The SI Weather
25Aug/14Mon

7:00 AM | A fantastic start to the week in the Mid-Atlantic…Tropical Storm Cristobal to stay off the east coast

6-Day Forecast

Today

Mostly sunny, pleasant, highs in the low 80’s

Tonight

Mainly clear, cool, lows near 60 degrees

Tuesday

Mostly sunny skies, comfortably warm, moderate humidity, low-to-mid 80’s

Tuesday Night

Mostly clear, cool, low 60's

Wednesday

Mostly sunny, warmer and more humid, maybe a shower or thunderstorm at night, upper 80’s

Thursday

Partly sunny, warm, mid 80’s

Friday

Mainly sunny, pleasant, low 80’s

Saturday

Partly sunny, comfortable, low-to-mid 80’s

Discussion

High pressure now sitting over the Northeast US will be the main player on the weather scene during the next couple of days as it will remain rather stationary. As a result, there will be plenty of sunshine through tomorrow with relatively comfortable temperatures and humidity levels. By Wednesday, however, humidity and warmth will increase ahead of a cool frontal system as the high slides off the northeast coastline promoting a southwesterly flow of air. That front could spark a shower or thunderstorm Wednesday night before yet another refreshing air mass returns to the Mid-Atlantic region for the latter part of the week. Meanwhile, Tropical Storm Cristobal formed yesterday near the Bahama Islands and all indications are that it will stay east of the US coastline this week before it turns away to the northeast. Cristobal certainly can reach hurricane status over the next couple of days as it meanders off the east coast and it will continue to be closely monitored.

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22Aug/14Fri

7:00 AM | Unsettled weather continues into tomorrow; a cool weekend is coming as strong Canadian high pressure generates an ocean flow

6-Day Forecast

Today

Partly sunny, a tad cooler than yesterday, humid, chance for showers and thunderstorms, highs near 85 degrees

Tonight

Mainly cloudy, mild, chance for showers and thunderstorms, lows in the mid-to-upper 60’s

Saturday

Mostly cloudy skies, cooler, still the chance for showers and thunderstorms, near 80

Saturday Night

Mostly cloudy, cool, slight chance for a shower or thunderstorm, low 60’s

Sunday

Mostly sunny, quite cool, mid 70’s

Monday

Mostly sunny, still quite cool, mid-to-upper 70’s

Tuesday

Mainly sunny, pleasant, near 80

Wednesday

Mostly sunny, nice, low 80’s

Discussion

Unsettled weather will continue into tomorrow in the DC metro region with scattered showers and thunderstorms possible as additional upstream moisture rides along a frontal boundary zone. Cooler weather is in store for the weekend as strong Canadian high pressure will build southward into the area. Once this high takes control of the weather pattern, a persistent low-level flow of air will develop from the east-to-northeast. Temperatures will generally hold in the 70’s for highs this weekend and into the early part of next – well below normal for this time of year.

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21Aug/14Thu

7:00 AM | High chance for showers and thunderstorms next couple of days and some of the rain will be heavy; quite a cool weekend on its way

6-Day Forecast

Today

Partly sunny, quite warm, humid, chance for mid-to-late afternoon showers and thunderstorms, highs in the upper 80’s

Tonight

Mainly cloudy, mild, chance for showers and thunderstorms, lows in the upper 60’s

Friday

Partly sunny skies, a tad cooler, chance for showers and thunderstorms, low-to-mid 80’s

Friday Night

Mostly cloudy, mild, good chance for showers and thunderstorms, upper 60’s

Saturday

Mostly cloudy, quite cool, chance for a few showers and possibly a thunderstorm, upper 70’s

Sunday

Partly-to-mostly sunny, quite cool, mid-to-upper 70’s

Monday

Mainly sunny, still quite cool, mid-to-upper 70’s

Tuesday

Mainly sunny, pleasant, near 80

Discussion

An active weather pattern is in store for the Mid-Atlantic region over the next couple of days as waves of low pressure move along a stalled out frontal boundary zone. Scattered showers and thunderstorms are likely to affect the region through tomorrow night and possibly even on Saturday and some of the rain will fall heavily at times. Canadian high pressure will eventually build south into the region from southeastern Canada and this system will end up being the main weather feature by later this weekend and through the early part of next week and it will generate an unusually cool low-level east-to-northeast flow of air into the region. In fact, high temperatures this weekend up and down the I-95 corridor region from DC-to-New York City will generally be confined to the 70's which is well below normal for this time of year.

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20Aug/14Wed

7:00 AM | More unsettled pattern with an increasing threat for showers and thunderstorms

6-Day Forecast

Today

Partly sunny, warm, more humid, chance for showers and thunderstorms late, highs in the mid-to-upper 80’s

Tonight

Mainly cloudy, mild, chance for showers and thunderstorms, lows in the upper 60’s

Thursday

Mostly cloudy skies, warm, humid, chance for showers and thunderstorms, mid-to-upper 80’s

Thursday Night

Mostly cloudy, mild, chance for showers and thunderstorms, upper 60’s

Friday

Partly sunny, cooler, chance for showers and thunderstorms, low 80's

Saturday

Mostly cloudy, downright cool, chance for showers, upper 70’s

Sunday

Mainly sunny, still cool, upper 70's

Monday

Partly sunny, pleasant, chance for showers, near 80

Discussion

This morning's air mass is noticeably more humid than recent days and with the rise in humidity will be an increased chance for showers and thunderstorms by later in the afternoon. A frontal system has stalled in the southern part of the Mid-Atlantic region and a couple of disturbances will ride along the boundary zone during the next couple of days. As a result, the threat for scattered showers and thunderstorms that begins late today will continue right into Friday and there will be a cooling trend as go through the weekend. Temperatures will reach the mid-to-upper 80's today, but will likely be confined to the upper 70's for highs this weekend.

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