New Zealand: Tropical Cyclone PAM 17P CAT3 151500Z POSITION nr 34.2S 178.8E, moving SE at 20 Kts (JTWC) – Updated 150315 1448z (GMT/UTC)

Tropical Cyclone 17P (PAM)

(Equivalent of a CATEGORY 3 Hurricane on the Saffir-Simpson Hurricane Wind Scale)

MAXIMUM SIGNIFICANT WAVE HEIGHT AT 151200Z IS 40 FEET – JTWC

(Image: wunderground.com) 5 day forecast

(Image: wunderground.com) 5 day forecast

sp201517_sat_anim Pam 15

(Image: wunderground.com) Satellite

New Zealand

Issued at 12:54am Monday 16 Mar 2015 (Local time)

UPDATE TROPICAL CYCLONE PAM

At midnight Sunday tropical cyclone Pam was situated about 450km to the northeast of Auckland and 450km to the north of East Cape. It has already brought 70mm or rain to parts of Gisborne and 140 to 150 kilometer an hour wind gusts to exposed parts of Auckland and Northland.

It is expected to lie about 150km east of East Cape (northern Gisborne)by midday Monday,then move away from the New Zealand coastline towards the Chatham Islands.Strong southeast winds and rain are expected over much of the North Island today, along with extremely large seas about the east coast.Wind gusts of 160 km/h or more are possible about the eastern Bay of Plenty and northern parts of Gisborne.Winds of this strength are likely to cause damage to trees and powerlines and could lift roofs and make for hazardous driving conditions.A burst of heavy rain accompanies these winds, with 180-220 mm possible about the Gisborne ranges.Please refer to the latest severe weather warnings and watches issued by MetService for more information. The total combined waves (sea and swell)generated by cyclone Pam are expected to rise to 7-8m around the northern New Zealand coastline and even up to 9m around the northern Gisborne coast.
For any further information go to: http://www.metservice.com/national/home
The next update to this blog will be around midnight Sunday 15 March.
For further information please contact:
Duty Meteorologist 044700815
+++++++++++++

Cyclone Pam – Latest update 1am Monday 16th March

HORDUR THORDARSON, METSERVICE METEOROLOGIST

Sunday 16 March 2015 1:00am

Category 3 Cyclone Pam was lying near 34S 178.5E at midnight, or about 450 kilometres northeast of Auckland and 450 kilometres north of East Cape on a track to the south-southeast as shown on the image below.

Track

The effects of Cyclone Pam are already being felt in some areas. A wind gust to 150 kilometres per hour was observed near Kaeo in Northland and a gust of 144 kilometres an hour was observed at Channel Island between Coromandel Peninsula and Great Barrier Island this evening. Rain is becoming heavy in Gisborne and and 70mm have already accumulated in some areas there.

Rain radar at 11pm Sunday
Rain radar at 11pm Sunday

Pam is expected to be reclassified early this morning and will from then on be considered an extra tropical cyclone.

Infra red image at 11pm Sunday
Infra red image at 11pm Sunday

Why will it be re classified? The reason for this is that the nature of the system changes. A tropical cyclone derives its energy from latent heat released in strong deep convection. Warm moist air over a warm sea surface rises, condenses, warms further and continues to rise. This is the energy that intensifies and maintains a tropical cyclone. Once the cyclone moves south out of the tropics and over cooler waters this energy source decreases. Normally this will lead to a slow weakening of the system.

There is however a new energy source that becomes available to the storm as it moves out of the tropics. This energy comes from the difference between hot and cold air. If there is a large temperature difference over a relatively short distance this can be a powerful source of energy that re-energises the storm as it moves out of the tropics.

The main differences between a tropical cyclone and an extra tropical cyclone are:

Tropical Cyclone                                                Extra tropical cyclone

No fronts                                                             Fronts

Winds max close the centre                           Wind maximum well away front the centre

Driven by latent heat release                         Strong temperature gradients

Reclassification does not mean that “Pam” no longer poses any threat. Extremely strong wind gusts, heavy rain and phenomenal waves are still expected, and details can be found in http://www.metservice.com/warnings/home as well as in http://blog.metservice.com/ or http://www.metservice.com/national/home

Joint Typhoon Warning Center (JTWC)

sh1715 pam 15

https://i1.wp.com/www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/satshots/17P_151132sair.jpg

WTPS31 PGTW 151500

MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 17P (PAM) WARNING NR 022//
RMKS/
1. TROPICAL CYCLONE 17P (PAM) WARNING NR 022
02 ACTIVE TROPICAL CYCLONES IN SOUTHPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY

