FPCN39 CWLW 141337
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 TUESDAY 14 JULY 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      18   15     500   3     91   22    1950   8
KAMLOOPS     KEL      14   14     500   3     96   23    2350   8
OKANAGAN     KEL      13   13     500   3     96   23    2350   8
CASTLEGAR    SPOK     21   16     750   5     92   24    1900  10
CRANBROOK    SPOK      9   13     950   9    100   22    3950  18
REVELSTOKE   KEL      11   14     500   3     63   22    2350   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   19   SW  39
CRANBROOK             SW  11   W   28

VENTING FOR WEDNESDAY: 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.     76   11    1650  14    100   21    3950  14
PR. GEORGE   P.G.     47   11    1150  10    100   20    3700  12
SMITHERS     P.G.     52   12    1050  10    100   18    2650  12
WELLS GRAY   P.G.    100   12    2550  13    100   22    4000  14
FT NLSN      F.N.     95   11    1000  26    100   18    2050  26
FT STJOHN    F.N.    100   12    1900  26    100   17    2350  25

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              E   20   SE

VENTING FOR WEDNESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     35   14     200  24    100   18     950  25
FRASER VLY   QUIL     60   15     350  24    100   19    1100  25
SRN VRISL    QUIL      9   15     250   0    100   19    1000  19
CNTRL VRISL  QUIL      9   14      50   0     63   17     650  12
NRN VRISL    HRDY     30   12     300   9     78   16     600  17
TERRACE      ANT       9   11     250   4     79   18    2350   5
STEWART      ANT      19   13     350   3     77   18    2050   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   28   S   50   SW  61
PORT HARDY   SE  57   S   69   S   65
SANDSPIT     E   28   E   31   E   43

VENTING FOR WEDNESDAY: GOOD

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


END/RET