FPCN39 CWLW 091400
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 JULY 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      20   16     900   2     82   31    3200   4
KAMLOOPS     KEL      20   16     900   2     82   30    3350   4
OKANAGAN     KEL      20   16     900   2     82   30    3350   4
CASTLEGAR    SPOK     15   15    1000   4    100   30    3500   9
CRANBROOK    SPOK     13   14     900   4    100   26    3950  10
REVELSTOKE   KEL      12   14     800   3     82   26    3450   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
PENTICTON    VR   5   S   11   S   17
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: GOOD EXCEPT POOR UNTIL MID MORNING.




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.     25   14     800   5    100   26    3950  10
PR. GEORGE   P.G.     20   13     700   5    100   25    3700  11
SMITHERS     P.G.     15   12     600   3     77   23    2050   7
WELLS GRAY   P.G.     20   13     700   5    100   28    4000  10
FT NLSN      F.N.     13   16     500   3    100   27    3400  14
FT STJOHN    F.N.     20   17     500   8    100   26    3700  16

*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            S   11   SW  20
SMITHERS              S   17   S   20

TODAY'S VENTING: GOOD EXCEPT POOR UNTIL MID MORNING.




VENTING FOR SATURDAY: FAIR TO GOOD.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      5   16     150   2     31   23     800   3
FRASER VLY   QUIL      8   18     200   2     76   30    1850   6
SRN VRISL    QUIL      5   15     130   2     33   24     800   3
CNTRL VRISL  QUIL      6   15     150   2     38   25     900   4
NRN VRISL    HRDY      4   11     180   1     22   19     450   3
TERRACE      ANT       8   14     200   2    100   21    1950  17
STEWART      ANT       9   15     200   1     86   21    1500   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
VANCOUVER    SE  11   S   15   S   20
PORT HARDY   VR   5   S   26   S   35
SANDSPIT     S   39   S   50   S   56

TODAY'S VENTING: POOR THIS MORNING. BECOMING GOOD THIS AFTERNOON
NORTH COAST. REMAINING POOR THIS AFTERNOON NEAR THE OCEAN SOUTH
COAST BUT BECOMING GOOD BY LATE AFTERNOON OVER INLAND AREAS WHERE
TEMPERATURES CLIMB INTO THE UPPER TWENTIES.




VENTING FOR SATURDAY: FAIR TO GOOD.




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

END/TS
$$$$^^