Heavy rainfall warning and high streamflow advisory

The District of Squamish is actively preparing for the incoming weather event. The Department of Operations is monitoring the dikes and water levels, preparing pumps, as well as stockpiling resources for any localized flooding that may occur. Sandbags are available at the Public Works yard and sand is available up on the entrance to the dike behind the Works yard for those that may be concerned with localized flooding. We will continue to update our communications channels with any new information that becomes available throughout the storm cycle.

Issued by Environment Canada: 5:19 a.m. PST, Monday, December 8

"Rainfall warning in effect for: Howe Sound - Heavy rain is expected.

An incredible series of storms are set to cross the BC Coast this week. An intense jet stream over the Pacific is gathering very warm moist air from southern latitudes. A subtropically-influenced airstream will bombard the mountains of Vancouver Island and the Lower Mainland from today through Thursday morning.

The first two storms will boost rainfall totals well above the warning criteria for a 24-hour period. Following systems will add to the week's rainfall and the initial warnings will likely be extended for successive 24-hour periods though mid-week. The inflooding warm air will drive the freezing level to nearly 2500 metres. In some areas, additional water from snow-melt will add even more water to drainage basins, creeks, and rivers.

The West Coast of Vancouver Island, Inland areas including Port Alberni and Howe Sound will absorb the brunt of the saturated airstream. Rainfall totals in the range of 100 to 200 millimetres are expected through Tuesday morning, And that will be just the beginning...

Heavy downpours are likely to cause flash floods and water pooling on roads. Don't approach washouts near rivers, creeks and culverts.

Rainfall Warnings are issued when significant rainfall is expected.

Environment Canada meteorologists will update alerts as required. Please monitor local media or Weatheradio. Email reports of severe weather to pacificstorm@ec.gc.ca or tweet with the hashtag #BCStorm."


Issued by BC River Forecase Centre: High streamflow advisory for the south coast.

A High Streamflow Advisory has been issued for the South Coast, including Howe Sound.  Rivers are expected to rise in response rainfall overnight on Monday, with rapid rises in levels expected into late Tuesday. In areas where rainfall is the heaviest, it is likely that advisories will be upgraded to Flood Watch level. This includes the North Shore Mountains and Howe Sound and may extend to other areas. Read the full release.

A High Streamflow Advisory means that river levels are rising or expected to rise rapidly, but that no major flooding is expected. Minor flooding in low-lying areas is possible.

December 8, 2014

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