Typhoon Jelawat is the third named storm and the first typhoon of the year in the Western Pacific. Jelawat will continue on a northeastward track, staying several hundred miles north of Guam and the Northern Mariana Islands through early next week.Topics: WeatherOps | Tropical |
A weak area of low pressure (Invest 90B) formed a couple of hundred miles southwest of Sri Lanka last week, serving as a good reminder that the North Indian Ocean tropical cyclone season is just around the corner. Conditions become more favorable during spring as the northeast monsoon weakens in response to warming temperatures and weakening high pressure over Asia. The North Indian Ocean typically experiences tropical cyclones between April and December, with two peaks in May and November. There is a notable split in the season with little to no tropical cyclone activity during the summer months due to the influence of the southwest monsoon.Topics: WeatherOps | Tropical |
Over the weekend Tropical Cyclone Kelvin developed an impressive eye hours after moving inland near Anna Plains, Australia. Typically tropical cyclones weaken after landfall due to increasing friction and the loss of access to the energy provided by warm ocean waters. However, there are many records of tropical cyclones that maintain their strength or intensify after landfall. Northern Australia is one of the most favored regions of the world for this unique phenomenon known as the brown ocean effect.
It may still be a few more months before the US needs to worry about intense hurricanes, however in the South Pacific Ocean conditions differ. It is Tropical Cyclone season for those who live in the oceans around Australia. Today, Tonga was struck by a powerful one.Topics: WeatherOps | Tropical |
The northeast monsoon refers to the seasonal winds that flow southward from the cold Asian continent as strong high pressure develops over Siberia during winter. These cold, dry north to northeast winds flow from the Siberian high across Southeast Asia from about October through March. They surge southward with the passage of low-pressure systems in the midlatitudes, cooling ocean temperatures.
The Australian tropical cyclone season officially began on November 1, 2017, but the first tropical cyclone didn’t form until November 22. Through the first few weeks of the season, atmospheric conditions were unfavorable for development due to strong wind shear on the order of 40 knots and extensive dry air. Later in the month, wind shear decreased, and moisture increased south of Java and across the Timor Sea.
The weather patterns that affect northern Australia are monsoonal. There are distinct wet and dry patterns, driven by seasonal winds. From December through March, northeast monsoon winds flow across Southeast Asia in response to the strong Siberian High and cold Asian continent. Gaining moisture as they traverse the South China Sea, these winds turn northwesterly over the Java Sea south of the equator. By January this persistent northeasterly flow across Southeast Asia forces the monsoon trough, part of the Intertropical Convergence Zone (ITCZ), into its southernmost position near 10°S. The monsoon trough serves as a focus for the inflow of moist tropical air and brings enhanced west to northwesterly winds, cloudiness, and heavy rainfall to portions of northern Australia.Topics: WeatherOps | Tropical |
The 2017 Atlantic Hurricane Season will officially end on November 30. From Arlene to Rina, it has been an active few months. Let's take a look at the storms that took place.Topics: Tropical | Hurricane |
Weather and climate disasters are occurring at an alarming rate in the US. Hurricanes, wildfires, drought, tornadoes; all can cause a catastrophic loss in a matter of seconds. But are these extreme events occurring more often than in past decades?Topics: Tropical | Thunderstorm | Drought | Flood | Featured |
As of early October, the 2017 Atlantic hurricane season has produced 14 named storms, 8 of which have reached hurricane strength, and 5 of those major hurricane status (Category 3 or higher). Regarding storm numbers, this year is still below the average (since 1995) of 16 named storms for both neutral ENSO years and La Niña years (a La Niña is developing this year), but already at the average for hurricanes and one storm ahead of the average for major hurricanes.Topics: Tropical | Frontier | Hurricane |