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Tropical Storm Isaias Local Statement Advisory Number 20

Status

Issued Expired

Start Time

Sat 08/01/2020 11:21 PM EDT

End Time

Sun 08/02/2020 08:00 AM EDT

Impacts

Informational

Full Alert Message

Tropical Storm Isaias Local Statement Advisory Number 20 National Weather Service Melbourne FL AL092020 1121 PM EDT Sat Aug 1 2020 This product covers East Central Florida **ISAIAS CONTINUES TO SLOWLY APPROACH THE SOUTHEAST FLORIDA COAST** NEW INFORMATION --------------- * CHANGES TO WATCHES AND WARNINGS: - None * CURRENT WATCHES AND WARNINGS: - A Hurricane Warning and Storm Surge Watch are in effect for Coastal Volusia, Indian River, Martin, Northern Brevard, Southern Brevard, and St. Lucie - A Tropical Storm Warning is in effect for Inland Volusia, Okeechobee, Orange, Osceola, and Seminole * STORM INFORMATION: - About 220 miles south-southeast of Cape Canaveral FL or about 130 miles south-southeast of Stuart FL - 25.5N 79.1W - Storm Intensity 70 mph - Movement Northwest or 310 degrees at 9 mph SITUATION OVERVIEW ------------------ A Hurricane Warning continues for all coastal counties of east central Florida. A Tropical Storm Warning remains in effect for Okeechobee, Osceola, Orange, Seminole and inland Volusia Counties. Tropical Storm Isaias, currently located about 80 miles ESE of Fort Lauderdale, is forecast to move northwest to north-northwest between the southeast Florida coast and Grand Bahama Island tonight through sunrise on Sunday, while re-strengthening back to a category one hurricane. Based on the latest forecast, Isaias is expected to be a category one hurricane as it moves north-northwest, parallel and very close to the east central Florida coast, weakening once again to a tropical storm as it nears Cape Canaveral. However, slight fluctuations of track and intensity may still occur and hurricane conditions are still possible along the coast, especially for the barrier islands. The center of Isaias is expected to make its closest point of approach to the Treasure Coast counties of Martin, Saint Lucie, and Indian River Sunday from 10 AM through 6 PM, the Brevard County coast from 6 PM Sunday through 2 AM Monday, then just offshore the Volusia County coast early Monday morning between 2 AM and sunrise. Tropical storm conditions will begin to reach coastal Martin County a little after midnight, then gradually spread northward across the Treasure and Space coasts during the morning, and coastal Volusia County by early afternoon. Hurricane conditions are still possible along the immediate coast, starting around mid morning in Martin County and spreading north along the Treasure Coast counties through late Sunday afternoon. These conditions will spread north along the Brevard County coast from around 5 PM Sunday through around midnight. Coastal Volusia County will experience strong tropical storm to near hurricane conditions from a little after midnight through sunrise Monday Rain bands with gusty squalls from Isaias currently impacting the Treasure Coast and Lake Okeechobee regions will increase and intensify while spreading northward tonight into Sunday night. Wind gusts of 40 to 50 mph will occur in some of the squalls along the coast this evening and will increase up to as high 70 to 80 mph as Isaias makes its closest approach. Farther inland, gusts could reach as high as 50 to 60 mph in squalls. Total rainfall amounts are expected to reach 3 to 5 inches along the coastal counties, decreasing to between 1 and 3 inches across the interior. Heavy rainfall is likely to cause flooding of urban and other poorly drained and low-lying areas. This is especially the case in Indian River, Saint Lucie and Martin Counties, where the late spring and summer were quite wet. A Storm Surge Watch remains in effect along the east central Florida coast. There is the potential for life threatening storm surge along portions of the immediate coast that are typically vulnerable to elevated ocean levels or where dune erosion has occurred. Low land flooding is also possible along the intracoastal waterways and in vulnerable low lands near inlets and other low areas near the coast. Long period swells from Isaias will will maintain a high risk for numerous strong rip currents through at least Sunday. Seas will build to dangerous levels of 20 feet or higher, with large breaking waves in excess of 7 feet. Engaging in any sort of boating or beach activity will be extremely dangerous, so stay away from the ocean and surf zone! Coupled with increasing astronomical high tides due to the approaching full moon, moderate to locally significant beach erosion will be likely