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Tropical Storm Karina Forecast Discussion Number 12
2020-09-15 22:59:29| National Hurricane Center (East Pacific)
Issued at 200 PM PDT Tue Sep 15 2020 000 WTPZ41 KNHC 152059 TCDEP1 Tropical Storm Karina Discussion Number 12 NWS National Hurricane Center Miami FL EP162020 Issued by NWS Central Pacific Hurricane Center Honolulu HI 200 PM PDT Tue Sep 15 2020 Latest satellite images show little significant change in the organization of deep convection associated with Karina since the previous advisory. Although the thunderstorms are primarily limited to the southwest semicircle, they remain over the center, and outflow in the northeast semicircle appears somewhat improved in the last couple of hours. A blend of subjective Dvorak current intensity estimates of 3.0/45 kt from SAB/HFO and 3.5/55 kt from TAFB supports maintaining an initial intensity of 50 kt. Karina is crossing the 26C isotherm with an initial motion estimate of 305/10 kt, and much cooler waters lie along the forecast track. Karina is being steered by a mid- and upper-level ridge to the centered to the northeast and north respectively, and the short term forecast anticipates some relaxation of the recent northeasterly shear as Karina rounds the ridges. This should lead to slow weakening in the short term, and as south to southwesterly shear increases after about 24 hours, Karina will continue to weaken. Simulated satellite imagery based on HWRF guidance indicates the cyclone will become convection-free within about 48 hours, with dissipation following soon thereafter. As Karina weakens and becomes increasingly shallow, it will be steered by the low-level northeasterly trade wind flow supplied by a surface high centered to the distant northwest. The updated track forecast lies along the same trajectory as the previous, but is shifted slightly southward due to recent observed motion, and is near the middle of guidance envelope. The intensity forecast is essentially unchanged and closely follows trends presented by SHIPS and FSSE. FORECAST POSITIONS AND MAX WINDS INIT 15/2100Z 20.7N 122.1W 50 KT 60 MPH 12H 16/0600Z 21.6N 123.3W 45 KT 50 MPH 24H 16/1800Z 22.5N 124.8W 40 KT 45 MPH 36H 17/0600Z 23.2N 126.0W 35 KT 40 MPH 48H 17/1800Z 23.5N 127.2W 30 KT 35 MPH 60H 18/0600Z 23.3N 128.4W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 18/1800Z 22.5N 129.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 19/1800Z...DISSIPATED $$ Forecaster Birchard
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Tropical Storm Karina Graphics
2020-09-15 22:44:26| National Hurricane Center (East Pacific)
5-Day Uncertainty Track last updated Tue, 15 Sep 2020 20:44:26 GMT Wind Speed Probabilities last updated Tue, 15 Sep 2020 20:44:26 GMT
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Summary for Tropical Storm Karina (EP1/EP162020)
2020-09-15 22:39:02| National Hurricane Center (East Pacific)
...COOLER WATERS WILL SOON WEAKEN KARINA... As of 2:00 PM PDT Tue Sep 15 the center of Karina was located near 20.7, -122.1 with movement NW at 12 mph. The minimum central pressure was 998 mb with maximum sustained winds of about 60 mph.
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Tropical Storm Karina Public Advisory Number 12
2020-09-15 22:39:02| National Hurricane Center (East Pacific)
Issued at 200 PM PDT Tue Sep 15 2020 000 WTPZ31 KNHC 152038 TCPEP1 BULLETIN Tropical Storm Karina Advisory Number 12 NWS National Hurricane Center Miami FL EP162020 Issued by NWS Central Pacific Hurricane Center Honolulu HI 200 PM PDT Tue Sep 15 2020 ...COOLER WATERS WILL SOON WEAKEN KARINA... SUMMARY OF 200 PM PDT...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...20.7N 122.1W ABOUT 795 MI...1280 KM W OF THE SOUTHERN TIP OF BAJA CALIFORNIA MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...NW OR 305 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 200 PM PDT (2100 UTC), the center of Tropical Storm Karina was located near latitude 20.7 North, longitude 122.1 West. Karina is moving toward the northwest near 12 mph (19 km/h), and this motion is expected to continue for the next day or so. Some slowing in forward speed and a turn toward the west and southwest is expected thereafter. Maximum sustained winds are near 60 mph (95 km/h) with higher gusts. Gradual weakening should begin by tonight, and Karina is forecast to become a remnant low in two or three days. Tropical-storm-force winds extend outward up to 105 miles (165 km) from the center. The estimated minimum central pressure is 998 mb (29.47 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 800 PM PDT. $$ Forecaster Birchard
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Tropical Storm Karina Forecast Advisory Number 12
2020-09-15 22:36:18| National Hurricane Center (East Pacific)
Issued at 2100 UTC TUE SEP 15 2020 000 WTPZ21 KNHC 152036 TCMEP1 TROPICAL STORM KARINA FORECAST/ADVISORY NUMBER 12 NWS NATIONAL HURRICANE CENTER MIAMI FL EP162020 ISSUED BY NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI 2100 UTC TUE SEP 15 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 20.7N 122.1W AT 15/2100Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 305 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 998 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 40NE 20SE 20SW 0NW. 34 KT....... 80NE 90SE 60SW 40NW. 12 FT SEAS..240NE 210SE 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 20.7N 122.1W AT 15/2100Z AT 15/1800Z CENTER WAS LOCATED NEAR 20.4N 121.7W FORECAST VALID 16/0600Z 21.6N 123.3W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 70NE 60SE 50SW 70NW. FORECAST VALID 16/1800Z 22.5N 124.8W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 60NE 50SE 40SW 70NW. FORECAST VALID 17/0600Z 23.2N 126.0W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 50NE 0SE 0SW 50NW. FORECAST VALID 17/1800Z 23.5N 127.2W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 18/0600Z 23.3N 128.4W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 18/1800Z 22.5N 129.5W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 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 19/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 20.7N 122.1W NEXT ADVISORY AT 16/0300Z $$ FORECASTER BIRCHARD
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