The Captain checked the weather radar before beginning the non-precision approach to runway 15.It showed no convective cells on the aircraft's path and he turned it off.As Flight 1572 began its final approach the crew was advised that the control tower was closing temporarily due to severe weather buckling a window inside the cab.…
Due to low vertical windshear, Sinlaku gathered strength while it was on the South China Sea.The next day, convective activity increased near the storm's center.In the same time, the JMA upgraded Sinlaku to a severe tropical storm.…
Most aircraft flying these routes are able to avoid the larger convective cells without incident.
The following day, a low-level circulation developed and convective activity began to increase around the low.By December 30, sufficient shower and thunderstorm activity had developed for the National Hurricane Center (NHC) to classify it as a tropical cyclone.…
Some research has also been done on the effect of different types of convective dryers.Jayas and Ghosh found that the percentage of stress cracked kernels was largest with cross-flow driers and smallest with concurrent-flow dryers.…
However, they form under clear skies and are no stronger than the weakest tornadoes.They form when a strong convective updraft is formed near the ground on a hot day.If there is enough low level wind shear, the column of hot, rising air can develop a small cyclonic motion that can be seen near the ground.…
The expansion phase of a pulsation is caused by the blocking of the internal energy flow by material with a high opacity, but this must occur at a particular depth of the star to create visible pulsations.If the expansion occurs below a convective zone then nothing will be visible at the surface.If the expansion occurs too close to the surface then there may be no restoring force to create a pulsation.…
A Lake Effect Snow Advisory is issued by the National Weather Service of the United States when lake effect snow may pose a hazard or is life-threatening.The snow must be completely caused by a convective snow development over a lake and not by a low pressure system.The criteria for this advisory vary from area to area.…
A weak surface trough, located to the west of an upper-level low, developed convection to the east of the Bahamas on July 26.A tropical wave entered the area two days later, resulting in an increase of convective organization and area.Although conditions were not favorable for tropical cyclone formation, it sped to the northwest and steadily organized, developing a surface area of low pressure on the 30th.…
Hurricane Fran originated from a tropical wave that moved off the western coast of Africa, entering the Atlantic Ocean, on August 22, 1996.Not long after moving over water, convective banding features formed around a developing area of low pressure.Ships in the vicinity of the system confirmed that a surface circulation had formed later that day.…
After post-storm analysis, it was determined that the low had developed into a depression around 0000 UTC.Several hours after being designated, the system began to develop convective banding features.Roughly 18 hours after being declared a depression, the National Hurricane Center (NHC) upgraded it to a tropical storm, giving it the name Bob.…
Developing within the monsoon trough, convection increased near Truk on October 16.A central convective feature formed, and the system became a tropical depression that afternoon.Moving northwest, the depression weakened as it became sheared from the north and a larger circulation formed to its southeast, which evolved into Thad.…
The eastern low developed into Typhoon Joan, while the western cyclone became the system that would intensify into Typhoon Ivan.Situated in an environment without significant convective activity, this system initially struggled to become organized.However, the disturbance began to mature, and by October 11, the Joint Typhoon Warning Center (JTWC) discovered a low-level circulation center, prompting the issuance of a Tropical Cyclone Formation Alert the following day.…
The most used method is based on the convective heat transfer.
The JTWC then upgraded the disturbance to a Tropical Cyclone 16S, and it is forecast gradually move southwestward and strengthen for the next couple of days.It already began to show a defined organization with some convective banding that same day.…
The storm, is in the top right portion of the image and has a poorly defined eye.A red mass, depicting strong convective activity, is present along the eastern side of the storm.The damage dealt to the agricultural sector of Antigua and Barbuda fueled major concerns for "food security" in 2009.…
Importantly in that case, was that although overall CAPE was weak, there was strong CAPE in the lowest levels of the troposphere which enabled an outbreak of minisupercells producing large, long-track, intense tornadoes.A good example of convective instability can be found in our own atmosphere.If dry mid-level air is drawn over very warm, moist air in the lower troposphere, a hydrolapse (an area of rapidly decreasing dew point temperatures with height) results in the region where the moist boundary layer and mid-level air meet.…
During spring and summer (year-round in the tropics), lightning from distant storms creates significantly higher background noise levels, often becoming an insurmountable obstacle to maintaining normal communications.Nearby convective weather activity during the summer months can make the band completely unusable, even for local communications.In the winter months during the peak years of the sunspot cycle, auroral effects can also render the band useless for hours at a time.…
As it moved northwest around northern Taiwan late on the morning of July 22.By late afternoon a surface low formed with enough convective activity to be designated a tropical depression.Moving northwest at, the cyclone briefly became a tropical storm before nearly land and weakening back into a tropical depression.…
The storm rapidly weakened throughout the day as convection gradually dissipated around the center due to the shear.By the late morning hours, little convective activity remained around the low pressure center of Felicia.A weak cyclone, the storm continued to track towards Hawaii with the only deep convection associated with it being displaced to the northeast of the center.…
