Drew.Gardonia
nothing other than just a hunch, and the fact that normally after El Nino it gets pretty active.
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Ida
- Thread starter Jason Harris
- Start date
nothing other than just a hunch, and the fact that normally after El Nino it gets pretty active.
cdcollura
EF5
Good day all,
I was watching Ida and suprised it made it as intense as it did on Sunday (11-8). I even gathered / dusted off some of my equipment, and was considering a drive to the FL panhandle / taking off a day or so at work ... But always keeping in mind that it's 2009 - And November - And shear and cool water exist along its path.
Sure enough, and in just over 6 hours, it went from cat-2 to a tropical storm. Had this been a weekend chase, maybe, but I am saving for next year.
The big disappointment (yeah, I bet you guys heard me say that alot this year) was the motion of NNW all the way from Cuba to WEST of the FL Panhandle. For environmental parameters, this track was the WORST possible track it could have taken for intercept options ... Knowing a powerful jet stream is along the N Gulf (shear) and over water temperatures in the upper 60's to low 70's. Not good.
Normally, or had this NOT been 2009, a storm forming in the W caribbean SHOULD move north, then northeast. Had Ida did that, Florida's SW coast is where I would probably be right now, getting my face ripped off by the wind
I was watching Ida and suprised it made it as intense as it did on Sunday (11-8). I even gathered / dusted off some of my equipment, and was considering a drive to the FL panhandle / taking off a day or so at work ... But always keeping in mind that it's 2009 - And November - And shear and cool water exist along its path.
Sure enough, and in just over 6 hours, it went from cat-2 to a tropical storm. Had this been a weekend chase, maybe, but I am saving for next year.
The big disappointment (yeah, I bet you guys heard me say that alot this year) was the motion of NNW all the way from Cuba to WEST of the FL Panhandle. For environmental parameters, this track was the WORST possible track it could have taken for intercept options ... Knowing a powerful jet stream is along the N Gulf (shear) and over water temperatures in the upper 60's to low 70's. Not good.
Normally, or had this NOT been 2009, a storm forming in the W caribbean SHOULD move north, then northeast. Had Ida did that, Florida's SW coast is where I would probably be right now, getting my face ripped off by the wind
Live Feeds from TS Ida are beginning to come online at ChaserTV:
James Kinkaid: http://bit.ly/LXAOJ
John Sibley: http://bit.ly/1WNtJJ
For media followers, you may license these feeds by simply clicking the respective link and following contact info below the feed.
James Kinkaid: http://bit.ly/LXAOJ
John Sibley: http://bit.ly/1WNtJJ
For media followers, you may license these feeds by simply clicking the respective link and following contact info below the feed.
Tim Lumb
Brett Adair is also streaming TS Ida on severestudios.
http://bit.ly/3cSBZl
It is weird thinking this is the first US landfall this year.
http://bit.ly/3cSBZl
It is weird thinking this is the first US landfall this year.
rdale
EF5
Second - Claudette made landfall in Florida.
Tim Lumb
cdcollura
EF5
rdale
EF5
Did anyone find tropical storm winds recorded anywhere on US land? Best I can come up with is mid-upper 20's, but that's a pretty wide area where NHC said would get hammered and I didn't search everything.
Robert Dewey
EF5
I seen a 65knt wind barb from a 5-minute ASOS station, just west of MOB. All others were sub-50knt. To be honest, I wasn't paying close attention... I just happened to load up an IR image with METARs overlaid.
rdale
EF5
Thanks, I checked all ASOS sites from Mobile to Gulfport and none were greater than 30kts, so maybe that was just a decoding error on your satellite imagery? I'll keep hunting.
Robert Dewey
EF5
I think you might be right. This is the best I see looking through METARs (note that the gusts don't even reach TS sustained criteria):
cdcollura
EF5
Good day all,
It is a pretty straight-forward process on tropical to extratropical transition. Rather simpler than the opposite.
Basically, when a tropical cyclone reaches the mid-latitudes, where there is a baroclinic zone (temperature gradient with lattitude, very common during the fall months or in the N Atlantic), and an upper trough present, the following happens...
1). The circulation of the surface low (tropical cyclone in the N Hemisphere) begins pulling cooler air down from the north (on it's western side) and push warm air northward on it's eastern side. This forms the respective cold and warm "fronts".
2). The strong winds aloft, assosiated with the jet stream / upper trough remove (shear off) the deep convection around the core of the system, leaving only the low in it's place. This upper ttrough, however, may help sustain or even intensify the extratropical system once it is no longer tropical.
3). Once extratropical, the core temperature of the storm center is the same or cooler than the "outside world" at the surface (opposed to warmer as with a tropical system). The deep convection is now associated with the cold front, with a large "dry slot" punching into the western side of the extratropical low noted on satellite.
