FPCN39 CWLW 281330
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 SUNDAY 28 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      20    5     650   3    100    9    3200   9
KAMLOOPS     KEL      18    4     700   3    100    9    3350   9
OKANAGAN     KEL      14    3     600   2    100    8    3350   9
CASTLEGAR    SPOK     38    3     950   7    100    8    3500  16
CRANBROOK    SPOK     37    0    1250  11    100    6    3950  19
REVELSTOKE   KEL      12    2     600   2     77    5    2050   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   11   S   26   SW  48
CRANBROOK             SW  17   SW  41

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: 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.     54    0    1400  12    100    5    3950  19
PR. GEORGE   P.G.     22    0     850   8    100    5    3700  18
SMITHERS     P.G.     24    1     750   7    100    5    2100  15
WELLS GRAY   P.G.     54    0    1400  12    100    5    4000  19
FT NLSN      F.N.     13    0     600   2    100    5    1650  14
FT STJOHN    F.N.      9    0     700  20    100    5    3700  17

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   31   S   44
SMITHERS              S   22   S   44

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     94    6    1050  16    100    9    2150  17
FRASER VLY   QUIL     74    5     750  14    100    9    2100  16
SRN VRISL    QUIL     60    5     650  11    100    9    1950  15
CNTRL VRISL  QUIL     74    6     800  12    100    9    2000  15
NRN VRISL    HRDY     54    4     550  11    100    7    1650  17
TERRACE      ANT      10    0     220  12    100    4    1400  16
STEWART      ANT       9    0     10   12     48    4     300  16

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   41   S   57   SW  57
PORT HARDY   SE  72   SE 102   S  124
SANDSPIT     SE  26   SE  31   S   37

TODAY'S VENTING: GOOD LOCALLY FAIR NORTH COAST

VENTING FOR MONDAY: GOOD

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


END/RET