FPCN39 CWLW 251400
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 PDT TUESDAY 25 MAY 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      49   19     500  12    100   22     600  20
KAMLOOPS     KEL      24   21     700   8    100   23    1900  18
OKANAGAN     KEL      14   17     500   7    100   24    3350  15
CASTLEGAR    SPOK     30   17     750   9     81   25    1150  15
CRANBROOK    SPOK      9   17     950   7     80   23     950  15
REVELSTOKE   KEL      10   14     450   3     70   20     700  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   22   W   28
CRANBROOK             SW  13   SW  28

TODAY'S VENTING: BECOMING GOOD OVER ALL AREAS BY AFTERNOON.

VENTING FOR WEDNESDAY: 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   12    2650  18    100   14    3950  22
PR. GEORGE   P.G.     60   10    1800  10    100   14    2550  15
SMITHERS     P.G.      9    7     500   5    100   13    2050  18
WELLS GRAY   P.G.     75    6    1500  12    100   14    4000  29
FT NLSN      F.N.     77   15    1150  10    100   18    2100  15
FT STJOHN    F.N.    100   14    1800  15    100   17    2800  22

*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            W   31   W   37
SMITHERS              SW  37   SW  37

TODAY'S VENTING: GOOD BY AFTERNOON OVER ALL AREAS.

VENTING FOR WEDNESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   14    1600  20    100   17    1900  20
FRASER VLY   QUIL    100   15    1650  10    100   19    2050  16
SRN VRISL    QUIL    100   14    1500  12    100   19    2050  14
CNTRL VRISL  QUIL    100   15    1650  10    100   21    2250  15
NRN VRISL    HRDY     71    9    1000   9    100   13    2300  10
TERRACE      ANT     100    8    1650  12    100   14    2400  15
STEWART      ANT     100    5    1500  10    100   13    2200  15

*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    W   20   W   24   W   30
PORT HARDY   W   17   W   19   W   28
SANDSPIT     SW  31   SW  37   SW  39

TODAY'S VENTING: GOOD OVER ALL AREAS.

VENTING FOR WEDNESDAY: GOOD

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


END/
$$$$^^