Canadian Tropical Cyclone Season Summary for 2006
Prepared by: Peter Bowyer
Six tropical cyclones or their remnants entered the Canadian Hurricane Centre (CHC) Response Zone (RZ) in 2006.
2006 Storm Tracks Image
Of these storms, three remained offshore over Canadian waters (Florence as a hurricane, Isaac as a tropical storm, and an unnamed tropical storm), and three moved inland in their post-tropical stage (Alberto, Beryl, and Ernesto). Florence was the most destructive tropical cyclone of the season for eastern Canada. No Canadian fatalities were attributed to any tropical cyclone in 2006. Tropical storm warnings were issued for Nova Scotia for Tropical Storm Beryl and for Newfoundland for Hurricane Florence and Tropical Storm Isaac. The CHC issued a total of 93 information statements.
|Hurricane Information Statements|
|Number of Storms Represented by these Bulletins|
Alberto (June 10–16)
Tropical Storm Alberto weakened June 13–14 as it went through the Carolinas but then underwent rapid extratropical transition (ET) while entering the RZ well east of Maryland late on June 14. Alberto deepened into a powerful post-tropical storm as it passed south of Nova Scotia late on June 15 and then through Newfoundland on June 16. Maximum sustained and peak marine winds observed by a Canadian NOMAD weather buoy on the afternoon of June 15 were 46 knots (85 km/h) and 60 knots (111 km/h), respectively. The maximum sustained and peak winds over land were from Nova Scotia on June 15, where 45 knots (83 km/h) and 64 knots (119 km/h) were reported, respectively. Some trees were damaged and there were local power outages in Nova Scotia. The Atlantic Storm Prediction Centre (ASPC) issued marine storm and gale warnings. The CHC issued 15 information statements.
Alberto Storm Track Image
Unnamed Storm (July 17–18)
A tropical cyclone formed in the southwest quadrant of the RZ overnight on July 16 after a weak extratropical low moved over warm water, developed deep convection, and became a tropical depression. The cyclone strengthened into a tropical storm as it entered Canadian waters early on July 17, with maximum sustained and peak wind reports from the buoy network of 31 knots (56 km/h) and 38 knots (70 km/h), respectively, on July 18, although by this time the storm was already losing tropical characteristics. The storm weakened below gale strength before passing through Newfoundland late on July 18. No significant impacts were reported. The ASPC issued marine gale warnings. The CHC coordinated messaging with the ASPC but did not issue any bulletins.
Unnamed Storm Track Image
Beryl (July 18–July 23)
Tropical Storm Beryl entered the RZ late on July 19, entered southwestern Canadian waters on the morning of July 21 as it underwent ET, and made landfall in southwestern Nova Scotia as a post‑tropical storm in the afternoon of July 21. Peak winds in excess of 43 knots (80 km/h) were reported around Nova Scotia on July 21, with the maximum being 52 knots (96 km/h). Rainfall amounts in Nova Scotia were generally 25–50 mm. The maximum official rainfall was 71 mm, with an unofficial total of 88 mm. Heaviest rain rates were 25 mm in one hour. Impacts included localized stream overflows onto roadways, and broken tree limbs resulting in local power outages in the capital city of Halifax. The ASPC issued marine gale warnings and inland rain warnings. The CHC issued tropical storm warnings for Nova Scotia and 23 information statements.
Beryl Storm Track Image
Hurricane Florence entered the RZ just after midnight on the morning of September 12. It was a large hurricane that was undergoing ET and completed transition prior to entering southeastern Canadian waters on the evening of September 12. Post-tropical Florence intensified slightly and maintained hurricane force winds as it passed within 10–20 nautical miles (19–37 km) of southeastern Newfoundland. Peak wind gusts reported from Newfoundland on September 13 include 88 knots (163 km/h) at Sagona Island, 72 knots (133 km/h) at St. Lawrence, and 69 knots (128 km/h) at St. Pierre (not known for reporting high winds). Peak marine winds of 67 knots (124 km/h) were reported by a buoy in southeastern Maritime waters, while the highest waves were reported by buoys in the Grand Banks (9.8 m significant waves and 18.7 m maximum waves). Southeastern Newfoundland received 30–50 mm of rain, with a maximum official report of 58.8 mm and an unofficial report of 67 mm. Impacts include a house that was destroyed in the community of Francois, road washouts from coastal waves, power blackouts in portions of southeastern Newfoundland, a couple of grounded boats, fallen trees and some damaged roofs. The ASPC issued marine storm and gale warnings and inland wind and rain warnings. The CHC issued tropical storm warnings for Newfoundland and 27 information statements.
Florence Storm Track Image
Isaac (September 27–October 3)
Isaac entered the CHC RZ on the evening of October 1 as a hurricane but weakened to a tropical storm as it entered southeastern Canadian waters on the morning of October 2. Isaac remained tropical as it passed within 45 km of Cape Race, Newfoundland, late in the afternoon of October 2, following which it underwent rapid ET. On October 2, maximum sustained winds of 40 knots (74 km/h) and peak winds of 52 knots (96 km/h) were reported over Newfoundland, while an offshore buoy reported maximum sustained winds of 44 knots (82 km/h) and peak winds of 56 knots (104 km/h). The rapidly moving storm only generated a maximum of 26 mm of rain over extreme southeastern Newfoundland. No significant impacts were reported. The ASPC issued marine gale warnings. The CHC issued tropical storm warnings for Newfoundland and 21 information statements.
Isaac Storm Track Image
Tropical Storm Ernesto moved into North Carolina on September 1 and tracked up through southeastern Ontario on September 3 as a weak dissipating extratropical cyclone. Maximum rainfall in Ontario was 54 mm. The CHC coordinated messaging with the Ontario Storm Prediction Centre but did not issue any bulletins.
Hurricane Helene remained outside of the RZ with no impacts on Canada, although the CHC did issue 7 pre-emptive bulletins on September 20–21.
In late October an extratropical cyclone persisted in the northern Pacific. The storm drifted over anomalously warm water and developed central convection, eventually developing a clear eye and eyewall. The system dissipated in early November, but not before bringing very heavy rains to portions of Vancouver Island. It was never officially declared to be a tropical cyclone.
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