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Tropical Storm Nicholas Forecast Discussion Number 10
2021-09-14 16:57:34| National Hurricane Center (Atlantic)
Issued at 1000 AM CDT Tue Sep 14 2021 000 WTNT44 KNHC 141457 TCDAT4 Tropical Storm Nicholas Discussion Number 10 NWS National Hurricane Center Miami FL AL142021 1000 AM CDT Tue Sep 14 2021 Doppler weather radar data from Houston and Lake Charles, along with surface observations, indicate that Nicholas has continued to weaken while moving farther inland. The strongest winds recently reported near the Texas and Louisiana coasts have been 33-35 kt at a TCOON observing station near Sabine Pass, Texas. The strongest winds over water south of southwestern Louisiana are based on Doppler radar average velocities of 45-50 kt between 5000-7500 ft. Based on these wind data, the initial intensity has been lowered to 40 kt. The estimated central pressure of 1002 mb is based on nearby surface observations in the Houston metropolitan area. Further weakening is expected as Nicholas moves farther inland due to frictional effects, entrainment of very dry mid-level air from the southern Plains, and increasing southwesterly to westerly shear. The latter condition is expected to cause the low- and upper-level circulation to decouple in about 24 hours, which will hasten the weakening process. No significant changes were made to the previous intensity forecast, and Nicholas is now expected to become a tropical depression by tonight and degenerate into a remnant low by late Wednesday. Nicholas is now moving northeastward or 050 degrees at a slower forward speed of 5 kt. The cyclone should gradually turn toward the east-northeast by tonight, and move eastward more slowly on Wednesday and Thursday. It is possible that Nicholas could stall over southwestern or central Louisiana as the low-level steering flow collapses. The new NHC track forecast is similar to but slightly slower than the previous advisory tack. Although the winds associated with Nicholas will be weakening, heavy rainfall and a significant flash flood risk will continue along the Gulf Coast during the next couple of days. Key Messages: 1. Heavy rainfall will impact areas from the upper coast of Texas, across Louisiana, southern Mississippi, far southern Alabama and the western Florida Panhandle through Thursday. Significant rainfall amounts are expected, potentially resulting in areas of life-threatening flash and urban flooding across these areas. Minor to isolated major river flooding is also possible in smaller river basins and urban areas. 2. There is the danger of life-threatening storm surge inundation along the coast of Texas from Port Bolivar to Sabine Pass. Residents in these areas should follow any advice given by local officials. 3. Tropical storm conditions are expected to continue along the Louisiana coast into this afternoon. Tropical storm conditions in the warning area across the upper Texas coast will diminish this afternoon as Nicholas moves farther to the northeast. FORECAST POSITIONS AND MAX WINDS INIT 14/1500Z 29.6N 95.3W 40 KT 45 MPH...INLAND 12H 15/0000Z 30.1N 94.7W 30 KT 35 MPH...INLAND 24H 15/1200Z 30.4N 93.9W 25 KT 30 MPH...INLAND 36H 16/0000Z 30.4N 93.2W 25 KT 30 MPH...INLAND 48H 16/1200Z 30.5N 92.8W 15 KT 15 MPH...INLAND 60H 17/0000Z 30.9N 92.8W 15 KT 15 MPH...POST-TROP/REMNT LOW 72H 17/1200Z...DISSIPATED $$ Forecaster Stewart
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Tropical Storm Nicholas Storm Surge Watch/Warning Map
2021-09-14 16:54:37| National Hurricane Center (Atlantic)
Storm Surge Watch/Warning Map last updated Tue, 14 Sep 2021 14:54:37 GMT
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Summary for Tropical Storm Nicholas (AT4/AL142021)
2021-09-14 16:52:35| National Hurricane Center (Atlantic)
...NICHOLAS MOVING SLOWLY ACROSS THE HOUSTON METROPOLITAN AREA... ...LIFE-THREATENING FLASH FLOODS EXPECTED ACROSS PORTIONS OF THE DEEP SOUTH DURING THE NEXT COUPLE OF DAYS... As of 10:00 AM CDT Tue Sep 14 the center of Nicholas was located near 29.6, -95.3 with movement NE at 6 mph. The minimum central pressure was 1002 mb with maximum sustained winds of about 45 mph.
