FPCN39 CWLW 301400
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 WEDNESDAY 30 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      36   17     700   6     96   21    3200   5
KAMLOOPS     KEL      41   16    1000   6     96   22    3350   5
OKANAGAN     KEL      41   16    1000   6     96   21    3350   5
CASTLEGAR    SPOK     33   16     800   8    100   22    3500  14
CRANBROOK    SPOK     10   15     950  10    100   20    3950  15
REVELSTOKE   KEL      16   14     600   5     63   17    2000   5

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   15   W   28   W   41
CRANBROOK             W   13   W   37

TODAY'S VENTING: GOOD.


VENTING FOR THURSDAY: 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     72   18    1600  05
PR. GEORGE   P.G.     44    8    1000  02     70   17    1500  05
SMITHERS     P.G.     38    9    1200  02     72   17    1500  05
WELLS GRAY   P.G.     47    8    1400  02     77   17    1700  07
FT NLSN      F.N.     51   11    1100   7     65   14    1450   7
FT STJOHN    F.N.     73   13    1800   8    100   17    2750   9

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   W   17
SMITHERS              SW  13   SW  17

TODAY'S VENTING: GOOD.


VENTING FOR THURSDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     34   15     750   4     63   18    1250   6
FRASER VLY   QUIL     34   15     700   4     66   19    1300   6
SRN VRISL    QUIL     22   15     600   2     54   18    1150   5
CNTRL VRISL  QUIL     27   15     600   3     60   19    1300   5
NRN VRISL    HRDY     14   12     150   5     36   14     450   7
TERRACE      ANT      56   12    1000   8     78   15    1750   7
STEWART      ANT      43   12     500   8     71   15    1200   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  20   W   31   W   46
PORT HARDY   SW  19   W   26   W   39
SANDSPIT     W   22   W   22   W   20

TODAY'S VENTING: GOOD


VENTING FOR THURSDAY: GOOD


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


END/MWSO
$$$$^^