FPCN39 CWLW 031400
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 MONDAY 3 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   SPOK      9    3     200  12    100   13    1900  12
KAMLOOPS     SPOK      9    8     350  12    100   13    2100  11
OKANAGAN     SPOK      9    7     350  12    100   12    1800  12
CASTLEGAR    SPOK     68    8    1150  13     95   11    1950  11
CRANBROOK    SPOK     60    5    1500  12    100   10    3950   8
REVELSTOKE   SPOK      9    7     450  12     88   10    1550  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
PENTICTON    W    9   W   22   W   44
CRANBROOK             SW  15   SW  35

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    5    2650  11    100   11    3950  17
PR. GEORGE   P.G.     74    4    2000   7    100    8    2700  10
SMITHERS     P.G.     17    2     850   3     85    7    2250   7
WELLS GRAY   P.G.    100    5    2650  11    100   11    4000  17
FT NLSN      F.N.     18    5     500   8     89   11    1550  11
FT STJOHN    F.N.     44    5    1100  10    100   10    3700  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
PR. GEORGE            W   15   W   24
SMITHERS              W   17   SW  24

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   10    1300  16    100   12    1850  17
FRASER VLY   QUIL     89    9    1000  15    100   12    1800  17
SRN VRISL    QUIL     68    9     900   9    100   12    1700  14
CNTRL VRISL  QUIL     68    9     900   9    100   13    2000  15
NRN VRISL    HRDY     25    6     400   4    100    9    1800  11
TERRACE      ANT      66    4    1800   5    100    7    3200   8
STEWART      ANT      55    5    1450   4     78    7    2100   5

*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    W   26   W   31   W   33
PORT HARDY   W   22   W   26   W   26
SANDSPIT     W   24   W   26   W   24

TODAY'S VENTING: GOOD

VENTING FOR TUESDAY: GOOD

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


END/RET
$$$$^^