The SI Weather
18Apr/14Fri

7:00 AM | Decent weekend as temperatures will modify

6-Day Forecast

Today

More clouds than sun, still cool with light E-SE winds, highs in the mid 50’s

Tonight

Mostly cloudy, chilly, lows by morning in the upper 30’s

Saturday

Becoming mostly sunny, a bit milder, low-to-mid 60’s

Saturday Night

Partly cloudy, chilly, upper 30’s

Sunday

Partly-to-mostly sunny, comfortably cool, low 60’s

Monday

Mostly sunny, milder, upper 60’s

Tuesday

Mostly cloudy, mild, showers likely later in the day or at night, upper 60’s

Wednesday

Partly sunny, breezy, cooler, low 60’s

Discussion

Strong high pressure just off the New England coastline has generated an ocean flow of air (low-level E-SE winds) in the region and this has resulted in clouds pushing in from the east. This rather moist flow of air will, in fact, help to keep copious amounts of clouds around the region right through tonight and temperatures will stay on the cool side as ocean temperatures are still quite chilly this time of year. A frontal system will cross the region early Saturday changing our wind direction and a new high pressure system will subsequently build into the region from eastern Canada for Sunday and Monday. Another frontal system will then approach on Tuesday bringing with it a good chance of showers for the Mid-Atlantic region. Looking ahead, it appears there will be another shot of cold air for the Northeast US as we work our way through the last week of the month.

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17Apr/14Thu

7:00 AM | Still on the cool side despite plenty of sunshine

6-Day Forecast

Today

Patchy frost early; otherwise, mostly sunny skies, chilly, highs in the mid 50’s

Tonight

Increasing clouds, cold, patchy frost possible late, lows by morning in the low 30’s

Friday

More clouds than sun, still chilly, low-to-mid 50’s

Friday Night

Mostly cloudy, cold, upper 30's

Saturday

Partly sunny, a bit milder, low 60's

Sunday

Mostly sunny, comfortable, low 60's

Monday

Partly sunny, mild, mid-to-upper 60’s

Tuesday

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

Discussion

Strong high pressure across New England will gradually slide off the coast today and a clockwise of flow around it will develop a strengthening ocean flow of air into our area. As a result, clouds will increase later tonight and tomorrow should feature more clouds than sun. In addition, temperatures will stay on the relatively cool side given the still chilly ocean temperatures just to our east. A cool front will move through the region on Saturday – likely on the dry side - and then more high pressure will take control of our weather for Sunday and Monday. The next front approaches the region by Tuesday and this should renew our chances for showers. One fly in the ointment for the weekend will be a developing late week low pressure system near the Southeast US coastline. It currently looks like it will slide off to our southeast and not impact our weekend weather in the I-95 corridor, but it still has to be closely monitored.

Video

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16Apr/14Wed

2:00 PM | More on the impressive cold

snow

[Snow cover today as seen by NASA/MODIS satellite across the Northeast and New England (still ice on Lake Erie)]

Discussion

This late season widespread cold wave has produced some impressive results:

1) 30’s or lower this morning for low temperatures in all of the 48 contiguous states

2) It has never been this cold so late in the year in many locations including the following: Binghamton, NY (19°), DuBois, PA (19°), Canton, OH (21°) and Syracuse, NY (22°)

3) Chicago received the most snow ever (1.4”) within three days of reaching 80 degrees

4) 1PM temperature today at Reagan National Airport (DCA) was 46 degrees despite the “August-equivalent” full sunshine (normal high is 66°)

5) Marquette, Michigan reached a record low this morning of 5° BELOW ZERO

6) The current ice cover extent of the Great Lakes is nearly 40% - never has it been above 20% this late in the year since satellite records began (1980)

7) Snow yesterday in Detroit put them over the top for "snowiest winter ever" which breaks the previous record set in 1880-1881

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16Apr/14Wed

7:00 AM | The amazing chill has arrived; temperatures way below normal for this time of year, but modify back to normal levels by the weekend

records

[Widespread record or near record cold; map courtesy coolwx.com]

6-Day Forecast

Today

Mostly sunny, breezy and very chilly for this time of year, highs confined to the upper 40’s (normal high is now 63 degrees at PHL)

Tonight

Mostly clear and cold, patchy frost towards morning, lows by morning in the upper 20’s

Thursday

Patchy frost early; otherwise, mostly sunny and chilly, low-to-mid 50’s

Thursday Night

Becoming mostly cloudy, cold, low-to-mid 30's

Friday

Mostly cloudy, chilly, mid 50’s

Saturday

More clouds than sun, just a chance for a shower, cool, upper 50’s

Sunday

Partly sunny, breezy, cool, upper 50’s

Monday

Increasing clouds, milder, chance for showers at night, low 60's

Discussion

A touch of sleet and snow indeed reached portions of the big cities last night along the I-95 corridor from DC-to-Philly-to-New York City. This puts an exclamation point on what was already a long and cold winter season with many Mid-Atlantic locations receiving the first snowfall back in early November and now the last snowfall (hopefully) in mid-April. The cold this morning is very unusual as well for this time of year with apparent record lows in the following Mid-Atlantic locations (and this is just a small sampling): Lancaster, PA (28 degrees), Harrisburg, PA (30 degrees), Allentown, PA (27 degrees), JFK Airport in NYC (32 degrees), Andrews AFB in DC metro region (32 degrees) and Scranton, PA (23 degrees).

It’ll stay on the chilly side today with those well below normal temperatures despite plenty of sunshine. Another cold night is on the way and patchy frost is quite likely in the northern and western suburbs towards morning. Temperatures will modify by the weekend back to near seasonal levels for this time of year.

Video

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