India/Bay of Bengal: Depression(IMD)/Tropical Cyclone 4B HELEN 192100Z nr 15.1N 83.9E, moving W at 7 knots (JTWC)

CYCLONIC STORM HELEN (RSMC NEW DELHI)

Tropical Cyclone 04B (HELEN)(JTWC)

Up to 10.1 million people people can be affected by wind speeds of tropical storm strength or above. In addition, 1.3 million people people are living in coastal areas below 5m and can therefore be affected by storm surge. - GDACS

“(Helen) forecast to make landfall as a Severe Cyclonic Storm with winds gusting up to 120kph. Or about the equivalent of Typhoon Strength Gust.” – Westernpacificweather

 

(Image: wunderground.com) 5 Day Forecast (Click image for source)

 

(Image: wunderground.com) Satellite (Click image for source)

TROPICAL CYCLONE ADVISORY
RSMC TROPICAL CYCLONES, NEW DELHI
TROPICAL STORM HELEN ADVISORY NO. TWO ISSUED AT 0900 UTC OF
20TH NOVEMBER 2013 BASED ON 0600UTC CHARTS of 20TH NOVEMBER 2013.

THE CYCLONIC STORM HELEN OVER WESTCENTRAL BAY OF BENGAL MOVED SLIGHTLY WEST-
NORTHWESTWARDS DURING PAST 6 HRS AND LAY CENTRED AT 0600 UTC OF TODAY, THE 20
TH
NOVEMBER 2013 NEAR LATITUDE 15.2
0
N AND LONGITUDE 84.0
0
E, ABOUT 470 KM EAST-
NORTHEAST OF CHENNAI (43279), 430 KM EAST OF KAVALI (43243), 320 KM EAST-SOUTHEAST
OF MACHILIPATNAM (43185) AND 290 KM SOUTH-SOUTHEAST OF VISHAKHAPATNAM (43149).
THE SYSTEM WOULD FURTHER INTENSIFY INTO A SEVERE CYCLONIC STORM DURING NEXT 24
HRS. IT WOULD MOVE WEST-NORTHWESTWARDS FOR SOME TIME, THEN WEST-
SOUTHWESTWARD AND CROSS SOUTH ANDHRA PRADESH COAST BETWEEN SRIHARIKOTA
(ANDHRA PRADESH) AND ONGOLE (43221), CLOSE TO KAVALI AROUND NIGHT OF 21
ST
NOVEMBER 2013.
ACCORDING TO SATELLITE IMAGERIES, THE INTENSITY OF THE SYSTEM IS T 2.5.
ASSOCIATED BROKEN LOW/MEDIUM CLOUD EMBEDDED WITH INTENSE TO VERY INTENSE
CONVECTION IS SEEN OVER BAY OF BENGAL BETWEEN LAT 13.5
0
N AND 18.0
0
N LONG 82.0
0
E AND
86.0
0
E. THE LOWEST CLOUD TOP TEMPERATURE (CTT) IS ABOUT -80
0
C.CONVECTIVE BANDING
IS MORE PRONOUNCED IN NORTHERN SECTOR OF THE SYSTEM. CONVECTION NEAR THE
CENTRE HAS ORGANISED AND CONSOLIDATED FURTHER DURING PAST 12 HOURS.
MAXIMUM SUSTAINED SURFACE WIND SPEED IS ESTIMATED TO BE ABOUT 40 KNOTS
GUSTING TO 50 KNOTS AROUND THE SYSTEM CENTRE.
THE STATE OF THE SEA IS HIGH
AROUND THE SYSTEM CENTRE. THE ESTIMATED CENTRAL PRESSURE IS ABOUT 1000 HPA.
T
RACK AND INTENSITY FORECASTS OF THE SYSTEM ARE GIVEN IN THE TABLE BELOW:
Date/Time(UTC)
Position
(Lat.
0
N/ long.
0
E)
Maximum sustained surface
wind speed (kmph)
Category
20
-11-2013/0600
15.2/84.0
70-80 GUSTING TO 90
CYCLONIC STORM
20
-11-2013/1200
15.4/83.5
75-85 GUSTING TO 95
CYCLONIC STORM
20
-11-2013/1800
15.4/83.0
85-95 GUSTING TO 105
CYCLONIC STORM
21
-11-2013/0000
15.2/82.5
90-100 GUSTING TO 110
SEVERE CYCLONIC STORM
21
-11-2013/0600
15.0/82.0
95-105 GUSTING TO 115
SEVERE CYCLONIC STORM
21
-11-2013/1800
14.8/80.8
100-110 GUSTING TO 120
SEVERE CYCLONIC STORM
22
-11-2013/0600
14.7/79.5
80-90 GUSTING TO 100
CYCLONIC STORM
22
-11-2013/1800
14.6/78.2
55-65 GUSTING TO 75
DEEP DEPRESSION
23-11-2013/060
0
14.5/77.0
40-50 GUSTING TO 60
DEPRESSION
REMARKS:
THE SYSTEM IS BEING MONITORED BY DWR- MACHILIPATNAM, VISAKHAPATNAM
AND CHENNAI. ACCORDING TO THESE RADARS, THE SYSTEM IS LOCATED NEAR 15.2N AND
84.0E AT 0600 UTC. THE BUOY OBSERVATIONS NEAR 13.5N AND 84.0E SHOW MSLP OF 1007.3
HPA AND WINDS OF 270/16 KTS.
THE CYCLONIC STORM HELEN LIES TO THE SOUTH OF THE UPPER TROPOSPHERIC
RIDGE WHICH RUNS ALONG 17
0
N. THE LOW LEVEL CONVERGENCE ALONGWITH LOW LEVEL
RELATIVE VORTICITY ARE FAVOURABLE FOR INTENSIFICATION AND THEY HAVE INCREASED
DURING PAST 12 HRS. THE SEA SURFACE TEMPERATURE IS ABOUT 28-29
0
C. THE VERTICAL
WIND SHEAR OF HORIZONTAL WIND IS LOW TO MODERATE (05-15 KNOTS).
DIVERGENCE IN NWP MODELS GUIDANCE CONTINUES WITH RESPECT TO LANDFALL
POINT AND TIME, AS THE TRACK FORECAST VARIES FROM WEST-SOUTHWEST TO NORTHWEST
DIRECTION. WITH RESPECT TO INTENSIFICATION, THERE IS MORE CONSENSUS SUGGESTING
SLOW INTENSIFICATION OR NO INTENSIFICATION. CURRENT FORECAST IS BASED ON
CONSENSUS NWP AND SYNOPTIC ANALYSIS.NSUS NWP AND SYNOPTIC ANALYSIS.

