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 THURSDAY 6 AUGUST 1998 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      47   24     950   6    100   30    3200   6
KAMLOOPS     KEL      32   22     800   5    100   30    3350   6
OKANAGAN     KEL      23   21     650   5    100   29    3350   6
CASTLEGAR    SPOK     57   24    1100  10    100   30    2000  18
CRANBROOK    SPOK     96   24    1600  24    100   29    3950  25
REVELSTOKE   KEL      70   23    1900   6     90   26    2650   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W    9   SW  17
CRANBROOK             W    9   W   19

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.


CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   ANT      88   14    2300  10    100   23    3950  13
PR. GEORGE   ANT      87   14    2200   9    100   20    3700  11
SMITHERS     ANT      89   13    2150   8     93   18    2300   8
WELLS GRAY   ANT     100   15    2500  11    100   24    4000  13
FT NLSN      F.N.      9   14     400   0      9   17    1300   0
FT STJOHN    F.N.      9   17    2200   0    100   23    3700  14

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   26   W   33
SMITHERS              W   22   W   33

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     92   19    1000  15    100   22    1350  16
FRASER VLY   QUIL     92   19    1000  15    100   25    3050  15
SRN VRISL    QUIL     70   17     850  10    100   23    1400  12
CNTRL VRISL  QUIL     80   19    1000  12    100   24    1550  13
NRN VRISL    HRDY     24   14     200   8    100   18    1500  12
TERRACE      ANT      97   16    2150   8     98   19    2200   8
STEWART      ANT      38   15     500   7     99   19    2200   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   W   13   W   20
PORT HARDY   W   15   W   17   W   30
SANDSPIT     S   44   SW  37   SW  35

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY: GOOD.


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


END/DSL