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Tropical Depression Seventeen Forecast Discussion Number 1
2020-09-07 04:37:38| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Sun Sep 06 2020 306 WTNT42 KNHC 070237 TCDAT2 Tropical Depression Seventeen Discussion Number 1 NWS National Hurricane Center Miami FL AL172020 1100 PM AST Sun Sep 06 2020 The tropical low that the National Hurricane Center has been tracking the past few days west of the Cabo Verde Islands has developed enough convective banding for the system to be classified as a tropical depression. A 06/2345Z ASCAT-B scatterometer pass indicated surface wind speeds of 30-31 kt north of the center, which are supported by a T2.0/30 kt Dvorak satellite intensity estimate from TAFB at 07/0000 UTC. The initial motion estimate is an uncertain 270/04kt. The center has been jumping around somewhat due to small, brief convective bursts that then dissipate, leaving small swirls rotating around the mean circulation center. However, the latest ASCAT data showed a much better defined overall circulation, especially in the inner core wind field region, so the forward motion should stabilize fairly soon. The depression is expected to remain caught in weak steering flow for the next 5 days, so only a slow westward motion is expected tonight and Monday, followed by a west-northwestward motion by later Monday and Tuesday that will continue through the remainder of the 120-h forecast period. Possible track forecast complications could develop by days 3-5 if binary interaction occurs between the depression and the large low (Invest 93L) currently located southeast of the Cabo Verde Islands, resulting in TD-17 not gaining as much latitude as currently indicated. The NHC forecast track lies down the middle of the simple- and corrected-consensus model guidance envelope. The depression is only forecast to slowly strengthen for the next 4 days or so due to expected intrusions of dry mid-level air. By day 5, increasing southerly vertical wind shear on the east side of a large upper-level low that is forecast to cut off north of Puerto Rico is expected to induce gradual weakening. However, both the timing of the development of the low and its west-southwestward motion will determine if sufficient shear will prevent further strengthening after 96 h; a slower formation of the low and/or a slower retrograding motion would result in at least less weakening. The NHC intensity forecast closely follows an average of the IVCN and NOAA-HCCA intensity consensus models. FORECAST POSITIONS AND MAX WINDS INIT 07/0300Z 17.0N 41.5W 30 KT 35 MPH 12H 07/1200Z 17.0N 42.1W 30 KT 35 MPH 24H 08/0000Z 17.2N 42.7W 35 KT 40 MPH 36H 08/1200Z 17.5N 43.4W 40 KT 45 MPH 48H 09/0000Z 18.0N 44.6W 45 KT 50 MPH 60H 09/1200Z 18.6N 46.3W 50 KT 60 MPH 72H 10/0000Z 19.2N 48.2W 55 KT 65 MPH 96H 11/0000Z 20.4N 51.9W 50 KT 60 MPH 120H 12/0000Z 21.2N 55.5W 45 KT 50 MPH $$ Forecaster Stewart
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Tropical Depression Seventeen Public Advisory Number 1
2020-09-07 04:32:08| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Sun Sep 06 2020 000 WTNT32 KNHC 070232 TCPAT2 BULLETIN Tropical Depression Seventeen Advisory Number 1 NWS National Hurricane Center Miami FL AL172020 1100 PM AST Sun Sep 06 2020 ...NEW DEPRESSION FORMS OVER THE CENTRAL TROPICAL ATLANTIC... ...EXPECTED TO BECOME A TROPICAL STORM ON MONDAY... SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...17.0N 41.5W ABOUT 1160 MI...1865 KM W OF THE CABO VERDE ISLANDS ABOUT 1425 MI...2290 KM E OF THE NORTHERN LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 5 MPH...7 KM/H MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM AST (0300 UTC), the center of Tropical Depression Seventeen was located near latitude 17.0 North, longitude 41.5 West. The depression is moving toward the west near 5 mph (7 km/h) and this motion is forecast to continue into Monday. By late Monday and Tuesday, a turn toward the west-northwest is expected, and that motion should continue into Wednesday. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Slow strengthening is forecast during the next 48 hours, and the depression is expected to become a tropical storm on Monday. The estimated minimum central pressure is 1006 mb (29.71 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Stewart
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Tropical Depression Seventeen Wind Speed Probabilities Number 1
2020-09-07 04:32:08| National Hurricane Center (Atlantic)
