Tropical Disturbance Better Organized

Tropical Disturbance Better Organized

Tropical Disturbance Better Organized

The National Hurricane Center has increased the probability of tropical cyclone formation (tropical depression or tropical storm) to 80 percent over the next 5 days and it could come sooner rather than later.

Latest satellite loops show an increase in showers and thunderstorms and there appears to be some sort of circulation trying to develop northeast of the Bahamas. The activity has been increasing all day long and continues to increase this evening.

Tropical Disturbance Better Organized

SATELLITE LOOP

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Tropical Disturbance Better Organized

NATIONAL HURRICANE CENTER OUTLOOK

TROPICAL CYCLONE FORMATION POSSIBLE

 

An Air Force plane will be investigating this system Friday afternoon. At this point there is no threat to us over the holiday weekend as the steering aloft is likely to carry this system to the west northwest or northwest over the next 3 days towards the Southeast US coast. Given the time of year this could develop into a tropical or subtropical storm. If it does develop the name will be Bonnie. If you recall we had Hurricane Alex back in mid January out in the Atlantic during the massive El Nino. The development of this system now could be an indicator that the La Nina pattern in the Pacific may be coming into play this hurricane season. Typically in La Nina years, hurricane activity in the Atlantic is above normal.

the tropical system on the GFS at this point is sitting off the South Carolina coast. This is very early for a tropial system to develop and water temperatures remain borderline for support. However the upper air profile off the southeast coast of the United States is favorable or at least not unfavorable for development.

Tropical Disturbance Better Organized Wind Shear Forecast

gfs72

Upper air winds way up in the upper atmosphere are fairly light. Wind shear is unfriendly to tropical storms. Think of taking shaving cream and making a pile of it and then putting a fan next to it. The shaving cream gets blown away. Wind shear essentially rips the tops of any thunderstorms and blows them apart. This prevents intensification and in fact if the shear is strong enough causes weakening.

Now from there the question is whether that moisture moves up the east coast and the upper air flow would argue against this.

Tropical Disturbance Better Organized

 Upper Flow Monday Night

gfs108

The upper flow is rather weak and the stronger westerly flow aloft lies just to our north. It would seem there is a higher chance that the tropical system could get lost in that weak flow to the south rather than take the option of moving northward. Also the lack of any upper air energy to interact with this suggests that even if turned northward, not much of it would be left of it other than a core of showers and thunderstorms. For now we think this is a non issue for us.

Read more on the Memorial Day Holiday Weekend.

 

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