ATL: INVEST 90L

[HURAKAN]

Nice loop

[Migle]

so it was de-activated I am guessing?

[cycloneye]

so it was de-activated I am guessing?

Is still active at NRL,but I think it will be deactivated in the next day or so.

[Hurricane Jed]

I think this year is going to be very bad especially for the us. with the record earthquake that just happened in japan the 2012 prediction doesnt seem that crazy.

Not really. The 70's had a lot of bad earthquakes, tropical cyclones and tornadoes in rapid succession worldwide. Up until recent its more or less been a few isolated incidents or brief bursts of bad weather. Its just a cycle and media tends to hype things moreso nowadays. For all we know we could have an El Nino pop up randomly or have a strong Saharan Air Layer this year.

[HURAKAN]

Nice image of 90L

[WeatherGuesser]

HURAKAN, is there some specific reason you're not re-sizing images before you post? Or at least posting links instead of images?

Some of your images are 1.6Mb, 3.4Mb, 1.2Mb, 2.1mb and 1.8Mb, plus several between 500Kb and 1Mb

Those create serious problems for people with slow connections or with bandwidth caps.

[DanieleItalyRm]

Yesterday INVEST 90L 999 Hpa - 35 kts





Landfall of INVEST 90L Today:

[brunota2003]

A sub-tropical cyclone is a low-pressure system existing in the tropical or subtropical latitudes (anywhere from the equator to about 50°N) that has characteristics of both tropical cyclones and mid-latitude (or extratropical) cyclones. Therefore, many of these cyclones exist in a weak to moderate horizontal temperature gradient region (like mid-latitude cyclones), but also receive much of their energy from convective clouds (like tropical cyclones). Often, these storms have a radius of maximum winds which is farther out (on the order of 100-200 km [60-125 miles] from the center) than what is observed for purely "tropical" systems. Additionally, the maximum sustained winds for sub-tropical cyclones have not been observed to be stronger than about 33 m/s (64 kts, 74 mph)).

Many times these subtropical storms transform into true tropical cyclones. A recent example is the Atlantic basin's Hurricane Florence in November 1994 which began as a subtropical cyclone before becoming fully tropical. Note there has been at least one occurrence of tropical cyclones transforming into a subtropical storm (e.g. Atlantic basin storm 8 in 1973).

Subtropical cyclones in the Atlantic basin are classified by the maximum sustained surface winds:

* less than 18 m/s (34 kts, 39 mph) - "subtropical depression",
* greater than or equal to 18 m/s (34 kts, 39 mph) - "subtropical storm"

Prior to 2002 subtropical storms were not given names, but the Tropical Prediction Center issued forecasts and warnings on them similar to those for tropical cyclones. Since 2003 they are given names from the tropical cyclone list.

http://www.aoml.noaa.gov/hrd/tcfaq/A6.html

The system had sustained convection about a surface low, and was also nonfrontal. It was well below 50N, over cool sst's, but also in an area where the air temps aloft are very cold as well. This system definitely showed features of a tropical system, so therefore I believe it was possibly subtropical. I wish we had research specifically for storms such as these.

[cycloneye]

Officially deactivated.

NHC_ATCF
invest_DEACTIVATE_al902011.ren
FSTDA
R
U
040
010
0000
201103121909
NONE
NOTIFY=ATRP
END

ftp://ftp.tpc.ncep.noaa.gov/atcf/tcweb/ ... 902011.ren