Rainfall Warning Issued for Thunder Bay

A Colorado Low is tracking northward to Northwestern Ontario. The system has put Thunder Bay and region into a Rainfall Warning
A Colorado Low is tracking northward to Northwestern Ontario. The system has put Thunder Bay and region into a Rainfall Warning

Weather Radar Image at 20:00 on August 18 2015
Weather Radar Image at 20:00 on August 18 2015

THUNDER BAY – WEATHER – There is a rainfall warning in effect for Thunder Bay. The Colorado Low, tracking to the region is expected to produce significant and potentially heavy rainfall at times.

Rainfall warning in effect for:

  • City of Thunder Bay
  • Gull Bay – Black Sturgeon Lake

A developing Colorado low is forecast to strengthen and track over western lake Superior by Wednesday evening. Rain at times heavy is expected to begin overnight. Current indications suggest that rainfall amounts from this system are likely to be 40 to 50 mm by Wednesday evening. However, rainfall amounts could exceed 50 mm in some locales due to embedded thunderstorm.

Heavy downpours can cause flash floods and water pooling on roads.

Rainfall Warnings are issued when significant rainfall is expected.

The system has also put a rainfall warning in effect for much of Northwestern Ontario.

Special weather statement in effect for:

  • Dryden – Vermilion Bay
  • Ignace – English River
  • Sioux Lookout – Sandy Lake
  • Fort Frances – Rainy Lake
  • Nipigon – Red Rock
  • Manitowadge – Hornpayne
  • Geraldton – Lake Helen

Significant rainfall Wednesday.

A developing Colorado low is forecast to strengthen and track over Western Lake Superior by Wednesday evening. Rain in advance of this system is expected to begin along the Minnesota border overnight then spread northward to Lake Nipigon by early Wednesday morning.

Current indications suggest that rainfall amounts from this system are likely to be in the 25 to 40 mm range by Wednesday evening. However, rainfall amounts could reach 50 mm in some locales due to embedded thunderstorms.

The rain should become light Wednesday night before tapering off Thursday morning.