Saturday, January 24, 2009

AFTER A CHILLY BUT UNEVENTFUL WEEKEND, THINGS MAY GET A BIT INTERESTING AS WE START THE WORK WEEK

The forecast is pretty cut and dry for the weekend. As a cold front slowly sags southward through the Mid-Atlantic region, our winds will shift to the NW and then the N ushering in colder air. Some areas may see a sprinkle early Saturday but the main story is the falling temperatures. On Sunday, we may not get out of the thirties all day long. Then, things get interesting. A strong jet stream is expected to develop over our part of the country on Monday and it will be a mostly west to east (or zonal) flow. This will be the dividing line between the arctic air to the north and the relatively milder air to the south. Moisture will also be lurking well to our south through the week. Disturbances are expected to move east along this fast flowing jet stream with each one causing some precipitation. The questions are 1) What type of precipitation will fall?, 2) Where will the main area of precipiation be? 3) How heavy will the precipitation be? The first chance of precipitation is late Sunday night and early Monday. I will have an update on this first system in my Sunday morning post. It appears that each system will have its forecasting challenges throughout the week. After the forecasting fiasco earlier this past week, forecasters are probably very hesitant to predict wintry precipitation here locally in Hampton Roads.