Question

This is the general tropical discussion area. Anyone can take their shot at predicting a storms path.

Moderator: S2k Moderators

Forum rules

The posts in this forum are NOT official forecasts and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or STORM2K. For official information, please refer to products from the National Hurricane Center and National Weather Service.

Help Support Storm2K
Post Reply
Message
Author
Tip
Category 1
Category 1
Posts: 325
Joined: Fri May 30, 2003 7:31 am

Question

#1 Postby Tip » Fri Aug 15, 2003 11:54 am

Is it theoretically possible for a cyclone to form south of the equator and then move north of the equator? It would seem impossible since it would have to reverse its spin. The reason I am asking is because there is an INVEST near 2S in the South Pacific that may have a chance to cross the equator.

http://152.80.49.216/tc-bin/tc_home.cgi
0 likes   
Top
User avatar
wxman57
Moderator-Pro Met
Moderator-Pro Met
Posts: 22979
Age: 67
Joined: Sat Jun 21, 2003 8:06 pm
Location: Houston, TX (southwest)

YEs

#2 Postby wxman57 » Fri Aug 15, 2003 11:56 am

Yes, I believe it is possible and that it has happened in the past. However, a storm would NOT have to reverse its spin. The coriolis force is quite small at those lower latitudes, so a storm could spin the "wrong" way. Just like you can have anticyclonically-rotating tornadoes.
0 likes   
Top
User avatar
Scott_inVA
Storm2k Forecaster
Storm2k Forecaster
Posts: 1238
Joined: Sat Oct 12, 2002 5:44 pm
Location: Lexington, Virginia
Contact:
Contact Scott_inVA

Re: YEs

#3 Postby Scott_inVA » Fri Aug 15, 2003 12:03 pm

wxman57 wrote:Yes, I believe it is possible and that it has happened in the past. However, a storm would NOT have to reverse its spin. The coriolis force is quite small at those lower latitudes, so a storm could spin the "wrong" way. Just like you can have anticyclonically-rotating tornadoes.



Yes, if fact, one TC did so, crossing the equator into South America. Only one I think.


PERRY...WHERE ART THOU???
He is the resident keeper of such trivia. :wink:

Scott
0 likes   
Top
User avatar
wxman57
Moderator-Pro Met
Moderator-Pro Met
Posts: 22979
Age: 67
Joined: Sat Jun 21, 2003 8:06 pm
Location: Houston, TX (southwest)

Crossing

#4 Postby wxman57 » Fri Aug 15, 2003 1:13 pm

I was thinking of a storm in the west Pacific.
0 likes   
Top
User avatar
Scott_inVA
Storm2k Forecaster
Storm2k Forecaster
Posts: 1238
Joined: Sat Oct 12, 2002 5:44 pm
Location: Lexington, Virginia
Contact:
Contact Scott_inVA

Re: Crossing

#5 Postby Scott_inVA » Fri Aug 15, 2003 1:27 pm

wxman57 wrote:I was thinking of a storm in the west Pacific.


I remember late in 2001 there was a TC south of China either at or just north of the Equator? Wasn't that when the US Navy headed toward the Equator and got hit anyway? Did the Typhoon cross? Maybe I just need a new crack pipe :?

Scott
0 likes   
Top
User avatar
isobar
Category 5
Category 5
Posts: 2002
Joined: Thu Feb 06, 2003 9:05 am
Location: Louisville, KY

#6 Postby isobar » Fri Aug 15, 2003 1:29 pm

Is this the pup you're looking for?

Typhoon Vamei: http://www.weather.nps.navy.mil/cpchang/papers/vamei/vamei.htm

Found some images:
http://www.meto.govt.uk/sec2/sec2cyclone/tcimages/nhem01/vamei2712b.gif
Last edited by isobar on Fri Aug 15, 2003 1:40 pm, edited 1 time in total.
0 likes   
Top
User avatar
isobar
Category 5
Category 5
Posts: 2002
Joined: Thu Feb 06, 2003 9:05 am
Location: Louisville, KY

#7 Postby isobar » Fri Aug 15, 2003 1:34 pm

There's also this image of an unnamed Atlantic TC south of equator in April 1991.

Image
0 likes   
Top
User avatar
wxman57
Moderator-Pro Met
Moderator-Pro Met
Posts: 22979
Age: 67
Joined: Sat Jun 21, 2003 8:06 pm
Location: Houston, TX (southwest)

Nope

#8 Postby wxman57 » Fri Aug 15, 2003 2:05 pm




That storm formed near the Equator but didn't cross it.
0 likes   
Top
User avatar
wxman57
Moderator-Pro Met
Moderator-Pro Met
Posts: 22979
Age: 67
Joined: Sat Jun 21, 2003 8:06 pm
Location: Houston, TX (southwest)

#9 Postby wxman57 » Fri Aug 15, 2003 2:07 pm

isobar wrote:There's also this image of an unnamed Atlantic TC south of equator in April 1991.



I remember that storm. I had pointed out to my coworkers that we had a TD/TS in the South Atlantic and they didn't believe me. Back then we had no imagery on computers - just some pretty bad images that came over the WeFax line.
0 likes   
Top
User avatar
Stormsfury
Category 5
Category 5
Posts: 10549
Age: 53
Joined: Wed Feb 05, 2003 6:27 pm
Location: Summerville, SC

#10 Postby Stormsfury » Fri Aug 15, 2003 2:21 pm

wxman57 wrote:
isobar wrote:There's also this image of an unnamed Atlantic TC south of equator in April 1991.



I remember that storm. I had pointed out to my coworkers that we had a TD/TS in the South Atlantic and they didn't believe me. Back then we had no imagery on computers - just some pretty bad images that came over the WeFax line.


Occurred April 1991 ... estimated to be 50 mph at maximum ...
The South Atlantic tropical storm became subject of a trick question in regards to seeing posts of the only Atlantic tropical storm in April when it was pointed out that it wasn't ... *LOL* (in regards to Ana back in April ... Ana is the only North Atlantic T.S.) ...

That image isobar supplied is from the UKMET tropical weather page, I believe.

SF
0 likes   
Top
Post Reply

Return to “Talkin' Tropics”

Who is online

Users browsing this forum: Argcane, cycloneye, Google [Bot], Google Adsense [Bot], Ian2401, riapal, Stormybajan and 46 guests