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Tropical Storm Nicholas Public Advisory Number 10
2021-09-14 16:52:35| National Hurricane Center (Atlantic)
Issued at 1000 AM CDT Tue Sep 14 2021 000 WTNT34 KNHC 141452 TCPAT4 BULLETIN Tropical Storm Nicholas Advisory Number 10 NWS National Hurricane Center Miami FL AL142021 1000 AM CDT Tue Sep 14 2021 ...NICHOLAS MOVING SLOWLY ACROSS THE HOUSTON METROPOLITAN AREA... ...LIFE-THREATENING FLASH FLOODS EXPECTED ACROSS PORTIONS OF THE DEEP SOUTH DURING THE NEXT COUPLE OF DAYS... SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...29.6N 95.3W ABOUT 10 MI...15 KM SE OF HOUSTON TEXAS ABOUT 85 MI...140 KM WSW OF PORT ARTHUR TEXAS MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...NE OR 40 DEGREES AT 6 MPH...9 KM/H MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning has been discontinued west of High Island, Texas. The Storm Surge Warning has been discontinued south of Port Bolivar, Texas. The Storm Surge Watch has been discontinued east of Cameron, Louisiana. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Port Bolivar Texas to Sabine Pass including Galveston Bay A Tropical Storm Warning is in effect for... * High Island Texas to Cameron Louisiana A Storm Surge Watch is in effect for... * Sabine Pass to Cameron Louisiana A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline. 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. A Storm Surge Watch means there is a possibility of life-threatening inundation, from rising water moving inland from the coastline. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. 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 1000 AM CDT (1500 UTC), the center of Tropical Storm Nicholas was located near latitude 29.6 North, longitude 95.3 West. Nicholas is moving toward the northeast near 6 mph (9 km/h) and this general motion should continue today. The storm should move more slowly toward the east-northeast by tonight, and then turn eastward on Wednesday over Louisiana. Little motion is anticipated on Thursday. NOAA Doppler weather radar and surface observations indicate that maximum sustained winds have decreased to near 45 mph (75 km/h) with higher gusts. Additional weakening is forecast during the next couple of days as Nicholas moves farther inland, and the storm is forecast to become a tropical depression by tonight. Tropical-storm-force winds extend outward up to 140 miles (220 km), mainly over water to the southeast of the center. A TCOON observing station at Texas Point, Sabine Pass, Texas, recently measured a 1-minute sustained wind of 40 mph (65 km/h) and a gust to 51 mph (81 km/h). The estimated minimum central pressure is 1002 mb (29.59 inches) based on nearby surface observations. 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 additional rainfall of 5 to 10 inches from the upper Texas coastal area into central to southern Louisiana, far southern Mississippi, far southern Alabama and the western Florida Panhandle through Thursday, with isolated storm totals of 20 inches across southern Louisiana. Life-threatening flash flooding impacts, especially in urbanized metropolitan areas, are possible across these regions. Widespread minor to isolated major river flooding is expected across portions of the upper Texas Gulf Coast and southern Louisiana and Mississippi. For the latest rainfall reports and wind gusts associated with Hurricane Nicholas see the companion storm summary at WBCSCCNS4 with the WMO header ACUS44KWBC or at the following link https://www.wpc.ncep.noaa.gov/discussions/nfdscc4.html 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 Bolivar, TX to Cameron, LA including Galveston Bay...2-4 ft Port Aransas, TX to Port Bolivar, TX...1-3 ft Aransas Bay, San Antonio Bay, and Matagorda Bay...1-3 ft Cameron, LA to Intracoastal City, LA...1-3 ft Sabine Lake and Calcasieu Lake...