Category: Elsewhere in Weather News

Elsewhere in Weather News: August 8th, 2014

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Multiple Hurricanes and Typhoons in the Pacific

The Pacific Ocean has been busy lately and continues to impress this past week with four different tropical cyclones simultaneously ongoing.

GOES image of Julio, the beginnings of Genevieve, Iselle and Halong (in the top left corner). Taken earlier this week; storm intensities have since changed. (Source: NASA)
GOES image of Julio, the beginnings of Genevieve, Iselle and Halong (in the top left corner). Taken earlier this week; storm intensities have since changed. (Source: NASA)

The first, typhoon Halong (formerly super typhoon, talked about in last week’s EIWN), is closing in on Japan’s main islands and is forecast to make landfall later this afternoon. Shikoku will be hardest hit; here Halong will make landfall with sustained winds of 120km/h – the equivalent of a category one hurricane.

The second is super typhoon Genevieve. This storm is unusual in such that it was formerly known as hurricane Genevieve – it has since crossed the International Dateline and is now classified as a typhoon. This is the first tropical cyclone to have done this since 2006. Thankfully Genevieve is in the middle of the Pacific and is not expected to make landfall any time soon.

Hurricane Julio is the third tropical cyclone in the Pacific. This one is forecast to pass just north of the Hawaiian Islands. The outer bands of the hurricane are still expected to affect the islands by bringing heavy rains to the now-saturated soils of Hawaii – soils saturated courtesy of the next storm: Iselle.

Tropical storm Iselle is the fourth and has had the biggest impact on American soils. The tropical storm made landfall on the Big Island of Hawaii yesterday and brought with it high end tropical storm force winds combined with copious amounts of rain (over 100mm). Interestingly enough, this is the first time a tropical storm has hit Hawaii since 1992 and the first time since 1952 that one has made landfall on the Big Island. Recovery efforts are still underway with a significant amount of damage to trees and homes on the island. Thankfully, this storm has not been responsible for any injuries or deaths so far.

Elsewhere in Weather News: August 2nd, 2014

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Weak Storm Forms in the Atlantic; Typhoon in Pacific

The second named storm of the Atlantic hurricane season spun up this past week and is still churning in the Caribbean. Tropical storm Bertha had sustained winds of around 80km/h as of Friday evening but had lots of dry air to its south and was not very well organized. By this evening it is expected continue its northwest track and pass between Puerto Rico and the Dominican Republic, bringing with it heavy rains as its primary threat. As much as 250mm of rain can be expected in the area which is a cause for concern in the mountainous regions. However, Puerto Rico has been experiencing drought for the past few months; the rain in the forecast is actually a welcome sight. On Sunday Bertha will have more of a northward track, curving up the Gulf Coast and likely dying off to the west of Bermuda due to cooler sea surface temperatures. None of the weather models show Bertha strengthening into a major hurricane and the US mainland is not expected to be impacted by this storm.

A large, more dangerous tropical disturbance has formed in the western Pacific this week and is already of category three status with sustained winds of 185km/h. Halong has a well-defined eye and eyewall in place, the only thing currently interfering with its development is some dry air to its north. The typhoon is currently located well east of the Philippines and is expected to be of no threat to the country as it will quickly curve Poleward this weekend. It, however, could pose a significant threat to Japan and China next week as it moves into the East China Sea as a strong typhoon. The islands of Okinawa could be in for a strong storm, as depicted by some models, but it is really too early to say for sure.

Typhoon Halong could become a super typhoon if it continues to strengthen at the rate it has been going. IR image taken Friday night.(Source: CIMSS)
Typhoon Halong could become a super typhoon if it continues to strengthen at the rate it has been going. IR image taken Friday night.(Source: CIMSS)

Elsewhere in Weather News: July 26th, 2014

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Saskatchewan Chase July 24th

An unusually strong upper level low for this time of the year nosed into the southern Prairies and was the focus for severe storms last Thursday. All the ingredients were present for severe storms that day, as Brad alluded to in his discussion of the event posted on the day of. Keeping in mind that this might be one of the last chases this season, due to the jet stream slacking up, a few of us made our way into Saskatchewan to chase the storms.

