Archive Former Major Hurricane Irma (1 Viewer)

Blountwolf

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Euro vs. Goofus in the long range... I know my preference. Don't really like what my preference is saying though.
 

JayF

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Hurricane Irma Discussion Number 6
NWS National Hurricane Center Miami FL AL112017
500 PM AST Thu Aug 31 2017

Irma has become an impressive hurricane with intense eyewall
convection surrounding a small eye. Satellite estimates continue to
rapidly rise, and the Dvorak classifications from both TAFB & SAB
support an initial wind speed of 100 kt. This is a remarkable 50-kt
increase from yesterday at this time.

Microwave and satellite data suggest that an eyewall replacement
cycle could be starting. This isn't surprising given how small the
eye is, and will probably be the first of many eyewall cycles for
this hurricane. Overall, Irma should be in a low-shear environment
for several days, with the intensity controlled by eyewall cycles
and the moderately warm SSTs along the path. Thus the forecast
intensity is leveled off for the next 2 days. After the weekend,
Irma should be moving over much warmer water, with SSTs forecast to
be 29C at the end of the period. All indications are for Irma to be
strengthening by the end of the forecast period, with the NHC
prediction adjusted slightly upward from the previous one, in line
with the extremely low pressures forecast by the global and regional
hurricane models at that time.

Irma continues moving west-northwestward, now at about 10 kt.
There has been no change to the forecast philosophy, with the
hurricane likely to turn westward and west-southwestward over the
next few days due to a building ridge over the central Atlantic. At
long range, however, model guidance is not in good agreement on the
strength of the ridge, resulting in some significant north-south
differences in the global models. I am inclined to stay on the
southwestern side of the model guidance, given the rather consistent
forecasts of the ECMWF and its ensemble. In addition, the strongest
members of the recent ensembles are on the southern side on the
consensus, giving some confidence in that approach.


FORECAST POSITIONS AND MAX WINDS

INIT 31/2100Z 17.3N 34.8W 100 KT 115 MPH
12H 01/0600Z 17.8N 36.2W 105 KT 120 MPH
24H 01/1800Z 18.2N 38.3W 105 KT 120 MPH
36H 02/0600Z 18.3N 40.7W 105 KT 120 MPH
48H 02/1800Z 17.9N 42.9W 105 KT 120 MPH
72H 03/1800Z 16.8N 47.5W 110 KT 125 MPH
96H 04/1800Z 16.0N 52.0W 115 KT 130 MPH
120H 05/1800Z 16.5N 56.5W 120 KT 140 MPH

$$
Forecaster Blake
 

Brent

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GFS now hitting the area around NC/VA/MD, big west shift

CMC basically agrees with the Euro and is near Miami at day 10

HWRF Is a beast on the Euro track

21297508_1512347782181873_1812407689_o.png
 

KoD

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CNN headline: "Hurricane Irma could be the next disaster"

giphy.gif


Let's wait until we get some model consensus at least. Right now this thing could hit anywhere from Mexico to Canada, or Bermuda or nothing at all.

Incredible strengthening though, this thing is beautiful on satellite.
 

JayF

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Irma has weakened a little bit and is now a Category 2 Hurricane
 

Blountwolf

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Latest GFS ensemble has a lot of members coming back west... Hoping the Euro doesn't agree and goes full fish on Irma.
 

JayF

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GFS is starting to forecast Hurricane Irma making landfall in Florida or the east coast. GFS Landfall IRMA.png
 

JayF

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WTNT31 KNHC 012049
TCPAT1

BULLETIN
Hurricane Irma Advisory Number 10
NWS National Hurricane Center Miami FL AL112017
500 PM AST Fri Sep 01 2017

...IRMA TURNS WESTWARD WITH 120-MPH WINDS...


SUMMARY OF 500 PM AST...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...18.8N 39.1W
ABOUT 1495 MI...2405 KM E OF THE LEEWARD ISLANDS
MAXIMUM SUSTAINED WINDS...120 MPH...195 KM/H
PRESENT MOVEMENT...W OR 275 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...964 MB...28.47 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.

Interests in the northern Leeward Islands should monitor the
progress of this system.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 500 PM AST (2100 UTC), the center of Hurricane Irma was located
near latitude 18.8 North, longitude 39.1 West. Irma is moving toward
the west near 13 mph (20 km/h). A turn toward the west-southwest
is expected tomorrow.

Maximum sustained winds are near 120 mph (195 km/h) with higher
gusts. Irma is a category 3 hurricane on the Saffir-Simpson
Hurricane Wind Scale. Fluctuations in strength, up or down, are
possible during the next few days, but Irma is expected to remain a
powerful hurricane through the weekend.

Hurricane-force winds extend outward up to 25 miles (35 km) from the
center and tropical-storm-force winds extend outward up to 105 miles
(165 km).

The estimated minimum central pressure is 964 mb (28.47 inches).


HAZARDS AFFECTING LAND
----------------------
None


NEXT ADVISORY
-------------
Next complete advisory at 1100 PM AST.

$$
Forecaster Blake
 

Brent

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Well the 18z GFS was pretty much an unspeakable nightmare into NYC so it has to get better from here

12z Euro had a Floyd-like thing off Florida

The GFS ensembles look horrible for Florida
 

Jacob

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Well the 18z GFS was pretty much an unspeakable nightmare into NYC so it has to get better from here

12z Euro had a Floyd-like thing off Florida

The GFS ensembles look horrible for Florida

I think this morning's 06Z GFS was even worse than yesterday's 18z for NYC. Slams it into New Jersey as a Cat 4/5 moving due north. Manhattan would be on the eastern side of the eye.

Fortunately, we're more than a week off.
 

Tyler Penland

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0z GFS continuing the gradual south placement of landfall.

Sent from my SM-G930R7 using Tapatalk
 

KoD

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GFS has been very consistent with storm track with east coast landfall 6 out of 6 runs. There's a lesser degree of speed consistency but it's within reason.
ECMWF hasn't been as consistent but 2 of the past 3 runs have depicted east coast landfall but with a more southerly track and a more southerly landfall. Both are showing this to be a very powerful major hurricane again within a few days.
If they're still progging this solution by the time we're <140hrs out, I'll be getting real concerned.
 

bingcrosbyb

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Last few GFS runs have trended from upper east coast to mid Atlantic coast (west) hit. Still Cat 3 with 115mph winds, but about to enter warmer weather waters. Coming closer into agreement with overall Euro track that puts Irma knocking on Florida or Georgia's door.
 

Jacob

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Well, a nice big west trend on the 12z Euro. Was hoping to start seeing things go the other direction.
 

Jacob

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It makes the northward turn before making it to FL. May very well still go out to sea.

Sure enough, makes a hard right and doesn't make landfall anywhere on this run. Would give quite a few a good scare on the east coast in the process though.
 

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