Tag Archive for 'central canada'
January 25th, 2010 by Steven DiMartino
7:32 AM
This morning, an impressive cold front is moving through central Pennsylvania and producing heavy rainfall throughout the Philadelphia and New York City metropolitan areas. The cold front will continue to progress east this morning and exit the New Jersey coast by 12 PM and eastern Long Island by 2 PM. The rainfall with this [...]
January 3rd, 2010 by Steven DiMartino
11:30 AM
If you want to see what a developing strong negative NAO pattern looks like, take a look at this morning’s water vapor satellite image. The upper low associated with the coastal storm off the New England coast is clearly dominating the weather pattern for the much of the Northeast and Mid Atlantic. The upper [...]
December 7th, 2009 by Steven DiMartino
7:23 AM
This morning an energetic disturbance over the Ohio Valley is racing east, slightly faster than most model guidance have projected, and is producing light snow showers over parts of western Pennsylvania. This disturbance will continue to move east, but will run into the surface high pressure currently sitting over the Philadelphia and New York [...]
December 6th, 2009 by Steven DiMartino
10:07 AM
The storm that produced a light to moderate snowfall over much of the northern Mid Atlantic yesterday (review issued this afternoon), surface high pressure has taken hold. The snow storm from yesterday marked another step down into what is looking to be very cold and active end of December. As the low pressure system [...]
October 8th, 2009 by Steven DiMartino
5:15 AM
The cold front that moved through the forecast area yesterday is the first of several disturbances that will continue the step down to a cool, fall regime over much of the Mid Atlantic and especially the Philadelphia and New York City metropolitan areas.
By this afternoon, a ridge axis will move over the forecast area [...]
September 21st, 2009 by Steven DiMartino
5:15 AM
The pattern continues to go through a long term shift as the cold pattern unfolds. This process usually takes several weeks to play out, and in this time period the New York City and Philadelphia metropolitan areas will luck out with some rather comfortable conditions, although a bit on the wet side at times.
This [...]
September 20th, 2009 by Steven DiMartino
5:15 AM
The pattern going forward is becoming less complicated as guidance comes into agreement with making the upper low over the Mississippi Valley less of a factor for the region.
High pressure will slowly slide to the east of the region through this afternoon, overnight, and through Monday. As a result, winds will redevelop out of [...]
August 31st, 2009 by Steven DiMartino
5:15 AM
The start of September is going to be unlike any weather conditions seen this summer, namely dry. High pressure over the Great Lakes will dominate the Mid Atlantic and New England through the next several days. The high pressure system is from central Canada and is bringing a dry, cool air mass into the [...]
July 13th, 2009 by Steven DiMartino
6:50 AM
High pressure this morning over the Great Lakes is slowly building into the forecast area and providing the region with clear skies, light winds, and comfortable temperatures. The cool high pressure system from central Canada is supported by strong convergence and confluence at 500 MB, which is producing strong subsidence over the region. Clear [...]
January 18th, 2009 by Steven DiMartino
10:05 AM
I want to discuss a few ideas for this upcoming week, as I will naturally be focusing on the short range the rest of the day.
The pattern is changing, that’s for certain. However, I think my idea of a moderation for the end of January into early February is going to be wrong. Oh, [...]