sw tda at 6-10 kt with mainly just some passing hi clouds. Shras/Tstms will be possible tngt, especially at ksby, as a weak frnt drops into the area, but the chance of rain in the latter half of the TAF period is not hi enough to warrant mention in the TAFs attm. A cold front drops towards the area Monday-Tuesday bringing isolated-scattered shras/tstms both days...primarily during the afternoon/evening hours. Brief reductions in VSBYS and CIGS to MVFR/IFR levels are possible with the storms. && .MARINE... All headlines have been cancelled as sca conditions have not materialized this morng. Expect a fairly stagnant wx pattern over the next few days with hi pressure centered off the se coast and weak trofs of lo pressure over the Mid Atlc. Winds will avg 10-15 kt out of the s/sw thru this period with 1-2 ft waves over the Bay and mainly 2-3 ft seas over Cstl Wtrs. The next cold front drops into the area late Tue/Tue night. Sub-sca conditions expected to continue thru at least mid week. && .CLIMATE... While its certainly going to be hot today thru Mon, climatologically this is the hottest time of the year with several heat waves having occurred in the past that have been far more intense than what we will experience. Record highs are unlikely to be set and in most cases, doubt they will even challenged within 5 degrees. * RECORD HIGHS: * Sat (7/23) Sun (7/24) Mon (7/25) * RIC: 103 (1952) 105 (2010) 105 (2010) * ORF: 103 (2011) 105 (2010) 105 (2010) * SBY: 103 (2011) 101 (2010) 100 (2010) * ECG: 104 (1952) 97 (2012) 99 (1949) && .AKQ WATCHES/WARNINGS/ADVISORIES... MD...None. NC...None. VA...None. MARINE...None. && $$ SYNOPSIS...MPR NEAR TERM...MPR/AJZ SHORT TERM...AJZ/MPR LONG TERM...BMD AVIATION...MAS MARINE...MAS CLIMATE...AKQ

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