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Tropical Storm Hilda Forecast Discussion Number 15
2021-08-03 11:00:05| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Tue Aug 03 2021 000 WTPZ43 KNHC 030900 TCDEP3 Tropical Storm Hilda Discussion Number 15 NWS National Hurricane Center Miami FL EP082021 200 AM PDT Tue Aug 03 2021 Overnight, Hilda's deep convection has continued to pulse, but primarily in the southern semicircle of the circulation as 15-20 kt of northeasterly vertical wind shear continues displacing this activity downshear. A helpful ASCAT-B pass at 0602 UTC indicated the center of Hilda was located on the northern edge of the convective cirrus canopy, with the instrument also indicating a peak wind retrieval of 53 kt. The most recent microwave imagery concurs with this assessment and also indicates the earlier eyewall is no longer well-defined. While the 0600 UTC subjective Dvorak estimates from TAFB and SAB were both T4.0/65 kt, the most recent objective Dvorak estimate from UW-CIMSS was down to T3.5/55 kt. Given the devolving convective structure seen on microwave, the initial intensity has been reduced to 60 kt, leaning towards the lower intensity estimates. Hilda continues to move slowly northwestward, at 315/7 kt as it remains positioned southwest of a mid-level ridge centered over southern California. Over the next several days, this ridge is forecast to build westward over the East Pacific as a short-wave trough offshore of California lifts out. This synoptic pattern should allow Hilda to gradually bend to the west-northwest and increase its forward motion slightly over the forecast period. Hilda will also become increasingly influenced by low-level ridging, steering the cyclone more westward as it becomes a weak and shallow cyclone. The latest NHC track forecast is just a touch south of the previous forecast track, blending the reliable TVCE and HCCA consensus aids. Northeasterly vertical wind shear, related to the remaining convective outflow of Ignacio, is expected to keep Hilda on a weakening trend over the next day or so. Even though this shear is expected to subside thereafter, Hilda will also be crossing the 25 degree Celsius sea-surface temperature isotherm in 24 hours. Thus, continued weakening is expected. The latest NHC intensity forecast follows the HCCA consensus aid closely, showing weakening throughout the forecast period. The tropical cyclone is now expected to degenerate to a remnant low by Friday, when model guidance suggests organized deep-convection will cease. The remnant low is then expected to open up into a trough by the weekend, well east of Hawaii. FORECAST POSITIONS AND MAX WINDS INIT 03/0900Z 17.0N 123.9W 60 KT 70 MPH 12H 03/1800Z 17.6N 124.6W 50 KT 60 MPH 24H 04/0600Z 18.6N 125.5W 45 KT 50 MPH 36H 04/1800Z 19.4N 126.7W 40 KT 45 MPH 48H 05/0600Z 20.2N 128.1W 35 KT 40 MPH 60H 05/1800Z 21.0N 129.9W 30 KT 35 MPH 72H 06/0600Z 21.7N 132.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 07/0600Z 22.4N 136.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 08/0600Z...DISSIPATED $$ Forecaster Papin/Brown
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Tropical Storm Hilda Public Advisory Number 15
2021-08-03 10:57:36| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Tue Aug 03 2021 413 WTPZ33 KNHC 030857 TCPEP3 BULLETIN Tropical Storm Hilda Advisory Number 15 NWS National Hurricane Center Miami FL EP082021 200 AM PDT Tue Aug 03 2021 ...HILDA WEAKENS TO A TROPICAL STORM... SUMMARY OF 200 AM PDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...17.0N 123.9W ABOUT 995 MI...1600 KM WSW OF THE SOUTHERN TIP OF BAJA CALIFORNIA MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NW OR 315 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...992 MB...29.30 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 200 AM PDT (0900 UTC), the center of Tropical Storm Hilda was located near latitude 17.0 North, longitude 123.9 West. Hilda is moving toward the northwest near 8 mph (13 km/h). This general motion is forecast to continue for the next day or so with a gradual turn to the west-northwest expected by Thursday. Maximum sustained winds have decreased to near 70 mph (110 km/h) with higher gusts. Additional weakening is forecast over the next several days, and Hilda is forecast to weaken into a tropical depression on Thursday. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center. The estimated minimum central pressure is 992 mb (29.30 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 800 AM PDT. $$ Forecaster Papin/Brown
