FPCN39 CWLW 241400
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 24 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       9   15     200   2     70   18     700  15
KAMLOOPS     KEL      28   16     650   7     49   18     950   8
OKANAGAN     KEL      13   15     550   2    100   17    2500   8
CASTLEGAR    SPOK      9   14     500   5    100   17    2500   8
CRANBROOK    SPOK      9   12     950  19     49   17    1200  19
REVELSTOKE   KEL       9   13     450   2     36   16     800   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   SW  22   W   35
CRANBROOK             S   17   S   48

TODAY'S VENTING: POOR TO FAIR EXCEPT GOOD THIS AFTERNOON
SOUTHWESTERN SECTIONS.

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.     54   13    1350  13    100   17    3950  10
PR. GEORGE   P.G.     29   13     950   8    100   19    3700   9
SMITHERS     P.G.     17   11     750   4     81   18    1850   8
WELLS GRAY   P.G.     ##   ##     ###  ##    100   18    4000  10
FT NLSN      F.N.      9   13     400   2     80   18    3400   4
FT STJOHN    F.N.     45   12    1700   4     82   16    3700   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
PR. GEORGE            NE  20   E   19
SMITHERS              NE   9   NE  19

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

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     70   14     750   7    100   16    1450  10
FRASER VLY   QUIL     40   14     550   4    100   16    1450  10
SRN VRISL    QUIL     39   15     800   4    100   17    1500  10
CNTRL VRISL  QUIL     39   15     850   4     75   18    1550   6
NRN VRISL    HRDY     27   13     350   6     75   15    1550   6
TERRACE      ANT      10   12     250  10     77   16    1450   8
STEWART      ANT      16   11     150   5     58   16     950   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
VANCOUVER    W   28   W   30   SW  20
PORT HARDY   NW  26   NW  22   N   13
SANDSPIT     NW  28   N   17   VR   5

TODAY'S VENTING: BECOMING GOOD BY THIS AFTERNOON.

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
$$$$^^