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Tropical Storm Nicholas Storm Surge Watch/Warning Map
2021-09-12 23:01:54| National Hurricane Center (Atlantic)
Storm Surge Watch/Warning Map last updated Sun, 12 Sep 2021 21:01:54 GMT
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Tropical Storm Nicholas Forecast Discussion Number 2
2021-09-12 23:01:41| National Hurricane Center (Atlantic)
Issued at 400 PM CDT Sun Sep 12 2021 000 WTNT44 KNHC 122101 TCDAT4 Tropical Storm Nicholas Discussion Number 2 NWS National Hurricane Center Miami FL AL142021 400 PM CDT Sun Sep 12 2021 Visible satellite imagery, scatterometer wind data, and earlier reconnaissance aircraft observations indicate that the circulation of Nicholas is elongated from northwest to southeast. In fact, visible satellite imagery and the aircraft data has shown that there have been several low-level swirls rotating about a mean center. This is not surprising since the tropical cyclone is still in its formative stage. The Air Force plane did not find winds any stronger than they did this morning and the ASCAT data revealed peaks winds of around 30 kt. Given the typical undersampling of the scatterometer instrument, the earlier aircraft data, and peak one-minute wind observations of 31 kt from NOAA buoy 42055 earlier today, the intensity remains 35 kt for this advisory. Nicholas will be moving over the warm waters of the western Gulf of Mexico during the next day or so, and this combined with a moist, unstable atmosphere favors strengthening. The primarily inhibiting factor appears to be moderate south-southwesterly vertical wind shear caused by an upper-level trough over northern Mexico. The trough is forecast to move westward and weaken during the next day or so, which could allow for a more favorable upper-level wind pattern later tonight and Monday. The NHC intensity forecast again calls for strengthening while the system moves toward the northwest Gulf coast, but the main uncertainty regarding the intensity forecast is how much time the cyclone will spend over the Gulf waters. The GFS and HWRF models, which depict a track farther east, show significantly more strengthening than the UKMET and ECMWF models which show a weaker tropical cyclone moving inland over northeastern Mexico or southern Texas much sooner. The NHC intensity forecast is similar to the previous advisory, but indicates a faster rate of strengthening during the next 12-24 hours. Although not explicitly shown in the intensity forecast, Nicholas could approach hurricane strength when it nears the northwest Gulf coast, especially if it moves to the right of the NHC forecast track and spends more time over water. Due to this uncertainty a Hurricane Watch has been issued a for a portion of the Texas coast. The NHC forecast is in best agreement with the SHIPS and HFIP corrected consensus model, but is not as high as the latest HWRF. The center of Nicholas appears to have re-formed farther north since this morning and the initial motion estimate is again a somewhat uncertain 340/12 kt. The track forecast reasoning has not changed from this morning. Nicholas should move north-northwestward to northward during the next day or so around the western portion of a mid-level ridge that is located near the southeast U.S. coast. The latest runs of the various dynamical models have shown typical variability, but the overall guidance envelope has not changed too much through the first 36 hours. The GFS has been the most consistent model and its 12Z run was fairly close to the previous NHC track forecast. Therefore, the NHC track leans along the right side of the guidance envelope between the HWRF and GFS, which are a little to the right of the consensus aids. Due to the acute angle of approach of Nicholas to the coast, users are reminded to not focus on the exact forecast track as small changes in the heading of the cyclone could result in differences in both the location and timing of landfall. Regardless of where Nicholas makes landfall, storm surge, wind, and rainfall impacts are likely over a large portion of northeastern Mexico and Texas coastal areas. After landfall, a slower north-northeastward motion is forecast, and by 72 hours the cyclone is forecast to be located between a couple of mid-level ridges, which will likely result in weaker steering currents and an even slower northeastward motion. By day 5, the global model guidance suggest that the low-level circulation will become an open trough so dissipation is indicated at that time. Key Messages: 1. Periods of heavy rainfall are expected to impact portions of the Texas and Louisiana coasts today through the middle of the week. Significant rainfall amounts are possible, potentially resulting in areas of considerable flash and urban flooding, especially in highly urbanized metropolitan areas. Isolated minor to moderate river flooding is also expected. 2. There is the danger of life-threatening storm surge inundation along the coast of Texas from Port Aransas to San Luis Pass. Residents in these areas should follow any advice given by local officials. 3. Nicholas is forecast to approach the middle Texas coast as a strong tropical storm late Monday and early Tuesday, and could be near hurricane intensity if it moves to the right of the forecast track and remains over water longer. Tropical storm conditions are expected along portions of the middle Texas coast beginning Monday afternoon, with hurricane conditions possible from Port Aransas to Sargent late Monday and Monday night. 4. Tropical storm conditions are expected along portions of the northeastern coast of Mexico and the coast of south Texas beginning Monday morning. FORECAST POSITIONS AND MAX WINDS INIT 12/2100Z 22.8N 95.5W 35 KT 40 MPH 12H 13/0600Z 24.4N 96.3W 45 KT 50 MPH 24H 13/1800Z 26.7N 96.9W 55 KT 65 MPH 36H 14/0600Z 28.7N 96.8W 55 KT 65 MPH...INLAND 48H 14/1800Z 30.4N 96.3W 35 KT 40 MPH...INLAND 60H 15/0600Z 31.2N 95.8W 30 KT 35 MPH...INLAND 72H 15/1800Z 31.7N 95.2W 25 KT 30 MPH...INLAND 96H 16/1800Z 31.9N 94.7W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 17/1800Z...DISSIPATED $$ Forecaster Brown
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Tropical Storm Nicholas Graphics
2021-09-12 23:00:12| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Sun, 12 Sep 2021 21:00:12 GMT Wind Speed Probabilities last updated Sun, 12 Sep 2021 21:22:49 GMT
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Summary for Tropical Storm Nicholas (AT4/AL142021)
2021-09-12 22:59:41| National Hurricane Center (Atlantic)
...NICHOLAS EXPECTED TO STRENGTHEN AS IT MOVES TOWARD THE NORTHWEST GULF COAST... ...STORM SURGE WARNING AND HURRICANE WATCH ISSUED FOR A PORTION OF THE TEXAS COAST... As of 4:00 PM CDT Sun Sep 12 the center of Nicholas was located near 22.8, -95.5 with movement NNW at 14 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 40 mph.
