Isolated showers and thunderstorms will affect spots in the Southwest States as a cold low pressure in the upper atmosphere spirals sluggishly east from the offshore waters of Baja California.
12.
This system is typically an upper-level cold low with circulation extending to the surface layer and maximum sustained winds generally occurring at a radius of about 100 miles or more from the center.
13.
The reversal of the normal north-to-south distribution of temperatures was accompanied by a topsy-turvy distribution in barometric pressure, with a warm high over the Great Lakes and a cold low over the Southeast.
14.
Variable clouds with widely separated cool showers will prevail from the eastern Great Lakes region to the northern and central Appalachians as a sluggish, cold low pressure system at high altitudes drifts overhead.
15.
On Friday, the lofty cold low will continue to produce pockets of mountain snows across the southern Rockies as its eastward advance remains blocked by a massive high pressure system covering the Middle West.