Joint Typhoon Warning Center (JTWC)

 

https://i2.wp.com/www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0413.gif

 

WTIO31 PGTW 200900

MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 04B (HELEN) WARNING NR 004//
RMKS/
1. TROPICAL CYCLONE 04B (HELEN) WARNING NR 004
01 ACTIVE TROPICAL CYCLONE IN NORTHIO
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY

WARNING POSITION:
200600Z — NEAR 15.3N 84.1E
MOVEMENT PAST SIX HOURS – 315 DEGREES AT 03 KTS
POSITION ACCURATE TO WITHIN 045 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS – 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS – 070 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
REPEAT POSIT: 15.3N 84.1E

FORECASTS:
12 HRS, VALID AT:
201800Z — 15.5N 83.6E
MAX SUSTAINED WINDS – 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS – 030 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS – 075 NM NORTHEAST QUADRANT
055 NM SOUTHEAST QUADRANT
055 NM SOUTHWEST QUADRANT
075 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 295 DEG/ 03 KTS

24 HRS, VALID AT:
210600Z — 15.7N 83.1E
MAX SUSTAINED WINDS – 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS – 030 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS – 075 NM NORTHEAST QUADRANT
055 NM SOUTHEAST QUADRANT
055 NM SOUTHWEST QUADRANT
075 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 280 DEG/ 02 KTS

36 HRS, VALID AT:
211800Z — 15.8N 82.6E
MAX SUSTAINED WINDS – 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS – 025 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS – 070 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 270 DEG/ 04 KTS

