FPCN39 CWLW 261403
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 FRIDAY 26 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       9    7     500   0     68   10    1000  10
KAMLOOPS     KEL      52    8     900   9    100   12    3350  16
OKANAGAN     KEL      37    7     700   9    100   10    2400  14
CASTLEGAR    SPOK     96    7    1150  25    100   10    2300  26
CRANBROOK    SPOK    100    6    2500  26    100    9    3950  28
REVELSTOKE   KEL       9    4     450   0     45    7     900   9

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   W   24   W   46
CRANBROOK             W   17   W   43

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: 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    4    3950  22    100    7    3950  22
PR. GEORGE   P.G.    100    4    2250  18    100    8    3700  21
SMITHERS     P.G.      9    2     500   1    100    7    3500  16
WELLS GRAY   P.G.    100    4    4000  22    100    7    4000  22
FT NLSN      F.N.      9    3     400   0     53    9    1550   5
FT STJOHN    F.N.      9    2     700   7     70    7    2000   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  39   W   50
SMITHERS              W   30   W   50

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    8    1400  21    100   10    1800  21
FRASER VLY   QUIL     91    7     900  17    100   10    1750  20
SRN VRISL    QUIL     83    7     700  17    100   10    1700  19
CNTRL VRISL  QUIL     83    7     750  17    100   11    1900  20
NRN VRISL    HRDY     13    3     200   2     70    6     900  10
TERRACE      ANT      87    3     900  20    100    6    1850  19
STEWART      ANT      87    3     700  20    100    6    1100  18

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   43   W   50   W   50
PORT HARDY   W   37   W   48   W   50
SANDSPIT     W   46   W   52   W   52

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.


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


END/DSL