post from Met w/Harris Co Flood District
Posted by
cypresstx on 6/15/2015, 2:22 pm
fyi - SH87 is aka Bluewater Hwy - we almost rented a cabin there this wk-end - glad our possible visitors went to Vegas instead !!!
Galveston County has requested the voluntary evacuation of the Bolivar Peninsula due to the potential for flooding of SH 87 and overwash of portions of the peninsula.
National Hurricane Center has run its SLOSH modeling for 91L and we have a little better guidance on tides and impacts.
Current large fetch ESE to SE winds will push sea water and increasing seas (6-12 ft) toward the upper TX coast. Combined effect of onshore winds and transport of water toward the coast will result in tides rising to between 4.0-5.0 ft above MLLW or 2.0-3.0 ft above MSL.
Checking various tide sites in along the coast and in Galveston Bay show the previous tides are being trapped in the NW portion of Galveston Bay. Water levels are running 1-2 ft above normal in the Bay and 1.0-1.5 ft along the Gulf beaches.
Latest data from NHC following the new inundation mapping for coastal storm surge shows water levels reaching 1-2 ft above ground level around the Tuesday morning high tide (300-700am) along the west end of Galveston Island, Bolivar, and the west side of Galveston Bay (Seabrook and Kemah). Tides within Clear Lake may reach 3.0ft-4.0ft which will be close to impact some roadways near and around the lake and possibly along Taylor's Bayou in Shoreacres.
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