hurricane – Photography, aviation and flight simulation

Active Sky Next (ASN)

The weather engine ASN (Active Sky Next), like FSGRW, OpusFSI or REX updates the weather by downloading the latest information from the internet. There is also a possibility to use historical data (up to two years back).

ASN, FSGRW and OpusFSI use the default FSX cloud texture sets. So those weather engines can benefit from additional cloud texture sets (from REX for example) for a better visual depiction.

The cloud locations and coverage are accurate as well as realist. Thick overcast layers can be displayed. The cloud transitions are smooth, as well as the vertical variations in temperature, wind speed and wind direction.

Cloud-based effects include in-cloud reduced visibility, related turbulence (in cloud or when entering or exiting a cloud formation), accurate position of precipitation according to the type of clouds and to your position relative to the cloud formation.

Microbursts, wind shears, hail, turbulence as well as updrafts and downdrafts effects are modelled for thunderstorms. There are aural wind shear alerts when flying through a thunderstorm cell: That will nonetheless not be of great help if you attempt to cross a strong thunderstorm as, like in real life, you might not succeed…

You can use the radar to navigate through bad weather since radar and cloud positions are synchronized. The radar shows the intensity of precipitations as well as the echo tops.

Voiced warnings will be triggered when new Airmets and Sigmets are issued. They cover the world and can be viewed on a map. Associated icing and turbulence are added according to the warnings.

In flight, you can receive voiced weather updates through ATIS, FlightWatch or FSS.

ASN corrects the problems sometimes associated with low-level clouds, like inaccurate coverage and wrong position of the clouds, or layers that are really too thin.

Like with other weather engines, there is a flight planning mode. You can enter, import, or build a flight plan, as well as change the flight plan and waypoints at any time before or during a flight.

The weather, airports and navaids are displayed and can be edited, added or erased. The forecasts are available through graphics or text. If, along your route, there is no Metar issued for few hours, the engine will use the forecast to update the weather.

The thermals are modeled using the temperature and surface of terrain.

The wake turbulence trails are visible and, like in real life, are moving with the wind.

ASN does not rely only on interpolation to cover the oceanic areas and other territories where there are few weather stations.

The developers of ASN say that they have created a realistic hurricane simulation based on actual hurricane data. Their program would automatically disregard the ground data that seems incorrect. I cannot comment about the realism of that simulation since I have not tried it yet. But if it is correctly modelled, this function should interest whoever wants to experiment what it is to fly in or near a hurricane.

ASN is compatible with FSX, FSX: SE and the P3D versions up to P3DV4. It can support a multi-monitor setup.

I am not listing all the characteristics of this interesting software since there are always new options added. If you want more details, I provided the link below. Like with all the other weather engines, take the time to see what each has to offer since they have quite different features and spectrum of options.

Here is the link: Active Sky Next

For more weather engines, click on the following link: Other weather engines

For more articles on flight simulation on my web site, click on the following link : Flight simulation

A Man, a Time and the Deadliest Hurricane in History

The book recounts the events surrounding a disaster caused by a major hurricane having taken place in the United States in 1900. The author ensures that the scientific notions connected with meteorology are explained in a simple manner, knowing very well that a big part of his readership has only elementary knowledge on the subject.

I appreciated the way the events were told, since Erik Larson’s book is not limited only to human or material disaster which ensued from the passage of the hurricane on Galveston and the surrounding cities. The reader can learn about the development of Meteorological Offices in the United States, the equipment used at that time as much as the help brought by ship captains with regards to weather observations. It is also interesting to read about all the political and commercial pressures felt by some staff of the US Weather Bureau.

The Galveston disaster was not due to the malfunction of the meteorological instruments nor their limitation. It was rather caused by the disproportionate egos of the forecaster Isaac Cline and some of his managers, as well as pressures of all kinds on Isaac as an observer and forecaster.

Isaac Cline: a disproportionate ego

Isaac had acquired an excellent reputation throughout the years. Little by little, his scientific approach gave way to a certainty of always being right and the desire to be perceived as the leading expert in the field of meteorology. In one of his papers, he refutes openly one hundred years of accumulated knowledge in meteorology.

The Galveston population had asked for a breakwater to be built in order to limit the potential damages caused by a major hurricane. But Isaac wrote an article in which he explained why Galveston was not susceptible to suffer the effects of a major hurricane. The breakwater not being seen any more as a pressing project, the idea of its construction was abandoned.

An ego bigger than nature from some administrators of the US WEATHER BUREAU

On the island of Cuba, in 1900, there were American observers working for the US WEATHER BUREAU and Cuban observers monitoring the weather for their own country. The Cubans, as natural residents of the island, had gradually acquired a huge experience in the prediction of the passage and the trajectory of major meteorological systems. Powerful countries having a natural tendency to underestimate the capacities and experience of inhabitants of smallest nations, warnings coming from the Cubans were regularly brushed aside.

If the US WEATHER BUREAU had been attuned to the Cuban weather observer comments in 1900, the terrible hurricane which destroyed Galveston would have had much less tragic consequences. But, in the “Isaac storm” book, we learn that the communication links were voluntarily cut between both countries by the US WEATHER BUREAU. The Cuban forecasters were considered like poor inhabitants capable of announcing a storm only when it had practically left the island.

“The same day that the Weather Bureau published in the newspaper of Havana that the last hurricane had reached the Atlantic, the Belen Observatory (Cuba) said in the same papers that the center had crossed the eastern portion of the island and that it would undoubtedly reach Texas. A few hours later the first telegraphic announcement of the ravages of the cyclone in Galveston was received”. Six days after the Galveston disaster, the War Department revoked the ban on Cuban weather cables and the communication of information was re-established.

Of pressures exercised by the Galveston businessmen on the forecaster and weather observer Isaac Cline

A first type of pressure on the observer was of commercial order: there was a competition between Houston and Galveston to determine which of both cities would become the major commercial center in the South of Texas. Galveston was however more vulnerable to hurricanes, because it is an island while Houston is farther away inland. Isaac Cline, the observer and forecaster based in Galveston, minimized the chances that his city could suffer the devastating effects of a major hurricane. It was out of question to depreciate Galveston in the eyes of potential investors.

Of strong pressures exercised by administrators of the US WEATHER BUREAU on the forecaster and weather observer

Another type of pressure on the observer resulted directly from Isaac’s managers, in the US WEATHER BUREAU. At the time, weather forecasts were only at an elementary stage and the US WEATHER BUREAU wanted to avoid alarming the population by using words like “hurricane”. They did not want to be the laughing stock of the population if the famous hurricane announced ended up to be only a standard storm. Isaac knew that his role consisted in delaying as much as possible the use of the word “hurricane”. Not wanting to go against the orders and to preserve his reputation with the Bureau, he possibly convinced himself that there was no major meteorological system approaching Galveston. He even told the population to stay put.

Galveston has always suffered and still does from an unfavorable geographical position. The hot waters in the Gulf of Mexico have always been an essential ingredient in the recipe of a major hurricane. This is where a storm will draw much of its energy. But, in the 1900 disaster, Galveston was also a victim of the combination of disproportionate egos, lack of judgment and commercial and political pressures exercised on the forecaster and the observer. All in all, approximately 10,000 people died in Galveston while thousands of others suffered the same fate in the surrounding cities.

If the population had been informed correctly, damage to property would nevertheless have been extremely important, but the losses of life would have been negligible.