Active Monday

There is quite a bit of weather to look at today.

Cooler, less humid air has filtered into a portion of the Mid Atlantic region. A frontal boundary has stalled to the southeast of Maryland and Monday morning temperatures have been in the 60s. A disturbance is moving along that boundary and has pushed clouds over much of Maryland. Rain shower activity associated with the disturbance has remained south and east of the Baltimore-Washington area. With high pressure moving in from the Great Lakes, the rain area is expected to be held to the south and east of the metro areas. The high pressure will eventually win out and dry, pleasant weather is expected most of the week.

tropmonjej

The satellite image above shows the clouds associated with the weather disturbance over the east coast.

Two areas have been highlighted in the image above.

In the Atlantic, a tropical wave is showing increasing signs of organization and may very well become a tropical depression and perhaps eventually a named storm. The next name for Atlantic storms is Erika.

In the Pacific, powerful Hurricane Jimena continues to spin off the Mexican coast with category 4 winds of 145 mph. Jimena is headed for Baja, California.

Added at 12:30pm……..

I want to include this image from the Naval Research Laboratories in Monterey, CA.

20090831.0900.composite.SeaLevelPress_model_overlays_eatl_atlantic.x

The satellite image combines the sea level surface pressure isobars with the combined IR/visible satellite image from 5:00am Monday morning. Notice the large area of high pressure over the Atlantic Ocean. It is under the southern margin of this “Bermuda High” that the latest tropical wave is showing signs of organizing into another tropical depression or storm. When these large scale Atlantic ridges extend westward into the southeast and Mid Atlantic states, warm and muggy tropical conditions develop similar to the conditions the region experienced last week.

Another ridge of high pressure is centered over Iowa, Illinois and Wisconsin and extends eastward to the Atlantic coast. This is the air mass that has brought cooler, less humid conditions to Maryland. The “trough” of low pressure that is wedged between the Atlantic and Midwest ridges is the cloudy, unsettled weather that runs along the U.S. coastline. The dry air has moved far enough east that the rain associated with the “trough” has been confined to areas east and south of the Baltimore-Washington metro region.

By the way, the yellow “dots” in the cloud free areas of the U.S. on the satellite image are the city lights of metropolitan areas. The satellite image was taken before sunrise in the U.S.

John Collins

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