during the next several high tide cycles. The next two high tide cycles on Sunday will be around 730 AM and again around 800 PM. Your personal hurricane safety plan for yourself and family should have been put into action. Continue to follow recommendations of your county emergency management officials, as well as the latest forecasts, statements and warnings from both the National Hurricane Center, and your National Weather Service office in Melbourne. POTENTIAL IMPACTS ----------------- * WIND: Protect against life-threatening wind having possible extensive impacts across all coastal counties of east central Florida. Potential impacts in this area include: - Considerable roof damage to sturdy buildings, with some having window, door, and garage door failures leading to structural damage. Mobile homes severely damaged, with some destroyed. Damage accentuated by airborne projectiles. Locations may be uninhabitable for weeks. - Many large trees snapped or uprooted along with fences and roadway signs blown over. - Some roads impassable from large debris, and more within urban or heavily wooded places. Several bridges, causeways, and access routes impassable. - Large areas with power and communications outages. Also, protect against dangerous wind having possible limited to significant impacts across Okeechobee, Osceola, Orange, Seminole and inland Volusia Counties. * FLOODING RAIN: Protect against locally hazardous rainfall flooding having possible limited impacts across East Central Florida. Potential impacts include: - Localized rainfall flooding may prompt a few evacuations. - Rivers and tributaries may quickly rise with swifter currents. Small streams, creeks, canals, and ditches may become swollen and overflow in spots. - Flood waters can enter a few structures, especially in usually vulnerable spots. A few places where rapid ponding of water occurs at underpasses, low-lying spots, and poor drainage areas. Several storm drains and retention ponds become near-full and begin to overflow. Some brief road and bridge closures. * SURGE: Protect against life-threatening surge having possible significant impacts along the east central Florida coast. Potential impacts in this area include: - Areas of inundation with storm surge flooding accentuated by waves. Damage to several buildings, mainly near the coast. - Sections of near-shore escape routes and secondary roads become weakened or washed out, especially in usually vulnerable low spots. - Major beach erosion with heavy surf breaching dunes. Strong and numerous rip currents. - Moderate damage to marinas, docks, boardwalks, and piers. Several small craft broken away from moorings, especially in unprotected anchorages. Elsewhere across East Central Florida, little to no impact is anticipated. * TORNADOES: Protect against a tornado event having possible limited impacts across coastal areas of Martin, Saint Lucie, Indian River, and Brevard Counties. Potential impacts include: - The occurrence of isolated tornadoes can hinder the execution of emergency plans during tropical events. - A few places may experience tornado damage, along with power and communications disruptions. - Locations could realize roofs peeled off buildings, chimneys toppled, mobile homes pushed off foundations or overturned, large tree tops and branches snapped off, shallow-rooted trees knocked over, moving vehicles blown off roads, and small boats pulled from moorings. Elsewhere across East Central Florida, little to no impact is anticipated. PRECAUTIONARY/PREPAREDNESS ACTIONS ---------------------------------- * OTHER PREPAREDNESS INFORMATION: Preparations to protect life and property in accordance with your emergency plan should be rushed to completion. Ensure you are in a safe location before the onset of strong winds or possible flooding. If you are a visitor, be sure to know the name of the city or town in which you are staying and the name of the county or parish in which it resides. Listen for these locations in local news updates. Pay attention for instructions from local authorities. Closely monitor weather.gov, NOAA Weather radio or local news outlets for official storm information. Be ready to adapt to possible changes to the forecast. Ensure you have multiple ways to receive weather warnings. * ADDITIONAL SOURCES OF INFORMATION: - For information on appropriate preparations see ready.gov - For information on creating an emergency plan see getagameplan.org - For additional disaster preparedness information see redcross.org NEXT UPDATE ----------- The next local statement will be issued by the National Weather Service in Melbourne FL around 600 AM EDT, or sooner if conditions warrant.