Temperatures of 100 degrees were noted Friday in parts of Texas for the 10th straight day as a warm high pressure system remained fixed over the region.
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The early summer pattern near North America has been dominated by two prominent zones of warm high pressure; one centered in the Plains and another near Bermuda.
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High heat and humidity will continue to stifle the Great Lakes and upper Mississippi Valley as an expansive ridge of warm high pressure holds steady over the region.
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During much of this spring, the northern Great Lakes have been dominated by a relatively warm high pressure system that has shunted rain-producing storms south toward the Ohio Valley.
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Tuesday, the unyielding warm high, which has orchestrated a rainless streak of 18 consecutive days at Salem, Ore ., will finally be nudged east by a weak disturbance from the Pacific.
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This weekend, the warm high-pressure system that has embraced southern California will shift eastward, allowing a slow-moving low-pressure system to come ashore from the Pacific, setting the stage for cooler, wetter weather.
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Unseasonable warmth will build along the Middle Atlantic and Southeast seaboards as a warm high-pressure system off the Georgia coast holds its ground against the advance of the cool front in the Northeast.
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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.
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The lack of heat in the Far West has resulted, in part, from the absence of warm high-pressure systems over the region, allowing cloudy low-pressure systems from the Pacific to regularly tamp down daytime temperatures.
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The typical distance between the warm high pressure zones and cool, stormy regions is about 1, 500 to 2, 000 miles which, by coincidence, is the distance from the western to the eastern part of the nation.