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Tropical Storm Hilda Wind Speed Probabilities Number 15
2021-08-03 10:57:35| National Hurricane Center (East Pacific)
Issued at 0900 UTC TUE AUG 03 2021 000 FOPZ13 KNHC 030857 PWSEP3 TROPICAL STORM HILDA WIND SPEED PROBABILITIES NUMBER 15 NWS NATIONAL HURRICANE CENTER MIAMI FL EP082021 0900 UTC TUE AUG 03 2021 AT 0900Z THE CENTER OF TROPICAL STORM HILDA WAS LOCATED NEAR LATITUDE 17.0 NORTH...LONGITUDE 123.9 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 60 KTS...70 MPH...110 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 06Z 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 06Z TUE 18Z TUE 06Z WED 18Z WED 06Z THU 06Z FRI 06Z SAT PERIODS TO TO TO TO TO TO TO 18Z TUE 06Z WED 18Z WED 06Z THU 06Z FRI 06Z SAT 06Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT 15N 125W 34 2 1( 3) X( 3) X( 3) X( 3) X( 3) X( 3) 20N 125W 34 2 9(11) 5(16) 1(17) X(17) X(17) X(17) 20N 130W 34 X X( X) 1( 1) 3( 4) 7(11) 1(12) X(12) $$ FORECASTER PAPIN/BROWN
Tropical Storm Hilda Forecast Advisory Number 15
2021-08-03 10:56:35| National Hurricane Center (East Pacific)
Issued at 0900 UTC TUE AUG 03 2021 433 WTPZ23 KNHC 030856 TCMEP3 TROPICAL STORM HILDA FORECAST/ADVISORY NUMBER 15 NWS NATIONAL HURRICANE CENTER MIAMI FL EP082021 0900 UTC TUE AUG 03 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 17.0N 123.9W AT 03/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 315 DEGREES AT 7 KT ESTIMATED MINIMUM CENTRAL PRESSURE 992 MB MAX SUSTAINED WINDS 60 KT WITH GUSTS TO 75 KT. 50 KT....... 30NE 30SE 20SW 30NW. 34 KT....... 60NE 70SE 50SW 60NW. 12 FT SEAS..120NE 150SE 120SW 120NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 17.0N 123.9W AT 03/0900Z AT 03/0600Z CENTER WAS LOCATED NEAR 16.8N 123.7W FORECAST VALID 03/1800Z 17.6N 124.6W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 30SE 0SW 30NW. 34 KT... 60NE 70SE 50SW 50NW. FORECAST VALID 04/0600Z 18.6N 125.5W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 60NE 60SE 40SW 50NW. FORECAST VALID 04/1800Z 19.4N 126.7W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 50NE 50SE 30SW 40NW. FORECAST VALID 05/0600Z 20.2N 128.1W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 40NE 40SE 0SW 40NW. FORECAST VALID 05/1800Z 21.0N 129.9W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 06/0600Z 21.7N 132.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 125 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 07/0600Z 22.4N 136.2W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. OUTLOOK VALID 08/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 17.0N 123.9W NEXT ADVISORY AT 03/1500Z $$ FORECASTER PAPIN/BROWN
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Tropical Depression Ignacio Forecast Discussion Number 7
2021-08-03 10:47:42| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Tue Aug 03 2021 000 WTPZ45 KNHC 030847 TCDEP5 Tropical Depression Ignacio Discussion Number 7 NWS National Hurricane Center Miami FL EP102021 200 AM PDT Tue Aug 03 2021 Strong east-northeasterly shear has continued to take a toll on Ignacio overnight with a small cluster of remaining deep convection now displaced over 60 n mi to the southwest of the center. An ASCAT overpass that arrived shortly after the release of the previous advisory indicates that Ignacio has weakened to a tropical depression with peak winds of around 30 kt. That is also supported by a blend of the latest Dvorak T- and CI-numbers from TAFB and SAB. The strong shear and marginal SSTs should continue to cause gradual weakening over the next 12-24 hours, and Ignacio is expected to become a remnant low Tuesday night. The GFS, ECMWF, and UKMET all show the remnant low opening up into a trough of low pressure shortly thereafter, and so does the official forecast. Ignacio is moving slower toward the northwest than before, or about 315/5 kt. A further reduction in forward speed is predicted over the next 12-24 hours as Ignacio weakens and is steered by the weaker low-level flow. The track guidance again suggests that the remnant low will turn northeastward before dissipating, and the updated NHC track forecast has been adjusted accordingly. FORECAST POSITIONS AND MAX WINDS INIT 03/0900Z 20.1N 116.3W 30 KT 35 MPH 12H 03/1800Z 20.9N 116.9W 25 KT 30 MPH 24H 04/0600Z 21.2N 116.6W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 04/1800Z...DISSIPATED $$ Forecaster Brown
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