Hurricane Irma: Best guess on times/impacts | The Press and Standard

by | September 7, 2017 2:35 pm

From Colleton County Emergency Preparedness:

Hurricane Irma
Issued: 9/7/2017 at 1 pm
Issued by: WFO Charleston SC
…Hurricane Irma May Bring Major Impacts to GA and SC Early Next Week…
OVERVIEW
Hurricane Irma is forecast to turn toward the north Saturday afternoon or night. On the latest forecast path, Irma is expected to pass over or near southeast Florida on Sunday, then toward the Georgia and South Carolina coasts very early next week. Hurricane Irma may begin to directly impact our region Sunday, and impacts will likely continue into Tuesday. Due to uncertainty regarding the exact track and intensity of Irma as it approaches our area, we cannot yet precisely pin down the magnitude or location of the impacts. However, we should prepare for the potential for major, land-falling hurricane late this weekend into early next week. More information can be found at the NWS Charleston Tropical page.

CURRENT WATCHES, WARNINGS AND/OR ADVISORIES
Small Craft Advisory for the Georgia waters from 20 to 60 NM offshore

EXPECTED IMPACTS (INCLUDES TIMING AND LOCATION)
TIDES & STORM SURGE: Prior to the arrival of Hurricane Irma’s circulation later this weekend, elevated northeast winds will maintain elevated water levels near the coast. Then, as Hurricane Irma approaches late this weekend into early next week, water levels should further increase. Eventually, assuming Irma makes landfall along our coast early next week, dangerous storm surge inundation, commensurate with a major hurricane, could push onshore, especially into areas along and east of where the hurricane makes landfall. In these areas, storm surge inundation could cover most barrier islands, and even penetrate well inland.
WINDS: There is potential for major wind damage to trees and structures, as well as widespread power outages Sunday night into early Tuesday. Strongest winds should occur near the coast, but damaging winds could extend well inland.
HEAVY RAIN: There is the potential for significant amounts of rainfall that could result in flash flooding Sunday into Monday night. Storm total rainfall amounts may range from 5 to 7 inches inland to 9 to 11 inches near the coast.
Longer-term flooding of some rivers will be possible even after the hurricane exits the region.
MARINE: Sea conditions will begin to deteriorate as early as later tonight and Friday. However, the potential for very dangerous navigation conditions are expected Saturday night into Tuesday
TORNADOES: Short-track tornadoes are possible north and east of the storm center.

POTENTIAL TIMING OF TROPICAL STORM FORCE WINDS
Earliest Reasonable Arrival Time: Sunday evening for GA and into SC.
Most Likely Arrival Time: Early Monday GA and into SC.

CONFIDENCE
Low to Moderate regarding track, timing and strength. Moderate regarding rainfall.

RECOVERY PHASE WEATHER ISSUES
Main stem river flooding could persist after the storm. No major weather impacts expected for several days after Irma.

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