FPCN39 CWLW 021334
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 FRIDAY 2 OCTOBER 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     100   12    1500  20    100   17    3000  20
KAMLOOPS     KEL       9   14     900   0    100   19    3050  15
OKANAGAN     KEL       9   13     700   0    100   18    3000  15
CASTLEGAR    SPOK    100   14    1300  27    100   17    2100  27
CRANBROOK    SPOK    100   11    1650  31    100   17    3950  23
REVELSTOKE   KEL       9   11     550   0    100   14    3150  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   20   W   41
CRANBROOK             W   19   W   50

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: 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.     29    9    1250   7     79   13    2300   8
PR. GEORGE   P.G.     20   10    1000   4     37   12    1350   5
SMITHERS     P.G.      9    6     500   2    100   11    2850   5
WELLS GRAY   P.G.     57   11    1900   7     98   14    2700  10
FT NLSN      F.N.     73    0     800  24    100    2    1150  24
FT STJOHN    F.N.    100    3    1350  26    100    6    1650  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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              VR   5   VR

TODAY'S VENTING: GOOD EXCEPT FAIR IN PRINCE GEORGE AREA.

VENTING FOR SATURDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     58   12     500  15    100   15    1700  17
FRASER VLY   QUIL     36   12     450   8    100   17    2200  16
SRN VRISL    QUIL      9   10     100   1    100   16    1800  13
CNTRL VRISL  QUIL     24   12     350   5    100   15    1550  13
NRN VRISL    HRDY     17   10     100  11    100   13    1250  15
TERRACE      ANT      42   10     800   7     62   13    1600   5
STEWART      ANT      14   10     250   2     60   13    1250   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  19   W   26   W   37
PORT HARDY   S   26   SW  20   W   17
SANDSPIT     NE  17   N   11   NW   9

TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.




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


END/JDG