NASA Sees Ockhi’s Rain Reach India’s Western Coast

NASA’s Global Precipitation Measurement mission or GPM Core Observatory satellite passed over western India on December 5, 2017 at (12:21 a.m. EST) 0521 UTC and found that the remnants of former Tropical Cyclone Ockhi has reached the coast.

The GPM Core Observatory satellite passed over western India on Dec. 5, 2017 at (12:21 a.m. EST) 0521 UTC and showed storm top heights in the most powerful storms well to the southwest of the center reached altitudes of about 10 km (6.2 miles) where rainfall was occurring at over 101.6 mm (4 inches) per hour. Credit: NASA/JAXA, Hal Pierce

GPM’s Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) instruments showed precipitation from dissipating tropical cyclone. GPM’s radar (DPR Ku band) indicated that rain was falling at a rate of over 101.6 mm (4 inches) per hour in a few storms near India’s coast. Ockhi’s low level center of circulation was located well to the southwest of the storms that were moving onto India’s western coast. The displacement of the center from the precipitation indicates that strong vertical wind shear had pushed the storms away.

At NASA’s Goddard Space Flight Center in Greenbelt, Md. a 3-D view of Ockhi was constructed using GPM’s radar (DPR Ku Band) data. The 3-D radar slice through a few heavy storms near India’s western coast showed that intense showers in that area were returning strong radar reflectivity values. Storm top heights in the most powerful of these storms were found by DPR to reach altitudes of about 10 km (6.2 miles). GPM is a joint mission between NASA and the Japan Aerospace Exploration Agency, JAXA.

A few hours after this GPM pass the Joint Typhoon Warning Center (JTWC) issued it’s final warning on the dissipating tropical cyclone.

Source: NASA

Flood Summary

Last updated: December 4, 2017
Event
Cyclone Ockhi, Sri Lanka and India, November to December 2017
Date
November 29, 2017
Type
Flash flood
Cause
Extreme rainfall

Locations

A - Galle (Sri Lanka)
B - Kalutara (Sri Lanka)
C - Matara (Sri Lanka)
D - Monaragala (Sri Lanka)
E - Hambanthota (Sri Lanka)
F - Kandy (Sri Lanka)
G - Nuwaraeliya (Sri Lanka)
H - Rathnapura (Sri Lanka)
I - Badulla (Sri Lanka)
J - Gampaha (Sri Lanka)
K - Puttalam (Sri Lanka)
L - Kegalle (Sri Lanka)
M - Matale (Sri Lanka)
N - Kurunagala (Sri Lanka)
O - Colombo (Sri Lanka)
P - Anuradapura (Sri Lanka)
Q - Thiruvananthapuram, Kerala (India)
R - Kanyakumari, Tamil Nadu (India)
S - Minicoy Island, Lakshadweep, India (India)

Magnitude

Rainfall level
66 mm in 24 hours
Deraniyagala, Kegalle District, Sri Lanka - December 2 to December 3, 2017
Rainfall level
121 mm in 24 hours
Baddegama, Galle District, Sri Lanka - November 30 to December 1, 2017
Rainfall level
86.2 mm in 24 hours
Putupaula, Kalutara District, Sri Lanka - November 30 to December 1, 2017
Rainfall level
99.7 mm in 24 hours
Pitabeddara, Matara District, Sri Lanka - November 30 to December 1, 2017
Rainfall level
168.40 mm in 24 hours
Putupaula, Kalutara District, Sri Lanka - November 29 to November 30, 2017
Rainfall level
111.9 mm in 24 hours
Baddegama, Galle District, Sri Lanka - November 29 to November 30, 2017
River level
4.31 metres
Gin Ganga at Baddegama, Sri Lanka - December 3 to December 3, 2017
Major flood level is 5 m
River level
6.7 metres
Nilwala Ganga at Panadugama, Sri Lanka - December 2 to December 2, 2017
Major flood level 6.50 m
Rainfall level
107 mm in 24 hours
Nagapattinam, Tamil Nadu, India - December 3 to December 4, 2017
Rainfall level
195 mm in 24 hours
Nagapattinam, Tamil Nadu, India - December 2 to December 3, 2017
Rainfall level
158.1 mm in 24 hours
Pondicherry, India - December 1 to December 2, 2017
Rainfall level
119.5 mm in 24 hours
Kanyakumari, Tamil Nadu, India - December 1 to December 2, 2017
Rainfall level
169 mm in 24 hours
Minicoy, Lakshadweep, India - December 1 to December 2, 2017

Damages

Fatalities
13 people
Sri Lanka - November 29 to December 3, 2017
Galle (8), Matara (1), Badulla (3) and Gampaha (1)
Buildings destroyed
694 buildings
Sri Lanka - November 29 to December 3, 2017
423 of them in Kalutara, 155 in Galle, others in Matara, Badulla, Colombo and elsewhere.
Evacuated
5,435
Sri Lanka - November 29 to December 3, 2017
Evacuated
6,581
Kerala, India - December 2 to December 4, 2017
Buildings destroyed
63 buildings
Kerala, India - December 2 to December 4, 2017
Fatalities
19 people
Kerala, India - December 2 to December 4, 2017

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