Communities from Lake Charles, La., to Mobile, Ala., are feeling the effects of Isaac with conditions deteriorating into Tuesday night.
Isaac showed signs of strengthening Tuesday morning with an eye forming and flight-level winds from aircraft increasing.
Isaac finally became a hurricane Tuesday midday after traveling thousands of miles since emerging off the coast of Africa.
Landfall along the southern coast of Louisiana is forecast by AccuWeather.com Tuesday night, considering that the center may brush the coast for a time while moving west-northwest.
A larger version of the latest forecast track map for Isaac (with times in EDT) can be found on the AccuWeather Hurricane Center.
Ironically, Isaac is expected to threaten lives and property along the northern Gulf Coast almost seven years to the date of Hurricane Katrina's devastating landfall.
As the AccuWeather.com Hurricane Center has been calling for since last Thursday, Isaac is expected to slam into the northern Gulf Coast Tuesday afternoon or evening as strong as a category 1 hurricane (with maximum sustained winds between 96 and 110 mph).
A developing split between high pressure over the interior United States is directing Isaac toward the Louisiana Coast Tuesday and Tuesday night.
Isaac will pound those in its path with destructive winds, widespread flooding rain and perhaps isolated tornadoes.
A track into southeastern Louisiana would spell trouble for New Orleans, Biloxi and Mobile in terms of storm surge.
Such a track will still cause water from Lake Pontchartrain to put stress on the city's levee system.
Winds circulating around Isaac would still funnel some water from the Gulf of Mexico directly into Mobile, via Mobile Bay.
With Isaac's path will drive significant storm surge around Houma and Morgan City, La. Tuesday night.
Those at risk of taking a direct hit by Isaac should closely monitor the progress of the storm, heed all evacuation orders and avoid flood-prone areas.
The dangers of Isaac will not end when the storm makes its final landfall. Flooding rain and the potential for isolated tornadoes will accompany Isaac inland through the South.
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Colder-than-average temperatures will hold around Washington, D.C., and Baltimore into the weekend as a couple of storm systems approach.
Colder-than-average temperatures will hold around Harrisburg, Pennsylvania into the weekend as a couple of storm systems approach.
As it became obvious on Saturday that a major blizzard was going to hit the Northeast, the track and size of the storm became critical as to which areas would be hit the hardest.
Communities across the Northeast have endured heavy snow and fierce winds amid the first blizzard of 2015 with the storm continuing to churn over New England.
Lingering midwinter cold and additional rounds of snow will add to difficulties for cleanup and those without power after the Blizzard of 2015.
Southern California (1990)
trong Santa Ana winds -- 112 mph at Laguna Peak.
High winds; 60-100 mph winds atop Mauna Loa and Mauna Kea volcanoes; 67-mph gust at west Maui.
Crown Point, NY (1994)
-48 degrees - lowest temperature recorded in lower 48 degrees in January 1994.