Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.
By: Dr. Jeff Masters , 3:03 AM GMT on October 09, 2005
Subtropical Depression 22
Subtropical Depression 22 dissipated Saturday evening, torn apart by wind shear. Its remnants will continue west towards the Carolinas, but are not expected to regenerate or bring significant rains to the U.S.
What's behind TD 22?
The tropical disturbance we've been following about 650 miles east of the Lesser Antilles Islands has grown disorganized, and now has 20 knots of shear over it. Development is not expected on Sunday, but some slow development after that is possible.
Deep convection has increased at the center of a non-tropical low between the Canary Islands and the Azores Islands. This low may become a subtropical depression on Sunday or Monday. Little motion is expected the next two days.
Figure 1. Model tracks for suspect area east of the Lesser Antilles Islands.
Stan now ranks as one of the 30 most deadly hurricanes of all time, with over 1500 deaths caused. Stan will proabably far surpass Katrina as the most deadly hurricane of 2005; Katrina's death toll stood at 1242 at last count, with 1003 of the deaths in Louisiana. The grim task of recovering bodies in Guatemala continues today, where the entire town of Panabaj in western Guatemala was buried in a landslide, killing all 800 residents. Another 600 died in mudslides elsewhere in Guatemala. The storm also killed 67 people in El Salvador, 24 in Mexico and 11 in Nicaragua. Hundreds more are missing and presumed buried under landslides near Lake Atitlan in Guatemala. In a freakish double whammy, a magnitude 5.8 earthquake hit Guatemala Friday, causing additional damage, but no deaths. Also bizzare is the volcanic eruption that occured during the height of Stan rains in El Salvador on October 1. The eruption killed two and injured dozens. When you add these events to the magnitude 5.4 earthquake that rocked Taiwan at the height of Tyhoon Longwang on October 1, one might wonder if there is a connection between seismic activity and hurricane activity! There isn't.
Historically, 20% of all Atlantic tropical storms have occured in the month of October. In a nomal year, this means we can expect two tropical storms, one of which becomes a hurricane. According to Dr. Bill Gray's October 2005 hurricane forecast issued on October 3, this year we can expect an above average October, with three tropical storms, two of which become hurricanes--one of those a major hurricane. We have already had two named storms this month, Stan and Tammy. Long range computer model forecasts continue to show that conditions for breeding tropical storms will be excellent until at least the last week of October, so two more named storms--Vince and Wilma--will likely result by the end of October. This would tie 2005 with 1933 as the busiest hurricane season ever. It is interesting to note that in 1933, the final three storms all showed up after October 25. If 2005 follows a similar pattern, we'll have Alpha, and Beta in addition to Vince and Wilma before it's all over. Dr. Bill Gray is not forecasting any November storms to form. However, we should get at least one, given the current pattern and continued above-normal sea surface temperatures over the Atlantic.
Figure 2. Typical tropical storm formation areas for October.
The next update will be Sunday around 11 am.
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