FPCN39 CWLW 061320
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 6 APRIL 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     41    7     800   6    100   13    2450   8
KAMLOOPS     SPOK     33    6     800   6    100   13    3350   7
OKANAGAN     SPOK     32    5     750   6    100   13    3350   7
CASTLEGAR    SPOK     28    6     850   6    100   13    3500   7
CRANBROOK    SPOK      9    3     950   9    100   11    3950   7
REVELSTOKE   SPOK     28    5     800   6    100   11    2750   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
PENTICTON    W   13   W   24   W   39
CRANBROOK             W   19   W   44

TODAY'S VENTING: GOOD

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.     88    3    2100  12    100    8    3950  26
PR. GEORGE   P.G.    100    5    1950  21    100    7    2400  23
SMITHERS     P.G.     25    4     750   8    100    7    2100  17
WELLS GRAY   P.G.     88    3    2100  12    100    8    4000  26
FT NLSN      F.N.      9    1     400   0     66    4     950  14
FT STJOHN    F.N.    100    4    2500  15    100    8    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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   46   W   63
SMITHERS              SW  48   W   63

TODAY'S VENTING: GOOD

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     14    7     350   2     75   12    1600   7
FRASER VLY   QUIL     15    6     250   3     74   12    1500   7
SRN VRISL    QUIL     19    7     300   4     68   12    1300   6
CNTRL VRISL  QUIL     21    9     450   3     80   13    1750   6
NRN VRISL    HRDY     31    7     300   9     81    9    1050  11
TERRACE      ANT      10    5     250  14    100    8    1250  18
STEWART      ANT       9    5       0   5     75    8     850  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   W   28   W   43
PORT HARDY   SW  35   W   43   W   61
SANDSPIT     W   39   W   54   W   70

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.


END/RET