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Tropical Storm Hilda Forecast Discussion Number 23

2021-08-05 10:41:36| National Hurricane Center (East Pacific)

Issued at 200 AM PDT Thu Aug 05 2021 000 WTPZ43 KNHC 050841 TCDEP3 Tropical Storm Hilda Discussion Number 23 NWS National Hurricane Center Miami FL EP082021 200 AM PDT Thu Aug 05 2021 Hilda is maintaining a small, but shrinking area of deep convection, which has rotated from the southeast to northern portion of the storm's circulation. A 0405 UTC ASCAT-A and 0522 UTC ASCAT-B pass had peak wind retrievals of 36 and 40 kt respectively, about 40 n mi northeast of Hilda's center. This scatterometer data suggests that the storm might have been stronger than estimated yesterday when the convection was more robust. However, given the warming cloud tops and shrinking area of convection since that time, the initial advisory intensity was kept at 35 kt, which still agrees with the most recent subjective Dvorak estimate from TAFB. Hilda is moving to the west-northwest at 8 kt as the tropical cyclone remains steered by a large subtropical ridge over the eastern North Pacific. As the storm becomes more shallow, its general motion should bend westward and gradually accelerate due to the influence of a large low-level ridge centered well northward. The latest track guidance is slightly more poleward early on, and the NHC track forecast was nudged a bit further north, but remains a bit south of the HFIP corrected consensus approach (HCCA). As noted previously, the GFS model forecast remains a northern outlier, with more interaction between Hilda and recently upgraded Jimena, and its solution is not favored at this time. As Hilda continues to move over increasingly cool ocean waters and into a drier and more stable environment, the remaining deep convection will likely dissipate at some point later today. Additional convective bursts thereafter will become increasingly unlikely. The latest NHC forecast expects Hilda to weaken to a tropical depression later today and become a remnant low by tomorrow. This solution is favored by most of the intensity guidance. The remnant low is then forecast to open up into a trough by the weekend, well east of the Hawaiian Islands. FORECAST POSITIONS AND MAX WINDS INIT 05/0900Z 20.1N 129.2W 35 KT 40 MPH 12H 05/1800Z 20.9N 130.7W 30 KT 35 MPH 24H 06/0600Z 21.9N 132.9W 30 KT 35 MPH 36H 06/1800Z 22.6N 135.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 07/0600Z 23.2N 137.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 07/1800Z...DISSIPATED $$ Forecaster Papin/Beven

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Tropical Storm Hilda Wind Speed Probabilities Number 23

2021-08-05 10:40:14| National Hurricane Center (East Pacific)

Issued at 0900 UTC THU AUG 05 2021 000 FOPZ13 KNHC 050838 PWSEP3 TROPICAL STORM HILDA WIND SPEED PROBABILITIES NUMBER 23 NWS NATIONAL HURRICANE CENTER MIAMI FL EP082021 0900 UTC THU AUG 05 2021 AT 0900Z THE CENTER OF TROPICAL STORM HILDA WAS LOCATED NEAR LATITUDE 20.1 NORTH...LONGITUDE 129.2 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 35 KTS...40 MPH...65 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 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 06Z THU 18Z THU 06Z FRI 18Z FRI 06Z SAT 06Z SUN 06Z MON PERIODS TO TO TO TO TO TO TO 18Z THU 06Z FRI 18Z FRI 06Z SAT 06Z SUN 06Z MON 06Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT 20N 130W 34 10 X(10) X(10) X(10) X(10) X(10) X(10) $$ FORECASTER PAPIN/BEVEN

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Summary for Tropical Storm Hilda (EP3/EP082021)

2021-08-05 10:38:25| National Hurricane Center (East Pacific)

...HILDA STILL A TROPICAL STORM... As of 2:00 AM PDT Thu Aug 5 the center of Hilda was located near 20.1, -129.2 with movement WNW at 9 mph. The minimum central pressure was 1005 mb with maximum sustained winds of about 40 mph.

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Tropical Storm Hilda Public Advisory Number 23

2021-08-05 10:38:25| National Hurricane Center (East Pacific)

Issued at 200 AM PDT Thu Aug 05 2021 000 WTPZ33 KNHC 050838 TCPEP3 BULLETIN Tropical Storm Hilda Advisory Number 23 NWS National Hurricane Center Miami FL EP082021 200 AM PDT Thu Aug 05 2021 ...HILDA STILL A TROPICAL STORM... SUMMARY OF 200 AM PDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...20.1N 129.2W ABOUT 1255 MI...2020 KM W OF THE SOUTHERN TIP OF BAJA CALIFORNIA MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...WNW OR 300 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...1005 MB...29.68 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 20.1 North, longitude 129.2 West. Hilda is moving toward the west-northwest near 9 mph (15 km/h) and this motion with a slight increase in forward speed is expected over the next couple of days. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Weakening is expected during the next couple of days, and Hilda is forecast to become a tropical depression later today and degenerate into a remnant low on Friday. Tropical-storm-force winds extend outward up to 60 miles (95 km) from the center. The estimated minimum central pressure is 1005 mb (29.68 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 800 AM PDT. $$ Forecaster Papin/Beven

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Tropical Storm Hilda Forecast Advisory Number 23

2021-08-05 10:37:58| National Hurricane Center (East Pacific)

Issued at 0900 UTC THU AUG 05 2021 000 WTPZ23 KNHC 050837 TCMEP3 TROPICAL STORM HILDA FORECAST/ADVISORY NUMBER 23 NWS NATIONAL HURRICANE CENTER MIAMI FL EP082021 0900 UTC THU AUG 05 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 20.1N 129.2W AT 05/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 300 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 50NE 40SE 0SW 0NW. 12 FT SEAS.. 30NE 30SE 0SW 30NW. 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 20.1N 129.2W AT 05/0900Z AT 05/0600Z CENTER WAS LOCATED NEAR 19.9N 128.8W FORECAST VALID 05/1800Z 20.9N 130.7W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 06/0600Z 21.9N 132.9W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 06/1800Z 22.6N 135.1W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 07/0600Z 23.2N 137.3W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 07/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 20.1N 129.2W NEXT ADVISORY AT 05/1500Z $$ FORECASTER PAPIN/BEVEN

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