Vietnam/ Laos/ Thailand: Tropical Storm SONCA 08W 25/0900Z nr 17.1°N 107.0°E, moving W 09 knots (CMA) – Published 25 Jul 2017 1257z (GMT/UTC)

Tropical Storm SONCA 08W

MAXIMUM SIGNIFICANT WAVE HEIGHT AT 250600Z IS 12 FEET (JTWC)

Typhoon Message

20170725 17:17


National Meteorological Center No.306
Analysis Time: Jul. 25th 09 UTC
Name of TC: SONCA
Num. of TC: 1708
Current Location: 17.1°N 107.0°E
Max. 10-min Wind Speed: 20m/s(72km/h)
Central Pressure: 996hPa
Radius of 34knots Winds: NE 90km SE 90km SW 90km NW 90km
Forecast movement: next 24hrs SONCA will moving W at speed of 15km/h

 

 

TS 1708 (Sonca)
Issued at 10:10 UTC, 25 July 2017

<Analysis at 09 UTC, 25 July>
Scale
Intensity
Center position N16°55′ (16.9°)
E106°55′ (106.9°)
Direction and speed of movement W 15 km/h (9 kt)
Central pressure 994 hPa
Maximum wind speed near center 18 m/s (35 kt)
Maximum wind gust speed 25 m/s (50 kt)
≥ 30 kt wind area ALL 110 km (60 NM)
<Forecast for 21 UTC, 25 July>
Intensity
TD
Center position of probability circle N16°55′ (16.9°)
E104°55′ (104.9°)
Direction and speed of movement W 20 km/h (10 kt)
Central pressure 1000 hPa
Radius of probability circle 60 km (30 NM)
<Forecast for 09 UTC, 26 July>
Intensity
TD
Center position of probability circle N17°00′ (17.0°)
E102°50′ (102.8°)
Direction and speed of movement W 20 km/h (10 kt)
Central pressure 1002 hPa
Radius of probability circle 90 km (50 NM)

Joint Typhoon Warning Center (JTWC)

Tropical Storm 08W (Sonca) Warning #18 Final Warning
Issued at 25/0900Z

 

 

WTPN32 PGTW 250900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL STORM 08W (SONCA) WARNING NR 018
03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY

WARNING POSITION:
250600Z — NEAR 17.0N 107.2E
MOVEMENT PAST SIX HOURS – 275 DEGREES AT 12 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS – 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
RADIUS OF 034 KT WINDS – 045 NM NORTHEAST QUADRANT
045 NM SOUTHEAST QUADRANT
045 NM SOUTHWEST QUADRANT
045 NM NORTHWEST QUADRANT
REPEAT POSIT: 17.0N 107.2E

FORECASTS:
12 HRS, VALID AT:
251800Z — 17.1N 105.2E
MAX SUSTAINED WINDS – 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
VECTOR TO 24 HR POSIT: 265 DEG/ 09 KTS

24 HRS, VALID AT:
260600Z — 17.0N 103.3E
MAX SUSTAINED WINDS – 020 KT, GUSTS 030 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND

REMARKS:
250900Z POSITION NEAR 17.0N 106.7E.
TROPICAL STORM 08W (SONCA), LOCATED APPROXIMATELY 87 NM NORTHWEST
OF DA NANG, VIETNAM, HAS TRACKED WESTWARD AT 12 KNOTS OVER THE
PAST SIX HOURS. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE
JOINT TYPHOON WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY
MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT
AT 250600Z IS 12 FEET. REFER TO TYPHOON 07W (NORU) WARNINGS (WTPN31
PGTW)FOR SIX-HOURLY UPDATES. REFER TO TROPICAL STORM 09W (KULAP)
WARNINGS (WTPN33 PGTW)FOR SIX-HOURLY UPDATES.
//
NNNN

NW Pacific: TSR Storm Alert issued at 25 Jul, 2017 6:00 GMT

Tropical Storm SONCA is currently located near 17.0 N 107.2 E with maximum 1-min sustained winds of 40kts (46 mph). SONCA is forecast to affect land to the following likelihood(s) at the given lead time(s):

