#Paraguay A nighttime tornado touched down last night in Villarrica, in the Estación neighborhood, Guairá department.
#Spain The strong wind begins to blow in the interior of the southeast of the Iberian Peninsula due to the arrival of the storm Ciarán. Wind gusts already touching 100 km/h. Images from #Cehegín (#Murcia).
A tornado touched down last night and caused damage in Jersey, Channel Islands in the midst of storm Ciarán.#StormCiaran @WxNB_
Dammam, Saudi Arabia (Nov 2, 2023) Hail.
Storm #Ciaran has brought hurricane force winds, heavy rain and dangerous surf to several parts of Europe.
As if that wasn't enough already if monitoring a new storm named #Sunday.
@ECMWF graphic via @AEMET_Esp
Via @WMO
Strong #storm hitting #Bahrain, country in the Persian Gulf.
Rescue operation underway in Samburu, #Kenya as flash flooding continues in the region. This is at Learat river where a lorry was swept away....
Here's the path of storm Ciaran over the last 24 hrs (9pm, 01/11 - 9pm, 02/11) at 8hr intervals. Notice how Ciaran has moved through the channel between France and England, maintaining itself over the water, which is more electrically conductive. If it had made landfall, it would have been dissipating much faster.
This is absolutely insane!!! SERIOUS flooding now in Figline di Prato north of Florence in #Italy
The Bisenzio river has overflowed in Campi in Tuscany. Really serious situation unfolding in #Italy....
Some storms from the pages of history, older and newer:European windstorms are powerful extratropical cyclones which form as cyclonic windstorms associated with areas of low atmospheric pressure. They can occur throughout the year, but are most frequent between October and March, with peak intensity in the winter months.[1] Deep areas of low pressure are common over the North Atlantic, and occasionally start as nor'easters off the New England coast. They frequently track across the North Atlantic Ocean towards the north of Scotland and into the Norwegian Sea, which generally minimizes the impact to inland areas; however, if the track is further south, it may cause adverse weather conditions across Central Europe, Northern Europe and especially Western Europe. The countries most commonly affected include the United Kingdom, Ireland, the Netherlands, Norway, Germany, the Faroe Islands and Iceland.[2]
First storm formed | 25 September 2023 |
---|---|
Strongest storm1 | Ciarán 954 hPa (28.17 inHg) |
Strongest wind gust | Ciarán 207 km/h (129 mph): Pointe du Raz, France: 2 November 2023 |
Total storms | 6 |
Total fatalities | 20 + 1 missing |
Low pressure records in Europe1 Strongest storm is determined by lowest pressure and maximum recorded non-mountainous wind gust is also included for reference.
The formation of low pressure systems is called
- 13 January 1993 Braer Storm dropped 78 hPa in 24 hours,[64][296] to a central pressure out in the Atlantic at
62° N, 15° W of 914.0 hPa, and was likely the deepest cyclone on record for the North Atlantic, and very probably for any temperate latitude.[297]For comparison, the lowest Atlantic basin tropical cyclone low pressure is Hurricane Wilma in 2005, which holds the record at 882 hPa.[299](see list of most intense tropical cyclones in the North Atlantic).
- 14–15 December 1986, The British Meteorological Office assessed the centre of a depression at about 916 hPa, the West German Meteorological Service enclosed the depression with a 915 hPa isobar, indicating a pressure possibly as low as 912–913 hPa.[298]
If the formation is very rapid over a 24-hour period, one can have:Cyclogenesis is the development or strengthening of cyclonic circulation in the atmosphere (a low-pressure area).[1] Cyclogenesis is an umbrella term for at least three different processes, all of which result in the development of some sort of cyclone, and at any size from the microscale to the synoptic scale.
[...]
- Tropical cyclones form due to latent heat driven by significant thunderstorm activity, developing a warm core.
- Extratropical cyclones form as waves along weather fronts before occluding later in their life cycle as cold core cyclones.
- Mesocyclones form as warm core cyclones over land, and can lead to tornado formation. Waterspouts can also form from mesocyclones, but more often develop from environments of high instability and low vertical wind shear.
