National Weather Service Watch Warning Advisory Summary
LA AL072018 453 PM CDT Mon Sep 3 2018 This product covers Southeast Louisiana and South Mississippi **HURRICANE WARNING ISSUED FOR PORTIONS OF THE CENTRAL GULF COAST** NEW INFORMATION --------------- * CHANGES TO WATCHES AND WARNINGS: - A Tropical Storm Warning has been issued for Northern Tangipahoa, Pike, and Walthall - The Hurricane Watch and Tropical Storm Warning have been upgraded to a Hurricane Warning for Hancock, Harrison, and Jackson * CURRENT WATCHES AND WARNINGS: - A Storm Surge Warning and Hurricane Warning are in effect for Hancock, Harrison, and Jackson - A Tropical Storm Warning and Storm Surge Watch are in effect for Lower Plaquemines - A Storm Surge Warning and Tropical Storm Warning are in effect for Lower St. Bernard, Orleans, St. Tammany, and Upper St. Bernard - A Tropical Storm Warning is in effect for Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Lower Jefferson, Lower Lafourche, Lower Terrebonne, Northern Tangipahoa, Pearl River, Pike, Southern Tangipahoa, St. Charles, St. James, St. John The Baptist, Upper Jefferson, Upper Lafourche, Upper Plaquemines, Upper Terrebonne, Walthall, Washington, and West Baton Rouge * STORM INFORMATION: - About 530 miles east-southeast of New Orleans LA or about 490 miles southeast of Gulfport MS - 26.2N 82.6W - Storm Intensity 50 mph - Movement West-northwest or 300 degrees at 17 mph SITUATION OVERVIEW ------------------ OVERVIEW...At 400 PM CDT, Tropical Storm Gordon was centered near 26.2 North, longitude 82.6 West. The system is moving toward the west-northwest near 17 mph (28 km/h), and this general motion is expected to continue through Thursday. On the forecast track, the center of Gordon will move across the eastern Gulf of Mexico tonight and Tuesday, approach the central Gulf Coast late Tuesday or Tuesday night, and move inland over the lower Mississippi Valley on Wednesday. The primary impact will be significant tropical storm force winds across portions of southeast Louisiana and the Mississippi coast by late Tuesday, with hurricane conditions expected in the Hurricane Warning area late Tuesday or Tuesday night. Secondary threats are heavy rainfall of 4 to 7 inches with locally higher amounts, and storm surge of 3 to 5 feet, primarily along the Mississippi coast and Lake Borgne, 2 to 4 feet of surge is expected to the mouth of the Mississippi River and 1 to 2 feet along the Louisiana coast to the west of the mouth of the Mississippi River, as well as Lake Pontchartrain and Lake Maurepas. POTENTIAL IMPACTS ----------------- * WIND: Protect against life-threatening wind having possible extensive impacts across portions of southeast Louisiana and southern Mississippi, primarily east of a McComb to Slidell line. 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 the rest of southeast Louisiana and southern Mississippi. * SURGE: Protect against life-threatening surge having possible significant impacts across the Mississippi coast, as well as the Louisiana coast from Shell Beach to the mouth of the Mississippi River. 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. Also, protect against locally hazardous surge having possible limited impacts elsewhere along the Louisiana coast, including Lakes Maurepas and Pontchartrain. * FLOODING RAIN: Protect against dangerous rainfall flooding having possible significant impacts across portions of southern Mississippi and southeast Louisiana mainly east of a McComb to Slidell line. Potential impacts include: - Moderate rainfall flooding may prompt several evacuations and rescues. - Rivers and tributaries may quickly become swollen with swifter currents and overspill their banks in a few places, especially in usually vulnerable spots. Small streams, creeks, canals, and ditches overflow. - Flood waters can enter some structures or weaken foundations. Several places may experience expanded areas of rapid inundation at underpasses, low-lying spots, and poor drainage areas. Some streets and parking lots take on moving water as storm drains and retention ponds overflow. Driving conditions become hazardous. Some road and bridge closures. Protect against locally hazardous rainfall flooding having possible limited impacts across the remainder of southern Mississippi and southeast Louisiana. * TORNADOES: Protect against a tornado event having possible limited impacts across portions of southern Mississippi and southeast Louisiana, mainly east of a McComb to Slidell line. 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 Southeast Louisiana and South Mississippi, little to no impact is anticipated. PRECAUTIONARY/PREPAREDNESS ACTIONS ---------------------------------- * EVACUATIONS: WATCH/WARNING PHASE - Listen to local official for recommended preparedness actions, including possible evacuation. If ordered to evacuate, do so immediately. WATCH/WARNING PHASE - For those not under evacuation orders, assess the risk from wind, falling trees, and flooding at your location. If you decide to move, relocate to a safer location nearby. If you do not relocate, help keep roadways open for those under evacuation orders. WATCH/WARNING PHASE - Let others know where you are going prior to departure. Secure loose items and pets in the car, and avoid distracted driving. * OTHER PREPAREDNESS INFORMATION: Now is the time to complete all preparations to protect life and property in accordance with your emergency plan. Ensure you are in a safe location before the onset of strong winds or possible flooding. If you are relocating to safe shelter, leave as early as possible. Allow extra time to reach your destination. Many roads and bridges will be closed once strong winds arrive. Check the latest weather forecast before departing and drive with caution. It is important to remain calm, informed, and focused during an emergency. Be patient and helpful with those you encounter. 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. If in a place that is vulnerable to high wind, such as near large trees, a manufactured home, upper floors of a high-rise building, or on a boat, consider moving to a safer shelter before the onset of strong winds or flooding. 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 New Orleans LA around 1030 PM CDT, or sooner if conditions warrant.