FPCN39 CWLW 011400
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 1 JUNE 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     100   13    2200  20    100   16    3350  15
KAMLOOPS     KEL      11   14     550   1    100   17    3350  12
OKANAGAN     KEL      11   14     550   1    100   17    3350  12
CASTLEGAR    SPOK     48   13     900  11    100   17    1700  21
CRANBROOK    SPOK     93   12    1600  23    100   17    3950  16
REVELSTOKE   KEL       9   12     500   1     94   15    1800  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
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   SW  19

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.     93    8    2700   9    100   13    3950   8
PR. GEORGE   P.G.     75    7    1850   8    100   14    3700   8
SMITHERS     P.G.     75    9    2000   7    100   15    3500   7
WELLS GRAY   P.G.     93    6    2800   9    100   13    4000   8
FT NLSN      F.N.     76   13     950  18    100   17    2850  19
FT STJOHN    F.N.      9    7     700  22    100   12    1550  20

*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   22   NE  31
SMITHERS              N   20   NE  31

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    100   12    1900  18    100   14    2350  18
FRASER VLY   QUIL    100   11    1500  17    100   13    2150  18
SRN VRISL    QUIL    100   11    1400  16    100   14    2300  17
CNTRL VRISL  QUIL    100   10    1150  16    100   13    2050  17
NRN VRISL    HRDY     75    8     650  16    100   11    1450  19
TERRACE      ANT      84    9     800  20    100   15    1850  20
STEWART      ANT      83   10     800  15    100   15    1100  16

*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    VR   5   VR   5   NE  13
PORT HARDY   NW  33   N   30   N   30
SANDSPIT     NW  43   N   46   N   43

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/JDG
$$$$^^