FPCN39 CWLW 211400
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 21 MAY 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      76   16    1750   6    100   21    2300  20
KAMLOOPS     KEL      66   14    1550   6    100   21    2350  15
OKANAGAN     KEL      65   14    1550   6     80   21    2350   7
CASTLEGAR    SPOK     55   14    1050  11     80   21    2500   7
CRANBROOK    SPOK    100   13    3950  12    100   19    2950  12
REVELSTOKE   KEL      61   13    1550   6    100   19    2450  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    VR   5   W   17   W   24
CRANBROOK             W   11   W   28

TODAY'S VENTING: GOOD BY THIS AFTERNOON.

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.    100   10    2600  13    100   15    3950  13
PR. GEORGE   P.G.     64   10    1650   8    100   14    2850  11
SMITHERS     P.G.     23    9     900   4    100   14    2550  10
WELLS GRAY   P.G.    100    8    2700  13    100   15    4000  13
FT NLSN      F.N.      9   11     400   4     94   16    2550   7
FT STJOHN    F.N.     70   11    1700   8    100   16    3700   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
PR. GEORGE            SW  20   W   33
SMITHERS              SW  33   SW  33

TODAY'S VENTING: GOOD BY THIS AFTERNOON.

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     99   14    1650  11     70   17    1200  11
FRASER VLY   QUIL     97   13    1550  11     90   17    1450  11
SRN VRISL    QUIL     48   11     700   7     70   16    1200  10
CNTRL VRISL  QUIL     75   12    1200   8     70   16    1200  10
NRN VRISL    HRDY     50   11     500  10     90   14    1450  14
TERRACE      ANT     100    9    1100  31    100   12    1750  21
STEWART      ANT      94    9     700  22    100   12    1300  21

*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    VR   5   SW  19   SW  30
PORT HARDY   S   37   S   41   SW  31
SANDSPIT     SW  33   SW  33   SW  43

TODAY'S VENTING: GOOD.

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/JDG
$$$$^^