WARNING POSITION:
151200Z — NEAR 33.3S 178.3E
MOVEMENT PAST SIX HOURS – 140 DEGREES AT 20 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS – 065 KT, GUSTS 080 KT
WIND RADII VALID OVER OPEN WATER ONLY
BECOMING EXTRATROPICAL
RADIUS OF 050 KT WINDS – 085 NM NORTHEAST QUADRANT
085 NM SOUTHEAST QUADRANT
065 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS – 160 NM NORTHEAST QUADRANT
160 NM SOUTHEAST QUADRANT
140 NM SOUTHWEST QUADRANT
140 NM NORTHWEST QUADRANT
REPEAT POSIT: 33.3S 178.3E

FORECASTS:
12 HRS, VALID AT:
160000Z — 37.0S 179.9W
MAX SUSTAINED WINDS – 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
EXTRATROPICAL

REMARKS:
151500Z POSITION NEAR 34.2S 178.8E.
TROPICAL CYCLONE 17P (PAM), LOCATED APPROXIMATELY 572 NM EAST-
SOUTHEAST OF KINGSTON IS., HAS TRACKED SOUTHEASTWARD AT 20 KNOTS
OVER THE PAST SIX HOURS. ANIMATED ENHANCED IR SATELLITE IMAGERY
DEPICTS RAPIDLY DECAYING DEEP CONVECTION WITH A PARTIALLY EXPOSED
LOW-LEVEL CIRCULATION CENTER AND LIMITED CORE CONVECTION, WITH THE
MAJORITY OF THE CONVECTION ON THE EASTERN SIDE. THIS IS CONFIRMED
WITH A 151246Z GPM IMAGE WHICH SHOWS THE SYSTEM TAKING ON FRONTAL
CHARACTERISTICS. THE SYSTEM IS EXPECTED TO COMPLETE EXTRA-TROPICAL
TRANSITION BY TAU 12 AS IT BECOMES FULLY ENVELOPED IN THE BAROCLINIC
ZONE. THERE IS HIGH CONFIDENCE IN THE JTWC FORECAST BASED ON THE
TIGHT AGREEMENT OF DYNAMIC MODELS. 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 151200Z IS 40 FEET. REFER TO TROPICAL CYCLONE 18P
(NATHAN) WARNINGS (WTPS32 PGTW) FOR TWELVE-HOURLY UPDATES.//
NNNN

TSR logoSW Pacific: Storm Alert issued at 15 Mar, 2015 12:00 GMT (Final Warning)

Tropical Cyclone PAM (17P) currently located near 33.3 S 178.3 E is forecast to strike land to the following likelihood(s) at the given lead time(s):

Yellow Alert Country(s) or Province(s)
    New Zealand
        probability for TS is 85% within 12 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 Tropical Cyclone 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/

201517P pam 15

MARITIME/ SHIPPING

HURRICANE WARNING

ZCZC 387
WHNZ41 NZKL 150626
HURRICANE WARNING 246
THIS AFFECTS OCEAN AREAS: SUBTROPIC AND FORTIES
TROPICAL CYCLONE PAM 950HPA] CENTRE WAS LOCATED NEAR 32.0 SOUTH 177.
4 EAST AT 150600 UTC.
POSITION POOR.
REPEAT POSITION 32.0S 177.4E AT 150600 UTC.
CYCLONE IS MOVING SOUTHEAST 30 KNOTS.
EXPECT SUSTAINED WINDS OF 80 KNOTS CLOSE TO THE CENTRE EASING TO 70
KNOTS BY 151800 UTC AND THEN EASING TO 50 KNOTS BY 160600 UTC.
PHENOMENAL SEA EASING TO HIGH TO VERY HIGH SEA AND MODERATE TO HEAVY
SWELL.
EXPECT WINDS OVER 63 KNOTS WITHIN 120 NAUTICAL MILES OF CENTRE IN
THE EASTERN SEMICIRCLE AND WITHIN 60 NAUTICAL MILES OF CENTRE IN THE
WESTERN SEMICIRCLE.
EXPECT WINDS OVER 47 KNOTS WITHIN 180 NAUTICAL MILES OF CENTRE IN
THE EASTERN SEMICIRCLE AND WITHIN 60 NAUTICAL MILES OF CENTRE IN THE
WESTERN SEMICIRCLE.
EXPECT WINDS OVER 33 KNOTS WITHIN 320 NAUTICAL MILES OF CENTRE IN
THE EASTERN SEMICIRCLE AND WITHIN 280 NAUTICAL MILES OF CENTRE IN
THE WESTERN SEMICIRCLE WITH VERY ROUGH SEA AND MODERATE TO HEAVY
SWELL.
FORECAST POSITION NEAR 35.6S 179.9E AT 151800 UTC
AND NEAR 38.4S 177.6W AT 160600 UTC.
THIS WARNING CANCELS AND REPLACES WARNING 243.

NNNN

.Further warnings here:

METAREA X

METAREA XIV

PassageWeather is a FREE sailing weather website: http://www.passageweather.com/

Do not use any information on this site for life or death decisions. All information is intended as supplementary to official sources. Kindly refer to your country’s official weather agency/government website for local warnings, advisories and bulletins.

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