| txcntrygrl |
| (Registered User) |
| Tue Aug 21 2007 02:21 AM |
|
Re: Dean Headed to Yucatan, Watching System East of Bahamas
|
I am new here and have a question.
I have read numerous posts and they refer to something called ULL. I am not 100% sure what that is and how it can affect Dean's path. Also is there a way to see this ULL on a given map?
ULL is short for "upper level low." It can affect a tropical system's path by changing the winds at upper levels; these winds are, to a large degree, the features that steer tropical systems. You can see these on water vapor satellite imagery, available from the NHC's satellite page (among other places). --Clark