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Western Pacific: 16W// Eastern Pacific: 11E(KEVIN) and 12E(LINDA)// Atlantic: 06L(FRED), 11/09utc updates



JTWC ARE ISSUING 6HOURLY WARNINGS AND 3HOURLY SATELLITE BULLETINS ON TD 16W.
JTWC ARE ISSUING 6HOURLY WARNINGS AND 3HOURLY SATELLITE BULLETINS ON TD 16W.

11/00UTC.
11/00UTC.

TD 04W. WARNING 4 ISSUED AT 11/09UTC.THERE ARE NO SIGNIFICANT CHANGES TO THE FORECAST FROM THE PREVIOUS WARNING.  FORECAST DISCUSSION: TROPICAL DEPRESSION 16W (SIXTEEN) IS FORECAST TO CONTINUE TRACKING GENERALLY WESTWARD ALONG THE SOUTHERN PERIPHERY OF THE SUBTROPICAL RIDGE THROUGH THE ENTIRETY OF THE FORECAST. CIMSS MOTION VECTOR ANALYSIS AND JTWC HAND ANALYSIS INDICATE THE PRESENCE OF AN UPPER-LEVEL POINT SOURCE JUST EAST OF THE LOW LEVEL CIRCULATION CENTER(LLCC), WHICH SUPPORTS THE FLARING CONVECTION TO THE EAST OF THE CENTER. THE CIMSS ANALYSIS ALSO REVEALS ONLY LOW VERTICAL WIND SHEAR(VWS) OVER THE SYSTEM, BUT MODEL-DERIVED CROSS-SECTIONS SHOW THE PRESENCE OF MORE MODERATE LEVELS OF SHEAR AND THE PRESENCE OF RELATIVELY DRY AIR IN THE 600-400 MB LAYER, WHICH IS BORNE OUT BY THE OVERALL PRESENTATION OF THE SYSTEM AT 0600UTC. OUTFLOW REMAINS RELATIVELY GOOD TO POLEWARD ALONG THE EASTERN SIDE OF A TUTT CENTERED ABOUT 1480 KM TO THE NORTHWEST. SHEAR IS EXPECTED TO RELAX A BIT OVER THE NEXT 12 TO 24 HOURS, WHICH SHOULD ALLOW FOR A BRIEF PERIOD OF WEAK INTENSIFICATION TO 35 KNOTS THROUGH 24H. THEREAFTER THE UPPER-LEVEL PATTERN IS FORECAST TO CHANGE, WITH NORTHEASTERLY FLOW MOVING DOWN ON TOP OF THE SYSTEM, WEAKENING THE OUTFLOW ALOFT. WHILE SHEAR WILL REMAIN RELATIVELY LOW DURING THIS TIME, THE LACK OF A STRONG OUTFLOW MECHANISM WILL LEAD TO STEADY WEAKENING THROUGH 72H. THE CONTINUING WEAK EQUATORWARD OUTFLOW WILL OFFSET LOW TO MODERATE VWS AND WARM SSTS, WITH TD 16W MAINTAINING WEAK TROPICAL DEPRESSION STRENGTH THROUGH 120H, THOUGH THE POSSIBILITY OF DISSIPATION AFTER TAU 96H CANNOT BE RULED OUT.
TD 04W. WARNING 4 ISSUED AT 11/09UTC.THERE ARE NO SIGNIFICANT CHANGES TO THE FORECAST FROM THE PREVIOUS WARNING. FORECAST DISCUSSION: TROPICAL DEPRESSION 16W (SIXTEEN) IS FORECAST TO CONTINUE TRACKING GENERALLY WESTWARD ALONG THE SOUTHERN PERIPHERY OF THE SUBTROPICAL RIDGE THROUGH THE ENTIRETY OF THE FORECAST. CIMSS MOTION VECTOR ANALYSIS AND JTWC HAND ANALYSIS INDICATE THE PRESENCE OF AN UPPER-LEVEL POINT SOURCE JUST EAST OF THE LOW LEVEL CIRCULATION CENTER(LLCC), WHICH SUPPORTS THE FLARING CONVECTION TO THE EAST OF THE CENTER. THE CIMSS ANALYSIS ALSO REVEALS ONLY LOW VERTICAL WIND SHEAR(VWS) OVER THE SYSTEM, BUT MODEL-DERIVED CROSS-SECTIONS SHOW THE PRESENCE OF MORE MODERATE LEVELS OF SHEAR AND THE PRESENCE OF RELATIVELY DRY AIR IN THE 600-400 MB LAYER, WHICH IS BORNE OUT BY THE OVERALL PRESENTATION OF THE SYSTEM AT 0600UTC. OUTFLOW REMAINS RELATIVELY GOOD TO POLEWARD ALONG THE EASTERN SIDE OF A TUTT CENTERED ABOUT 1480 KM TO THE NORTHWEST. SHEAR IS EXPECTED TO RELAX A BIT OVER THE NEXT 12 TO 24 HOURS, WHICH SHOULD ALLOW FOR A BRIEF PERIOD OF WEAK INTENSIFICATION TO 35 KNOTS THROUGH 24H. THEREAFTER THE UPPER-LEVEL PATTERN IS FORECAST TO CHANGE, WITH NORTHEASTERLY FLOW MOVING DOWN ON TOP OF THE SYSTEM, WEAKENING THE OUTFLOW ALOFT. WHILE SHEAR WILL REMAIN RELATIVELY LOW DURING THIS TIME, THE LACK OF A STRONG OUTFLOW MECHANISM WILL LEAD TO STEADY WEAKENING THROUGH 72H. THE CONTINUING WEAK EQUATORWARD OUTFLOW WILL OFFSET LOW TO MODERATE VWS AND WARM SSTS, WITH TD 16W MAINTAINING WEAK TROPICAL DEPRESSION STRENGTH THROUGH 120H, THOUGH THE POSSIBILITY OF DISSIPATION AFTER TAU 96H CANNOT BE RULED OUT.
1621080700  77N1670W  15
1621080706  78N1678W  20
1621080712  80N1684W  20
1621080718  88N1688W  25
1621080800  95N1694W  25
1621080806  99N1705W  20
1621080812 100N1719W  20
1621080818 105N1730W  20
1621080900 110N1740W  20
1621080906 115N1751W  20
1621080912 117N1764W  20
1621080918 120N1789W  20
1621081000 121N1797W  20
1621081006 122N1795E  20
1621081012 122N1787E  25
1621081018 122N1780E  30
1621081100 123N1772E  30
1621081106 124N1766E  30
NNNN


