Invest 95W: Tropical Cyclone formation Alert. 97W: Medium

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WESTERN NORTH PACIFIC

INVEST 95W
As of 12:00 UTC Sep 13, 2019:
Location: 20.2°N 132.6°E
Maximum Winds: 25 kt
Minimum Central Pressure: 998 mb
WTPN21 PGTW 130930
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT (INVEST 95W)//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
110 NM EITHER SIDE OF A LINE FROM 18.8N 131.8E TO 24.7N 134.6E WITHIN
THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF
NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME. WINDS IN THE AREA
ARE ESTIMATED TO BE 18 TO 23 KNOTS. METSAT IMAGERY AT 091306Z
INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 19.3N 132.2E. THE
SYSTEM IS MOVING NORTHEASTWARD AT 03 KNOTS.
2. REMARKS: THE AREA OF CONVECTION (INVEST 95W) PREVIOUSLY LOCATED
NEAR 19.0N 132.2E IS NOW LOCATED NEAR 19.3N 132.2E, APPROXIMATELY 490
NM SOUTH-SOUTHEAST OF KADENA AB, JAPAN. THIS SYSTEM IS ASSESSED AS A
CIRCULATION EMBEDDED WITHIN THE SOUTHWESTERN PORTION OF A MONSOON
GYRE. MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A CONSOLIDATING
LOW-LEVEL CIRCULATION WITH PERSISTENT DEEP CONVECTIVE BANDING ALONG
THE WESTERN PERIPHERY. A 130114Z ASCAT-C IMAGE DEPICTS A WELL-DEFINED
LOW-LEVEL CIRCULATION CENTER WITH DIRECTLY-ASSOCIATED 15-20 KT WINDS
TO THE SOUTH AND WEST. A 130625 SSMI 85GHZ IMAGE ALSO SHOWS A CLOSED,
AND NEARLY SYMMETRIC, LOW-LEVEL CIRCULATION. STRONGER WINDS IN EXCESS
OF 35 KNOTS ARE EVIDENT FARTHER TO THE SOUTH OF CIRCULATION, ALONG
THE PERIPHERY OF THE MONSOON GYRE WITHIN WHICH INVEST 95W IS
EMBEDDED. THIS DISTURBANCE IS LOCATED IN AN AREA MARGINALLY FAVORABLE
FOR DEVELOPMENT WITH DIFFLUENT UPPER LEVEL WINDS AND WARM SEA SURFACE
TEMPERATURES (29-30 CELSIUS), OFFSET BY MODERATE TO HIGH VERTICAL
WIND SHEAR (15-20 KNOTS). GLOBAL MODELS PREDICT THAT 95W WILL
CONTINUE TO SLOWLY CONSOLIDATE AS IT TRACKS GENERALLY POLEWARD OVER
THE NEXT FEW DAYS ALONG WITH THE MONSOON GYRE WITHIN WHICH IT IS
EMBEDDED. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20
KNOTS, WITH NOTED STRONGER WINDS WELL TO THE SOUTH OF THE CENTER.
MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 997 MB. THE
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE
WITHIN THE NEXT 24 HOURS IS HIGH.
3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY
140930Z.//
NNNN

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INVEST 97W
As of 12:00 UTC Sep 13, 2019:
Location: 13.1°N 155.4°E
Maximum Winds: 20 kt
Minimum Central Pressure: 1005 mb
ABPW10 PGTW 131000
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY:
      (3) THE AREA OF CONVECTION (INVEST 97W) PREVIOUSLY LOCATED NEAR
PERSISTED NEAR 10.3N 159.2E IS NOW LOCATED NEAR 12.7N 156.2E,
APPROXIMATELY 680 NM EAST OF GUAM. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY (MSI) AND A 130752 SSMIS 91GHZ IMAGE DEPICT A DEVELOPING,
COMPACT LOW LEVEL CIRCULATION WITH A BAND OF PATCHY DEEP CONVECTION
ALONG THE WESTERN PERIPHERY. THIS CIRCULATION IS SITUATED IN AN AREA
OF LOW TO MODERATE VERTICAL WIND SHEAR (10-15 KNOTS), WARM SEA
SURFACE TEMPERATURES (29-30 CELSIUS) AND FAVORABLE EQUATORWARD
OUTFLOW ALOFT. NUMERICAL MODELS INDICATE STEADY DEVELOPMENT AND
FURTHER CONSOLIDATION OF THIS SYSTEM AS IT TRACKS NORTHWESTWARD OVER
THE NEXT FEW DAYS. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT
15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR
1008 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL
CYCLONE WITHIN THE NEXT 24 IS UPGRADED TO MEDIUM.

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INVEST 98W
As of 12:00 UTC Sep 13, 2019:
Location: 25.4°N 141.4°E
Maximum Winds: 20 kt
Minimum Central Pressure: 1000 mb
ABPW10 PGTW 131000
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY:
      (2) AN AREA OF CONVECTION (INVEST 98W) HAS PERSISTED NEAR 23.1N
139.9E, APPROXIMATELY 125 NM SOUTHWEST OF IWO TO. THIS SYSTEM IS
ASSESSED AS A DEVELOPING CIRCULATION EMBEDDED WITHIN THE NORTHEASTERN
PORTION OF A MONSOON GYRE. RECENT ANIMATED MSI SHOWS DEEP CONVECTION
DEVELOPING OVER THE EAST PORTION OF A TIGHTENING LOW-LEVEL TROUGH
EVIDENT IN A 130039Z ASCAT-C PASS. THIS DISTURBANCE IS SITUATED IN AN
AREA OF LOW TO MODERATE (10-15 KNOTS) VERTICAL WIND SHEAR AND
FAVORABLE EASTWARD AND EQUATORWARD OUTFLOW ALOFT. GLOBAL MODELS
INDICATE SEVERAL POSSIBLE OUTCOMES FOR THIS DISTURBANCE, WITH SOME
SOLUTIONS INDICATING THAT IT WILL SEPARATE FROM THE BROADER MONSOON
GYRE AND CONSOLIDATE AND OTHERS INDICATING THAT IT WILL REMAIN
EMBEDDED WITHIN THE MONSOON GYRE. MAXIMUM SUSTAINED SURFACE WINDS ARE
ESTIMATED AT 15 TO 20 KNOTS, WITH STRONGER 25-30 KNOT WINDS
ASSOCIATED WITH THE MONSOON GYRE CIRCULATION EVIDENT WELL TO THE EAST
OF THE DEVELOPING CENTER. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO
BE NEAR 1002 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS LOW.