Why is flooding likely early Friday?

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BRIDGEPORT, W. Va. (WDTV) - Rain last weekend brought about 1.00" to many locations and this has laid the groundwork for Flooding Friday. Rain on Wednesday totaled about 0.50" in many places and showers brought light rain totals Thursday.
However, a large chunk of rain in less than 12 hours Friday morning means flooding is likely.

This current storm system also has a lot of moisture to work with. We're talking 'humidity' here. When we measure humidity, we use the 'dew point'. This is the temperature the air must drop to for clouds to form. The higher the number, the more moisture in the air, the more humid it feels. As of Thursday evening, these numbers were in the upper 50s and lower 60s. For February, this is high.

One reason is that the low-level winds over the last couple of days have been strong and generally from a south or southwesterly direction. This is pumping Gulf of Mexico moisture north. Our low pressure system will squeeze this out and bring heavy rain.