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Summary for Tropical Storm Sally (AT4/AL192020)
2020-09-13 13:57:06| National Hurricane Center (Atlantic)
...HEAVY RAINS FROM SALLY SPREADING NORTHWARD ALONG THE SOUTHWEST COAST OF FLORIDA... As of 8:00 AM EDT Sun Sep 13 the center of Sally was located near 27.3, -84.6 with movement WNW at 13 mph. The minimum central pressure was 996 mb with maximum sustained winds of about 50 mph.
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Tropical Storm Sally Public Advisory Number 7A
2020-09-13 13:57:06| National Hurricane Center (Atlantic)
Issued at 800 AM EDT Sun Sep 13 2020 000 WTNT34 KNHC 131156 TCPAT4 BULLETIN Tropical Storm Sally Intermediate Advisory Number 7A NWS National Hurricane Center Miami FL AL192020 800 AM EDT Sun Sep 13 2020 ...HEAVY RAINS FROM SALLY SPREADING NORTHWARD ALONG THE SOUTHWEST COAST OF FLORIDA... SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...27.3N 84.6W ABOUT 155 MI...250 KM W OF PORT CHARLOTTE FLORIDA ABOUT 300 MI...485 KM ESE OF THE MOUTH OF THE MISSISSIPPI RIVER MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...WNW OR 300 DEGREES AT 13 MPH...20 KM/H MINIMUM CENTRAL PRESSURE...996 MB...29.41 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Port Fourchon Louisiana to the Mississippi/Alabama Border * Lake Pontchartrain, Lake Maurepas, and Lake Borgne A Hurricane Warning is in effect for... * Grand Isle Louisiana to Ocean Springs Mississippi * Lake Pontchartrain and Lake Maurepas including metropolitan New Orleans A Storm Surge Watch is in effect for... * Mississippi/Alabama Border to the Alabama/Florida Border A Hurricane Watch is in effect for... * East of Ocean Springs to the Alabama/Florida Border A Tropical Storm Warning is in effect for... * East of Ocean Springs to Indian Pass A Tropical Storm Watch is in effect for... * Indian Pass to Ochlockonee River Florida A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A warning is typically issued 36 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Storm Surge Watch means there is a possibility of life- threatening inundation, from rising water moving inland from the coastline, in the indicated locations during the next 48 hours. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. A Hurricane Watch means that hurricane conditions are possible within the watch area. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, in this case within 12 to 24 hours. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 800 AM EDT (1200 UTC), the center of Tropical Storm Sally was located near latitude 27.3 North, longitude 84.6 West. Sally is moving toward the west-northwest near 13 mph (20 km/h), and a west-northwestward or northwestward motion is expected through Monday. A decrease in forward speed and a turn toward the north- northwest is forecast on Tuesday. On the forecast track, the center of Sally will move over the southeastern and eastern Gulf of Mexico today, move over the north-central Gulf of Mexico tonight and Monday, and approach the north-central Gulf Coast within the hurricane warning area late Monday and Tuesday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Strengthening is expected over the next couple of days, and Sally is forecast to become a hurricane on Monday, with some additional strengthening possible through early Tuesday. Tropical-storm-force winds extend outward up to 90 miles (150 km) from the center. A buoy located about 25 miles offshore of Venice, Florida, has reported sustained winds of 45 mph and a gust to 58 mph within the past few hours. The latest minimum central pressure based on data from an Air Force Reserve reconnaissance aircraft is 996 mb (29.41 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Sally can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... Mouth of the Mississippi River to Ocean Springs including Lake Borgne...7-11 ft Port Fourchon to Mouth of the Mississippi River...4-7 ft Ocean Springs to MS/AL Border...4-7 ft Lake Pontchartrain and Lake Maurepas...4-6 ft MS/AL Border to AL/FL Border including Mobile Bay...2-4 ft AL/FL Border to Chassahowitzka including Pensacola Bay, Choctawhatchee Bay, and Saint Andrew Bay...1-3 ft The deepest water will occur along the immediate coast near and to the right of the landfall location, where the surge will be accompanied by large and damaging waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Hurricane conditions are expected within the warning area starting late Monday, with hurricane conditions possible within the hurricane watch area by early Tuesday. Tropical storm conditions are possible within the watch area by Monday, and within the warning area late Monday. RAINFALL: Tropical Storm Sally is expected to produce additional rainfall amounts of 1 to 3 inches with isolated amounts of 6 inches across southern and central Florida through Monday. This rainfall will produce flash and urban flooding and prolong high flows and ongoing minor flooding on rivers across Central Florida. Tropical Storm Sally is expected to produce rainfall amounts of 6 to 12 inches with isolated amounts of 20 inches over portions of the Central Gulf Coast between the western Florida Panhandle and far southeast Louisiana from Monday into the middle of the week. Rainfall of 4 to 8 inches is possible farther inland over portions of Mississippi and Alabama. Sally is expected to be a slow moving system resulting in significant flash flooding near the Central Gulf Coast through the middle of the week. Flash, urban and rapid onset flooding along small streams, and minor to isolated major flooding on rivers is likely. SURF: Swells will spread northward along the west-central coast of Florida and reach the Florida Panhandle and the northern Gulf Coast during the next couple of days. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 AM EDT. $$ Forecaster Brown
