Manitoba News
Release
……………………………………………………
July
20, 2011
FLOOD BULLETIN #95
* An unstable weather system over
parts of Alberta, Saskatchewan, Manitoba and North Dakota is expected to produce
up to 20 millimetres of precipitation in some areas by Friday morning, with
localized cells bringing up to 100 mm over central Manitoba and up to 150 mm
over central Saskatchewan.
* Some areas of Manitoba have received
significant rainfall since midnight from the unstable weather system. Rainfall
received today as of 7 a.m. is shown in the chart below.
Rossburn 28.19
mm
St-Lazare 27.94 mm
Grandview 48.26 mm
Dauphin 33.02 mm
Fork River
34.8 mm
Russell 17 mm
Birtle 14.6 mm
* If the forecast storms do
occur in the next 24 hours, localized overland flooding may occur, with possible
significant water level rises on streams in areas already wet from previous
storms including Dauphin, The Pas and parts of the northern Interlake
region.
* Environment Canada has also issued a strong wind warning for
Lake Manitoba, Lake Winnipeg and Lake Winnipegosis as well as a squall warning
for Lake Manitoba.
* Provincial wind set-up alerts forecast for today
and tomorrow include:
A high wind set-up alert is issued for the east shore
and southeast corner of the south basin of Lake Manitoba. This includes
communities such as Twin Lakes Beach, St. Laurent and Lundar Beach.
A
moderate wind set-up alert is issued for the east shore of the north basin and
the Narrows and a portion of the south shore of Lake Manitoba, as well as the
east shores of Lake Winnipeg and the east and north shores of Oak Lake. This
includes communities such as Steeprock, Vogar, Delta Beach, Victoria Beach,
O’Hanly, Cherry Point and Oak Lake Beach.
The moderate wind set-up alert
for tomorrow does not include the north shores of Oak Lake.
* Winds on
Lake Manitoba are west at 37 km/h this afternoon and are forecast to increase to
56 km/h this evening, and change direction to northwest at 27 km/h tomorrow
evening. Winds on Friday are forecast to be northwest at 27 km/h and forecast
to change direction to east at 37 km/h in the afternoon.
* Winds on the
South Basin of Lake Winnipeg are light this afternoon, becoming southwest at 37
km/h later in the afternoon and forecast to increase to west at 56 km/h after
midnight where they will remain until decreasing to northwest at 37 km/h
tomorrow evening. Winds on Friday are forecast to be northeast at 27 km/h in
the morning, changing to east at 37 km/h in the afternoon.
* Winds on
Lake Winnipegosis are southwest at 18 km/h this afternoon, forecast to increase
to 37 km/h this evening and to continue to increase overnight to become west at
56 km/h tomorrow morning before decreasing a little to north at 37 km/h in the
evening. Winds are forecast to diminish to light on Friday.
* Wind
set-up alert maps are available on the Manitoba Water Stewardship Flood Response
webpage at www.manitoba.ca/flooding.
*
Due to the persistent hot, dry weather during the last several days, evaporation
losses on Lake Manitoba may be greater than considered in the forecast. Lake
Manitoba water levels may be near peak due to the greater evaporation losses if
the hot, dry weather continues, but may still rise as the combined inflow from
the Portage Diversion and the Waterhen River is still greater than the outflow
through the Fairford River. Heavy rainfall over the lake could also result in
some water level rise. Manitoba Water Stewardship continues to closely monitor
the conditions on the lake. Any change to the Lake Manitoba forecast will also
affect the forecasts for Lake Pineimuta and Lake St. Martin.
* The
Fairford River water control structure continues to operate at full capacity due
to the high level of Lake Manitoba.
* The Assiniboine River upstream of
the Portage Diversion is forecast to decline by about 500 cubic feet per second
(cfs) to 1,000 cfs per day for the next few days. It is currently expected the
diversion will remain in operation until the first week of August. Flows in the
diversion channel today are 11,840 cfs and the river downstream is at 16,960
cfs.
* The Souris River, the Saskatchewan River at The Pas and the Carrot
River continue to decline in Manitoba.
* Water levels on the Red River
continue to decrease and floodway operations ended on July 18. Manitoba Water
Stewardship will monitor future weather forecasts for extreme precipitation
events that may require operation of the floodway again until the Red River
reaches normal summer levels within Winnipeg.
* For more information, see
www.manitoba.ca/flooding. The most
up-to-date highway information is at www.gov.mb.ca/mit/roadinfo or
1-877-MBRoads (1-877-627-6237) and on Twitter by following @MBGov.
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