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Tropical Depression Norbert Forecast Discussion Number 10
2020-10-08 04:40:34| National Hurricane Center (East Pacific)
Issued at 900 PM MDT Wed Oct 07 2020 000 WTPZ44 KNHC 080240 TCDEP4 Tropical Depression Norbert Discussion Number 10 NWS National Hurricane Center Miami FL EP192020 900 PM MDT Wed Oct 07 2020 Tropical Depression Norbert is still struggling to maintain any deep convection near its center. Satellite imagery indicates the low-level center remains exposed, and a small convective burst noted in recent infrared imagery is already collapsing. The initial intensity is perhaps generously held at 30 kt based on a blend of recent objective satellite estimates and Dvorak classifications from TAFB and SAB. Overnight scatterometer data should help further assess whether additional weakening has occurred. Norbert continues to meander within a weak steering pattern, and its center has drifted southeast of the previous advisory position. Little movement is expected during the next 12 h, but Norbert should begin slowly moving west-southwestward from 12-36 h. Then, the cyclone should move west-northwestward or northwestward at around 5 kt for the remainder of the forecast period as a mid-level ridge builds to the north and northeast of Norbert. No significant changes were made to the NHC track forecast with this advisory. Although current satellite trends do not bode well for Norbert, the system remains embedded in a favorable environment of warm water and light vertical wind shear. The latest SHIPS guidance suggests the deep-layer shear will increase slightly during the next 24 h, which combined with any more dry air intrusions could cause Norbert to degenerate into a remnant low. On the other hand, increasing mid-level moisture and weaker shear beyond this time period could allow for a convective burst capable of getting Norbert back to minimal tropical storm strength. Given the mixed signals for small intensity fluctuations in either direction, the official intensity forecast holds Norbert's intensity steady for the next several days. FORECAST POSITIONS AND MAX WINDS INIT 08/0300Z 13.2N 106.8W 30 KT 35 MPH 12H 08/1200Z 13.2N 106.8W 30 KT 35 MPH 24H 09/0000Z 13.1N 107.1W 30 KT 35 MPH 36H 09/1200Z 13.0N 107.6W 30 KT 35 MPH 48H 10/0000Z 13.2N 108.4W 30 KT 35 MPH 60H 10/1200Z 13.9N 109.1W 30 KT 35 MPH 72H 11/0000Z 14.9N 109.7W 30 KT 35 MPH 96H 12/0000Z 16.5N 110.5W 30 KT 35 MPH 120H 13/0000Z 17.0N 111.5W 25 KT 30 MPH $$ Forecaster Reinhart/Berg
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Tropical Depression Norbert Wind Speed Probabilities Number 10
2020-10-08 04:37:58| National Hurricane Center (East Pacific)
Issued at 0300 UTC THU OCT 08 2020 000 FOPZ14 KNHC 080237 PWSEP4 TROPICAL DEPRESSION NORBERT WIND SPEED PROBABILITIES NUMBER 10 NWS NATIONAL HURRICANE CENTER MIAMI FL EP192020 0300 UTC THU OCT 08 2020 AT 0300Z THE CENTER OF TROPICAL DEPRESSION NORBERT WAS LOCATED NEAR LATITUDE 13.2 NORTH...LONGITUDE 106.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) PACIFIC DAYLIGHT TIME (PDT)...SUBTRACT 7 HOURS FROM Z TIME HAWAIIAN STANDARD TIME (HST)...SUBTRACT 10 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 00Z THU 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 00Z THU 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON PERIODS TO TO TO TO TO TO TO 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON 00Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT 15N 105W 34 X 1( 1) 1( 2) X( 2) 1( 3) X( 3) X( 3) CLIPPERTON IS 34 X X( X) 1( 1) 1( 2) 1( 3) X( 3) 1( 4) 10N 110W 34 X X( X) 1( 1) X( 1) 1( 2) X( 2) 1( 3) 15N 110W 34 X 1( 1) X( 1) 2( 3) 11(14) 3(17) 1(18) 15N 110W 50 X X( X) X( X) X( X) 3( 3) X( 3) X( 3) ISLA SOCORRO 34 X X( X) X( X) X( X) 1( 1) 2( 3) 2( 5) $$ FORECASTER REINHART/BERG
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Tropical Depression Norbert Public Advisory Number 10
2020-10-08 04:37:28| National Hurricane Center (East Pacific)
