FPCN39 CWLW 091323
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 SUNDAY 9 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       9   20     450   0    100   32    3200   7
KAMLOOPS     KEL       9   19     500   0    100   33    3350   7
OKANAGAN     KEL       9   20     500   0    100   33    3350   7
CASTLEGAR    SPOK      9   15     500   2    100   34    3200   7
CRANBROOK    SPOK      9   15     500   3    100   32    3200   7
REVELSTOKE   KEL       9   20     500   0    100   30    3450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  17   SW  24
CRANBROOK             W    9   W   17

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: 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   14     950   8    100   26    3950  21
PR. GEORGE   P.G.     15   14     850   4     63   22    1700   7
SMITHERS     P.G.      9   13     550   2     28   17     950   5
WELLS GRAY   P.G.     32   16    1300   8    100   25    4000  21
FT NLSN      F.N.      9   15     400   0     67   22    1200   4
FT STJOHN    F.N.      9   14     700   0     67   21    2450   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  41   SW 39
SMITHERS              SW  33   SW 52

TODAY'S VENTING: GOOD


VENTING FOR MONDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     52   17     850   7     72   24    1350   7
FRASER VLY   QUIL     55   18     950   7     90   26    1550   9
SRN VRISL    QUIL      9   15     250   0     51   22    1200   4
CNTRL VRISL  QUIL      9   17     750   0     59   23    1250   5
NRN VRISL    HRDY      9   15       0   1     53   18     850   7
TERRACE      ANT       9   13     250   3     82   16    1100  13
STEWART      ANT      20   14     400   3     39   16     700   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  11   SW  26   SW  44
PORT HARDY   S   24   SW  33   SW  46
SANDSPIT     SW  31   SW  37   SW  43

TODAY'S VENTING: GOOD

VENTING FOR MONDAY: GOOD




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


END/LM