WEATHER BLOG: Wet

High pressure off the Northeast Coast will depart and yield to a weak jet stream disturbance moving slowly north along the Mid-Atlantic Coast. Clouds from this disturbance will obscure the sun while a few showers and perhaps a rumble of thunder also occur. The threat for a few showers, perhaps accompanied by thunder, will persist into Monday and early Tuesday as the slow-moving cold front passes. During this period, the highest chances for rain will occur in 3 separate periods: 1) Sunday morning into the midday, 2) Monday morning and again 3) Tuesday morning to mid-afternoon. High pressure will then arrive from the Great Lakes later Tuesday bringing a return to drier, much less humid conditions at night.

Speaking of Tuesday, this should be the day that expected Hurricane Isaac makes landfall somewhere along the Gulf Coast, probably as a Cat 2 packing peak winds of around 100 miles. Prior to this, the storm will swipe the Florida Keys with winds approaching hurricane force (74 mph) later Sunday afternoon and evening. The models are in large disagreement with regard to the long range movement of Isaac, but chances are a much, much weakened version of the storm will bring some clouds and showers to the region for a 24 hour period sometime late next week or over the weekend ... although there are solutions that stall the storm over the South, where it dissipates and eventually exits the SE Seaboard in a feeble state without even
impacting the metro area.

BOTTOM LINE: A lot of uncertainty exists with how Isaac (if at all) will affect our area. Nonetheless, expect some places in the Deep South near the Mississippi/Alabama border to get double digit rainfall (locally 20") with widespread flooding.