Issued at 900 PM MDT Wed Oct 07 2020 000 WTPZ34 KNHC 080237 TCPEP4 BULLETIN Tropical Depression Norbert Advisory Number 10 NWS National Hurricane Center Miami FL EP192020 900 PM MDT Wed Oct 07 2020 ...TROPICAL DEPRESSION NORBERT CONTINUES TO STRUGGLE WITH DRY AIR... SUMMARY OF 900 PM MDT...0300 UTC...INFORMATION ---------------------------------------------- LOCATION...13.2N 106.8W ABOUT 435 MI...700 KM SSW OF MANZANILLO MEXICO MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...S OR 170 DEGREES AT 1 MPH...2 KM/H MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 900 PM MDT (0300 UTC), the center of Tropical Depression Norbert was located near latitude 13.2 North, longitude 106.8 West. The depression is moving toward the south near 1 mph (2 km/h). Little motion is expected tonight, with a southwestward drift expected on Thursday. A slow motion toward the west-northwest or northwest is expected Friday and Saturday. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Little change in strength is forecast during the next few days. The estimated minimum central pressure is 1007 mb (29.74 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 300 AM MDT. $$ Forecaster Reinhart/Berg
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Tropical Depression Norbert Forecast Advisory Number 10
2020-10-08 04:36:27| National Hurricane Center (East Pacific)
Issued at 0300 UTC THU OCT 08 2020 000 WTPZ24 KNHC 080236 TCMEP4 TROPICAL DEPRESSION NORBERT FORECAST/ADVISORY NUMBER 10 NWS NATIONAL HURRICANE CENTER MIAMI FL EP192020 0300 UTC THU OCT 08 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 13.2N 106.8W AT 08/0300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE SOUTH OR 170 DEGREES AT 1 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1007 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 12 FT SEAS.. 75NE 0SE 0SW 60NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 13.2N 106.8W AT 08/0300Z AT 08/0000Z CENTER WAS LOCATED NEAR 13.3N 106.9W FORECAST VALID 08/1200Z 13.2N 106.8W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 09/0000Z 13.1N 107.1W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 09/1200Z 13.0N 107.6W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 10/0000Z 13.2N 108.4W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 10/1200Z 13.9N 109.1W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 11/0000Z 14.9N 109.7W MAX WIND 30 KT...GUSTS 40 KT. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 150 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 12/0000Z 16.5N 110.5W MAX WIND 30 KT...GUSTS 40 KT. OUTLOOK VALID 13/0000Z 17.0N 111.5W MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.2N 106.8W NEXT ADVISORY AT 08/0900Z $$ FORECASTER REINHART/BERG
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Hurricane Delta Public Advisory Number 13A
2020-10-08 01:59:56| National Hurricane Center (Atlantic)
Issued at 700 PM CDT Wed Oct 07 2020 000 WTNT31 KNHC 072359 TCPAT1 BULLETIN Hurricane Delta Intermediate Advisory Number 13A NWS National Hurricane Center Miami FL AL262020 700 PM CDT Wed Oct 07 2020 ...DELTA STRENGTHENING WHILE MOVING OVER THE SOUTH-CENTRAL GULF OF MEXICO... ...LIFE-THREATENING STORM SURGE AND DAMAGING WINDS INCREASINGLY LIKELY ALONG PORTIONS OF THE NORTHERN GULF COAST BEGINNING FRIDAY... SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...22.3N 90.2W ABOUT 550 MI...890 KM SSE OF CAMERON LOUISIANA MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H PRESENT MOVEMENT...NW OR 305 DEGREES AT 17 MPH...28 KM/H MINIMUM CENTRAL PRESSURE...973 MB...28.73 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Mexico has changed the Hurricane Warning from Rio Lagartos to Dzilam, Mexico to a Tropical Storm Warning, and discontinued all warnings for the remainder of the Yucatan Peninsula. