FPCN39 CWLW 261342
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 PST THURSDAY 26 MARCH 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      75   10     500   2    100   14    3200  17
KAMLOOPS     KEL      92    9     500   2    100   14    3350  17
OKANAGAN     KEL      58    9     500   2    100   14    3350  17
CASTLEGAR    SPOK     72    8    1150  14    100   11    2250  22
CRANBROOK    SPOK    100    7    2350  24    100   11    3950  25
REVELSTOKE   KEL      59    6     450   2    100    9    1700  10

*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    W    9   W   22   W   43
CRANBROOK             W   17   W   41

TODAY'S VENTING: GOOD

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.    100    3    2750  27    100    8    3950  30
PR. GEORGE   P.G.    100    3    1650  27    100    8    3700  30
SMITHERS     P.G.     15    2     650   5    100    7    2700  12
WELLS GRAY   P.G.    100    5    4000  30    100    9    4000  30
FT NLSN      F.N.    100    5    1750  40    100    8    2400  36
FT STJOHN    F.N.    100    3    2050  37    100    7    3700  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  31   SW  43
SMITHERS              W   28   W   43

TODAY'S VENTING: GOOD

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    100   10    1800  19    100   12    2050  19
FRASER VLY   QUIL    100    9    1450  17    100   13    2250  19
SRN VRISL    QUIL    100   10    1750  15    100   13    2150  17
CNTRL VRISL  QUIL     20    8     300   5    100   12    1900  16
NRN VRISL    HRDY     24    6     300   6    100    9    2200  13
TERRACE      ANT     100    4    1300  26    100    7    2600  26
STEWART      ANT     100    5     950  21    100    7    1650  23

*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    SW  31   SW  43   SW  52
PORT HARDY   W   33   W   39   W   44
SANDSPIT     W   33   W   33   W   33

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

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


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