Via P Gosselin
Just as WHO changed the definition of “pandemic”, DWD changed the definition of “heat wave”… all to create the false impression of a crisis?
Repeat a lie often enough, and before long, the masses begin to believe it is the truth. Perhaps fewer organizations know this than Germany’s national weather service DWD.
To make people more confident that warming is happening, they must be led to believe that “heat waves” are happening more often. Although it’s not an unusually hot summer in Germany (yes, it’s hot at times), all we hear in the media is news of heat wave after wave. other hot weather.
To allow for this, it appears that DWD has changed its definition of a “heat wave” so that now any brief period of warm temperatures qualifies as one. What used to be defined as a period of 5 consecutive days with peak temperatures above 30°C, has been changed to a period of just three (!) consecutive days – with peaks from 28° C and above. That’s all it takes, guys! It’s really confusing how Florida can be so popular with retirees.
Hat head: Snowfan
What are these DWD writes at its website (excerpt):
A heat wave is periods of unusually high heat stress lasting several days. A heat wave is an extreme event can damage human health, ecosystems and infrastructure. In our latitudes, heat waves often occur associated with persistent high-pressure conditions in the summer (high-pressure areas).
Internationally, there is no uniform definition of the term heatwave. Definitions are often based on a combination of percentile-based thresholds (e.g. 98th percentile of maximum daily value and minimum duration, e.g. 3 days).
The following heatwave definition was used in the production of the “Climatic Map of Heatwaves” in the German Weather Service:
For each grid point separately, the threshold value for each day – corresponding to the 98th percentile – is calculated from the maximum daily temperature of reference period (1961-1990). To increase a database of 30 values (1961-1990), 15 days before and after the date are also used, which increases the database to 930 values and also results in smoothing. If the current grid value of the maximum temperature is higher than this climatic threshold and above 28°C for 3 consecutive days Or moreA heatwave is present for the area and the cycle is marked.
Heatwaves pose a major health risk, especially for the elderly and sick. For this reason, the German Weather Service uses its heat warning system to warn of days of high heat stress on the basis of perceived temperatures and a simulation model to calculate indoor heat stress. . “
It is unclear when DWD will change to this new low bar definition. The World Meteorological Organization defines a heatwave 5 consecutive days or more of prolonged heat, in which the daily maximum temperature is 5 °C (9 °F) or more above the mean maximum temperature.
But for DWD, a regular warm weekend in the summer – when it’s just warm enough for a comfortable swim during the day – is now considered “unusually high heat stress”. The result: the media followed and continued reporting on “another heatwave” almost weekly.
Heat wave after heat wave
If we take Berlin and apply the new definition of DWD to 1992, for example, the German capital in fact saw 7 heatwaves that summer: May 21-23, 2- June 5, June 27 – July 1, July 8-10, July 19 – July 21, July 30 – August 3 and August 5 – 10. However, back then the Germans were not bombarded by the media with reports of heat waves. It was then: it’s summer, stupid!
And note how DWD uses the ancient 1961-1990 reference period for comparison, a time when the average temperature was about a degree lower and all the discussion was about global cooling and the era. next glacial. This is the trick used to justify 28°C as “unusually high thermal stress”. Never mind that high-temperature days in the over-20s are often accompanied by nights of mid-teens that make people grab their coats.
Not a very hot summer
Anecdotally, this year I can say it has been a warm and pleasant summer here in North West Germany; it is definitely too dry. But I don’t think it’s “a burnout” because many evenings are just too good to sit outside without a jacket on. Moreover, there has not been a single night where I have had difficulty sleeping. And in the hot German summers before that, I remember having an electric fan running in the office for days. This summer I never had to use it once.
It’s a bit like the WHO changing its definition of “pandemic” so that authorities can now declare a crisis any time a storm breaks out.
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