TD 16W. SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION: ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) CONFIRMS THAT TD 16W CONTINUES TO STRUGGLE AGAINST STUBBORN WESTERLY VERTICAL WIND SHEAR (VWS). THE ANIMATED IMAGERY SHOWS THE EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC) IS DISPLACED ABOUT 185 KM TO THE WEST OF THE CENTER OF THE FLARING DEEP CONVECTION. THE FLARING CONVECTION IS SOMEWHAT SURPRISINGLY VERY SYMMETRICAL IN APPEARANCE GIVEN THE SHEARED NATURE  OF THE SYSTEM AND ANIMATED SHORTWAVE INFRARED (SWIR) AFTER THE 0600UTC  HOUR INDICATES THE CONVECTIVE MASS IS EXPANDING TO THE WEST,  POSSIBLY INDICATING THE SHEAR MAY BE WEAKENING SLIGHTLY. BASED ON  THE EXPOSED LLCC IN THE MSI, THE INITIAL POSITION IS PLACED WITH  HIGH CONFIDENCE. THE INITIAL INTENSITY HAS REMAINED STEADY AT 30  KNOTS, ASSESSED WITH MEDIUM CONFIDENCE BASED ON THE AVERAGE OF MULTI- AGENCY DVORAK ESTIMATES AND THE ADT ESTIMATE.
TD 16W. SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION: ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) CONFIRMS THAT TD 16W CONTINUES TO STRUGGLE AGAINST STUBBORN WESTERLY VERTICAL WIND SHEAR (VWS). THE ANIMATED IMAGERY SHOWS THE EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC) IS DISPLACED ABOUT 185 KM TO THE WEST OF THE CENTER OF THE FLARING DEEP CONVECTION. THE FLARING CONVECTION IS SOMEWHAT SURPRISINGLY VERY SYMMETRICAL IN APPEARANCE GIVEN THE SHEARED NATURE OF THE SYSTEM AND ANIMATED SHORTWAVE INFRARED (SWIR) AFTER THE 0600UTC HOUR INDICATES THE CONVECTIVE MASS IS EXPANDING TO THE WEST, POSSIBLY INDICATING THE SHEAR MAY BE WEAKENING SLIGHTLY. BASED ON THE EXPOSED LLCC IN THE MSI, THE INITIAL POSITION IS PLACED WITH HIGH CONFIDENCE. THE INITIAL INTENSITY HAS REMAINED STEADY AT 30 KNOTS, ASSESSED WITH MEDIUM CONFIDENCE BASED ON THE AVERAGE OF MULTI- AGENCY DVORAK ESTIMATES AND THE ADT ESTIMATE.