EXTENDED OUTLOOK:
48 HRS, VALID AT:
220600Z — 15.8N 81.8E
MAX SUSTAINED WINDS – 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS – 050 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 265 DEG/ 05 KTS

72 HRS, VALID AT:
230600Z — 15.7N 79.8E
MAX SUSTAINED WINDS – 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND

REMARKS:
200900Z POSITION NEAR 15.3N 84.0E.
TROPICAL CYCLONE 04B (HELEN), LOCATED APPROXIMATELY 501 NM SOUTH-
SOUTHWEST OF CALCUTTA, INDIA, HAS TRACKED NORTHWESTWARD AT 03
KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY DEPICTS MULTIPLE DEEP CONVECTIVE SPIRAL BANDS WRAPPING INTO
A WELL-DEFINED LOW-LEVEL CIRCULATION CENTER (LLCC). RECENT AMSU-B
PASSES (200409Z AND 200733Z) INDICATE DEEP CONVECTIVE STRUCTURE OVER
THE LLCC AND WITHIN THE MAIN FEEDER BAND TO THE NORTH. THE INITIAL
POSITION IS BASED ON THE AFOREMENTIONED MICROWAVE PASSES WITH FAIR
CONFIDENCE AND IS CLOSE TO THE PGTW CENTER FIX LOCATION. THE INITIAL
INTENSITY IS MAINTAINED AT 50 KNOTS BASED ON CONVECTIVE STRUCTURE
AND PERSISTENCE OF DVORAK ESTIMATES RANGING FROM 45-55 KNOTS FROM
PGTW AND KNES RESPECTIVELY. UPPER-LEVEL ANALYSIS INDICATES TC HELEN
IS LOCATED NEAR THE SUBTROPICAL RIDGE AXIS BUT VERTICAL WIND SHEAR
REMAINS MODERATE AT 15-20 KNOTS. DIVERGENCE IS CONTAINED IN THE
POLEWARD DIRECTION AS OUTFLOW INTO THE MID-LATITUDE WESTERLIES
PROVIDES THE LARGEST SOURCE OF EXHAUST. TC HELEN HAS MAINTAINED SLOW
TRACK SPEEDS DURING THE PAST 18 HOURS AS IT MEANDERS NORTHWESTWARDS
TOWARDS A WEAKNESS IN THE MID-LEVEL RIDGE. THESE SLOW TRACK SPEEDS
ARE FORECAST TO CONTINUE AS THE CYCLONE CONTINUES TO TRACK WITHIN
THE WEAKNESS. THE MID-LEVEL SUBTROPICAL RIDGE SHOULD GRADUALLY BUILD
IN FROM THE EAST AND STEER TC HELEN ON A MORE WESTWARDS TRACK AFTER
TAU 24. GRADUAL INTENSIFICATION TO 60 KNOTS BY TAU 24 IS EXPECTED AS
POLEWARD OUTFLOW BATTLES THE MODERATE VERTICAL WIND SHEAR. SEA
SURFACE TEMPERATURES WILL REMAIN FAVORABLE AT 26-28 DEGREES CELSIUS
BUT OCEAN HEAT CONTENT WILL DROP-OFF BY TAU 36 AND GRADUAL WEAKENING
WILL OCCUR THEREAFTER. THERE CONTINUES TO BE A BIFURCATION AMONGST
MODEL TRACKERS WITH THE WEAKER VORTEX CLUSTER (ECMF, NVGM, GFDN,
EGRR) TRACKING SOUTHWESTWARD AND THE STRONGER VORTEX CLUSTER (AVNO,
HWRF, CTCX) TRACKING NORTHWESTWARD AND THEN WESTWARD. THE CURRENT
FORECAST DIFFERS FROM PREVIOUS BASED ON LAST 18 HOUR PERSISTENCE OF
SLOW TRACK SPEEDS TO THE NORTHWEST. THEREFORE, THE TIMING OF THE
CURRENT FORECAST HAS SIGNIFICANTLY SLOWED DOWN FROM THE PREVIOUS
FORECAST. CURRENT FORECAST PHILOSOPHY NOW FAVORS THE TRACKERS THAT
DEPICT A STRONGER VORTEX AND SLOWER TRACK SPEEDS. DUE TO THE
UNCERTAINTY AND SPREAD IN MODEL TRACKERS, CONFIDENCE IN THE FORECAST
TRACK REMAINS LOW. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200600Z IS 15
FEET. NEXT WARNINGS AT 201500Z, 202100Z, 210300Z AND 210900Z.//
NNNN

