FPCN39 CWLW 061341
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 FRIDAY 6 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       9    3     550   0     55    5    1400   5
KAMLOOPS     KEL      30    2     950   4     61    4    1650   5
OKANAGAN     KEL       9    1     500   0     61    4    1600   5
CASTLEGAR    SPOK     30    2     950   5     68    4    1650   7
CRANBROOK    SPOK     10   -3     950   8     55    0    1850   8
REVELSTOKE   KEL      32    2     950   5     63    3    1900   6

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW   9   W   19
CRANBROOK             VR   5   NW  15

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: FAIR

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.     32   -3    1350   6     89    0    2450   9
PR. GEORGE   P.G.     25   -7     950   6     57   -3    1350   9
SMITHERS     P.G.     26   -6     850   6     68   -1    1400   9
WELLS GRAY   P.G.     29   -2    1350   6     89    0    2500   9
FT NLSN      F.N.     36  -11     650  11     41  -10     750  10
FT STJOHN    F.N.     25  -10     850  11     40   -9    1050  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   W   19
SMITHERS              VR   5   NW  19

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR SATURDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     24    4     200  13    100   10    2600  11
FRASER VLY   QUIL     28    5     200  13    100   10    2550  11
SRN VRISL    QUIL     14    4     200   3    100   10    2400  10
CNTRL VRISL  QUIL     15    5     200   3    100   10    2450  10
NRN VRISL    HRDY     12    3     100   4     81    9    1850   6
TERRACE      ANT       9    0     200   1     25    4    1400   1
STEWART      ANT       9    0      50   1     22    4    1400   1

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   W   11   NW  15
PORT HARDY   S    9   SW  11   W   17
SANDSPIT     VR   5   VR   5   NW   9

TODAY'S VENTING: GOOD SOUTH TO POOR NORTH

VENTING FOR SATURDAY: FAIR TO POOR

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


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