Tag Archive for 'wind shear'
October 2nd, 2009 by Steven DiMartino
6:47 AM
The tropical Atlantic remains quiet this morning with little change in the upper level pattern across the Atlantic. A deep trough dominates the Gulf of Mexico through the central Caribbean, prevent any type of development for at least the next 48 hours. A strong upper low over the central Atlantic is also enhancing westerly [...]
September 10th, 2009 by Steven DiMartino
4:45 AM
Strengthening wind shear has started to influence Hurricane Fred early this morning as the hurricane continues to weaken. Hurricane Fred has weakened to a category 2 hurricane with sustained winds around 105 mph. Fred is moving to the northwest at 10 mph.
Strong southwesterly and southerly upper level winds will produce strong shear over [...]
September 9th, 2009 by Steven DiMartino
9:13 PM
There is a lot of action going on that I will discuss tonight. Specifically I will touch on the development of Hurricane Fred and what to expect with the coastal low off the Mid Atlantic coast over the next 66 hours.
Fred became a major hurricane today with sustained winds of around 115 mph, which [...]
September 7th, 2009 by Steven DiMartino
4:45 AM
The main story in the Tropical Atlantic this morning is a very impressive tropical wave coming off the African coast. This wave is exhibiting a strong low level circulation and thus far a well developed area of convection around that center. For now, the upper level environment is favorable for development and the potential [...]
September 3rd, 2009 by Steven DiMartino
9:10 AM
The big news this afternoon is the continued weakening of now Tropical Depression Erika. The center of Erika, poorly defined in the first place, was severely exposed from the strong convection due to strong westerly and southwesterly wind shear at roughly 250 MB. As a result, the thunderstorms simply could not reform closer to [...]
September 2nd, 2009 by Steven DiMartino
11:20 AM
Tropical Storm Erika continues to weaken late this morning as strong southwesterly shear has sufficiently disrupted the low level circulation. Sustained winds have fallen off from 60 mph to 40 mph and the pressure has now risen to 1008 MB.
There is a pretty wide range in the models as far as solutions for [...]
September 2nd, 2009 by Steven DiMartino
4:45 AM
Tropical Storm Erika continues to strengthen this early morning. Tropical Storm Erika has 60 mph winds and continues to remain stationary to the east of the northern Leeward Islands. The fact that Erika is key here as wind shear continues to weaken. Clearly, model guidance did not in any way expect Erika to flat [...]
August 26th, 2009 by Steven DiMartino
8:58 PM
The big news today is that Tropical Danny has formed roughly 735 miles east of Nassau of the Bahamas. Tropical Storm Danny is still rather poorly organized this evening. The low level circulation is well to the west of the deepest convection, however stronger convection is just now starting to wrap around the low [...]
August 16th, 2009 by Steven DiMartino
6:30 PM
While much of the forecast area remained dry and hot, the tropical Atlantic continued to increase in activity. Three named storms are active this evening; Tropical Depression Ana, Tropical Storm Bill, and Tropical Storm Claudette.
Ana has weakened over the past 12 hours to a tropical depression with sustained winds of 35 mph. Ana continues [...]
August 14th, 2009 by Steven DiMartino
5:35 AM
Tropical Depression Two is on its last legs after hours of southeasterly shear and a lack of convection around the low level center. In fact, the National Hurricane Center even decided to stop issuing updates on what is now just a tropical low pressure system.
So why did Tropical Depression Two basically collapse? Well, there [...]