berrywr
(Weather Analyst)
Fri Sep 03 2004 04:17 AM
Frances continues to weaken

Nice forum here. Anyway, I've looked at all the data as of 4:08 am ET and I expect on the 5 am advisory will maintain Frances as a Category 3 storm, though clearly the 0547Z vortex message clearly shows she's weakening due to subsidence on her NW side and S to SSE shear over her at 300mb. I took a look at the CIMSS data and there is a hint of an eye reappearing and she appears to be regaining her symmetry, though a bit flattened. It may also be noted that Frances may be undergoing an eye wall replacement at this time too. Tops have been cooling over the past couple of hours as well. Looking at the 300mb Analysis and 500 mb Analysis, I"m in agreement with NHC official track, though I wouldn't at all be surprised if this system comes to a virtual standstill at some point late Friday as a blocking ridge continues to slightly build NNW of the storm with axises extending WSW in the GOM and ENE into a another center near Bermuda. If Frances can get away from the shear, the warm Gulf Stream should reintensify her to a CAT 4 before landfall now projected for Saturday night. Recent water vapor imagery shows a decrease in dry air to it's N and NW, so I would think some strengthening is likely.


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