FPCN39 CWLW 081316
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 THURSDAY 8 APRIL 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      18    9     500   3     71   12    2600   6
KAMLOOPS     KEL      58   10    1500   6     93   13    2200   8
OKANAGAN     KEL      49    9    1250   5     82   12    2950   7
CASTLEGAR    SPOK     93    7    1200  11    100   10    2750  12
CRANBROOK    SPOK    100    6    1800  11    100   11    2650  19
REVELSTOKE   KEL       9    6     450   3     75    8    2250   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   SW  24
CRANBROOK             SW  11   SW  31

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.     62    5    1550  11    100    8    2600  15
PR. GEORGE   P.G.     38    4    1250   6     85    7    2450   8
SMITHERS     P.G.     10    2     600   8     82    7    2350   5
WELLS GRAY   P.G.     62    5    1550   8    100    8    2800  14
FT NLSN      F.N.     92   -2    1100   8    100    0    2650  14
FT STJOHN    F.N.    100    0    2000  14    100    1    2100  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  17   SW  22
SMITHERS              W   13   W   22

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    7    1850  13    100   10    3100  15
FRASER VLY   QUIL    100    7    1850  13    100   10    2800  14
SRN VRISL    QUIL    100    7    1750  11    100   10    2700  13
CNTRL VRISL  QUIL     76    6    1050  10    100   10    2700  13
NRN VRISL    HRDY     53    4     750   7     89    7    1800   8
TERRACE      ANT       9    2     250   8    100    6    2700   8
STEWART      ANT      10    1      50   4     85    6    1650   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   13   W   19   SW  28
PORT HARDY   W   11   W   15   W   17
SANDSPIT     NW  17   NW  19   W   20

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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