TD 16W. MODEL DISCUSSION: TRACK GUIDANCE IS IN GOOD AGREEMENT WITH THE MAJORITY OF THE TRACKERS CLUSTERED WITHIN A TIGHT 90 KM ENVELOPE AT 48H INCREASING TO 220 KM AT 120H. THE NVGM REMAINS THE POLEWARD OUTLIER, WHILE GFS MARKS THE SOUTHERN OUTLIER, PARTICULARLY AFTER 72H AS IT TRACKS OFF TO THE SOUTHWEST. THE JTWC FORECAST REMAINS CONSISTENT WITH THE PREVIOUS FORECAST AND THE CLOSE TO THE MULTI-MODEL CONSENSUS WITH HIGH CONFIDENCE. AS THROUGH THE DURATION OF THE FORECAST PERIOD. INTENSITY GUIDANCE REMAINS CONSISTENTLY MIXED, WITH ALL GUIDANCE EXCEPT SHIPS-GFS INDICATING A GENERALLY FLAT INTENSITY TREND FOR THE DURATION OF THE FORECAST. THE JTWC FORECAST JUST ABOVE THE CONSENSUS THROUGH 24H, THEN SLIGHTLY BELOW FOR THE REMAINDER OF THE FORECAST PERIOD. THE POSSIBILITY OF DISSIPATION AFTER 96H INDUCES LOW CONFIDENCE IN THE INTENSITY FORECAST AFTER THIS POINT.
TD 16W. MODEL DISCUSSION: TRACK GUIDANCE IS IN GOOD AGREEMENT WITH THE MAJORITY OF THE TRACKERS CLUSTERED WITHIN A TIGHT 90 KM ENVELOPE AT 48H INCREASING TO 220 KM AT 120H. THE NVGM REMAINS THE POLEWARD OUTLIER, WHILE GFS MARKS THE SOUTHERN OUTLIER, PARTICULARLY AFTER 72H AS IT TRACKS OFF TO THE SOUTHWEST. THE JTWC FORECAST REMAINS CONSISTENT WITH THE PREVIOUS FORECAST AND THE CLOSE TO THE MULTI-MODEL CONSENSUS WITH HIGH CONFIDENCE. AS THROUGH THE DURATION OF THE FORECAST PERIOD. INTENSITY GUIDANCE REMAINS CONSISTENTLY MIXED, WITH ALL GUIDANCE EXCEPT SHIPS-GFS INDICATING A GENERALLY FLAT INTENSITY TREND FOR THE DURATION OF THE FORECAST. THE JTWC FORECAST JUST ABOVE THE CONSENSUS THROUGH 24H, THEN SLIGHTLY BELOW FOR THE REMAINDER OF THE FORECAST PERIOD. THE POSSIBILITY OF DISSIPATION AFTER 96H INDUCES LOW CONFIDENCE IN THE INTENSITY FORECAST AFTER THIS POINT.

EASTERN PACIFIC. TS 11E(KEVIN). WARNING 16 ISSUED AT 11/10UTC.
EASTERN PACIFIC. TS 11E(KEVIN). WARNING 16 ISSUED AT 11/10UTC.
1121080612 150N1020W  25
1121080618 152N1028W  25
1121080700 154N1035W  25
1121080706 155N1043W  25
1121080712 156N1052W  30
1121080718 156N1062W  35
1121080800 156N1070W  40
1121080806 156N1078W  45
1121080812 157N1086W  50
1121080818 157N1094W  50
1121080900 159N1100W  45
1121080906 161N1106W  45
1121080912 167N1110W  45
1121080918 169N1117W  40
1121081000 173N1127W  40
1121081006 179N1135W  40
1121081012 183N1143W  40
1121081018 186N1149W  45
1121081100 190N1154W  45
1121081106 194N1159W  40
NNNN
 

TS 11E(KEVIN). GUIDANCE.
TS 11E(KEVIN). GUIDANCE.

TS 12E(LINDA). WARNING 5 ISSUED AT 11/10UTC. INTENSITY IS FORECAST TO PEAK AT 85KNOTS/CAT 2 BY 14/06UTC.
TS 12E(LINDA). WARNING 5 ISSUED AT 11/10UTC. INTENSITY IS FORECAST TO PEAK AT 85KNOTS/CAT 2 BY 14/06UTC.
1221080818 107N 944W  20
1221080900 111N 956W  25
1221080906 115N 968W  25
1221080912 119N 981W  30
1221080918 123N 991W  30
1221081000 126N 999W  30
1221081006 130N1007W  30
1221081012 135N1016W  30
1221081018 141N1023W  40
1221081100 142N1031W  45
1221081106 142N1040W  45
NNNN

TS 12E(LINDA). GUIDANCE.
TS 12E(LINDA). GUIDANCE.

11/00UTC.
11/00UTC.

 

ATLANTIC. TS 06L(FRED). WARNING 7 ISSUED AT 11/09UTC.
ATLANTIC. TS 06L(FRED). WARNING 7 ISSUED AT 11/09UTC.
0621080718 112N 493W  25
0621080800 113N 503W  25
0621080806 115N 514W  25
0621080812 119N 528W  25
0621080818 122N 540W  25
0621080900 126N 552W  25
0621080906 130N 564W  25
0621080912 134N 576W  25
0621080918 139N 587W  30
0621081000 146N 601W  30
0621081006 153N 615W  30
0621081012 160N 631W  30
0621081018 167N 646W  30
0621081100 174N 661W  35
0621081106 177N 676W  35

TS 06L. GUIDANCE.
TS 06L. GUIDANCE.
Rédigé par PATRICK HOAREAU le Wednesday, August 11th 2021 à 16:00