4 réponses à ce sujet

[Stockd3vil]

Pour d'autre info http://www.meted.ucar.edu/norlat/snowdensi...om_mm_to_cm.pdf


Conversion Tables
Conversion tables based solely on surface temperature seem to be routinely used by meteorological observers to estimate snow measurements (when the water equivalent has been correctly measured but snow has been blown around by the wind), or water equivalent measurements (from the snow depth when snow did not enter the collector). The conversion table used by the NWS is shown below.
Surface temperature
Snow/water ratio
28-34 oF 10:1
20-27 oF 15:1
15-19 oF 20:1
10-14 oF 30:1
0-9 oF F 40:1
-20 to -1 oF 50:1
-40 to -21 oF 100:1

Table 21: Conversion table used by the NWS showing the relationship between surface temperatures and snow/water ratios. Source: DOC/NOAA/NWS (1996).

[Jean]

Merci pour l'information!

Dans le contexte actuel, c'est vraiment pertinent!

[Stockd3vil]

On peu aussi utilise cette formule.

1) If MAXTMP is greater than 271.16K, then the liquid equivalent ratio (RATIO) is 12.0 + 2.0*(271.16-MAXTMP)
2) If MAXTMP is less than 271.16K, then the liquid equivalent ratio (RATIO) is 12.0 + (271.16-MAXTMP)

E.g: Demain montreal -6 egal 267. Alors il faute prendre le deuxieme.

12+(271-267) =16:1

Ces il fasais -1 egal 272. on prendrais numero un.

12+2X(271-272), 12+-2= 10:1

Modifié par Stockd3vil, 14 décembre 2007 - 20:49.

[Stockd3vil]

Finalement la dernier facon de calculer



Voici une exemple



Alors le 42 et 48 heure ratio 12:1= 9mm x 1.2= 10.8 cm
la 54h ratio 15:1 = 16mm x 1.5 = 19.2cm
60 et 66h 20:1 = 8mm X 2 = 16cm

Total 46 cm

Modifié par Stockd3vil, 14 décembre 2007 - 22:43.

[Stockd3vil]