FPCN39 CWLW 041341
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 WEDNESDAY 4 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      12    3     500   1     50    5    1000  10
KAMLOOPS     KEL      60    4    1200  12     86    7    2200  12
OKANAGAN     KEL      11    2     550   1     48    4    1150   7
CASTLEGAR    SPOK     22    3    1000   5     42    5    1300   7
CRANBROOK    SPOK     18    0    1200   7     50    2    1800   8
REVELSTOKE   KEL      55    3    1150  10     70    4    1650  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NW   9   NW   9
CRANBROOK             VR   5   VR   5

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR THURSDAY: POOR



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.     37    0    1300  10     70    2    1850  12
PR. GEORGE   P.G.     33   -3    1100   7     85    0    1850  10
SMITHERS     P.G.      9   -1     700   6     23    0     850   8
WELLS GRAY   P.G.     58    0    1750  10     70    1    2000  13
FT NLSN      F.N.     10   -8     400  13     10   -8     400  13
FT STJOHN    F.N.     42   -8    1100  10     54   -7    1250  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  20   NE  13
SMITHERS              NE  15   NE  13

TODAY'S VENTING: POOR NORTH OTHERWISE FAIR TO GOOD.


VENTING FOR THURSDAY: POOR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     32    5     300  12     87    8    1150  12
FRASER VLY   QUIL     34    5     300  12     86    8    1100  12
SRN VRISL    QUIL     23    6     300   5     60    9    1350   5
CNTRL VRISL  QUIL     21    5     250   5     61    9    1400   5
NRN VRISL    HRDY      9    4       0   5    100    9    1300  15
TERRACE      ANT      43    0     700  10     75    7    1200  12
STEWART      ANT      38    0     700   6     58    7     900   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   11   W   11   NW  17
PORT HARDY   NW  11   N   15   N   13
SANDSPIT     N   19   N   24   N   33

TODAY'S VENTING: GOOD.

VENTING FOR THURSDAY: GOOD NORTH. FAIR SOUTH.




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


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