FPCN39 CWLW 241400
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 SATURDAY 24 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      80   20    2000  13     17   22    3550  18
KAMLOOPS     KEL      33   20     550   4     87   24    3350   8
OKANAGAN     KEL      12   19     500   2     87   25    3350   8
CASTLEGAR    SPOK     31   14     750   9     78   25    2850   9
CRANBROOK    SPOK      9   18     950  12     88   24    1950  13
REVELSTOKE   KEL      10   16     500   2     73   20    1650   8

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W   11   W   20   W   26
CRANBROOK             W   15   W   33

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: 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.    100   13    3950   7    100   19    3950   7
PR. GEORGE   P.G.     30   11     950  10    100   19    3700   8
SMITHERS     P.G.     29   12     850   7    100   19    3500   8
WELLS GRAY   P.G.     28   12     900   4    100   19    4000   7
FT NLSN      F.N.     56   14    1700   4    100   19    3400   6
FT STJOHN    F.N.     67   12    2100   6    100   17    3700   7

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   22   W   26
SMITHERS              W   19   NW  26

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     50   18    1050   5     69   21    1550   6
FRASER VLY   QUIL     54   19    1150   5     78   23    1950   6
SRN VRISL    QUIL     42   17     850   4     65   21    1450   5
CNTRL VRISL  QUIL     42   17     900   4     66   21    1450   5
NRN VRISL    HRDY     62   14     600  12     97   16    1250  13
TERRACE      ANT      48   14     950   6     84   19    1900   7
STEWART      ANT      28   14     500   4     77   19    1800   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  20   W   22   W   30
PORT HARDY   NW  20   NW  24   NW  35
SANDSPIT     NW  19   NW  30   NW  41

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD

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

END/WJW
$$$$^^