December 10th, 2008 by Steven DiMartino
So far the overall forecast is going well in the timing and structure of the overall low pressure system over the Gulf Coast. The phase, so close yet so far away, has never meant more than what we are seeing in the water vapor images and the surface features.
At 500 MB, the shortwave associated [...]
October 23rd, 2008 by Steven DiMartino
First, I just want to mention that I have updated the 2008/9 winter forecast with graphical explanations and illustrations for storm tracks.
Model guidance now comes into strong support for a very chilly end of October as the NAO tanks along with the AO, which means some very cold 850 MB temperatures will be setting [...]
October 21st, 2008 by Steven DiMartino
I’m sure everyone got a good look at the 12Z model guidance and how different the GFS and ECMWF were for the end of this up coming 10 day period.
Let’s break down what we are looking at with the two maps on the left. These maps can be found at the Penn State E-wall, [...]
October 8th, 2008 by Steven DiMartino
This evening the latest water vapor images show the disturbance that has been over the Great Lakes splitting into two distinct disturbance. The first is moving towards New England with scattered showers extending down through Pennsylvania. This area of showers will move through much of the northern half of the forecast area through the overnight, [...]
October 7th, 2008 by Steven DiMartino
The model guidance this evening is giving us a prime example on how a strong ridge in the East doesn’t always translate to warm conditions for the forecast area.
The rainfall currently over the Ohio Valley will weaken as the upper trough supporting the rainfall splits and weakens. Much of the PVA associated with this rainfall [...]
September 30th, 2008 by Steven DiMartino
The main action for the rest of the week is currently about to move through the forecast area in the form of showers and a few isolated thunderstorms. The cold front will linger over the forecast area through the morning hours with slow clearing and a risk of isolated showers through Wednesday afternoon.
The moisture off [...]