FPCN39 CWLW 191419
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 PST FRIDAY 19 FEBRUARY 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       9    3     500   0    100    6    2550  20
KAMLOOPS     KEL      19    3     750   3    100    5    2550  13
OKANAGAN     KEL      19    3     750   3    100    6    2550  14
CASTLEGAR    SPOK      9    2     500  14    100    4    2900  15
CRANBROOK    SPOK     10    0     950  26    100    2    2650  16
REVELSTOKE   KEL       9    1     550   0     58    3    1200  10

*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   13   W   30   W   50
CRANBROOK             W   19   W   48

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.

VENTING FOR SATURDAY: POOR TO FAIR.




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.     49    0    1800   6     92    2    2450  10
PR. GEORGE   P.G.      9   -1     700   1     34    1    1400   4
SMITHERS     P.G.      9   -4     500   0     34    0    1250   4
WELLS GRAY   P.G.      9   -2    1000   1     93    2    2600   9
FT NLSN      F.N.      9   -9     400   6     22   -7     600   6
FT STJOHN    F.N.      9   -8     700   6      9   -5     700   6

*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            W   35   W   39
SMITHERS              SW  26   SW  39

TODAY'S VENTING: GOOD THIS AFTERNOON IN THE SOUTH TO POOR IN THE
NORTH.

VENTING FOR SATURDAY: POOR TO FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    6     100  11    100    8    1500  17
FRASER VLY   QUIL      9    6      50  11    100    8    1450  17
SRN VRISL    QUIL      9    5       0   8    100    9    1600  16
CNTRL VRISL  QUIL      9    5      50   8    100    7    1550  15
NRN VRISL    HRDY     19    4     150   8    100    7    1150  16
TERRACE      ANT       9    0     250   7      9    2     250   7
STEWART      ANT       9    0     150   5      9    2       0   4

*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    S   20   SW  30   SW  31
PORT HARDY   S   46   S   59   S   52
SANDSPIT     S   33   S   33   S   31

TODAY'S VENTING: GOOD EXCEPT POOR IN THE NORTH.

VENTING FOR SATURDAY: FAIR




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


END/JDG