FPCN39 CWLW 071326
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 WEDNESDAY 7 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      20   14     550   3     35   21    1250   2
KAMLOOPS     KEL      16   13     600   8     44   20    1450   8
OKANAGAN     KEL      14   12     500   3     34   18     950   2
CASTLEGAR    SPOK      9   12     750   0     28   19    1000   4
CRANBROOK    SPOK      9    9     950  12     35   17    1150  12
REVELSTOKE   KEL      11   10     500   3     22   14     700   2

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   17   SW  33
CRANBROOK             SW  15   SW  43

TODAY'S VENTING: FAIR.


VENTING FOR THURSDAY: FAIR




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.     75    9    1450  19     86   16    2550  21
PR. GEORGE   P.G.     48   10    1150  10     86   14    1850  15
SMITHERS     P.G.      9    4     500   2     64   10     550   7
WELLS GRAY   P.G.     95   11    1850  18     72   15    2450  21
FT NLSN      F.N.     71    2    1000  14     58    4    1150  14
FT STJOHN    F.N.     84    4    1500  15     93    8    1700  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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              S   13   S

TODAY'S VENTING: GOOD


VENTING FOR THURSDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     21   13     200  13     29   16     250  13
FRASER VLY   QUIL     12   13     200   3     16   18     300   3
SRN VRISL    QUIL     12   12     150   3     14   16     250   3
CNTRL VRISL  QUIL     13   13     150   3     15   17     250   3
NRN VRISL    HRDY     21   11     150  10     57   14     800  10
TERRACE      ANT      10    7     250  27     56   10     750  26
STEWART      ANT       9    9       0  11     22   10     300  11

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   22   S   28   SW  35
PORT HARDY   NW   9   W   13   SW  24
SANDSPIT     SW  20   SW  30   SW  41

TODAY'S VENTING: POOR SOUTH. FAIR TO GOOD NORTH.


VENTING FOR THURSDAY: FAIR




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


END/MWSO