FPCN39 CWLW 181400
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 18 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      38   12     800   5     60   15    1350   6

KAMLOOPS     KEL      46   12    1100   6     71   15    1750   6

OKANAGAN     KEL      38   11     900   6     71   15    1700   6

CASTLEGAR    SPOK      9   10     500  13    100   14    1600  22

CRANBROOK    SPOK     10    9     950  28    100   13    2250  25

REVELSTOKE   KEL      32   10     900   5     68   14    1700   6


*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    9   W   19   SW  30
CRANBROOK             SW  13   SW  31

TODAY'S VENTING: POOR TO FAIR BECOMING GOOD BY LATE MORNING.




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.     94    8    2150  13    100   13    3950  11

PR. GEORGE   P.G.     67    9    1650   8    100   13    2850  10

SMITHERS     P.G.     18    7     800   3     94   13    2400   8

WELLS GRAY   P.G.     ##   ##     ###  ##    100   13    4000  11

FT NLSN      F.N.      9    6     600   0     92   12    2400   7

FT STJOHN    F.N.     67    7    1600   9    100   13    3700   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            N   11   N   13
SMITHERS              W    9   W   13

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     84   12    1150  11     97   14    1450  12

FRASER VLY   QUIL     76   11     950  11     91   13    1300  12

SRN VRISL    QUIL     60   11     850   8     89   14    1350  10

CNTRL VRISL  QUIL     61   11     850   8     97   15    1550  11

NRN VRISL    HRDY     89   11    1050  13    100   14    1550  12

TERRACE      ANT      56   10    1150   6     96   17    3200   5

STEWART      ANT      58   11    1000   6     87   17    2500   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   22   W   30   W   30
PORT HARDY   NW  20   W   22   W   17
SANDSPIT     SW  15   SW  19   SW  24

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/TCS
$$$$^^