FPCN39 CWLW 221400
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 THURSDAY 22 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      52   24    1900   3     72   32    3200   3
KAMLOOPS     KEL      50   23    2000   3     72   30    3350   3
OKANAGAN     KEL      53   24    2150   3     72   31    3350   3
CASTLEGAR    SPOK     47   24    1150   7    100   30    3500  21
CRANBROOK    SPOK    100   22    3950  24    100   28    3950  24
REVELSTOKE   KEL      46   21    1850   3     54   24    2300   3

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  11   W   26   W   35
CRANBROOK             W   17   W   33

TODAY'S VENTING: GOOD LOCALLY FAIR

VENTING FOR FRIDAY: 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   20    3950  28    100   24    3950  28
PR. GEORGE   P.G.    100   18    1850  25    100   23    3700  25
SMITHERS     P.G.     16   16     650   6    100   21    2350  21
WELLS GRAY   P.G.    100   20    3950  28    100   24    4000  28
FT NLSN      F.N.     10   17     400   4     65   22    1100  11
FT STJOHN    F.N.     10   15     700  21    100   25    3700  20

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   35   SW  54
SMITHERS              SW  37   W   54

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

COAST
           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     45   20    1100   4     48   21    1200   4
FRASER VLY   QUIL     53   22    1300   5     57   23    1400   5
SRN VRISL    QUIL     44   20    1000   4     47   21    1150   4
CNTRL VRISL  QUIL     46   21    1150   4     58   24    1450   4
NRN VRISL    HRDY     40   18    1000   4     35   17     900   6
TERRACE      ANT     100   16    1550  15    100   18    1750  15
STEWART      ANT      79   15     900  12    100   18    1500  13

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

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   W   22   SW  35
PORT HARDY   SW  19   SW  33   SW  41
SANDSPIT     W   17   W   30   W   44

TODAY'S VENTING: GOOD TO FAIR

VENTING FOR FRIDAY: GOOD

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

END/MWSO
$$$$^^