The SI Weather
29Jul/14Tue

1:25 PM | Tropical activity in the eastern Atlantic

waves
[Latest visible satellite image of the tropical Atlantic Ocean; courtesy Penn State e-wall]

Discussion

All in all, the tropical season so far has been rather quiet in the Atlantic Basin given the frequency of wind shear over the Atlantic Ocean and the steady westward push of dry (Saharan-layer) air off of the west coast of Africa. There is now another tropical wave moving westward in the eastern Atlantic and it could develop into the second named system (Bertha) of the season later this week, but it will face some obstacles in its development.

dry_air
[Tuesday analysis of the Saharan Air Layer (SAL) using data from the Meteosat-9 satellite; courtesy University of Wisconsin - CIMSS]

First, this new wave will fight against some rather high wind shear in its vicinity later today and tonight. Varying wind speeds and directions with altitude (i.e., wind shear) is usually an inhibiting factor when it comes to the development of tropical systems. Second, as has been the case quite often this tropical season so far (and last year as well), dry air is pushing westward from western Africa and this wave has to endure more of this Saharan-layer dry air over the next couple of days (yellows, oranges; map courtesy University of Wisconsin - CIMSS). If it should survive the wind shear and dry air, this tropical wave would likely continue on a west-to-northwest path for the next few days and reach the Antilles Islands region of the eastern Caribbean Sea by the weekend. A second tropical wave follows close behind currently just off the west coast of Africa.

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29Jul/14Tue

7:00 AM | A comfortable air mass takes full control today

6-Day Forecast

Today

Mainly sunny, pleasant, highs near 80 degrees

Tonight

Partly cloudy, comfortable, lows by morning in the low-to-mid 60’s

Wednesday

Partly sunny, a bit warmer, but still comfortable, low 80’s

Wednesday Night

Partly cloudy, cool, mid 60’s

Thursday

Mostly sunny, pleasantly warm, mid 80’s

Friday

Partly sunny, more humid, chance for a shower or thunderstorm, low 80’s

Saturday

Mostly cloudy, cooler-than-normal, chance for showers and possibly a thunderstorm, near 80

Sunday

Mostly cloudy, humid, chance for showers and possibly a thunderstorm, low 80’s

Discussion

A strong cold front passed through the region yesterday paving the way for a stretch of very comfortable weather conditions. Temperatures today will have a hard time escaping the 70’s in much of the Mid-Atlantic region and the below-normal temperatures will continue through much of the week. Humidity levels will also be way down for the next couple of days, but will increase at the end of the week as an ocean flow develops.

Video

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29Jul/14Tue

7:00 AM | A comfortable air mass is now in control

6-Day Forecast

Today

Partly sunny, pleasant, an isolated shower cannot be ruled out, highs in the upper 70’s

Tonight

Mostly clear, comfortably cool, lows by morning in the mid-to-upper 50’s

Wednesday

Mostly sunny, a tad warmer, but still below-normal for this time of year, near 80

Wednesday Night

Mostly cloudy, cool, upper 50’s

Thursday

Mostly sunny, pleasant, low 80’s

Friday

Partly sunny, more humid, chance for a shower or thunderstorm, low 80’s

Saturday

Mostly cloudy, humid, still below-normal temperatures, chance for a couple of showers and a thunderstorm, near 80

Sunday

Mostly cloudy, still cooler-than-normal, chance for showers and thunderstorms, low 80's

Discussion

A strong cold front passed through the region yesterday paving the way for a stretch of very comfortable weather conditions. Temperatures today will have a hard time escaping the 70’s in much of the Mid-Atlantic region and the below-normal temperatures will continue through much of the week. Humidity levels will also be way down for the next couple of days, but will increase at the end of the week as an ocean flow develops.

Video

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29Jul/14Tue

7:00 AM | Great weather as we close out July

6-Day Forecast

Today

Mainly sunny, pleasant, highs in the upper 70’s

Tonight

Mostly clear, comfortably cool, lows by morning near 60 degrees

Wednesday

Mostly sunny, a tad warmer, but still cooler-than-normal for this time of year, low 80’s

Wednesday Night

Partly cloudy, cool, low 60's

Thursday

Mostly sunny, warmer, mid 80’s

Friday

Partly sunny, more humid, chance for a shower or thunderstorm, low 80’s

Saturday

Mostly cloudy, still cooler-than-normal, chance for a couple of showers and a thunderstorm, near 80

Sunday

Mostly cloudy, still cooler-than-normal, chance for showers and thunderstorms, low 80’s

Discussion

A strong cold front passed through the region yesterday paving the way for a stretch of very comfortable weather conditions. Temperatures today will have a hard time escaping the 70’s in much of the Mid-Atlantic region and the below-normal temperatures will continue through much of the week. Humidity levels will also be way down for the next couple of days, but will increase at the end of the week as an ocean flow develops.

Video

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