 

TSR logoN Indian Ocean: Storm Alert issued at 20 Nov, 2013 6:00 GMT

 

 

Tropical Storm HELEN (04B) currently located near 15.3 N 84.1 E is forecast to strike land to the following likelihood(s) at the given lead time(s):

Yellow Alert Country(s) or Province(s)
India
probability for CAT 1 or above is 10% in about 36 hours
probability for TS is 55% in about 24 hours

 

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 Severe Cyclonic Storm 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/

 

https://i2.wp.com/old.gdacs.org/images/gdacs_logo_small.png

 

Automatic impact report for tropical cyclone HELEN-13

alertimage

Green alert for wind impact in India

This tropical cyclone is expected to have a low humanitarian impact based on the storm strength and the affected population in the past and forecasted path.

 

Current storm status

 

This report is for advisory number 4 of tropical cyclone HELEN-13 issued at 11/20/2013 6:00:00 AM (GDACS Event ID 41389, Latest episode ID: 4).

 

Current impact estimate:

 

  • Population affected by Category 1 (120 km/h) wind speeds or higher is 0
  • Tropical Storm (maximum wind speed of 111 km/h)
  • Vulnerability of affected countries: High

 

Impact of Extreme Wind

 

Cloud map
Cloud map. The map shows the areas affected by tropical storm strength winds (green), 58mph winds (orange) and cyclone wind strengths (red). (Source: JRC)

Affected population

Up to 10.1 million people people can be affected by wind speeds of tropical storm strength or above. In addition, 1.3 million people people are living in coastal areas below 5m and can therefore be affected by storm surge.

Affected provinces

Country Region/Province Population
India Andhra Pradesh 70.2 million people
India Pondicherry 850000 people

Affected cities

Name Region/Province Country City class Population
Kandukur Andhra Pradesh India City [unknown]
Bhimavaram Andhra Pradesh India City 130000 people
Narasapur Andhra Pradesh India City 59000 people
Gudivada Andhra Pradesh India City 7200 people
Guntur Andhra Pradesh India City 510000 people
Tenali Andhra Pradesh India City 150000 people
Narasaropet Andhra Pradesh India City [unknown]
Machilipatnam Andhra Pradesh India City 180000 people
Bapatla Andhra Pradesh India City 68000 people
Nizampatam Andhra Pradesh India City [unknown]
Chirala Andhra Pradesh India City 86000 people
Ongole Andhra Pradesh India City 170000 people
Kottapatnam Andhra Pradesh India City [unknown]

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

See complete report

 

WesternPacificWeather.com

“The western pacific may be quite but Cyclone Helen has now formed over the bay of Bengal. It is forecasted to make landfall as a severe Cyclonic storm with winds gusting up to 120kph. Or about the equivalent of Typhoon Strength Gust.” – Westernpacificweather

 

MARITIME

 

METAREA8N / HIGH_SEAS_WARNING / 0134

WTIN01 DEMS 200134
SHIPPING BULLETINE FOR MET. AREA VIII NORTH OF EQUATOR
VALID FOR 12 HRS FROM 0100 UTC OF 20-11-2013.
—————————————————————
THE DEPRESSION OVER WESTCENTRAL BAY OF BENGAL MOVED
NORTHWESTWARDS AND INTENSIFY INTO A DEEP DEPRESSION OVER
WESTCENTRAL BAY OF BENGAL IT FURTHER MOVED WESTWARD AND
LAY CENTRED AT 2330 HRS IST OF 19TH NOVEMBER 2013 NEAR
LATITUDE 15.0 N AND LONGITUDE 84.5 E(.)
THE SYSTEM WOULD FURTHER INTENSIFY INTO A CYCLONIC STORM
DURING NEXT 24 HRS. IT WOULD MOVE WEST-NORTHWESTWARDS FOR SOME
TIME, THEN WESTSOUTHWESTWARD (.)

