Typhoon Sanvu in the Pacific
Posted by
Chris in Tampa on 9/1/2017, 11:38 pm
If you're looking for info on Irma, maybe skip this post. It's more just something I'm curious about. There's no conclusions at the end of this post, just kind of a ramble.
I have seen some talk about Typhoon Sanvu possibly having impacts on the track of Irma. I just wanted to start off by saying, I have no idea to what extent it plays a role, if any. I don't see a whole lot about it, but basically it seems as though Sanvu would make the jet stream more wavy across the US.
I post this out of interest to what role something like this plays, not because I can demonstrate its relevance.
This was from a day ago:
"MSLP/250-hPa Jet/Thick." from: http://www.atmos.albany.edu/student/abentley/realtime/northamer_svr.php
This was from earlier today, though I don't quite understand the relevance:
View of that at Tropical Tidbits, with a little wider of a view: https://www.tropicaltidbits.com/analysis/models/?model=gfs®ion=npac&pkg=pv330K
The below is from an outdated article (it talks about more model runs showing an offshore track today, but that has changed since then with the 18Z GFS), but it has an understandable explanation that I have seen atmopsheric scientists talking about and I couldn't find anything better:
"Interestingly, the placement of the trough in particular will be partially determined by another tropical cyclone - Typhoon Sanvu - located thousands of miles away in the North Pacific, off the coast of Japan.
Studies have shown that when powerful typhoons recurve away from Japan, as Typhoon Sanvu is forecast to do, they can energize the highway of swiftly flowing winds at high altitudes, popularly known as the jet stream, and lead to a more active weather pattern across North America.
For the jet stream, the storms can function as an injection of steroids, causing it to amplify and contort itself into large north-south undulations. These waves, known to meteorologists as ridges and troughs, get carried downstream like ripples in a pond, affecting weather in Alaska and the continental U.S."
For information on Sanvu:
Typhoon Sanvu floater:
http://www.ssd.noaa.gov/PS/TROP/floaters/17W/17W_floater.html
Wider Pacific views: http://www.ssd.noaa.gov/PS/TROP/trop-epac.html
Joint Typhoon Warning Center (JTWC):
https://metoc.ndbc.noaa.gov/JTWC/
GFS 250mb wind speed / streamlines and MSLP:
https://www.tropicaltidbits.com/analysis/models/?model=gfs®ion=npac&pkg=uv250
GFS 500mb Geo. Height and MSLP:
https://www.tropicaltidbits.com/analysis/models/?model=gfs®ion=npac&pkg=z500_mslp
The 250mb wind speed / streamlines is interesting. Whether it is Sanvu that is impacting anything downstream, I don't know. You have Sanvu, but another low ahead of it. I've never watched these interactions closely before. The colors on that map are more vibrant to see.
The second shows a better view of the trough with 500mb heights in a map I've looked at more often, along with how the one particular trough digs down in the US in this particular model.
A lot going on in those images.
For those interested, about jet streams:
http://www.srh.noaa.gov/jetstream/global/jet.html
Like I said, no conclusions in this post, just got off into looking into it after seeing some atmospheric scientists and meteorologists discussing it on Twitter. |
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