The anticyclonic equivalent, the process of formation of high-pressure areas, is anticyclogenesis.[3] The opposite of cyclogenesis is cyclolysis.
Explosive cyclogenesis (also referred to as a weather bomb,[1][2][3] meteorological bomb,[4] explosive development,[1] bomb cyclone,[5][6] or bombogenesis[7][8][9]) is the rapid deepening of an extratropical cyclonic low-pressure area. The change in pressure needed to classify something as explosive cyclogenesis is latitude dependent. For example, at 60° latitude, explosive cyclogenesis occurs if the central pressure decreases by 24 millibars (0.71 inHg) or more in 24 hours.[10][11] This is a predominantly maritime, winter event,[10][12] but also occurs in continental settings.[13][14] This process is the extratropical equivalent of the tropical rapid deepening.
The above statement needs a qualifier, because it turns out that European Windstorms do not need to be "Strong storms" to earn a name? A forecast of more than a wind force 8 is enough in some countries. And countries apparently do not even agree on how they define a mean wind speed measurement. Is it over two minutes or 10? At some stage in the post writing, I began to wonder if a climate change agenda influences how storms are talked about.Strong storms that hit Europe are called European Windstorms
Beaufort scale[9][10][11][12] Beaufort number | Description | Wind speed | Wave height |
0 | Calm | < 1 knot < 1 mph < 2 km/h < 0.5 m/s | 0 ft 0 m |
1 | Light air | 1–3 knots 1–3 mph 2–5 km/h 0.5–1.5 m/s | 0–1 ft 0–0.3 m |
2 | Light breeze | 4–6 knots 4–7 mph 6–11 km/h 1.6–3.3 m/s | 1–2 ft 0.3–0.6 m |
3 | Gentle breeze | 7–10 knots 8–12 mph 12–19 km/h 3.4–5.5 m/s | 2–4 ft 0.6–1.2 m |
4 | Moderate breeze | 11–16 knots 13–18 mph 20–28 km/h 5.5–7.9 m/s | 3.5–6 ft 1–2 m |
5 | Fresh breeze | 17–21 knots 19–24 mph 29–38 km/h 8–10.7 m/s | 6–10 ft 2–3 m |
6 | Strong breeze | 22–27 knots 25–31 mph 39–49 km/h 10.8–13.8 m/s | 9–13 ft 3–4 m |
7 | High wind, moderate gale, near gale | 28–33 knots 32–38 mph 50–61 km/h 13.9–17.1 m/s | 13–19 ft 4–5.5 m |
8 | Gale, fresh gale | 34–40 knots 39–46 mph 62–74 km/h 17.2–20.7 m/s | 18–25 ft 5.5–7.5 m |
9 | Strong/severe gale | 41–47 knots 47–54 mph 75–88 km/h 20.8–24.4 m/s | 23–32 ft 7–10 m |
10 | Storm,[13] whole gale | 48–55 knots 55–63 mph 89–102 km/h 24.5–28.4 m/s | 29–41 ft 9–12.5 m |
11 | Violent storm | 56–63 knots 64–72 mph 103–117 km/h 28.5–32.6 m/s | 37–52 ft 11.5–16 m |
12 | Hurricane-force[13] | ≥ 64 knots ≥ 73 mph ≥ 118 km/h ≥ 32.7 m/s | ≥ 46 ft ≥ 14 m |
Apart from the Fujita scale and the TORRO scale, there is also the Saffir-Simpson scale.The Beaufort scale was extended in 1946 when forces 13 to 17 were added.[3] However, forces 13 to 17 were intended to apply only to special cases, such as tropical cyclones. Nowadays, the extended scale is only used in Taiwan and mainland China, which are often affected by typhoons. Internationally, WMO Manual on Marine Meteorological Services (2012 edition) defined the Beaufort Scale only up to force 12 and there was no recommendation on the use of the extended scale.[6]
Wind speed on the 1946 Beaufort scale is based on the empirical relationship:[7]
where v is the equivalent wind speed at 10 metres above the sea surface and B is Beaufort scale number. For example, B = 9.5 is related to 24.5 m/s which is equal to the lower limit of "10 Beaufort". Using this formula the highest winds in hurricanes would be 23 in the scale. F1 tornadoes on the Fujita scale and T2 TORRO scale also begin roughly at the end of level 12 of the Beaufort scale, but are independent scales – although the TORRO scale wind values are based on the 3/2 power law relating wind velocity to Beaufort force.[8]
There was also in 2023–2024 European windstorm seasonIn 1946, by decision of the International Meteorological Organization, it was expanded again by 5 more levels to a total of 18 levels (including 0):[1]
Wind force 12: Wind speed: 64-71 kn or 118-133 km/h, instead of the previous 117 km/h
