FPCN39 CWLW 261400
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 WEDNESDAY 26 MAY 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      64   14     950  10    100   20    2900  15
KAMLOOPS     KEL      74   15    1600   8    100   22    3350   9
OKANAGAN     KEL      63   13    1100  10    100   21    3350   9
CASTLEGAR    SPOK     49   15    1100   8    100   22    3500   8
CRANBROOK    SPOK     39   14    1850   4    100   21    3950   9
REVELSTOKE   KEL      68   13    1300   9    100   20    3450   9

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  24
CRANBROOK             SW  11   SW  20

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.

VENTING FOR THURSDAY: 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.     60    7    3950   7    100   14    3950  15
PR. GEORGE   P.G.     70    7    1600   8    100   13    3700  12
SMITHERS     P.G.     12    5     600   3    100   10    3500  12
WELLS GRAY   P.G.     45    4    1500   9    100   15    4000  17
FT NLSN      F.N.    100   11    1750  10    100   17    3400  18
FT STJOHN    F.N.    100    9    2850  15    100   14    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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  26   SW  41
SMITHERS              S   30   SW  41

TODAY'S VENTING: RISING TO GOOD THIS AFTERNOON.

VENTING FOR THURSDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     15   13     100   6     70   18    1400  12
FRASER VLY   QUIL     15   12     100   6     70   19    1400  10
SRN VRISL    QUIL     51   12     950   5     99   19    3000   6
CNTRL VRISL  QUIL     50   12     950   5     99   19    3050   6
NRN VRISL    HRDY     22    8     450   3     73   13    1250   8
TERRACE      ANT      18    8    2000  12    100   14    2500  15
STEWART      ANT      32    3     400   8    100   11    2500  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   SW  17   SW  30
PORT HARDY   S   31   S   52   SW  63
SANDSPIT     S   80   S   72   SW  65

TODAY'S VENTING: GOOD OVER ALL AREAS THIS AFTERNOON.

VENTING FOR THURSDAY: GOOD

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


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