FPCN39 CWLW 231400
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 23 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   SPOK    100   23     750  30    100   28    2050  30
KAMLOOPS     SPOK     36   22     750   7     65   28    2050  10
OKANAGAN     SPOK     35   20     750   7     65   28    2050  10
CASTLEGAR    SPOK     28   21     800   7    100   30    3500  16
CRANBROOK    SPOK     10   19     950  12    100   28    3950  18
REVELSTOKE   SPOK     29   16     750   7     31   22     800   7

*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   SW  33
CRANBROOK             SW  15   W   33

TODAY'S VENTING: GOOD LOCALLY POOR IN THE REVELSTOKE AREA

VENTING FOR SATURDAY: GOOD 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.    100   16    3950  28    100   20    3950  28
PR. GEORGE   P.G.     95   14    1600  18    100   20    3700  24
SMITHERS     P.G.     16   14     750   3    100   19    2750  20
WELLS GRAY   P.G.    100   16    3950  28    100   20    4000  28
FT NLSN      F.N.     63   14    1200   9    100   20    3000  15
FT STJOHN    F.N.    100   15    2250  15    100   20    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            W   24   W   30
SMITHERS              W   17   NW  30

TODAY'S VENTING: GOOD

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     56   18    1000   6     76   23    1500   7
FRASER VLY   QUIL     56   18    1000   6     94   25    1750   9
SRN VRISL    QUIL     53   18    1000   6     72   23    1400   6
CNTRL VRISL  QUIL     55   19    1050   6     72   23    1400   6
NRN VRISL    HRDY     33   14     450   6     80   17    1150  10
TERRACE      ANT      72   14    1600   7     89   17    2250   7
STEWART      ANT      41   14     700   5     82   17    2000   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
VANCOUVER    SW  11   W   22   W   35
PORT HARDY   NW  11   W   13   W   24
SANDSPIT     W   13   NW  19   NW  26

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: POOR TO FAIR

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

END/RET
$$$$^^