Wind force 13: Wind speed: 72-80 kn or 134-149 km/h
Wind force 14: Wind speed: 81-89 kn or 150-166 km/h
Wind force 15: Wind speed: 90-99 kn or 167-183 km/h
Wind force 16: Wind speed: 100-108 kn or 184-202 km/h
Wind force 17: Wind speed: ≧109 kn or ≧203 km/h
After the successor organization, the World Meteorological Organization, reduced the expanded Beaufort scale back to the traditional 12-part scale in 1970, the 18-part scale, which was expanded to include an additional wind force, is now only used in Taiwan and on the Chinese mainland, which is also repeatedly hit by such wind strengths used.[2]
Strongest wind gust | Ciarán 207 km/h (129 mph): Pointe du Raz, France: 2 |
---|
48–55 knots
55–63 mph
89–102 km/h
24.5–28.4 m/s
65 km/h is a gale/fresh gale, or wind force 8:There is no universal definition of what constitutes a windstorm in Europe, nor is there a universally accepted system of naming storms. For example, in the Western Group, consisting of the UK, Ireland, and the Netherlands, a storm is named if one of the meteorological agencies in those countries issues an orange warning (amber in the UK), which generally requires a likelihood of widespread sustained wind speeds greater than 65 km/h, or widespread wind gust speeds over 110 km/h. (Required wind speeds vary slightly by agency and by season.) Both the likelihood of impact and the potential severity of the system are considered when naming a storm.[2][3][4] The Southwest Group of Spain, Portugal, and France share a similar storm-naming scheme, though their names differ from those used by the Western Group.[5]
Over 110 km/h in widespread gust speeds, means frequent speed as found in a violent storm, or wind force 11:34–40 knots
39–46 mph
62–74 km/h
17.2–20.7 m/s
Next, the Wiki reads:56–63 knots
64–72 mph
103–117 km/h
28.5–32.6 m/s
This corresponds to a wind force 7, variously called a high wind, moderate gale, near galeIn Greece, however, naming criteria were established for storms when the storm's forecasted winds are above 50 km/h over land, with the wind expected to have a significant impact to infrastructures.[6]
A very different attitude is found next:28–33 knots
32–38 mph
50–61 km/h
13.9–17.1 m/s
The source they give does not confirm the claim, at least not in the updated version:
The German scientists name both highs and lowsStorms in Denmark since 1891. Updated 25 October, 2023. [...] Classification of storms are based on a climatological valuation, based on 10 minutes average wind speed.
Model or reality?The Meteorology Department of the Free University of Berlin (FUB) names all high and low pressure systems that affect Europe, though they do not assign names to any actual storms.[8] A windstorm that is associated with one of these pressure systems will at times be recognized by the name assigned to the associated pressure system by the FUB. Named windstorms that have been recognized by a European meteorological agency are described in this article.
Maybe good to keep in mind next time a storm is announced.Naming conventions used in Europe are generally based on conditions that are forecast, not conditions that have actually occurred, as public awareness and preparedness are often cited as the main purpose of the naming schemes–for example, a reference.[3] Therefore, an assignment of a storm name does not mean that a storm will actually develop.
The first expert they interview is a regional president, who speaks as he stole a line from Zelensky. Storm awareness and helping people who suffer is necessary, but why derail the possibility of meaningful discussions by ascribing it all to man driven climate change?Deadly flooding and 200kph winds: Did climate change fuel Storm Ciarán's record breaking weather?
We asked climate experts what impact climate change is having on European storms like Ciarán.
Tuscany has declared a state of emergency after at least five people were killed by flooding on Thursday (3 November) as Storm Ciarán hit Italy.
