000WTNT41 KNHC 010314TCDAT1TROPICAL DEPRESSION ONE DISCUSSION NUMBER 1NWS NATIONAL HURRICANE CENTER MIAMI FL AL0120141100 PM EDT MON JUN 30 2014Convection associated with the area of low pressure off the eastcoast of Florida has increased and become a little more organizedduring the past few hours. Radar data shows that the convection hasdeveloped into a band over the southeastern and southern portions ofthe circulation. Based on these data, advisories are beinginitiated on the first tropical depression of the 2014 Atlantichurricane season. The initial intensity is set to 30 kt, which isin agreement with data from the earlier Air Force reservereconnaissance aircraft mission.The south to southwest motion of the cyclone over the past couple ofdays seems to have slowed this evening. The initial motionestimate is 225/2 kt. The model guidance indicates that thedepression should begin to move slowly westward tonight and earlyTuesday. After that time, a building mid-level ridge over thewestern Atlantic will begin to steer the cyclone northwestwardthen northward. A large deep-layer trough that is forecast toapproach the eastern United States in a couple of days, shouldcause the cyclone to turn northeast and accelerate. The modelguidance is in good agreement on this scenario, but there isstill significant uncertainty on how close the system will get tothe coast of the southeastern United States.Low shear and warm sea surface temperatures along the forecast trackare expected to allow gradual strengthening during the next fewdays. The depression is forecast to become a tropical storm onTuesday and this is in line with all of the reliable intensityguidance. The NHC intensity forecast is close to a blend of theSHIPS/LGEM guidance. Late in the forecast period, the cyclone isforecast to interact with the aforementioned trough and becomeextratropical by day 5.Due to the expected close approach of the system to the coast ofeast-central Florida and likely strengthening during thenext day or two, a tropical storm watch has been issued for portionsof that area. Interests elsewhere along the coast of thesoutheastern United States should monitor the progress of thissystem.FORECAST POSITIONS AND MAX WINDSINIT 01/0300Z 27.6N 79.1W 30 KT 35 MPH 12H 01/1200Z 27.6N 79.4W 35 KT 40 MPH 24H 02/0000Z 28.0N 79.7W 40 KT 45 MPH 36H 02/1200Z 28.8N 79.9W 45 KT 50 MPH 48H 03/0000Z 30.1N 79.9W 50 KT 60 MPH 72H 04/0000Z 33.0N 78.3W 60 KT 70 MPH 96H 05/0000Z 38.0N 72.0W 60 KT 70 MPH120H 06/0000Z 43.0N 64.5W 50 KT 60 MPH...POST-TROP/EXTRATROP$$Forecaster Brown
TROPICAL STORM ARTHUR FORECAST/ADVISORY NUMBER 3NWS NATIONAL HURRICANE CENTER MIAMI FL AL0120141500 UTC TUE JUL 01 2014CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...NONE.SUMMARY OF WATCHES AND WARNINGS IN EFFECT...A TROPICAL STORM WATCH IS IN EFFECT FOR...* EAST COAST OF FLORIDA FROM FORT PIERCE TO FLAGLER BEACHA TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS AREPOSSIBLE WITHIN THE WATCH AREA...IN THIS CASE WITHIN 24 TO 36 HOURS.INTERESTS ELSEWHERE ALONG THE SOUTHEAST COAST OF THE UNITED STATESSHOULD MONITOR THE PROGRESS OF THIS SYSTEM.TROPICAL STORM CENTER LOCATED NEAR 27.6N 79.3W AT 01/1500ZPOSITION ACCURATE WITHIN 20 NMPRESENT MOVEMENT TOWARD THE NORTHWEST OR 315 DEGREES AT 2 KTESTIMATED MINIMUM CENTRAL PRESSURE 1007 MBMAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT.34 KT....... 0NE 40SE 40SW 0NW.12 FT SEAS.. 0NE 40SE 40SW 0NW.WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICALMILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.REPEAT...CENTER LOCATED NEAR 27.6N 79.3W AT 01/1500ZAT 01/1200Z CENTER WAS LOCATED NEAR 27.5N 79.2WFORECAST