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Tropical Storm Sally Potential Storm Surge Flooding Map
2020-09-13 12:10:17| National Hurricane Center (Atlantic)
Potential Storm Surge Flooding Map last updated Sun, 13 Sep 2020 10:10:17 GMT
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Tropical Storm Sally Probabilistic Storm Surge Graphics
2020-09-13 11:52:14| National Hurricane Center (Atlantic)
Probabilistic Storm Surge Graphics last updated Sun, 13 Sep 2020 09:52:14 GMT
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Tropical Storm Sally Forecast Discussion Number 7
2020-09-13 11:42:02| National Hurricane Center (Atlantic)
Issued at 500 AM EDT Sun Sep 13 2020 000 WTNT44 KNHC 130941 CCA TCDAT4 Tropical Storm Sally Discussion Number 7...Corrected NWS National Hurricane Center Miami FL AL192020 500 AM EDT Sun Sep 13 2020 Corrected for inland status at 60 and 72 hourrs A large burst of convection has formed near the center of Sally this morning, and Air Force Reserve Hurricane Hunter data indicate that the storm is strengthening. Peak flight-level winds were up to 57 kt at 925 mb, with believable SFMR winds of up to 45 kt, and pressure falling a couple of mb to 1001. The initial wind speed is set to 45 kt for this advisory. While northwesterly shear has been affecting Sally, the global models suggest that the shear will decrease later today as it moves under a narrow ridge. Models all respond to these changing conditions by showing intensification, but they disagree on the rate of change. It is an extremely tricky forecast because of how this might happen close to landfall, but guidance is generally 5-10 kt higher than the last cycle so the intensity forecast has been raised by those amounts up through landfall. It is worth noting that rapid intensification is a possibility if the system develops a more solid inner core on Monday, and stronger solutions like the HWRF model can't be dismissed. Sally is moving west-northwestward at a faster speed this morning. The biggest change to note is that almost every model has shifted westward (faster) due to narrow ridging developing across the northern Gulf Coast between the storm and an exiting mid-latitude trough. The flow gets quite weak near and after landfall, so the cyclone should slow down on Tuesday/Wednesday and turn northward. After that time, the next trough should induce a faster northeastward motion by day 5. The new track is shifted westward between 30-45 n mi near the coast of Louisiana, and is still east of the GFS and ECMWF models. Users are reminded to not focus on the exact details of the track or intensity forecasts, as the average NHC track error at 48 h is around 80-90 miles and the average intensity error is around 10-15 mph. In addition, wind, storm surge, and rainfall hazards will extend far from the center. Unfortunately, confidence is increasing that Sally's expected slow forward speed near the Gulf Coast will exacerbate the storm surge and heavy rainfall threats. KEY MESSAGES: 1. An extremely dangerous and life-threatening storm surge is now expected, and a Storm Surge Warning is in effect for areas outside the southeastern Louisiana Hurricane and Storm Damage Risk Reduction System from Port Fourchon Louisiana to the Mississippi/Alabama border. Residents in these areas should follow any advice given by local officials. 2. Hurricane conditions are expected by early Tuesday from Grand Isle, Louisiana to Ocean Springs, Mississippi, including Metropolitan New Orleans, with tropical storm conditions likely by Monday. Preparations should be rushed to completion in those areas. 3. Tropical Storm Sally is expected to produce flash flooding across southern and central Florida and prolong existing minor river flooding across Central Florida through Monday. Significant flash flooding and minor to isolated major river flooding is likely across portions of the Central Gulf Coast from Monday through the middle of the week. FORECAST POSITIONS AND MAX WINDS INIT 13/0900Z 27.0N 84.0W 45 KT 50 MPH 12H 13/1800Z 27.7N 85.4W 50 KT 60 MPH 24H 14/0600Z 28.3N 87.2W 60 KT 70 MPH 36H 14/1800Z 28.7N 88.7W 70 KT 80 MPH 48H 15/0600Z 29.2N 89.7W 85 KT 100 MPH 60H 15/1800Z 30.1N 90.0W 70 KT 80 MPH...INLAND 72H 16/0600Z 31.0N 90.0W 50 KT 60 MPH...INLAND 96H 17/0600Z 32.8N 88.6W 30 KT 35 MPH...INLAND 120H 18/0600Z 34.5N 84.5W 20 KT 25 MPH...INLAND $$ Forecaster Blake
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