335 FXUS61 KLWX 011801 AFDLWXArea Forecast Discussion National Weather Service Baltimore MD/Washington DC 201 PM EDT Wed Oct 1 2025
.SYNOPSIS... Broad high pressure over eastern Canada will wedge south into the region through Friday bringing lower humidity and cooler temperatures. The wedging high will gradually push off the New England coast leading to moderating temperatures this weekend. The next chance for rain arrives with a cold front early next week.
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.NEAR TERM /THROUGH TONIGHT/... High pressure over Quebec will gradually build southward over the next few days, eventually settling over New Jersey by Friday morning. This will support fair weather conditions and north to northeast winds around 10 mph or less. Low temperatures tonight will fall into the 40s west of I-95 with even some mid 30s and frost in the most sheltered high elevation valleys.
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.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/... The surface wind flow will turn more onshore Thursday into Friday leading to a scattered stratocumulus deck. Lows Friday morning will be similar to Thursday despite more clouds around.
The surface high will drop further down the Mid-Atlantic coast with light winds and daytime stratocumulus clouds Friday. It will continue to be cooler than normal, especially at night due to good radiational cooling conditions under high pressure.
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.LONG TERM /SATURDAY THROUGH WEDNESDAY/... Persistent upper-level ridging will remain over the East Coast Saturday through early next week as troughing approaches from the west. At the surface, high pressure stationed over the Northeast will yield reduced cloud cover and dry conditions Saturday through Monday. High temperatures will warm gradually with highs in the 70s to low 80s for most; those at higher elevations will stay in 60s each day. Overnight low temperatures will be in 40s and 50s Saturday night before warming to the 50s and 60s Sunday night.
As upper-level troughing approaches the area, a cold front will approach from the Great Lakes early next week. This will bring the next chance for precipitation Tuesday into Wednesday.
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.AVIATION /18Z WEDNESDAY THROUGH MONDAY/... N/NE winds AOB 10 kt are expected through through tonight with any residual gusts diminishing by 22Z. Flow will become more E Thursday, then SE Friday. A few stratocumulus clouds may develop Thursday morning and persist on and off through Friday with bases between FL025-FL060 (lowest 09z-16z).
Winds remain out of the south Saturday and Sunday, blowing 5 to 10 knots each afternoon. Winds are expected to become light and variable overnight. VFR conditions persist both days with no precipitation in the forecast.
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.MARINE... Winds will gradually diminish and turn from N/NE to E then SE through Friday. SCAs may be cancelled early if the gradient relaxes a bit quicker than anticipated. Otherwise, light winds and dry weather are forecast through the end of the week.
Southerly winds of 5 to 10 knots are expected across the waters Saturday and Sunday. No marine hazards are expected as high pressure builds over the waters.
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.TIDES/COASTAL FLOODING... The threat for widespread minor coastal flooding, and expected moderate coastal flooding at Annapolis, look to occur during multiple high tide cycles starting late tonight and continuing through Friday. Have issued a Coastal Flood Warning to account for this threat during the high tide cycle tonight for Anne Arundel County. Further extensions/advisories will likely be needed for the upcoming high tide cycles Thursday and Friday with snapback likely to occur. This is due to strong northeasterly winds piling up water in the lower Chesapeake Bay through tonight, quickly turning back to the east and southeast Thursday into Friday.
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.LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...Coastal Flood Warning from 8 PM this evening to 5 AM EDT Thursday for MDZ014. Coastal Flood Advisory from 5 AM to 5 PM EDT Thursday for MDZ014. Frost Advisory from 2 AM to 9 AM EDT Thursday for MDZ509-510. VA...Frost Advisory from 2 AM to 9 AM EDT Thursday for VAZ503-504. WV...Frost Advisory from 2 AM to 9 AM EDT Thursday for WVZ501-503- 505-506. MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ530- 535-536-538-539. Small Craft Advisory until midnight EDT tonight for ANZ531-532- 540-542. Small Craft Advisory until 6 PM EDT Thursday for ANZ533-534- 537-541-543.
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SYNOPSIS...DHOF/EST NEAR TERM...LFR/DHOF SHORT TERM...LFR/DHOF LONG TERM...AVS AVIATION...AVS/LFR/DHOF MARINE...AVS/LFR/DHOF TIDES/COASTAL FLOODING...LWX
NWS lwx Office Area Forecast Discussion