FPCN39 CWLW 011400
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 1 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      27   22     650   4     65   27    1550   3
KAMLOOPS     KEL      24   21     750   4     76   28    2300   5
OKANAGAN     KEL      24   21     750   4     91   29    2600   6
CASTLEGAR    SPOK     48   23    1150   7    100   29    3500   7
CRANBROOK    SPOK      9   16     950  11     80   24    2400   8
REVELSTOKE   KEL      12   19     600   2     56   26    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   SW  13   S   17
CRANBROOK             VR   5   S   19

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.     50   14    1250  15    100   21    3950   8
PR. GEORGE   P.G.     50   14    1050  13    100   21    2700   9
SMITHERS     P.G.     51   16    1100   9    100   25    3500   8
WELLS GRAY   P.G.     50   12    1400  10    100   22    4000   8
FT NLSN      F.N.     10   14     500   1     74   21    2250   5
FT STJOHN    F.N.      9   11     700   7     72   18    2250   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
PR. GEORGE            E   17   E   15
SMITHERS              E   26   E   15

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     92   18    1050  15    100   23    1550  17
FRASER VLY   QUIL     96   19    1100  15    100   26    1750  17
SRN VRISL    QUIL     30   16     800   3    100   23    1550  14
CNTRL VRISL  QUIL    100   22    1500  13    100   27    1850  14
NRN VRISL    HRDY     16   15     200   4     29   21     550   4
TERRACE      ANT      10   21     250   9    100   28    3200   8
STEWART      ANT      13   19     100   4     37   28     800   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
VANCOUVER    S    9   S   19   S   28
PORT HARDY   VR   5   SE  22   SE  24
SANDSPIT     E   22   E   24   E   22

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
$$$$^^