ATL: IGOR - Ex Hurricane - Discussion

[artist]

Guys, im glad to say that we survived! I went out and had look this morning but i forgot my camera. There wasnt really much to see except alot of trees and a few electricity poles down. Some people told me there was some damage to the causeway but no way near as much as when we saw fabian. The most strikng thing i noticed is that when I went to the beach on the south shore it was about 8ft lower that what it was before the storm! I really couldnt believe how much sand was taken away. I'll be going back out later so i'll be sure to grab a few pics. I was one of the lucky ones that didnt lose power last night but everyone appears to be ok. Just very minor damage. Really guys, thanks for your concerns.

so glad to see you check in Jahja and know you are ok! I will look forward to your pictures.

Giving a big sigh of relief here. Now to hear how plasticups family faired. He did mention last night their home is tucked safely away there, so from the sounds of it they are hopefully ok as well.

[HURAKAN]

HURRICANE IGOR ADVISORY NUMBER 51
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL112010
500 PM AST MON SEP 20 2010

...IGOR BEGINNING EXTRATROPICAL TRANSITION...ACCELERATING
NORTHEASTWARD TOWARD NEWFOUNDLAND...


SUMMARY OF 500 PM AST...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...38.2N 61.5W
ABOUT 725 MI...1170 KM SW OF CAPE RACE NEWFOUNDLAND
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/HR
PRESENT MOVEMENT...NE OR 40 DEGREES AT 28 MPH...44 KM/HR
MINIMUM CENTRAL PRESSURE...968 MB...28.59 INCHES

[HURAKAN]

HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 85 MILES...140 KM...FROM
THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 380
MILES...610 KM.

a diameter of 760 miles ... that makes Igor the largest ever, I think

[Terry]

From the CBC:

Igor to pound N.S., N.L. with rain

Environment Canada issued weather warnings Monday about Hurricane Igor, which is losing strength as it moves north but still expected to bring powerful winds and heavy rainfall to two provinces.

Igor is expected to cause hazardous conditions for mariners and coastal villages in both Newfoundland and Nova Scotia, with swells expected to reach two to three metres as Igor pushes north.

A tropical storm watch was issued for Newfoundland's Avalon and Burin peninsulas, where at least 100 millimetres of rain are expected to start falling Monday night.

"There could also be pockets that may exceed 150 mm on the Avalon Peninsula," Ian Khan, a meteorologist with the Halifax-based Atlantic Storm Prediction Centre, told CBC News.

Khan said winds would be heaviest offshore.

Some offshore oil rigs east of St. John's were being evacuated Monday before high winds and heavy rain that were expected to hit the following day.

Both helicopters and supply boats were used to evacuate the GSF Grand Banks and the Henry Goodrich rigs, both drilling rigs used to explore for oil.

About half of the employees on the oil production vessel at the White Rose field were expected to travel to St. John's before the storm.

Suncor officials said it would be business as usual at its production vessel at the Terra Nova oil field, where its ship would stay fully staffed. Suncor said the Terra Nova vessel is designed for the weather Igor is expected to bring to Atlantic Canada.

Weather forecasters predicted that Igor would be downgraded to a tropical storm by Tuesday.

Hibernia also wasn't taking any extraordinary measures at its concrete oil-drilling platform.

The company said it was monitoring Igor, but didn't think it looked like the storm would be severe enough to cause trouble.

The hurricane swept past Bermuda on Sunday night, knocking boats from their moorings and littering the tiny British territory with downed trees and branches.

[abajan]

HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 85 MILES...140 KM...FROM
THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 380
MILES...610 KM.

a diameter of 760 miles ... that makes Igor the largest ever, I think

If the winds were to extend 380 miles out in all quadrants, a diameter of 760 miles would be correct but I think the real diameter of tropical storm force winds is probably much less.

[Stephanie]

Guys, im glad to say that we survived! I went out and had look this morning but i forgot my camera. There wasnt really much to see except alot of trees and a few electricity poles down. Some people told me there was some damage to the causeway but no way near as much as when we saw fabian. The most strikng thing i noticed is that when I went to the beach on the south shore it was about 8ft lower that what it was before the storm! I really couldnt believe how much sand was taken away. I'll be going back out later so i'll be sure to grab a few pics. I was one of the lucky ones that didnt lose power last night but everyone appears to be ok. Just very minor damage. Really guys, thanks for your concerns.