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Tropical Storm Nicholas Public Advisory Number 2
2021-09-12 22:59:41| National Hurricane Center (Atlantic)
Issued at 400 PM CDT Sun Sep 12 2021 000 WTNT34 KNHC 122059 TCPAT4 BULLETIN Tropical Storm Nicholas Advisory Number 2 NWS National Hurricane Center Miami FL AL142021 400 PM CDT Sun Sep 12 2021 ...NICHOLAS EXPECTED TO STRENGTHEN AS IT MOVES TOWARD THE NORTHWEST GULF COAST... ...STORM SURGE WARNING AND HURRICANE WATCH ISSUED FOR A PORTION OF THE TEXAS COAST... SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...22.8N 95.5W ABOUT 160 MI...260 KM ESE OF LA PESCA MEXICO ABOUT 240 MI...385 KM SSE OF MOUTH OF THE RIO GRANDE MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NNW OR 340 DEGREES AT 14 MPH...22 KM/H MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning has been extended eastward to Freeport, Texas. A Storm Surge Warning has been issued for the coast of Texas from Port Aransas to San Luis Pass, including Aransas Bay, San Antonio Bay, and Matagorda Bay. A Hurricane Watch has been issued for the coast of Texas from Port Aransas to Sargent. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Port Aransas to San Luis Pass Texas * Aransas Bay, San Antonio Bay, and Matagorda Bay A Hurricane Watch is in effect for... * Port Aransas to Sargent Texas A Tropical Storm Warning is in effect for... * Mouth of the Rio Grande to Freeport Texas * Barra el Mezquital to the U.S./Mexico border A Storm Surge Watch is in effect for... * Mouth of the Rio Grande to High Island Texas A Tropical Storm Watch is in effect for... * North of Port Aransas to High Island Texas 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 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 watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests elsewhere along the upper Texas coast should monitor the progress of this system. For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside of the United States, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 400 PM CDT (2100 UTC), the center of Tropical Storm Nicholas was located near latitude 22.8 North, longitude 95.5 West. Nicholas is moving toward the north-northwest near 14 mph (22 km/h), and this general motion is expected through tonight. A slower northward or north-northeastward motion is forecast by late Monday or Monday night. On the forecast track, the center of Nicholas will pass near or just offshore the coasts of northeastern Mexico and South Texas on Monday, and move onshore along the coast of south or central Texas coast Monday night or early Tuesday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Strengthening is forecast until Nicholas reaches the northwest Gulf coast Monday night or early Tuesday. Tropical-storm-force winds extend outward up to 105 miles (165 km) from the center. The estimated minimum central pressure is 1008 mb (29.77 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Nicholas can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC and on the web at hurricanes.gov/graphics_at4.shtml?key_messages RAINFALL: Nicholas is expected to produce storm total rainfall of 8 to 16 inches, with isolated maximum amounts of 20 inches, across portions of the middle and upper Texas coastal areas today through the middle of the week. Across the rest of coastal Texas into southwest Louisiana rainfall of 5 to 10 inches is expected. This rainfall may produce areas of considerable flash and urban flooding, especially in highly urbanized metropolitan areas. Additionally, there is the potential for isolated minor to moderate river flooding. Over the northeastern portions of the Mexican state of Tamaulipas rainfall amounts of 2 to 5 inches can be expected today into Monday. 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... Port O'Connor to San Luis Pass TX including Matagorda Bay...3-5 ft Mouth of the Rio Grande to Port O'Connor, TX...2-4 ft San Luis Pass to High Island, TX including Galveston Bay...2-4ft Baffin Bay, Corpus Christi Bay, Aransas Bay and San Antonio Bay...2-4 ft High Island, TX to Intracoastal City including Sabine Lake and Calcasieu Lake..1-3 ft The deepest water will occur along the immediate coast in areas of onshore flow, where the surge will be accompanied by large and dangerous 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: Tropical storm conditions are expected to first reach the coast within the warning area in northeastern Mexico and southern Texas Monday morning, making outside preparations difficult or dangerous. These conditions will spread northward within the warning area through Monday night. Hurricane conditions are possible in the Hurricane Watch area Monday night. Tropical storm conditions are possible within the watch area by late Monday night or early Tuesday. TORNADOES: A tornado or two will be possible Monday into Monday night across the middle and lower Texas coast. SURF: Swells generated by Nicholas will begin affecting portions of the northwest Gulf coast later tonight and continue into Tuesday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 700 PM CDT. Next complete advisory at 1000 PM CDT. $$ Forecaster Brown
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