4). Frontal occlusion occurs quickly because of the initially fast rotational speed of the storm (cold front quickly overtakes the warm front).
I found very technical link (that's free too!) that also might help explain this a bit better...
http://www.docstoc.com/docs/15659849/Extratropical-_-Tropical-Transition-Two-trajectories-through
Thanks all,
It is a pretty straight-forward process on tropical to extratropical transition. Rather simpler than the opposite.
Basically, when a tropical cyclone reaches the mid-latitudes, where there is a baroclinic zone (temperature gradient with lattitude, very common during the fall months or in the N Atlantic), and an upper trough present, the following happens...
1). The circulation of the surface low (tropical cyclone in the N Hemisphere) begins pulling cooler air down from the north (on it's western side) and push warm air northward on it's eastern side. This forms the respective cold and warm "fronts".
2). The strong winds aloft, assosiated with the jet stream / upper trough remove (shear off) the deep convection around the core of the system, leaving only the low in it's place. This upper ttrough, however, may help sustain or even intensify the extratropical system once it is no longer tropical.
3). Once extratropical, the core temperature of the storm center is the same or cooler than the "outside world" at the surface (opposed to warmer as with a tropical system). The deep convection is now associated with the cold front, with a large "dry slot" punching into the western side of the extratropical low noted on satellite.
4). Frontal occlusion occurs quickly because of the initially fast rotational speed of the storm (cold front quickly overtakes the warm front).
I found very technical link (that's free too!) that also might help explain this a bit better...
http://www.docstoc.com/docs/15659849/Extratropical-_-Tropical-Transition-Two-trajectories-through
Thanks all,
IAN GIAMMANCO
EF0
Texas Tech deployed 7 StickNet probes, with a whopping peak instantaneous (10Hz) gust of 52 mph from a probe located at Ft. Morgan at the western end of Gulf Shores. The peak 1-min mean was 40 mph from the same probe. All measured at 2.25 m height.
Our new Ka-band mobile radar system was also deployed on Gulf Shores, not sure what the peak in the radial velocity data was yet.
Interesting feature observed by the radar (and 88-D) and supported from some of the thermo data from the StickNets was a developing baroclinic zone about 04Z, which was sort of a developing warm front (using the term loosely). Also helped to develop some convective elements as it moved northward.
Our new Ka-band mobile radar system was also deployed on Gulf Shores, not sure what the peak in the radial velocity data was yet.
Interesting feature observed by the radar (and 88-D) and supported from some of the thermo data from the StickNets was a developing baroclinic zone about 04Z, which was sort of a developing warm front (using the term loosely). Also helped to develop some convective elements as it moved northward.
Brett Adair
EF5
I noticed the pseudo-baroclinc zone as well. Where were you guys located on Fort Morgan? We were out there on the tip of the island and didn't really see anyone except for a couple of chasers. I have to agree that the winds with the system weren't the most impressive that I've seen. We measured 50 mph winds when we were shooting for the newscast around 10PM at Orange Beach, AL.
IAN GIAMMANCO
EF0
Brett,
the probe was located on some earth works on the southwest side of the Fort... we deployed it mid-afternoon on the 9th and then headed east to finish up with 4 probes closer to the Ka-band's domain. The StickNet crew ended up staying in Foley, radar crew ended up operating till about 1 am on the 10th from Gulf Shores. They were located to the east of Foley's longitude in one of the large, park/beach access parking lots.
We were hoping for a little better on shore flow, but the circulation got so strung out, and seemed like it the mid-level center got completely detached from the surface circ. sometime during the evening on the 9th... in fact it was so sheared that the radar crew was trying to do RHI's, pointed the antenna into the surface flow trying to get most of the total wind but a few tilts up, the flow was nearly perpendicular to the beam. Most of the StickNets were setup to get on-shore marine exposure, with obstructions in other directions, and what resulted was a more along shore flow which degraded the probe's exposure. I would guess had they all been in true open exposure in all directions the wind data would have been a little higher.
the probe was located on some earth works on the southwest side of the Fort... we deployed it mid-afternoon on the 9th and then headed east to finish up with 4 probes closer to the Ka-band's domain. The StickNet crew ended up staying in Foley, radar crew ended up operating till about 1 am on the 10th from Gulf Shores. They were located to the east of Foley's longitude in one of the large, park/beach access parking lots.
We were hoping for a little better on shore flow, but the circulation got so strung out, and seemed like it the mid-level center got completely detached from the surface circ. sometime during the evening on the 9th... in fact it was so sheared that the radar crew was trying to do RHI's, pointed the antenna into the surface flow trying to get most of the total wind but a few tilts up, the flow was nearly perpendicular to the beam. Most of the StickNets were setup to get on-shore marine exposure, with obstructions in other directions, and what resulted was a more along shore flow which degraded the probe's exposure. I would guess had they all been in true open exposure in all directions the wind data would have been a little higher.
