FPCN39 CWLW 161315
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 16 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   16     200   5    100   24    3200  15
KAMLOOPS     KEL       9   16     350   5    100   25    3350  15
OKANAGAN     KEL       9   15     350   5    100   25    3350  15
CASTLEGAR    SPOK     61   16     950  15    100   26    3500  22
CRANBROOK    SPOK     80   15    1500  20    100   27    3950  26
REVELSTOKE   KEL       9   15     450   5    100   23    3450  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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   17   W   19
CRANBROOK             SW  11   W   28

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   11     950  10     88   16    2350  10
PR. GEORGE   P.G.     24   13     900   7     86   18    2200   8
SMITHERS     P.G.      9   13     550   3     87   19    2000   9
WELLS GRAY   P.G.     25   12    1150  10    100   17    4000   8
FT NLSN      F.N.     27   15     650   7    100   23    2400   9
FT STJOHN    F.N.     23   15     900   7     99   21    2600   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE
SMITHERS              NW  15   N

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     50   15     700   8    100   20    2150  12
FRASER VLY   QUIL     73   16    1050   9    100   21    2500  13
SRN VRISL    QUIL      9   14     150   0    100   21    2350  10
CNTRL VRISL  QUIL      9   13     100   0     92   19    1700   9
NRN VRISL    HRDY     14   13     150   4     61   16    1100   6
TERRACE      ANT       9   13     250   7     77   19    1750   7
STEWART      ANT      20   15     300   4     66   19    1300   6

*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   17   W   19   NW  20
PORT HARDY   NW  31   NW  31   N   28
SANDSPIT     NW  30   N   26   N   26

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/MWSO