VALID 02/0000Z 27.8N 79.4WMAX WIND 35 KT...GUSTS 45 KT.34 KT... 30NE 30SE 30SW 30NW.FORECAST VALID 02/1200Z 28.7N 79.6WMAX WIND 40 KT...GUSTS 50 KT.34 KT... 30NE 30SE 30SW 30NW.FORECAST VALID 03/0000Z 29.8N 79.5WMAX WIND 50 KT...GUSTS 60 KT.50 KT... 20NE 20SE 0SW 0NW.34 KT... 50NE 50SE 40SW 50NW.FORECAST VALID 03/1200Z 31.2N 78.9WMAX WIND 60 KT...GUSTS 75 KT.50 KT... 30NE 30SE 0SW 20NW.34 KT... 70NE 70SE 50SW 60NW.FORECAST VALID 04/1200Z 35.4N 75.2WMAX WIND 70 KT...GUSTS 85 KT.50 KT... 40NE 40SE 20SW 30NW.34 KT... 90NE 90SE 60SW 70NW.EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NMON DAY 4 AND 200 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAYOUTLOOK VALID 05/1200Z 40.8N 67.3WMAX WIND 65 KT...GUSTS 80 KT.OUTLOOK VALID 06/1200Z 45.5N 59.5W...POST-TROP/EXTRATROPMAX WIND 45 KT...GUSTS 55 KT.REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 27.6N 79.3WNEXT ADVISORY AT 01/2100Z$$FORECASTER STEWART
000WTNT41 KNHC 030859TCDAT1HURRICANE ARTHUR DISCUSSION NUMBER 10NWS NATIONAL HURRICANE CENTER MIAMI FL AL012014500 AM EDT THU JUL 03 2014Data from NOAA and Air Force Reserve Hurricane Hunter aircraftindicate that Arthur has reached hurricane strength. Both aircraftshowed several SFMR winds of 60 to 63 kt southeast of the center,and the NOAA aircraft reported a peak flight-level wind of 79 kt at8,000 feet. Based on these data the initial intensity is set to 65kt. Radar data show that Arthur was still having difficultymaintaining an eyewall overnight, likely due to dry mid/upper-levelair being entrained into the storm. However, the overall radarpresentation has improved during the past couple of hours. Somegradual intensification is forecast during the next 24 hours whilethe cyclone is in an environment of low shear and moves over warmwaters. After that time, however, the shear increases dramaticallyas Arthur interacts with a deep-layer baroclinic zone moving offof the east coast of North America, and global model fields showArthur completing extratropical transition by 72 hours. The NHCintensity forecast is similar to the previous one and remains closeto the multi-model consensus IVCN through 24 hours and is a littlebelow the consensus after that time.Radar data and aircraft fixes indicate that the current motion isnow a little east of due north, or 010 degrees at 8 knots. Arthurshould begin to recurve today ahead of the aforementioned deep-layertrough, and the track model guidance is in good agreement on thisscenario. The NHC track forecast is similar to the previous one andremains near the middle of the dynamical model envelope and closeto the TVCA multi-model consensus. The official forecast shows thecenter of Arthur moving very close to the North Carolina Outer Bankslate tonight and early Friday. Arthur should then acceleratenortheastward offshore of the mid-Atlantic states and thenortheastern U.S. Friday and Friday night, and move into theCanadian Maritimes by Saturday before turning northward by the endof the period.The track, intensity, and wind radii forecast during theextratropical phase of Arthur have been coordinated with the OceanPrediction Center.The new experimental potential storm surge flooding map isavailable at: www.nhc.noaa.gov/graphics_at1.shtml?inundationFORECAST POSITIONS AND MAX WINDSINIT 03/0900Z 31.3N 79.1W 65 KT 75 MPH 12H 03/1800Z 32.5N 78.3W 70 KT 80 MPH 24H 04/0600Z 34.7N 76.1W 75 KT 85 MPH 36H 04/1800Z 37.5N 72.6W 75 KT 85 MPH 48H 05/0600Z 40.9N 67.9W 70 KT 80 MPH 72H 06/0600Z 47.5N 60.0W 50 KT 60 MPH...POST-TROP/EXTRATROP 96H 07/0600Z 54.0N 52.0W 35 KT 40 MPH...POST-TROP/EXTRATROP120H 08/0600Z 60.0N 50.0W 35 KT 40 MPH...POST-TROP/EXTRATROP$$Forecaster Brennan