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Table de Ratio EAU/NEIGE


Stockd3vil

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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).

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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

Edited by Stockd3vil
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Finalement la dernier facon de calculer

 

http://i30.photobucket.com/albums/c326/stockd3vil/MB.jpg

 

Voici une exemple

 

http://i30.photobucket.com/albums/c326/stockd3vil/meteogram.jpg

 

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

Edited by Stockd3vil
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