FPCN39 CWLW 131412
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 SATURDAY 13 MARCH 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      17    7     550   2     32   10    1400   2

KAMLOOPS     KEL      22    7    1000   2     31    9    1550   2

OKANAGAN     KEL      13    5     550   2     28    8    1350   2

CASTLEGAR    SPOK      9    4     500   5      9    6     500   5

CRANBROOK    SPOK     10    4     950  17    100    7    1950  18

REVELSTOKE   KEL      10    3     500   2     11    4     550   2


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   SW  30   SW  65
CRANBROOK             SW  22   SW  67

TODAY'S VENTING: POOR EXCEPT GOOD SOUTHEAST.




VENTING FOR SUNDAY: POOR




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.     89    4    2050  12    100    6    2500  22

PR. GEORGE   P.G.      9    2     700   2     53    4    1600   6

SMITHERS     P.G.      9    0     500   0     43    5    1450   4

WELLS GRAY   P.G.     ##   ##     ###  ##    100    7    4000  26

FT NLSN      F.N.      9   -2     450   0      9    3     800   0

FT STJOHN    F.N.      9   -1     700   1      9    3     700   1


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  43   S   61
SMITHERS              W   20   W   61

TODAY'S VENTING: FAIR TO GOOD EXCEPT POOR NORTHEAST.




VENTING FOR SUNDAY: POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    7     100  28     74    9     400  28

FRASER VLY   QUIL      9    7      50  28     72    9     400  28

SRN VRISL    QUIL     48    9     300  16     65   10     500  16

CNTRL VRISL  QUIL      9    6      50   4     54    8     650   9

NRN VRISL    HRDY     16    5     500   1     58    7    1050   6

TERRACE      ANT      10    2     250  12    100    4    1650  13

STEWART      ANT      ##   ##     ###  ##     35    4     550   5


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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   17   W   28   SW  43
PORT HARDY   W   19   SW  20   SW  28
SANDSPIT     W   15   W   19   SW  19

TODAY'S VENTING: FAIR TO GOOD.




VENTING FOR SUNDAY: POOR TO FAIR.




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


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