FPCN39 CWLW 091317
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT FRIDAY 9 APRIL 1999 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      32    6     650   6    100   13    3200   8
KAMLOOPS     KEL      90    6    2150   8    100   13    3350   8
OKANAGAN     KEL      90    6    2150   8    100   13    3350   8
CASTLEGAR    SPOK     76    6    1250  13    100   11    3500  15
CRANBROOK    SPOK    100    4    2250  14    100   10    3950  15
REVELSTOKE   KEL      95    6    2450   8    100   10    3450   8

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   22   W   33
CRANBROOK             W   11   W   22

TODAY'S VENTING:  GOOD

VENTING FOR SATURDAY: GOOD




CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.    100    0    2600  12    100    8    3950  12
PR. GEORGE   P.G.     71    1    1550  10    100    8    3700  11
SMITHERS     P.G.     28    1     900   5    100    7    3500   9
WELLS GRAY   P.G.    100    0    2600  12    100    8    4000  12
FT NLSN      F.N.     58   -5    1200   8     83   -1    1950   8
FT STJOHN    F.N.     85   -2    2200   8    100    2    2750   9

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  20   W   26
SMITHERS              S   17   S   26

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     94    6    1250  13    100   10    2600  15
FRASER VLY   QUIL     88    6    1100  13    100   10    2550  15
SRN VRISL    QUIL     43    5     500   8    100   11    2750  14
CNTRL VRISL  QUIL     44    5     550   8    100   10    2500  14
NRN VRISL    HRDY     46    4     550   8    100    8    1950  14
TERRACE      ANT       9    2     200  12    100    7    2350  15
STEWART      ANT       9    3       0   6    100    7    1900  13

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   SW  28   SW  30
PORT HARDY   S   52   S   65   S   54
SANDSPIT     SW  20   S   28   S   52

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD




VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


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