The SI Weather
17Apr/14Thu

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

6-Day Forecast

Today

Mostly sunny skies, windy, chilly, highs in the low 50’s

Tonight

Increasing clouds, cold, lows by morning in the mid 30’s

Friday

More clous than sun, still breezy and chilly, maybe a sprinkle, low-to-mid 50’s

Friday Night

Mostly cloudy, chilly, maybe a light shower, low 40’s

Saturday

Partly sunny, a bit milder, low 60's

Sunday

Mostly sunny, comfortable, near 60

Monday

Mostly cloudy, milder, mid 60's

Tuesday

Mostly cloudy, mild, chance for showers, mid 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 | Amazing chill has arrived following a touch of sleet and snow; way below normal temperatures for this time of year following the recent warm spurt

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 mid-to-upper 40’s (normal high is now 61 degrees at Central Park)

Tonight

Mostly clear and cold, patchy frost towards morning in the suburbs, lows by morning in the low-to-mid 30’s

Thursday

Patchy frost early in the suburbs; otherwise, mostly sunny and chilly, low 50’s

Thursday Night

Partly cloudy, cold, mid 30’s

Friday

Partly sunny, still cool, maybe a shower, low-to-mid 50’s

Saturday

More clouds than sun, a tad milder, just a chance for a shower, mid-to-upper 50’s

Sunday

Partly sunny, cool, upper 50’s

Monday

Partly sunny, mild, 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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15Apr/14Tue

12:55 PM | **Temperature plunge to arrive by early evening in the big cities along the I-95 corridor**

PA_temps
[Noon temperatures across Pennsylvania; courtesy Penn State Campus Weather Service]

Discussion

The latest observations show a divided state of Pennsylvania with spring hanging on in the eastern half and “winter’s revenge” taking hold in the western half. Heavy rain continues to fall on the warm side of a powerful cold front now crossing the state from west-to-east, but snow is now falling on the cold side from Bradford, PA southward to Johnstown, PA and Clarksburg, WV - some of this snow will spread to the east side of the Appalachian Mountains later tonight.

By the end of the afternoon, the strong cold front will pass through the big cities along the I-95 corridor and temperatures will begin a sharp drop from the current still rather mild levels. Lingering rain showers this evening could very well mix with or change to sleet and/or snow in the I-95 corridor during the late evening and overnight hours. Temperatures by morning will be at or below freezing throughout the Mid-Atlantic region with some record lows possible and frost is likely to threaten the region early Thursday morning after a chilly day on Wednesday.

PA_radar
[Noon radar across Pennsylvania; courtesy Penn State Campus Weather Service]

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