FPCN39 CWLW 011328
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 SATURDAY 1 AUGUST 1998 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   23     200   8    100   32    2200  12
KAMLOOPS     KEL      46   23     700  12    100   33    3350  13
OKANAGAN     KEL       9   22     350   8    100   32    2600  13
CASTLEGAR    SPOK     78   24    1350  12    100   30    3500   9
CRANBROOK    SPOK     75   21    2000   9    100   26    3950   7
REVELSTOKE   KEL      35   22     700  12    100   28    2000  12

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW   9   NW  19   NW  19
CRANBROOK             NW   9   NW  22

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.      9   15     950  22    100   29    3950  10
PR. GEORGE   P.G.     21   17     850   9    100   29    3700  11
SMITHERS     P.G.      9   15     500   2    100   27    2450  11
WELLS GRAY   P.G.     53   17    1250  22    100   31    4000  10
FT NLSN      F.N.     30   18     500  18     91   24    1150  19
FT STJOHN    F.N.      9   19     700  18    100   25    2700  15

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE   WSW 24   W   22   SSW 18
SMITHERS     WSW 18   W   20   W   24

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     48   19     900   6     81   24    1450   8
FRASER VLY   QUIL     48   18     900   6     80   24    1350   8
SRN VRISL    QUIL     43   17     850   5     52   22     900   6
CNTRL VRISL  QUIL     42   17     850   5     93   27    1800   8
NRN VRISL    HRDY     48   14     350  15    100   19    1250  17
TERRACE      ANT       9   14     250   7     93   24    3200   5
STEWART      ANT      46   16     750   6     93   24    3000   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   13   NW  13   W   13
PORT HARDY   NW  26   NW   9   W   13
SANDSPIT     NW  15   NW   9   SW  13

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

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


END/MWSO