Yellow Alert Country(s) or Province(s)
    Vietnam
        probability for TS is 85% currently
    Laos
        probability for TS is 80% currently
Yellow Alert City(s) and Town(s)
    Dong Ha (16.8 N, 107.1 E)
        probability for TS is 85% currently
    Dong Hoi (17.5 N, 106.6 E)
        probability for TS is 70% currently

Note that
Yellow Alert (Elevated) is CAT 1 or above to between 10% and 30% probability, or TS to above 50% probability.
CAT 1 means Typhoon strength winds of at least 74 mph, 119 km/h or 64 knots 1-min sustained.
TS means Tropical Storm strength winds of at least 39 mph, 63 km/h or 34 knots 1-min sustained.

For graphical forecast information and further details please visit http://www.tropicalstormrisk.com/

(Image: TSR)

(Image: TSR)

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(Image: JMA)

WWJP25 RJTD 250600
WARNING AND SUMMARY 250600.
WARNING VALID 260600.
WARNING IS UPDATED EVERY 6 HOURS.
GALE WARNING.
SOUTHERLY TO SOUTHEASTERLY WINDS 30 TO 35 KNOTS PREVAILING OVER
WATERS BOUNDED BY 40N 147E 50N 152E 58N 152E 58N 172E 52N 170E 40N
151E 40N 147E.
WARNING.
DENSE FOG OBSERVED LOCALLY OVER SEA OF OKHOTSK SEA OF JAPAN BOHAI
YELLOW SEA EAST CHINA SEA.
WARNING.
DENSE FOG OBSERVED LOCALLY OVER WATERS BOUNDED BY 35N 139E 42N 141E
55N 162E 60N 164E 60N 180E 41N 180E 38N 165E 38N 150E 33N 142E 33N
139E 35N 139E.
SUMMARY.
LOW 1004 HPA AT 27N 139E NE SLOWLY.
LOW 996 HPA AT 49N 141E EAST SLOWLY.
LOW 996 HPA AT 55N 149E ENE 10 KT.
TROPICAL DEPRESSION 1002 HPA AT 13N 129E WNW SLOWLY.
HIGH 1006 HPA AT 24N 123E ALMOST STATIONARY.
HIGH 1032 HPA AT 47N 179E ALMOST STATIONARY.
STATIONARY FRONT FROM 36N 120E TO 37N 129E 37N 136E 38N 140E 39N 144E
46N 152E 50N 155E 52N 162E.
REMARKS.
TYPHOON 1705 NORU (1705) 970 HPA AT 25.9N 157.5E : SEE TROPICAL
CYCLONE WARNING.
TROPICAL STORM 1706 KULAP (1706) 1002 HPA AT 32.8N 155.0E : SEE
TROPICAL CYCLONE WARNING.
TROPICAL STORM 1708 SONCA (1708) 994 HPA AT 17.1N 107.7E : SEE
TROPICAL CYCLONE WARNING.

JAPAN METEOROLOGICAL AGENCY.=

 

METAREA11 / TYPHOON_WARNING_JAPAN / 250600

WTJP23 RJTD 250600
WARNING 250600.
WARNING VALID 260600.
WARNING IS UPDATED EVERY 6 HOURS.
GALE WARNING.
TROPICAL STORM 1708 SONCA (1708) 994 HPA
AT 17.1N 107.7E GULF OF TONGKING MOVING WEST 09 KNOTS.
POSITION FAIR.
MAX WINDS 35 KNOTS NEAR CENTER.
RADIUS OF OVER 30 KNOT WINDS 60 MILES.
FORECAST POSITION FOR 251800UTC AT 17.2N 105.5E WITH 40 MILES RADIUS
OF 70 PERCENT PROBABILITY CIRCLE.
1000 HPA.
BECOMING TROPICAL DEPRESSION.
FORECAST POSITION FOR 260600UTC AT 17.2N 103.0E WITH 60 MILES RADIUS
OF 70 PERCENT PROBABILITY CIRCLE.
1002 HPA.
BECOMING TROPICAL DEPRESSION.

JAPAN METEOROLOGICAL AGENCY.=

 

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