FPCN39 CWLW 011400
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 THURSDAY 1 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      39   18     850   5     95   21    2050   8
KAMLOOPS     KEL      50   17    1150   6    100   22    3350  14
OKANAGAN     KEL      24   16     700   5    100   22    3350  14
CASTLEGAR    SPOK     34   16     900   7    100   22    2700  18
CRANBROOK    SPOK     76   14    1300  29    100   20    3950  30
REVELSTOKE   KEL      14   14     600   3     69   17    1650   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   17   W   19
CRANBROOK             W   13   W   31

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: 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.     48   10    1200  02     92   18    2600  05
PR. GEORGE   P.G.     44    8    1000  02     90   17    2500  05
SMITHERS     P.G.     22   12    1200   2     37   16    2100   2
WELLS GRAY   P.G.     47    8    1400  02     77   17    1700  07
FT NLSN      F.N.    100   12    3400  17    100   16    3400  17
FT STJOHN    F.N.    100   11    3700  19    100   15    3700  19

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  30   NE  33
SMITHERS              N   13   NE  33

TODAY'S VENTING:GOOD EXCEPT ONLY FAIR IN THE NORTHWEST

VENTING FOR FRIDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   16    1750  11    100   19    2150  11
FRASER VLY   QUIL     98   15    1550  11    100   19    2100  11
SRN VRISL    QUIL     96   16    1650  10    100   20    2150  11
CNTRL VRISL  QUIL     96   16    1650  10    100   20    2150  11
NRN VRISL    HRDY     74   12    1000  10    100   15    1800  10
TERRACE      ANT      43   11     900   6     58   14    1550   5
STEWART      ANT      30   12     550   4     50   14    1150   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  20   W   20   W   20
PORT HARDY   NW  19   NW  19   NW  13
SANDSPIT     NW  20   N   20   N   20

TODAY'S VENTING: GOOD EXCEPT ONLY FAIR IN THE NORTHEAST

VENTING FOR FRIDAY: GOOD

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


END/MWSO
$$$$^^