FPCN39 CWLW 051341
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 5 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      15    3     750   1     29    5    1600   2
KAMLOOPS     KEL      14    2    1000   1     36    5    1950   2
OKANAGAN     KEL      12    1     650   1     29    4    1800   2
CASTLEGAR    SPOK     16    2     850   2     31    4    1350   3
CRANBROOK    SPOK      9   -3     950   4      9   -1     950   4
REVELSTOKE   KEL      18    2    1400   1     34    4    1950   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   VR   5   W    9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: POOR.

VENTING FOR FRIDAY: FAIR NORTH. POOR SOUTH.




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.     45   -2    1350  13     58    1    1550  11
PR. GEORGE   P.G.     35   -2    1250  10     75    0    1500  15
SMITHERS     P.G.     34    0    1450   5     50    1    1500   8
WELLS GRAY   P.G.     32   -5    1370  11     48    0    1550  11
FT NLSN      F.N.      9  -10     400   4     33   -7    1150   4
FT STJOHN    F.N.     27   -9    1200   4     40   -7    1250   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  20   NE  15
SMITHERS              E   19   NE  15

TODAY'S VENTING: FAIR.


VENTING FOR FRIDAY: FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     21    6     600   3     61   10    1750   4
FRASER VLY   QUIL     14    4     250   3     55    9    1500   4
SRN VRISL    QUIL     20    6     400   3     58   10    1650   4
CNTRL VRISL  QUIL     15    4     200   3     58   10    1650   4
NRN VRISL    HRDY      9    4       0   2     56    9    1550   4
TERRACE      ANT       9    3     250   7     85    7    1750   8
STEWART      ANT      11    3      50   3     54    7     850   7

*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    VR   5   NW   9   NW  15
PORT HARDY   VR   5   NW  13   N   24
SANDSPIT     NE  13   N   17   N   15

TODAY'S VENTING: FAIR.

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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