FPCN39 CWLW 291344
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 MONDAY 29 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   SPOK     10    6     200  13    100   10    1200  23
KAMLOOPS     SPOK     89    6     950  23    100   10    1550  28
OKANAGAN     SPOK     51    5     750  13    100    8    1150  23
CASTLEGAR    SPOK      9    3     500  13     91    6    1100  23
CRANBROOK    SPOK     58    2    1150  30    100    5    1850  34
REVELSTOKE   SPOK      9    3     450  13     80    5     900  23


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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   SW  31   SW  72
CRANBROOK             SW  26   SW  69

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: 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.    100    3    2750  29    100    7    3950  30
PR. GEORGE   P.G.    100    3    2200  23    100    7    3700  28
SMITHERS     P.G.     14    0     600   6    100    6    2500  19
WELLS GRAY   P.G.    100    3    2750  29    100    7    4000  30
FT NLSN      F.N.     35   -6     650  12     69   -3    1050  13
FT STJOHN    F.N.     66   -3    1250  14     93    1    2000  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  20   S   30
SMITHERS              E   22   SE  30

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    7     650  37    100    8    1200  38
FRASER VLY   QUIL     90    7     450  34    100    8    1100  38
SRN VRISL    QUIL     25    7     100  20    100    9    1400  36
CNTRL VRISL  QUIL     18    6      50  20    100    9    1450  36
NRN VRISL    HRDY     56    5     350  17    100    7     950  20
TERRACE      ANT       9    3     200   9     89    6    1200  14
STEWART      ANT       9    2      10   9     52    6     450  12

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  44   SW  65   SW  67
PORT HARDY   SW  22   SW  26   SW  26
SANDSPIT     N   17   N   17   N   17

TODAY'S VENTING: GOOD LOCALLY FAIR NORTH COAST

VENTING FOR TUESDAY: FAIR

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


END/MWSO