Composite radar de temps violent pour le QC

[Jean-François]

Le CMC (centre météorologique canadien) produit des cartes de temps violent basé sur les observations des Radars. Je viens de mettre en place le transfert de ces images sur un site publique: http://people.sca.uqam.ca/~caron/cartes/ (voir liens appropriés sur la page) pour le bénifice de tous.

 

Voici comment les critères sont déterminés (extrait de la doc interne):

 

*Severe Weather Product*

The Severe Weather Algorithm is based on an analysis of the three dimensional

volume scan data. The basic concept is that high reflectivities (> 45

dBZ) that occur high up in the thunderstorm (~> 10 km) are correlated to

severe weather. Tom Nichols was the originator of this product and is based

on some work by Ralph Donaldson of Air Force Geophysical Labs/NSSL in

the sixties. The algorithm is that when reflectivies greater than the threshold

value is detected above a threshold altitude value, the geographical location

is given a code value. The code value range from 1 through 4. The higher

the value, the more severe the weather. The intended output is an image is

generally very sparse. The current Severe Weather Threshold Table values are:

 

Severe Weather Level | Height Threshold (km) | dBZ Threshold (dBZ)

......... 1 ............... | .......... 5.5 ............... | .......... 45

......... 2 ............... | .......... 8.5 ............... | .......... 45

......... 3 ............... | ........ 10.5 ............... | .......... 45

......... 4 ............... | ........ 12.0 ............... | .......... 45

 

En exemple, la carte associés aux orages de ce matin

[marcrem]

Et il y a du mauve dans la cellule au sud de MTL

[Jean-François]

Et il y a du mauve dans la cellule au sud de MTL

Effectivement ! Je me demandais justement si le niveau 4 était atteignable au Québec. Quel timing