FPCN39 CWLW 111400
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 11 JULY 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       9   20     200   8    100   31    2050  18
KAMLOOPS     KEL       9   16     350   4    69   31    2450   4
OKANAGAN     KEL       9   15     350   4     69   31    2450   4
CASTLEGAR    SPOK      9   16     500   4     37   31    1550   3
CRANBROOK    SPOK      9   17    1000   4    100   30    3950   9
REVELSTOKE   KEL       9   16     450   4     59   28    2000   4

*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   W   17   W   26
CRANBROOK             W   11   W   20

TODAY'S VENTING:  GOOD LOCALLY FAIR.

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   13    1000   4    100   24    3950  15
PR. GEORGE   P.G.      9   16     700   4     65   21    1750   7
SMITHERS     P.G.      9   15     550   4     57   21    1550   7
WELLS GRAY   P.G.      9   13    1050   4    100   24    4000  15
FT NLSN      F.N.      9   17     400   4     85   24    1650  10
FT STJOHN    F.N.      9   18     700   7    100   24    3700  10

*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            W   28   W   41
SMITHERS              SW  35   SW  41

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      9   16     100   4     67   23     950   9
FRASER VLY   QUIL      9   18      80   4     79   28    1300   9
SRN VRISL    QUIL      9   16      50   5     69   25    1050   8
CNTRL VRISL  QUIL      9   17      50   4     69   25    1050   8
NRN VRISL    HRDY      9   14      50   5     40   19     800   5
TERRACE      ANT       9   15     220  10    100   21    2250  24
STEWART      ANT       9   14      40  10    100   21    2000  21

*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    W   11   W   19   W   31
PORT HARDY   SW  13   SW  24   SW  41
SANDSPIT     SW  33   SW  46   SW  57

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR MONDAY: GOOD

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

END/mwso
$$$$^^