The day was off to somewhat of a surprising start as we woke up early to find a large squall line was sweeping across southeast Saskatchewan, southwest Manitoba and North Dakota. Thankfully, as the squall line moved away from the main instability axis in the morning it started weakening and its leftover cloud wouldn’t hamper our chances in Saskatchewan for the surface based storm development in the afternoon. After determining that skies would clear in the south-central part of Saskatchewan by late morning, the chase was on. From Winnipeg we drove straight to Brandon, grabbed a quick bite to eat and from there made our way to Weyburn, SK. After arriving in the mid-afternoon, we took a quick look at the satellite only to see some bubbling cumulus and even towering cumulus well to our southwest. By then it was obvious that nothing would fire in the Weyburn area with a stout cap present and no trigger around.

We then had to make a decision to either call it a day or head to south-central SK – where there was plenty of upper forcing and a cold front in the region (further west than what the models were showing). Since we were already that far into SK, we went all in and drove a good 100km west to the Assiniboia region. By the time we got there a couple supercells had already fired; we picked the one that looked best (just south of Assiniboia) and stuck to it.

Picture of the storm as it matured, looking towards a section that was bowing out, with a good shelf cloud. (Source: Matt)
Picture of the storm as it matured, looking towards a section that was bowing out, with a well-defined shelf cloud. (Source: Matt)

Following it for over two hours, we were able to spot two funnel clouds. One may have touched the ground, but we were too far away to tell (hence lack of pictures) while the other a brief funnel that spun up later in the evening on the leading edge of a bow echo. We followed the storm which evolved into a line with multiple bow echos embedded along it. Later in the evening the line became elevated, eliminating the wind threat but still able to produce a lot of cloud to ground lightning. The complex eventually died off in southwest Manitoba and left a large area of stratiform rain in the area.

Overall it turned out to be a fun chase day, with a storm that teased us with a few funnel clouds, combined with good structure and a nice light show. What we didn’t see from that day were the large hailstones that were later reported as well as strong wind gusts of 119km/h reported in Assiniboia.

Elsewhere in Weather News: July 19th, 2014

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Another Super Typhoon Spins Up in the Western Pacific

The Western Pacific Ocean has been very active in the past few weeks, churning up numerous typhoons including its most recent – super typhoon Rammasun. Rammasun made landfall at least twice; once in the Philippines and China, respectively, during its trek across the Western Pacific.

The first landfall occurred southeast of Manila, Philippines, where it brought with it winds of 185km/h. Many precautions were taken ahead of this storm in the Philippines as it was the first typhoon to hit the country since super typhoon Haiyan. Over 500,000 people decided to ride out the storm in evacuation centres and plenty of warning (3 days) was given to residents before the typhoon made landfall. Despite the warnings, many homes could not be saved – as many as 7,000 as reported by authorities. Unfortunately 38 people died due to the typhoon in the Philippines.

After making landfall in the Philippines, Rammasun quickly strengthened with help from the very warm sea surface temperatures (SSTs) that approached 30°C in the South China Sea. With these warm SSTs conditions were primed for the storm to reorganize. Rammasun quickly developed a well-defined eye and became a super typhoon (category 4) as it approached China for a second landfall. The typhoon made landfall on Friday morning with sustained winds of 250km/h gusting to 280km/h on one of China’s southern provinces; Hainan. All modes of damage were possible with a storm of this intensity; including flooding rains, landslides and severe storm surge. It is still unclear how the region is doing in the aftermath of the storm as of Friday night. A report of 178mm of rain in the coastal city of Haikou (pop. 900,000) in 6 hours on Friday combined with expected storm surges of 20 feet in the general area made for big flooding/landslide concerns. Rammasun is expected make a turn for China’s mainland and die off this weekend, but not before bringing widespread torrential rains to the region.

IR image of Rammasun just before it made its second landfall. (Source: NASA/NOAA)
IR image of Rammasun just before it made its second landfall. (Source: NASA/NOAA)

More tropical storms are expected to spin up this week with possibilities in both the Atlantic and Western Pacific as depicted by some models. The strength or paths of these are uncertain.