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Tropical Storm Julian Forecast Advisory Number 4
2021-08-29 22:38:42| National Hurricane Center (Atlantic)
Issued at 2100 UTC SUN AUG 29 2021 000 WTNT21 KNHC 292038 TCMAT1 TROPICAL STORM JULIAN FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL112021 2100 UTC SUN AUG 29 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 36.7N 44.6W AT 29/2100Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 21 KT ESTIMATED MINIMUM CENTRAL PRESSURE 995 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 0NE 40SE 0SW 0NW. 34 KT....... 70NE 90SE 40SW 0NW. 12 FT SEAS.. 30NE 120SE 90SW 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 36.7N 44.6W AT 29/2100Z AT 29/1800Z CENTER WAS LOCATED NEAR 36.0N 45.6W FORECAST VALID 30/0600Z 38.8N 41.4W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 0NE 50SE 0SW 0NW. 34 KT... 70NE 100SE 50SW 0NW. FORECAST VALID 30/1800Z 42.2N 38.1W...POST-TROP/EXTRATROP MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 40NE 50SE 0SW 0NW. 34 KT... 70NE 100SE 50SW 0NW. FORECAST VALID 31/0600Z 46.3N 36.8W...POST-TROP/EXTRATROP MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 40SE 0SW 0NW. 34 KT... 80NE 90SE 50SW 40NW. FORECAST VALID 31/1800Z 51.0N 37.7W...POST-TROP/EXTRATROP MAX WIND 45 KT...GUSTS 55 KT. 34 KT...100NE 80SE 30SW 40NW. FORECAST VALID 01/0600Z 55.0N 39.6W...POST-TROP/EXTRATROP MAX WIND 40 KT...GUSTS 50 KT. 34 KT...100NE 70SE 0SW 50NW. FORECAST VALID 01/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 36.7N 44.6W NEXT ADVISORY AT 30/0300Z $$ FORECASTER LATTO
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Tropical Storm Julian Graphics
2021-08-29 16:54:18| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Sun, 29 Aug 2021 14:54:18 GMT Wind Speed Probabilities last updated Sun, 29 Aug 2021 14:54:18 GMT
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Tropical Storm Julian Forecast Discussion Number 3
2021-08-29 16:53:37| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Sun Aug 29 2021 000 WTNT41 KNHC 291453 TCDAT1 Tropical Storm Julian Discussion Number 3 NWS National Hurricane Center Miami FL AL112021 1100 AM AST Sun Aug 29 2021 The system has become better organized this morning, with the low-level center located on the southwestern edge of a persistent mass of deep convection. A 1246 UTC ASCAT-B pass revealed an area of winds over 40 kt southeast of the center, so the system is upgraded to Tropical Storm Julian with maximum winds of 45 kt. Julian is accelerating toward the northeast (045/15 kt) in the flow to the south of a deep-layer area of low pressure located just east of Newfoundland. The storm is expected to move around the southeastern and eastern periphery of this large low during the next few days, accelerating further and turning toward the north by 48 hours. The track models are all in good agreement on this scenario, and the NHC track forecast is very close to the TVCA and HCCA consensus aids. This new forecast is also relatively unchanged from the previous advisory. Winds in the storm have increased faster than expected, even in the face of 20 kt of west-southwesterly shear. This shear is forecast to increase substantially in the coming days, with SHIPS diagnostics indicating it may reach magnitudes of 40-50 kt. However, the storm will still be moving over marginally warm waters around 26 degrees Celsius, and its fast motion and some baroclinic forcing could allow for additional strengthening during the next 12-24 hours. Nearly all the intensity models support some strengthening, and the NHC official forecast peaks the winds at 55 kt in 24 hours, roughly between the IVCN and HCCA solutions. Phase-space diagrams suggest that Julian will probably already be going through extratropical transition at that time, and it should be fully extratropical by 36 hours. Gradual weakening is anticipated after 24 hours, and the extratropical low is likely to dissipate over the north Atlantic by day 3. FORECAST POSITIONS AND MAX WINDS INIT 29/1500Z 35.1N 46.8W 45 KT 50 MPH 12H 30/0000Z 36.9N 43.7W 50 KT 60 MPH 24H 30/1200Z 40.0N 39.7W 55 KT 65 MPH 36H 31/0000Z 43.6N 37.0W 50 KT 60 MPH...POST-TROP/EXTRATROP 48H 31/1200Z 48.0N 36.8W 45 KT 50 MPH...POST-TROP/EXTRATROP 60H 01/0000Z 52.2N 38.2W 40 KT 45 MPH...POST-TROP/EXTRATROP 72H 01/1200Z...DISSIPATED $$ Forecaster Berg
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Tropical Storm Julian Wind Speed Probabilities Number 3
2021-08-29 16:53:37| National Hurricane Center (Atlantic)
Issued at 1500 UTC SUN AUG 29 2021 000 FONT11 KNHC 291453 PWSAT1 TROPICAL STORM JULIAN WIND SPEED PROBABILITIES NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL112021 1500 UTC SUN AUG 29 2021 AT 1500Z THE CENTER OF TROPICAL STORM JULIAN WAS LOCATED NEAR LATITUDE 35.1 NORTH...LONGITUDE 46.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 45 KTS...50 MPH...85 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 SUN 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 SUN 00Z MON 12Z MON 00Z TUE 12Z TUE 12Z WED 12Z THU PERIODS TO TO TO TO TO TO TO 00Z MON 12Z MON 00Z TUE 12Z TUE 12Z WED 12Z THU 12Z FRI FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER BERG
Summary for Tropical Storm Julian (AT1/AL112021)
2021-08-29 16:53:06| National Hurricane Center (Atlantic)
...TROPICAL STORM JULIAN FORMS OVER THE CENTRAL SUBTROPICAL ATLANTIC... ...EXPECTED TO BECOME POST-TROPICAL ON MONDAY... As of 11:00 AM AST Sun Aug 29 the center of Julian was located near 35.1, -46.8 with movement NE at 17 mph. The minimum central pressure was 998 mb with maximum sustained winds of about 50 mph.
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