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 SUNDAY 25 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      20   21    3200   8     95   26    3200  15
KAMLOOPS     KEL      15   19    3350   5    100   25    3350  10
OKANAGAN     KEL      15   19    3350   5    100   25    3350  10
CASTLEGAR    SPOK     30   18    2100   7    100   26    3500   9
CRANBROOK    SPOK     20   16    2200   6    100   22    3950  10
REVELSTOKE   KEL      12   15     550   6     75   20    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   19
CRANBROOK             W   15   W   35

TODAY'S VENTING: GOOD BY AFTERNOON.

VENTING FOR MONDAY: FAIR.

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   14    3950  17    100   20    3950  17
PR. GEORGE   P.G.     96   14    1700  16    100   20    3700  16
SMITHERS     P.G.     41   13    1000   8    100   19    3500  13
WELLS GRAY   P.G.     30  13     1200   7    100   20    4000  17
FT NLSN      F.N.     15   12     700   2    100   20    2850  14
FT STJOHN    F.N.     93   13    1850  13    100   20    3700  16

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   24   W   30
SMITHERS              SW  24   W   30

TODAY'S VENTING: GOOD VENTING BY AFTERNOON.

VENTING FOR MONDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     30   16    1400   5     85   21    1550   8
FRASER VLY   QUIL     25   15    1450   5     75   23    1600   8
SRN VRISL    QUIL     35   15    1250   9     80   21    1550   9
CNTRL VRISL  QUIL     32   17    1350   9     80   21    1550   9
NRN VRISL    HRDY     35   14    1150   7     67   17    1150   7
TERRACE      ANT      30   15    1200   7     77   19    2100   5
STEWART      ANT      28   14    1050   6     72   19    1600   6

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   NW  19   W   31
PORT HARDY   SW   9   W   19   NW  31
SANDSPIT     W   24   W   30   W   31

TODAY'S VENTING: GOOD BY AFTERNOON.

VENTING FOR MONDAY: FAIR.

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




END/MWSO
$$$$^^