FPCN39 CWLW 041400
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 4 JUNE 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      16   18     650   2     93   22    1650  10
KAMLOOPS     KEL      36   18     900   5    100   24    3350  10
OKANAGAN     KEL      36   18     900   5    100   24    3350  10
CASTLEGAR    SPOK     56   16    1150   9     76   23    1600   9
CRANBROOK    SPOK     53   14    1350  14    100   20    3950  15
REVELSTOKE   KEL       9   15     600   0    100   21    2250  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   20   W   30
CRANBROOK             W   11   W   22

TODAY'S VENTING: GOOD

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.    100   13    2950  19    100   17    3950  19
PR. GEORGE   P.G.    100   10    1600  22    100   15    2850  19
SMITHERS     P.G.     18    9     600  10    100   14    2550  17
WELLS GRAY   P.G.    100   13    2950  19    100   17    4000  19
FT NLSN      F.N.     61   12     850  15    100   17    3400  24
FT STJOHN    F.N.    100   12    2750  28    100   18    3700  27

*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            SW  33   SW  48
SMITHERS              S   43   SW  48

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     65   14     900   9     76   16    1050  10
FRASER VLY   QUIL     40   14     850   9    100   17    1150  15
SRN VRISL    QUIL     66   15     900   9     74   17    1100   9
CNTRL VRISL  QUIL     59   14     850   8     74   17    1100   9
NRN VRISL    HRDY     25   12     550   3     35   14     800   4
TERRACE      ANT      89   10    1700   9     92   13    1750   9
STEWART      ANT      80   10    1400   8     91   13    1700   8

*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  20   SW  30   W   37
PORT HARDY   S   56   SW  63   SW  57
SANDSPIT     SW  65   SW  74   SW  76

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

VENTING FOR SATURDAY: GOOD

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


END/RET
$$$$^^