FPCN39 CWLW 041356
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 4 MARCH 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      80    5    1000  17    100    6    2750  20
KAMLOOPS     KEL      60    5     900  10     80    7    2200   2
OKANAGAN     KEL      73    3     500   2     81    7    2200   2
CASTLEGAR    SPOK     70    2    1000  17    100    5    2750  18
CRANBROOK    SPOK    100    1    1950  19    100    4    3950  15
REVELSTOKE   KEL      10    1     500   2     61    3    3550   2

*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   W   31
CRANBROOK             W   11   W   24

TODAY'S VENTING:  GOOD


VENTING FOR FRIDAY: FAIR TO 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.     73    1    2000   9     88    3    2450   9
PR. GEORGE   P.G.     65   -1    1500  10     76    2    1750  10
SMITHERS     P.G.     56   -1    1350   7     69    2    1600   8
WELLS GRAY   P.G.     20   -1    1800   2     90    3    2600   9
FT NLSN      F.N.     36  -12     750   9     50  -10     950   9
FT STJOHN    F.N.     58   -9    1400   9     58   -9    1400   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   11   W   19
SMITHERS              SW  13   SW  19

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR FRIDAY: FAIR TO GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    1     100  10     79    7    3300  10
FRASER VLY   QUIL      9    2      50  10     79    7    3350  10
SRN VRISL    QUIL      9    2       0   8     79    7    3330   8
CNTRL VRISL  QUIL      9    1      50   8     79    7    3350   8
NRN VRISL    HRDY      9    1       0   7     79    5    3330   7
TERRACE      ANT      15    0     300   5     75    3    3300   5
STEWART      ANT       9    0       0   3     79    3    3330   3

*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   24   W   31   W   31
PORT HARDY   W   26   NW  39   NW  43
SANDSPIT     W   20   W   28   W   33

TODAY'S VENTING: GOOD


VENTING FOR FRIDAY: FAIR




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


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