Friday, November 24, 2017

Severe weather alerts Nov. 25th and 26th 2017

Latest water vapour satellite image.
A vigorous Atlantic depression of about 1000hPa has formed WNW of the Canary Islands and is slowly moving closer, while a large anticyclone is almost stationary over North Africa. The resulting southerly airstream is drawing subtropical and very humid air from near the Cape Verde Islands. Current models and predictions are for heavy showers and at times persistent precipitation to affect the western Canary Islands, including La Gomera, and for gale force southerly winds. Thunderstorms can also be expected as the very active cold fronts associated with the low pressure system clash with the warm subtropical air. The Spanish meteorological service has issued 'yellow' wind and rain warnings for La Gomera and even status 'orange' warnings for the islands of La Palma and El Hierro, all warnings valid from midnight tonight until Sunday night. (see 'Weather' on top sidebar, which I will try to keep updated regularly). An 'orange' rainfall warning for La Gomera has been added for the first half of Sunday, with amounts of up to 30 mm in one hour and 100 mm over the 12 hour period of this additional warning. A 'yellow' warning of thunderstorms for Saturday and Sunday over La Gomera was also just issued. For Tenerife 'yellow' warnings for wind have will be activated for Sat. and Sun. and a 'yellow' rainfall warning just for Sunday.
The whole situation is a bit difficult to predict as the high pressure over North Africa may
ultimately decide who gets what, if anything, in the Canaries. 
Alerta Maxima (click)
But you have been warned...
Rockfalls and landslides can be expected, especially with rain combined with strong winds after the prolonged drought. Roads may also be slippery when the dust dissolves during the first rainfalls. Be extremely cautious and avoid unnecessary journeys, walks, etc....
Update: The government of the Canary Islands has increased the alert level to the highest (Alerta Maxima) for rainfalls on the islands of El Hierro, La Palma, and La Gomera from midnight tonight until further notice. Emergency crews will be on standby and other measures, like the closure of the path from
Valle Gran Rey under the cliff to Argaga, have been taken.
+ UPDATE: Alert cancelation see 'Weather' on sidebar

No comments :