Issued at 0300 UTC MON SEP 07 2020 000 FONT12 KNHC 070232 PWSAT2 TROPICAL DEPRESSION SEVENTEEN WIND SPEED PROBABILITIES NUMBER 1 NWS NATIONAL HURRICANE CENTER MIAMI FL AL172020 0300 UTC MON SEP 07 2020 AT 0300Z THE CENTER OF TROPICAL DEPRESSION SEVENTEEN WAS LOCATED NEAR LATITUDE 17.0 NORTH...LONGITUDE 41.5 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 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 00Z MON 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 MON 12Z MON 00Z TUE 12Z TUE 00Z WED 00Z THU 00Z FRI PERIODS TO TO TO TO TO TO TO 12Z MON 00Z TUE 12Z TUE 00Z WED 00Z THU 00Z FRI 00Z SAT FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER STEWART
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Tropical Depression Seventeen Forecast Advisory Number 1
2020-09-07 04:31:39| National Hurricane Center (Atlantic)
Issued at 0300 UTC MON SEP 07 2020 874 WTNT22 KNHC 070231 TCMAT2 TROPICAL DEPRESSION SEVENTEEN FORECAST/ADVISORY NUMBER 1 NWS NATIONAL HURRICANE CENTER MIAMI FL AL172020 0300 UTC MON SEP 07 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 17.0N 41.5W AT 07/0300Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 4 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 12 FT SEAS..150NE 0SE 0SW 150NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 17.0N 41.5W AT 07/0300Z AT 07/0000Z CENTER WAS LOCATED NEAR 17.0N 41.3W FORECAST VALID 07/1200Z 17.0N 42.1W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 08/0000Z 17.2N 42.7W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 50NE 30SE 0SW 40NW. FORECAST VALID 08/1200Z 17.5N 43.4W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 60NE 50SE 30SW 40NW. FORECAST VALID 09/0000Z 18.0N 44.6W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 90NE 80SE 0SW 60NW. FORECAST VALID 09/1200Z 18.6N 46.3W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 0SE 0SW 0NW. 34 KT...120NE 80SE 40SW 80NW. FORECAST VALID 10/0000Z 19.2N 48.2W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 40NE 0SE 0SW 30NW. 34 KT...120NE 80SE 40SW 80NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 11/0000Z 20.4N 51.9W MAX WIND 50 KT...GUSTS 60 KT. OUTLOOK VALID 12/0000Z 21.2N 55.5W MAX WIND 45 KT...GUSTS 55 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 17.0N 41.5W NEXT ADVISORY AT 07/0900Z $$ FORECASTER STEWART
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Tropical Storm Julio Forecast Discussion Number 5
2020-09-06 22:35:06| National Hurricane Center (East Pacific)
Issued at 300 PM MDT Sun Sep 06 2020 000 WTPZ45 KNHC 062034 TCDEP5 Tropical Storm Julio Discussion Number 5 NWS National Hurricane Center Miami FL EP152020 300 PM MDT Sun Sep 06 2020 Julio remains a compact tropical storm that is producing a small area of deep convection near and to the west of the center. A recent ASCAT-A overpass showed maximum winds around 30 kt, which was lower than in previous passes. Based on that data and the latest Dvorak classifications, the initial intensity is lowered to 35 kt. The ASCAT data also suggest that the circulation of Julio is not as well defined on the south side as it was earlier. As mentioned in the previous discussion, Julio's future is somewhat unclear. The ECMWF and UKMET models show Julio becoming absorbed by a larger low just to its southwest in a couple of days. Conversely, the GFS, HWRF, and HMON models show Julio being the dominant feature, with the latter two aids even showing strengthening. Since confidence is low on which scenario will play out, it seems best to hold continuity for now, which ends up leaning closer to the ECMWF/UKMET solutions. The NHC intensity forecast is a little lower than the previous one given the lower initial intensity. The tropical storm is moving west-northwestward at about 17 kt. Julio should continue to move westward to west-northwestward at a fairly quick pace for another 12-24 hours. However, after that time, a notable slow down should occur as the ridge over the eastern Pacific breaks down and leaves the cyclone in weak steering currents. The new NHC track forecast is adjusted to the south of the previous one to come into better agreement with the latest models. FORECAST POSITIONS AND MAX WINDS INIT 06/2100Z 19.3N 110.0W 35 KT 40 MPH 12H 07/0600Z 19.6N 112.3W 40 KT 45 MPH 24H 07/1800Z 19.7N 114.2W 40 KT 45 MPH 36H 08/0600Z 19.6N 115.4W 40 KT 45 MPH 48H 08/1800Z 19.4N 116.1W 35 KT 40 MPH 60H 09/0600Z 19.2N 116.7W 35 KT 40 MPH...POST-TROPICAL 72H 09/1800Z...DISSIPATED $$ Forecaster Cangialosi
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