Most noteworthy severe weather events in Europe: a review – July 2017

A number of noteworthy severe weather events happened across Europe in July. Severe hailstorms were frequent, particularly in Spain, Italy and parts of southeastern Europe. Also, the coast of the Mediterranean burned in many places, including southern France, numerous locations in Italy and the eastern coast of the Adriatic sea in Croatia and Montenegro. Below is a compilation of some of the most outstanding severe weather events in July (click on the links to full reports):

JULY 10 VIENNA AIRPORT, AUSTRIA TORNADO

An exceptional stovepipe tornado formed near Vienna airport, Austria on a big isolated supercell thunderstorm on July 10. A favourable combination of instability, shear and a local surface low led to the development of the most photogenic tornado in Europe in July. No serious damage or injuries were reported with this event.


Vienna airport landing. Photo: Elisabeth Lobner.

JULY 11 HUNGARY SUPERCELLS

A couple of supercells formed over Slovenia and moved into W Hungary, entering into very favourable conditions and developing exceptional structure. Not particularly severe, although they produced hail up to approximately 4 cm across.



JULY 16-19 SPLIT, CROATIA WILDFIRES

Numerous wildfires hit the coastal Dalmatia and Makarska in Croatia between July 16 and 19. The largest and most dangerous blaze occurred along the outskirts of Split, the largest city in Dalmatia with some 180 000 inhabitants. The wildfire burned over 4000 hectares and burned homes in the suburbs of Split.






JULY 18 ISTANBUL, TURKEY FLASH FLOODS

Istanbul was hit by severe storms in July not once, but twice. The first storm on July 18 caused widespread flash flooding, with particular problems being reported across the metro network.





JULY 23 RUBIELOS, TERUEL, SPAIN HAILSTORM

Rubielos was hit by a severe hailstorm which produced hailstones up to ~8 cm across, making it one of the most severe hailstorms reported in Europe in July 2017.





LATE JULY WILDFIRES IN SOUTHERN FRANCE

A number of wildfires, some set intentionally, struck southern France between July 23 and 27. The largest blaze in Bormes les Mimosas (83) engulfed some 7000 hectares and prompted the evacuation of about 12 000 people.





JULY 26 PLOMIN, CROATIA HAILSTORM

A persistent, stationary hailstorm blanketed Plomin in Istra, NW Croatia in a thick blanket of hail. Locally hail accumulations were almost half a meter thick and the hail blanket was even visible from the air.

JULY 26 INTENSE FLASH FLOODS IN GOSLAR, HARZ, GERMANY

Intense flash floods hit Goslar (Harz, Germany) after locally up to 150-250 mm of rain fell in 48 hours on July 24-25.




JULY 27 ISTANBUL, TURKEY SEVERE THUNDERSTORM

Istanbul was hit by a severe supercell thunderstorm, producing torrential rainfall, flash flooding, severe downbursts and straight line winds and hail up to 9 cm in diameter. Widespread damage to buildings and cars was reported. Also, several airplanes were damaged by the hailstorm.



Some other noteworthy severe weather events in Europe in July 2017 include: severe thunderstorms across parts of Romania and Bulgaria on July 3, severe thunderstorms over north Italy on July 24-25, severe hailstorm in Grottamare, central Italy on July 25 and