FPCN39 CWLW 231330
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 TUESDAY 23 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      77   11     550  15     94   15    2250  20
KAMLOOPS     KEL      14   10     600   2     60   15    2200   8
OKANAGAN     KEL      12    8     500   2     60   14    2200   8
CASTLEGAR    SPOK     26    8     800   6     60   15    2250   7
CRANBROOK    SPOK      9    7     950  13     70   14    2800   8
REVELSTOKE   KEL       9    5     450   2     56   10    2200   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   S   39
CRANBROOK             VR   5   SE  22

TODAY'S VENTING: GOOD.


VENTING FOR WEDNESDAY: 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.     70    8    1350  12     70   11    2550  12
PR. GEORGE   P.G.      9    6     700   8     70   11    2850   8
SMITHERS     P.G.     11    5     650   2     72    9    2750   1
WELLS GRAY   P.G.     70    8    1350  12     80   11    2900  11
FT NLSN      F.N.      9    4     400   0     25   11    1100   6
FT STJOHN    F.N.      9    5     700  16     29    9    1100   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   22   S   37
SMITHERS              SE  22   S   37

TODAY'S VENTING: POOR TO GOOD.

VENTING FOR WEDNESDAY: FAIR.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   10    1750  24    100   13    2300  15
FRASER VLY   QUIL    100   10    1700  24    100   14    2500  15
SRN VRISL    QUIL    100    9    1150  20    100   13    2200  13
CNTRL VRISL  QUIL    100    9    1150  20    100   12    2050  12
NRN VRISL    HRDY     51    8     800   6    100   11    1850  16
TERRACE      ANT      10    5     200  22    100    8    1600  11
STEWART      ANT      10    5     200  22    100    8     900  11

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  24   S   33   S   52
PORT HARDY   SE  52   SE  76   SE  87
SANDSPIT     SE  69   SE  70   SE  61

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD.




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


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