Tropical Storm Bertha

July 16th, 2008 |

GOES-12 IR image

A GOES-12 IR image from the CIMSS Tropical Cyclones site (above) showed Tropical Storm Bertha continuing to linger over the western Atlantic Ocean on 16 July 2008 — this storm first became “Tropical Depression #2” over the eastern Atlantic, thirteen days earlier (on 03 July).

GOES-12 visible images (Animated GIF)

GOES-12 visible images with an overlay of SeaWinds data from the QuikSCAT satellite (above) revealed that there were still some bursts of convection near the center of the tropical cyclone, and maximum wind speeds remained near 60 knots. Tropical Storm Bertha was in the process of weakening as it began to encounter increasing environmental wind shear. AWIPS images of the GOES-12 water vapor channel (below) showed that the northeastward motion of Bertha was slowing, with a gradual turn toward the southeast as the tropical cyclone began to interact with a mid-latitude low located off to the  east (this middle to upper level low was drifting southwestward across the North Atlantic Ocean).

GOES-12 water vapor images (Animated GIF)

It is interesting to note the large pool of cooler Sea Surface Temperatures (cyan to blue colors) in the wake of slow-moving Bertha (below; sourced from Remote Sensing Systems).

Bertha Sea Surface Temperature image

2 Responses to “Tropical Storm Bertha”

  1. LW Seals says:

    This is interesting information. Cool satellite
    pictures showing what’s going on with the cyclones. Does the data here reflect any changes by the ozone layer, or global warming that may have contributed to these outcomes?

  2. scott.bachmeier says:

    Neither the ozone layer nor global warming have anything to do with this particular cyclone interaction. We occasionally see similar “Fujiwhara” type interactions between cyclones over the open oceans, and the influence of long-term climate change or lower stratospheric dynamics would be negligible.

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