That's a relief! I know that with the Nor'easters we have here on the East Coast, we tend to find beaches missing a relocated as well. Eight feet is amazing! I'm just glad that Igor wasn't the powerhouse he once was when he came to visit all of you.

[cwachal]

Here lets transfer the diameters of each wind quadrant into miles

Max Hurricane Force winds: 155 Miles
Max 50 knt winds: 334 miles
Max TS/Gale winds: 724 miles
Max 12 foot seas: 1,669 miles

I converted the highest Nautical Mile diameter into miles for everyone to see here

[Chacor]

As abajan said, wnds and seas vary in all four quadrants, so simply taking the largest extent and multiplying by two produces a skewed result.

And wow, just how often do you see MeteoFrance having to issue warnings for St-Pierre-et-Miquelon?!

[Chacor]

Can't remember that ever being mentioned officially in any NHC advisory...

[CrazyC83]

Can't remember that ever being mentioned officially in any NHC advisory...

There were never warnings for St-Pierre and Miquelon in Earl as he remained farther to the west. I don't think they issued warnings until this season, since Hurricane Warnings were warranted with Bill last year but nothing was issued for them.

[supercane]

You and Chacor are right; I misremembered. Post removed.

[littlevince]

Tenacious storm, still firing thunderstorms near the center

[cwachal]

Looks like Igor will stay tropical a little longer

[plasticup]

HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 85 MILES...140 KM...FROM
THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 380
MILES...610 KM.

a diameter of 760 miles ... that makes Igor the largest ever, I think

If the winds were to extend 380 miles out in all quadrants, a diameter of 760 miles would be correct but I think the real diameter of tropical storm force winds is probably much less.

The wind field looks reasonably symmetrical here:

[brunota2003]

Well, I believe the 11 am advisory will be the last for Igor. Adios!

[Macrocane]

It's very interesting to sea a post tropical/extra tropical hurricane on the forecast maps isn't it?

[jconsor]

Sustained hurricane or near-hurricane force winds have already been reported in south-central Newfoundland and at oil rigs and buoys south and SE of Newfoundland.

Canadian airports and buoys report sustained winds as 10-minute averages. I converted them to a 1-minute avg by multiplying by 1.14:

St. Pierre (south-central Newfoundland) - sustained 56 kt, gust to 74 kt
Sagona Island (south-central Newfoundland, elev. ~200 ft) - sustained 67 kt, gust to 75 kt
Buoy 44140 - sustained 60 kt, gust to 70 kt
Buoy 44139 - sustained 62 kt, gust to 74 kt
Buoy 44144 - sustained 58 kt, gust to 64 kt

Oil rig at 46N 49W - sustained 69 kt (not sure if this is a 1-minute or 10-minute avg.)
Oil rig at 47N 45.5W - sustained 58 kt (not sure if this is a 1-minute or 10-minute avg.)

Buoy 44251 - lowest pressure so far 958 mb
Buoy 44138 - lowest pressure 957 mb (may have been lower in between hourly reports)

[CrazyC83]

Based on that data, the intensity is probably up to 80 kt if those are 10-min and 70 kt if those are 1-min. I'd say the pressure is 954mb.

[CrazyC83]

It's very interesting to sea a post tropical/extra tropical hurricane on the forecast maps isn't it?

It's not all that uncommon. What would be bizarre would be to see an M under a white circle (a post-tropical storm with Cat 3+ winds I can't recall ever seeing though).

[Terry]

BuoyWeather.com

Newfoundland Marine Forecast today for 46.0ºN/52.5ºW

Hazardous conditions. Use extreme caution

Morning

Gale warning with dangerous seas. Small craft advisory. Use extreme caution. Very large short period wind waves.
Winds: SE 30 to 41 knots
Seas: SSE 18 feet at 9 sec.

Afternoon

Gale warning with dangerous seas. Small craft advisory. Use extreme caution. Very large long period swell.
Winds: WNW 41 to 55 knots
Seas: S 17 feet at 11 sec.