ISSUED BY INDIA METEOROLOGICAL DEPARTMENT=

 

Indian Ocean Forecast System (INDOFOS)

High Wind-Wave Watch

 

Issue Date :18-11-2013 Region : Tamil Nadu

Comparisions of wave forecast with Observations : Pondicherry

High wind waves in the range of 2.5 – 3 meters are predicted during 02:30 hrs on 19-11-2013 to 23:30 hrs on 20-11-2013 along the Kolacahl to kilakarai of Southern Tamil Nadu.
images
Significant Wave Height

Tide Predictions

Kolachal

High Wind-Wave Alert

 

Issue Date :19/11/2013 Region : Andhra Pradesh

Comparisions of wave forecast with Observations : Vizag

Sea condition will be rough (Significant Wave Height between 2.5m 4.0m) off Andhra Pradesh coast (Nellore to Srikakulam) during 1730 hrs of 19-11-2013 To 2330 hrs of 21-11-2013. At the Amalapuram coast, the maximum waves (nearly 4 ) Would be experienced during 21-11-2013, 1730 hrs.

Rainfall at most places with isolated heavy to very heavy rainfall would occur over coastal Andhra Pradesh commencing from 20st November 2013 night.

Squally winds speed reaching 45-55 kmph gusting to 65 kmph would prevail along and off Andhra Pradesh coast commencing from 20th November 2013 night.

Fishermen are advised not to venture into Sea off Andhra Pradesh coast. Fishermen out at sea off Andhra Pradesh coasts are advised to return to the coast.

Tide Predictions

Vishakapatnam

High Wind-Wave Watch

 

Issue Date :18-11-2013 Region : Andaman

Comparisions of wave forecast with Observations : Portblair

High wind waves in the range of 2.5-3.0 meters are forecasted during 1730 hours on 18-11-2013 to 2330 hours of 19-11-2013 along the west coast of Andaman Islands between Ten Degree Channel to Coco Channel.

Tide Predictions

Port-Blair

High Wind-Wave Watch

 

Issue Date :18-11-2013 Region : Kerala

Comparisions of wave forecast with Observations : Kozhikode

High wind waves in the range of 2.5 3.0 meters are forecasted during 0230 hours on 19-11-2013 to 2330 hours of 20-11-2013 along the Kerala coast between Vilinjam to Kasargod.
images
Significant Wave Height

Tide Predictions

Vizhinjam

High Wind-Wave Watch

 

Issue Date :18-11-2013 Region : Lakshadweep

Comparisions of wave forecast with Observations : Agatti

High wind waves in the range of 2.5-3.0 meters are forecasted during 1730 hours on 18-11-2013 to 2330 hours of 19-11-2013 along Lakshadweep Islands between Minicoy to Bitra
images
Significant Wave Height

Tide Predictions

Minicoy

High Wind-Wave Watch

 

Issue Date :19/11/2013 Region : Tamil Nadu

Comparisions of wave forecast with Observations : Pondicherry

Sea condition will be rough (Significant Wave Height between 2.5m – 3.0m) off Puducheery aand Tamil Nadu coasts (Nagapattinam to Chennai) during 1730 hrs of 19-11-2013 to 2330 hrs of 21-11-2013.

Rainfall at most places with isolated heavy to very heavy rainfall would occur over north coastal Tamil Nadu commencing from 20st November 2013 night.

Squally winds speed reaching 45-55 kmph gusting to 65 kmph would prevail along and off North Tamil Nadu coast commencing from 20th November 2013 night.

Fishermen along and off north Tamil Nadu and Puducherry coast are advised to be cautious while going into sea.

Tide Predictions

Pondichery

High Wind-Wave Watch

 

Issue Date :18-11-2013 Region : Nicobar
High wind waves in the range of 2.5-3.0 meters are forecasted during 1730 hours on 18-11-2013 to 2330 hours of 19-11-2013 along the west coast of Nicobar Islands between Ten Degree Channel to Great Channel.

null

Tide Predictions

Car-Nicobar

images
AVHRR Image

 

 

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