|Dew Point:||63.0°F (17.2°C)|
|Sea Level Pressure:||26.47" (896.3 mb)|
Partly CloudyLow: 71
Mostly SunnyHigh: 82 Low: 68
Chance Showers And ThunderstormsHigh: 73 Low: 59
Mostly SunnyHigh: 72 Low: 58
Mostly SunnyHigh: 71 Low: 57
Partly cloudy, with a low around 71. West southwest wind around 13 mph.
Mostly sunny, with a high near 82. West southwest wind 10 to 16 mph, with gusts as high as 21 mph.
A slight chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 68. West southwest wind 13 to 17 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 73. West northwest wind 7 to 16 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
A chance of rain showers before 8pm. Mostly cloudy, with a low around 59. North wind 6 to 9 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Mostly sunny, with a high near 72.
Partly cloudy, with a low around 58.
Mostly sunny, with a high near 71.
Partly cloudy, with a low around 57.
... High pressure will remain offshore tonight and a strong cold front will approach our area Tuesday before passing through Tuesday night into Wednesday. Showers and thunderstorms are possible ahead of this cold front. The front could stall to our southeast, while a second area of high pressure builds in from the west later this week.
NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... Most of the convection from this afternoon and early evening has dissipated. However...very humid conditions persist and a weak surface trough remains near the Blue Ridge Mountains. Therefore...a popup shower or thunderstorm cannot be ruled out through late this evening.
High pressure will remain offshore overnight. A southerly flow will continue to usher in warm and quite humid conditions. Min temperatures will range from the 60s in the Potomac Highlands to the mid and upper 70s in downtown Washington and Baltimore. Most places should turn out dry overnight as the nocturnal inversion strengthens. Patchy low clouds and fog are possible...especially in sheltered valleys and areas that have received rainfall from thunderstorms earlier.
SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/... A very warm day on tap Tuesday with highs in the lower to mid 90s. Will have to keep an eye on dewpoints Tuesday...because a Heat Advisory may be needed for portions of the area...particularly along and east of the Interstate 95 corridor. As of now...it appears that the low-level flow may go slightly west of south and this will cause winds to be better aligned with height...increasing mixing. Therefore...dewpoints may drop into the upper 60s and lower 70s. If this occurs...then heat indices will be closer to 100 degrees. However...if not then dewpoints would hold in the middle 70s causing heat indices closer to 105 degrees. Will mention the possibility of heat in the Hazardous Weather Outlook for now.
A cold front will move into the Ohio Valley by Tuesday evening...bringing a chance of thunderstorms to the western part of the forecast area late in the afternoon/evening. Given the amount of CAPE that will be available severe weather is a possibility, especially west of the Blue Ridge. SREF has been consistent on weakening the storms after 00Z Wednesday as these attempt to track east of the mountains - we'll have to see.
The front is expected to move through the forecast area Tuesday night into Wednesday morning. This will bring a drop of about ten degrees to the region Wednesday, and the start of some very pleasant weather that will go into the weekend.
LONG TERM /THURSDAY THROUGH MONDAY/... High pressure passing from the Great Lakes into New England will control the weather pattern over the Mid-Atlantic late this week through the weekend. Temperatures and humidity will be below normal, more reminiscent of late September than late August. Precipitation chances will be minimal during this time.