South Coast: Synopsis
Technical Marine SynopsisIssued 8:00 PM NDT 28 August 2014 Tonight and Friday At 8:00 p.m. NDT tonight Hurricane Cristobal 973 mb located at
By 3:30 p.m. NDT Friday Hurricane Cristobal 971 mb located at
At 8:00 p.m. NDT tonight trough located over the South Coast
By 3:30 p.m. NDT Friday merging trough located on a line
northeast-southwest over the northern Grand Banks.
Marine Weather StatementIssued 7:58 PM NDT 28 August 2014 At 8:00 PM NDT hurricane Cristobal was located near 39.0 north, 61.5
west or about 380 nautical miles south-southeast of Halifax.
The maximum sustained winds are estimated at 70 knots and the central
pressure at 973 MB. Cristobal is moving northeast at 31 knots and is
expected to continue accelerating northeastward tonight. The current
forecast track takes Cristobal across the Southeastern Grand Banks as
a marginal hurricane on Friday.
Meanwhile, a trough of low pressure stretching across the South Coast
of Newfoundland and back to the Maritimes will remain
quasi-stationary tonight before moving southeastwards and getting
absorbed by hurricane Cristobal on Friday. North of this trough, gale
force northeasterlies will develop over the Southwest Coast overnight
and spread eastward Friday morning. Closer to the track of hurricane
Cristobal, storm to hurricane force winds can be expected on Friday.
Marine interests are advised that hurricane force wind warnings are
in effect for the Southeastern Grand Banks and Southwestern Grand
Banks - southeastern half. A storm warning is in effect for Northern
Grand Banks - southeastern half. Gale warnings are in effect for
Southwest Coast, South Coast, East Coast, Northern Grand Banks -
northwestern half, and Southwestern Grand Banks - northwestern half.
With the passage of hurricane Cristobal well offshore of
Newfoundland, its rapid forward speed of travel over the Southern
Grand Banks may trigger rapid tide-like changes in harbour water
levels over Eastern Newfoundland. The most probable period for this
would be tomorrow afternoon or early evening, and areas most prone to
this range from the Southern Avalon to the Bonavista Peninsula.
Tropical storms that have raced across the Grand Banks (moving over
100 km/h) in the past have caused water levels in harbours to rise
and fall 2 or 3 times over the span of an hour and fluctuate by as
much as 2 or 3 metres (6 to 10 feet).
This is an advisory that this may - repeat may - occur and interests
along the coast should be on the watch for this possibility from late
morning to early evening. Predicting the actual water level changes
for various harbours is very difficult. The high (natural) tide in
the region will be in the 10:30 to 11:30 AM time frame and will be
low in the 4:30 to 5:30 PM timeframe. If this does occur in the
afternoon then there could be issues with very low water levels.
If the storm accelrates significantly more than forecast then water
levels could be high enough to pose some issues. These storms have
been known to accelerate even more rapidly than forecast.
Marine interests are also advised to monitor the latest forecasts
from the Canadian Hurricane Centre and the Newfoundland and Labrador
weather office for updates on the Progress of Cristobal and its
impacts on Newfoundland marine waters.
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