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, 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 continue along the Louisiana coast into this afternoon. Tropical storm conditions in the warning area across the upper Texas coast will diminish this afternoon as Nicholas moves farther to the northeast. TORNADOES: A tornado or two will be possible today into tonight across southern Louisiana. SURF: Swells generated by Nicholas will continue affecting portions of the northwest Gulf coast today. 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 100 PM CDT. Next complete advisory at 400 PM CDT. $$ Forecaster Stewart
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Tropical Storm Nicholas Wind Speed Probabilities Number 10
2021-09-14 16:52:35| National Hurricane Center (Atlantic)
Issued at 1500 UTC TUE SEP 14 2021 000 FONT14 KNHC 141452 PWSAT4 TROPICAL STORM NICHOLAS WIND SPEED PROBABILITIES NUMBER 10 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142021 1500 UTC TUE SEP 14 2021 AT 1500Z THE CENTER OF TROPICAL STORM NICHOLAS WAS LOCATED NEAR LATITUDE 29.6 NORTH...LONGITUDE 95.3 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 40 KTS...45 MPH...75 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 12Z TUE AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 12Z TUE 00Z WED 12Z WED 00Z THU 12Z THU 12Z FRI 12Z SAT PERIODS TO TO TO TO TO TO TO 00Z WED 12Z WED 00Z THU 12Z THU 12Z FRI 12Z SAT 12Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT BATON ROUGE LA 34 X 1( 1) 2( 3) 1( 4) 1( 5) X( 5) X( 5) MORGAN CITY LA 34 X 1( 1) 2( 3) 1( 4) X( 4) X( 4) X( 4) ALEXANDRIA LA 34 1 1( 2) 3( 5) 1( 6) 1( 7) X( 7) X( 7) LAFAYETTE LA 34 1 2( 3) 4( 7) 1( 8) X( 8) X( 8) X( 8) NEW IBERIA LA 34 X 2( 2) 4( 6) 1( 7) X( 7) X( 7) X( 7) GFMX 280N 930W 34 1 X( 1) 1( 2) 1( 3) X( 3) X( 3) X( 3) SHREVEPORT LA 34 X 1( 1) 1( 2) X( 2) 1( 3) X( 3) X( 3) FORT POLK LA 34 3 5( 8) 3(11) X(11) 1(12) X(12) X(12) LAKE CHARLES 34 7 7(14) 4(18) X(18) X(18) X(18) X(18) LAKE CHARLES 50 X 2( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) CAMERON LA 34 8 6(14) 3(17) X(17) X(17) X(17) X(17) CAMERON LA 50 X 1( 1) 1( 2) 1( 3) X( 3) X( 3) X( 3) JASPER TX 34 9 4(13) 2(15) X(15) 1(16) X(16) X(16) JASPER TX 50 1 1( 2) X( 2) X( 2) 1( 3) X( 3) X( 3) KOUNTZE TX 34 99 X(99) X(99) X(99) X(99) X(99) X(99) KOUNTZE TX 50 1 1( 2) X( 2) X( 2) 1( 3) X( 3) X( 3) PORT ARTHUR TX 34 99 X(99) X(99) X(99) X(99) X(99) X(99) PORT ARTHUR TX 50 1 1( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) GALVESTON TX 34 99 X(99) X(99) X(99) X(99) X(99) X(99) GALVESTON TX 50 99 X(99) X(99) X(99) X(99) X(99) X(99) HOUSTON TX 34 99 X(99) X(99) X(99) X(99) X(99) X(99) HOUSTON TX 50 99 X(99) X(99) X(99) X(99) X(99) X(99) FREEPORT TX 34 99 X(99) X(99) X(99) X(99) X(99) X(99) FREEPORT TX 50 99 X(99) X(99) X(99) X(99) X(99) X(99) HIGH ISLAND TX 34 99 X(99) X(99) X(99) X(99) X(99) X(99) HIGH ISLAND TX 50 99 X(99) X(99) X(99) X(99) X(99) X(99) $$ FORECASTER STEWART
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