"What happened tonight in Tuscany has a clear name: climate change," Tuscany's regional president Eugenio Giana wrote on X, formerly known as Twitter.
"We must all work to counter it, without giving up in the face of other people's disinterest."
Above it was 10 minutes, which I also found on the page of the Danish Meteorological Institute, (DMI) but the English page about Wind gusts writes they count over two minutes. If they really changed it from a 10 minutes average to a 2-minute average, you will probably get a few more storms out of what was formerly not - though to push climate change, it will work better.The World Meteorological Organization has stipulated that the wind speed given in weather maps and station reports is the average of the last 10 minutes. The peak gusts of such an interval can be twice as strong and stronger, although there can also be moments of calm. These measurement regulations only apply to official or published measurements, but not to wind forecasts, for which the respective journalist can set their own political and economic rules.
The Metar reports can be found here: METAR, TAF and NOTAM decoder for all 67,758 airportsThe wind is measured using an anemometer or estimated with a windsock. The average value of wind speed is generally measured over a period of 2 minutes before the meteorological observation according to the World Meteorological Organization. Any significant variation at this mean wind during the ten minutes preceding the observation are noted as gusts in messages such as METAR.[3]
A difference of 9-10 knots corresponds to about 5 m/s and that is also how DMI define their gusts:It is generally reported in METAR when the peak wind speed reaches at least 16 knots and the variation in wind speed between the peaks and average wind is at least 9 to 10 knots.[1] [...] When the maximum speed exceeds the average speed by 10 to 15 knots, the term gusts is used while strong gusts is used for departure of 15 to 25 knots, and violent gusts when it exceeds 25 knots.[4]
An example would be a METAR report saying that the wind is coming from 280 degrees at 14 knots, but with gusts up to 24 knots and variable wind direction between 240 and 310. IT looks like this:If the deviation is 5 m/s or more from the mean wind, we call it a gust. A gust must last at least 3 seconds and must not last more than 1 minute.
Gusts are typical over land due to the turbulence that occurs when the wind encounters obstacles in the landscape; eg. hills, buildings and the like. In addition, gusts occur when the air is unstable and stronger winds from higher air layers strike the surface.
Many sites do not give a minimum for a gust, they just say it has to be less than 20 seconds, (less than 60 seconds for DMI) and none of the sites revealed what happens if it lasts longer, but less than what is required for a mean wind, be it two minutes as for the Americans and aligned or 10 minutes as for the Germans and aligned.METAR **** 041300Z AUTO 28014G26KT 240V310 9999 -RA SCT014/// BKN019/// BKN025/// //////TCU 13/11 Q0989 TEMPO 4000 RA BKN007 BECMG 16007KT
Images from La Rochelle on Saturday evening, where storm Domingos is in full swing. The city just recorded a gust of 121 km/h! (© Lucas Giraud)
Over 2,500 people have been forced to evacuate their homes in Mandera after heavy rainfall persisted for more than 36 hours, causing severe flooding that submerged houses and uprooted trees.
Sea storm captured today from the Croatian island of Brač
Tornado touches down in Silistra, Bulgaria (Nov 4, 2023)
Heavy #rain and #flooding continues in the Arabian Peninsula. So the storm today Sunday, November 5 in #Oma
Fujairah city in the United Arab Emirates today
Oman has been getting hammered today. This is in the state of Nakhal tonight....
Floods sweep away a vehicle in Taima of Saudi Arabia (05.11.2023)
Notice that while -150°F is required to flash-freeze a mammoth, a higher temperature could achieve the same result if sufficient wind was generated. This phenomenon is called ‘wind chill,’ as shown in the wind-chill table below. For example, an air temperature of -76°F combined with 55mph winds leads to a heat loss equivalent to -150°F, i.e. the temperature required to flash-freeze mammoths and other animals. While a -76°F temperature cannot be experienced at ground level in temperate regions, this is a fairly common occurrence not far above our heads:
As indicated in the below diagram, 90 km above our heads the average atmospheric temperature is -90°C.
At an altitude of 11 km,108 the average temperature is about -60C.
In Primorye in Lesozavodsk there was an icy rain.
Hundreds of trees fell in Primorye