FPCN39 CWLW 021416
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 2 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      19    7     700   2     45   14    1500   3

KAMLOOPS     KEL      15    5     650   2     48   13    1800   3

OKANAGAN     KEL       9    4     550   0     48   13    1800   3

CASTLEGAR    SPOK     20    5     800   4    100   13    2550  10

CRANBROOK    SPOK      9    1     950  10    100   10    3950  12

REVELSTOKE   KEL      13    4     650   2     36   11    1450   3


*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    VR   5   SW  17   SW  28
CRANBROOK             VR   5   SW  11

TODAY'S VENTING: POOR THIS MORNING. FAIR THIS AFTERNOON EXCEPT GOOD
SOUTHEAST.




VENTING FOR SATURDAY: FAIR TO 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.      9    3     950  26     81    7    1350  26

PR. GEORGE   P.G.     12    5     700  13     59    8    1100  16

SMITHERS     P.G.      9    3     500   2     21    6     700   8

WELLS GRAY   P.G.     ##   ##     ###  ##     86    7    1500  25

FT NLSN      F.N.      9    4     400   2      9    9     400   2

FT STJOHN    F.N.      9    5     700  10      9    7     700  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
PR. GEORGE            W   24   W   22
SMITHERS              W   28   W   22

TODAY'S VENTING: POOR BECOMING GOOD THIS AFTERNOON ABOVE
ABOUT 2000 METRES CENTRAL INTERIOR



VENTING FOR SATURDAY: FAIR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     54    7     700   9     65   11     850  10

FRASER VLY   QUIL     17    5     200   7     71   12     950  10

SRN VRISL    QUIL     18    6     200   5     57   11     800   8

CNTRL VRISL  QUIL     17    6     200   5     57   11     800   8

NRN VRISL    HRDY     12    6     100   4     21    7     250   6

TERRACE      ANT      81    4     900  16    100    6    1350  15

STEWART      ANT      ##   ##     ###  ##     80    6     800  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  17   SW  26   W   33
PORT HARDY   NW  35   NW  46   NW  43
SANDSPIT     W   41   W   48   W   48

TODAY'S VENTING: POOR BECOMING GOOD THIS AFTERNOON EXCEPT OVER
NORTHERN VANCOUVER ISLAND.




VENTING FOR SATURDAY: FAIR




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


END/TCS