2006 Atlantic Hurricane Season Review
During the early 2006 hurricane season, predictions of an active hurricane season raised considerable anxiety for most countries in the typical threat areas.
The 2006 Atlantic hurricane season was quiet compared to the historic 2005 season -when almost every record was broken. However, it wasn't quiet compared to the average over the last decade. The 2006 hurricane season appeared less active because compared to 2005 there were about one-third of the storms, and no storms made landfall in the U.S.A.; compared to the long term average - 2006 wasn't a quiet hurricane season.
2006 hurricane season summary:
When the season ended in early October 2006 after the last named storm dissipated, it was a "normal" year when we consider the long-term averages through the period 1951-2000.
Hurricane activity was much quieter than predicted because an unexpected El Niño, an episode of warmer-than-normal sea temperatures in the eastern equatorial Pacific, that dominated through the height of hurricane development months.
Six of the ten named storms entered the CHC's response zone. Five of the storms directly impacted on Newfoundland or Nova Scotia (see map). The worst tropical cyclone of the year for Canada was Hurricane Florence in September which brought wind gusts in excess of 160 km/h and destroyed a house in the Newfoundland community of François.
2006 CHC warnings issued:
Alberto (June 10-16) Track Map
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 the 14th. Alberto deepened into a powerful post-tropical storm as it passed south of Nova Scotia late on the 15th and then through Newfoundland on the 16th. Maximum sustained / peak marine winds observed by a Canadian NOMAD weather buoy on the afternoon of the 15th were 46 knots (85 km/h) / 60 knots (111 km/h), respectively. The maximum sustained / peak winds over land were from Nova Scotia on the 15th where 45 knots (83 km/h) / 64 knots (119 km/h) were reported. There were some trees damaged and local power outages in Nova Scotia. The Atlantic Storm Prediction Centre (ASPC) issued marine storm and gale warnings. The CHC issued 15 information statements.
Unnamed Storm (July 17-18) Track Map
A tropical cyclone formed in the southwest quadrant of the RZ overnight on July 16th 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 the 17th with maximum sustained / peak wind reports from the buoy network of 31 knots (56 km/h) / 38 knots (70 km/h) respectively, on the 18th, although by this time the storm was already losing tropical characteristics. The storm weakened below gale strength before passing through Newfoundland late on the 18th. No significant impacts were reported. The ASPC issued marine gale warnings. The CHC coordinated messaging with the ASPC but did not issue any bulletins.
Beryl (July 18-July 23) Track Map
Tropical Storm Beryl entered the RZ late on July 19th, entered southwestern Canadian waters on the morning of the 21st as it underwent ET, and made landfall in southwestern Nova Scotia as a post-tropical storm in the afternoon of the 21st. Peak winds in excess of 43 knots (80 km/h) were reported around Nova Scotia on the 21st, with the maximum being 52 knots (96 km/h). Rainfall amounts in Nova Scotia were generally 25-50 mm (1-2 in.). The maximum official rainfall was 71 mm (2.8 in.) with an unofficial total of 88 mm (3.5 in.). Heaviest rain rates were 25 mm (1 in.) 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.
Florence (September 3-14) Track Map
Hurricane Florence entered the RZ just after midnight on the morning of September 12th. It was a large hurricane that was undergoing ET and completed transition prior to entering southeastern Canadian waters on the evening of the 12th. Post-tropical Florence intensified slightly and maintained hurricane force winds as it passed within 10-20 n.miles (19-37 km) of southeastern Newfoundland. Peak wind gusts reported from Newfoundland on September 13th 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 (1.2-2.0 in.) of rain with a maximum official report of 58.8 mm (2.3 in.) and an unofficial report of 67 mm (2.6 in.). 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.
Isaac (September 27-October 3) Track Map
Isaac entered the CHC RZ on the evening of Oct 1st as a hurricane but weakened to a tropical storm as it entered southeastern Canadian waters on the morning of the 2nd. Isaac remained tropical as it passed within 45 km of Cape Race Newfoundland late in the afternoon of the 2nd, following which it underwent rapid ET. On October 2nd maximum sustained / peak winds reported over Newfoundland were 40 knots (74 km/h) / 52 knots (96 km/h) while an offshore buoy reported maximum sustained / peak winds of 44 knots (82 km/h) / 56 knots (104 km/h). The rapidly moving storm only generated a maximum of 26 mm (1 in.) 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.
Tropical Storm Ernesto moved into North Carolina on September 1st and tracked up through southeastern Ontario on September 3rd as a weak dissipating extratropical cyclone. Maximum rainfall in Ontario was 54 mm (2.1 in.). 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.