FPCN39 CWLW 261400
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 26 AUGUST 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      31   22     850   3    100   28    2250  15
KAMLOOPS     KEL      20   20     700   3     92   28    3350   8
OKANAGAN     KEL      20   20     700   3     90   30    3350   8
CASTLEGAR    SPOK     32   21     800   8     86   30    3500   7
CRANBROOK    SPOK      9   20     950   7     87   27    3950   8
REVELSTOKE   KEL      17   19     700   3     83   26    2400   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  22   W   37
CRANBROOK             W   15   W   37

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   P.G.     48   14    3950   5     83   19    3950  12
PR. GEORGE   P.G.     37   12    1550   5     82   16    3700  10
SMITHERS     P.G.     11    9     700   1     78   15    1800  11
WELLS GRAY   P.G.     30    8    1200   7     90   19    4000  12
FT NLSN      F.N.     19   13     550   6     88   18    3400   8
FT STJOHN    F.N.    100   13    1700  40    100   18    3700  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  15   SW  31
SMITHERS              S   11   SW  31

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     53   19     850   7     62   22    1050   7
FRASER VLY   QUIL     52   18     800   7     90   25    1600   9
SRN VRISL    QUIL      9   16     500   0     51   21     950   6
CNTRL VRISL  QUIL     42   19     850   5     58   24    1150   6
NRN VRISL    HRDY     25   14     350   5     43   16     700   6
TERRACE      ANT       9   11     250   7    100   14    1950  12
STEWART      ANT      11   11      50   7     69   14    1050   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    VR   5   W   22   W   41
PORT HARDY   S   44   SW  59   SW  74
SANDSPIT     SE  20   VR   5   SW   9

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/
$$$$^^