FPCN39 CWLW 111400
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 11 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      28   11     600   7     81   16    2000  15
KAMLOOPS     KEL      17   11     750   2    100   17    3350   9
OKANAGAN     KEL      12    8     500   2    100   17    3350   9
CASTLEGAR    SPOK     25    9     950   4     85   16    3500   4
CRANBROOK    SPOK      9    6     950   4     87   14    3950   4
REVELSTOKE   KEL      12    8     600   2    100   16    3450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S    9   S   20   S   37
CRANBROOK             VR   5   W   15

TODAY'S VENTING: POOR THIS MORNING INCREASING TO GOOD OVER ALL AREAS
THIS 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.      9    7     950   5    100   13    3950  15
PR. GEORGE   P.G.     22    8     900   4     80   13    3700  12
SMITHERS     P.G.     25    7     750   7     50   13    1000  10
WELLS GRAY   P.G.     15    4    1300   5    100   11    4000  20
FT NLSN      F.N.      9   -1     400   7     89   14    2500   7
FT STJOHN    F.N.     28    5    1200   8     80   14    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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   30   S   37
SMITHERS              SE  22   S   37

TODAY'S VENTING: POOR THIS MORNING INCREASING TO GOOD EXCEPT FAIR AT
SMITHERS.

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     15   10     100   8    100   13    1500  14
FRASER VLY   QUIL     15   10     200   7    100   13    1700  12
SRN VRISL    QUIL     24    9     200   8     83   13     800  15
CNTRL VRISL  QUIL     20    9     300  10     83   13     800  15
NRN VRISL    HRDY      9    9       0  12     22   10     100  14
TERRACE      ANT      30    8    1250   7    100   12    2000  12
STEWART      ANT      30    5    1050   8    100   12    1600  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    S   28   S   35   SW  39
PORT HARDY   W   28   W   30   SW  30
SANDSPIT     W   37   W   30   SW  19

TODAY'S VENTING: GENERALLY POOR THIS MORNING INCREASING TO GOOD THIS
AFTERNOON. EXCEPT REMAINING POOR OVER NORTHERN VANCOUVER ISLAND.

VENTING FOR WEDNESDAY: GOOD

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


END/
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