FPCN39 CWLW 251400
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 25 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   SPOK     60   15     600  17    100   19    2000  25
KAMLOOPS     SPOK     30   15     600   5    100   19    2000  10
OKANAGAN     SPOK     30   15     600   5    100   19    2000  10
CASTLEGAR    SPOK     30   14     800   5    100   17    2000  10
CRANBROOK    SPOK     30   13    1200   5    100   16    2000  10
REVELSTOKE   KEL      30   14     800   5    100   16    2000  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   17   W   30   NW  43
CRANBROOK             VR   5   NW  15

TODAY'S VENTING: POOR TO FAIR BECOMING GOOD THIS AFTERNOON.

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.     10   12     950  18    100   16    2800  13
PR. GEORGE   P.G.     76   15    1500  13    100   19    3700  12
SMITHERS     P.G.     20   14     800   4    100   20    2750  10
WELLS GRAY   P.G.     ##   ##     ###  ##    100   18    4000  13
FT NLSN      F.N.     16   13     550   4    100   21    3400   7
FT STJOHN    F.N.      9   11     700   3    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            N   13   N   15
SMITHERS              NW  19   NW  15

TODAY'S VENTING: POOR TO FAIR BECOMING GOOD THIS AFTERNOON.


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     98   15    1200  15    100   19    2100  13
FRASER VLY   QUIL     87   14     950  15    100   17    1600  13
SRN VRISL    QUIL     92   15    1100  14    100   18    1750  13
CNTRL VRISL  QUIL     92   15    1100  14    100   19    2000  12
NRN VRISL    HRDY     ##   ##     ###  ##     83   15    1200  10
TERRACE      ANT      45   16     700   9    100   22    2700   7
STEWART      ANT      32   15     350   7     92   22    2100   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
VANCOUVER    W   28   W   30   W   31
PORT HARDY   W   22   NW  24   NW  19
SANDSPIT     NW  19   W   15   W   15

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.




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

END/MWSO
$$$$^^