Signature | NY NJ PA Weather Forecasts

Another Cool And Cloudy March Day

March 10th, 2009 by Steven DiMartino

6:02 AM
High pressure is currently over southern New England and is sliding to the northeast this morning, which is producing a northeasterly wind from the surface to 800 MB over the forecast area. This is producing strong moisture air advection over much of the coastal plain, thus the overcast conditions. However, as the high pressure [...]

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Is Winter Over? Not By A Long Shot!

February 4th, 2009 by Steven DiMartino

7:18 AM
I’ve gotten a lot of emails the past 24 hours if this is it? Is this the big storm and then winter is over? Well, let’s look at all the data. I know many people like to focus on the Pacific and only the Pacific, but I like to take a more round about [...]

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Watching The Pressure Trends

January 27th, 2009 by Steven DiMartino

7:19 AM
This morning, a defined CAD signature is developing over the southern Mid Atlantic as snow is falling from Washington, D.C. to southern Pennsylvania. Why is the CAD so important?
My concern going into tomorrow morning is not so much heavy snow, which there will be, but for the potential for a significant ice event. [...]

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Another Tough Forecast On The Way

January 26th, 2009 by Steven DiMartino

7:30 AM
You know, I would love to forecast an all snow event at some point. Just look at the QPF, multiply by 10 or 12, then here’s the snow map. Oh no, not this winter. haha
Model guidance is still all over the place on exactly how this storm will play out for the forecast area, [...]

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Quick 00Z NAM/21Z SREF Thoughts

January 25th, 2009 by Steven DiMartino

9:49 PM
I got most of the data in from the 00Z NAM and 21Z SREF guidance in. The idea from these guidances is a light to moderate snow starting Tuesday morning through early Wednesday morning followed by a snow/ice mix to the west of I-95 and a snow/ice/rain to the east of I-95. The position [...]

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Thoughts For Sunday Night

January 14th, 2009 by Steven DiMartino

9:10 PM
As I was alluding to this morning, model guidance is wavering on how to handle the intensifying trough and the large strong disturbance that will be diving towards the Mid Atlantic on Sunday and exploding somewhere off the coast on Sunday night into Monday.
As a forecaster, I know that trying to nail down details [...]

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Active Pattern Unfolding

January 3rd, 2009 by Steven DiMartino

8:00 AM
I want to deal with a few issues before going into the forecast.
First, the strong NAO is not a pattern that supports significant winter storms usually. It is the change from one NAO state to another that tends to support large winter storms. The best case scenario is a weak, negative NAO or a [...]

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The January Outlook

January 1st, 2009 by Steven DiMartino

7:40 PM
December has come and gone along with all the holiday cheer, it’s time to look to see what the rest of January holds for the forecast area. Will the negative NAO be a major factor? Will the Pacific get back into the game or will January be a warm and boring month?
The basic idea [...]

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