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Watch is in effect for... * High Island Texas to the Alabama/Florida border including Calcasieu Lake, Vermilion Bay, Lake Pontchartrain, Lake Maurepas, Lake Borgne and Mobile Bay A Hurricane Watch is in effect for... * High Island Texas to Grand Isle Louisiana A Tropical Storm Warning is in effect for... * Rio Lagartos to Dzilam Mexico A Tropical Storm Watch is in effect for... * San Luis Pass to west of High Island Texas * East of Grand Isle Louisiana to Bay St. Louis Mississippi, including New Orleans * Lake Pontchartrain and Lake Maurepas 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 Warning means that tropical storm conditions are expected somewhere within the warning area. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 700 PM CDT (0000 UTC), the center of Hurricane Delta was located by an Air Force Hurricane Hunter aircraft near latitude 22.3 North, longitude 90.2 West. Delta is moving toward the northwest near 17 mph (28 km/h). A northwestward motion with a reduction in forward speed is expected through early Thursday. A north-northwestward motion is expected by late Thursday, and a faster northward to north-northeastward motion is forecast on Friday and Friday night. On the forecast track, the center of Delta will move over the southern and central Gulf of Mexico through Thursday, and approach the northern Gulf coast within the hurricane watch area on Friday. Delta is forecast to move inland within the hurricane watch area by late Friday or Friday night. Maximum sustained winds have increased to near 90 mph (150 km/h) with higher gusts. Further strengthening is forecast while the hurricane moves over the southern and central Gulf of Mexico through Thursday, and Delta is expected to become a major hurricane again. Some weakening is forecast as Delta approaches the northern Gulf coast on Friday. Hurricane-force winds extend outward up to 35 miles (55 km) from the center and tropical-storm-force winds extend outward up to 125 miles (205 km). During the past few hours, a Mexican weather station on Isla Perez, off the north coast of the Yucatan Peninsula, measured a sustained wind of 65 mph (105 km/h) and a gust to 90 mph (145 km/h). The estimated minimum central pressure is 973 mb (28.73 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Delta can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT1, WMO header WTNT41 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT1.shtml. 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... Pecan Island, LA to Port Fourchon, LA including Vermilion Bay...7-11 ft Cameron, LA to Pecan Island, LA...4-7 ft Port Fourchon, LA to Ocean Springs, MS including Lake Borgne...4-6 ft Lake Pontchartrain and Lake Maurepas...3-5 ft Ocean Springs, MS to AL/FL border including Mobile Bay...2-4 ft High Island, TX to Cameron, LA including Calcasieu Lake...2-4 ft Sabine Lake...1-3 ft Port O'Connor, TX to High Island, TX including Galveston Bay...1-3 ft The deepest water will occur along the immediate coast near and to the east of the landfall location, 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 possible within the watch areas along the Gulf coast by late Thursday night or early Friday with hurricane conditions possible within the hurricane watch area by Friday. RAINFALL: Through early Thursday, Delta is expected to produce 4 to 6 inches of rain, with isolated maximum totals of 10 inches, across portions of the northern Yucatan Peninsula. This rainfall may result in areas of significant flash flooding. Friday through Saturday, Delta is expected to produce 4 to 8 inches of rain, with isolated maximum totals of 12 inches across portions of the central Gulf Coast north into portions of the Lower to Middle Mississippi Valley. These rainfall amounts will lead to flash, urban, small stream and minor to isolated moderate river flooding. As Delta moves farther inland, 1 to 3 inches of rain, with locally higher amounts, is expected in the Ohio Valley and Mid Atlantic this weekend. TORNADOES: The risk of a few tornadoes will increase late Thursday night into Friday over portions of southern Louisiana, southern Mississippi, and southwest Alabama. SURF: Swells from Delta will begin to affect portions of the northern and western Gulf coast on Thursday. 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 1000 PM CDT. $$ Forecaster Pasch
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