Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

A cold front will cross the Great Lakes and Northeast U.S. through Monday with gusty winds and areas of rain showers. A strong atmospheric river is expected to move into the Pacific Northwest by midweek bringing a threat for moderate to heavy rainfall, gusty winds, and mountain snows for parts of Washington, Oregon, northern California, and the Sierra Nevada. Read More >

When you woke up this morning, you noticed that the ground and especially the pavement was wet. So you would have concluded that it rained last night. However, if you had a rain gage, you would have seen that it was bone dry. Where did the water come from?

The record breaking warm air mass with brisk southerly breezes was the key. Temperatures overnight were near record levels and the dew point was only about 5 degrees cooler. This meant that the pavement was cooler than the dew point, so dew formed. Normally, in this situation dense fog would have formed like it did earlier this week. However, the southerly winds were too strong to let that happen, and in fact, dried out many elevated surfaces. Thus, mainly the pavement was wet.

Above is a photo of the NWS driveway taken this morning. You can see the wet pavement including some small puddles toward the right. The shrub on the left was dry.

Numerous temperature records will be broken today, both warm minimums as well as warm maximums.

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Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

When Did It Rain Last Night?