FPCN39 CWLW 281400
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 28 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      17   23     550   2    100   32    1450  20
KAMLOOPS     KEL      22   24     800   3     36   30    1450   3
OKANAGAN     KEL      17   22     600   3     40   31    1500   4
CASTLEGAR    SPOK     17   23     750   3     78   31    3500   4
CRANBROOK    SPOK      9   22     950   4     84   31    3950   4
REVELSTOKE   KEL      11   19     550   2     29   27    1200   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   SW  15
CRANBROOK             VR   5   S   17

TODAY'S VENTING: GOOD TO FAIR LOCALLY POOR

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.     34   21    1050  20     60   24    1250  20
PR. GEORGE   P.G.     16   16     800   8     44   21    1000  13
SMITHERS     P.G.      9   12     500   1     44   18    1000  10
WELLS GRAY   P.G.     34   21    1050  20     60   24    1400  20
FT NLSN      F.N.     26   14     700   6     58   19    1050   9
FT STJOHN    F.N.     35   15     950  12     79   20    1450  14

*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            S   46   SW  59
SMITHERS              SW  43   SW  59

TODAY'S VENTING: FAIR TO 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     57   21     850   8     75   25    1250   8
FRASER VLY   QUIL     60   22     900   8     87   27    1500   9
SRN VRISL    QUIL      9   17     600   0     39   22     850   4
CNTRL VRISL  QUIL     38   21     850   4     69   26    1350   6
NRN VRISL    HRDY      9   17       0   7     35   19     350   7
TERRACE      ANT      50   11     400  20     75   13     600  20
STEWART      ANT       9   11       0  20     79   13     600  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW   9   SW  24   S   43
PORT HARDY   SW  17   SW  33   S   54
SANDSPIT     SW  44   SW  56   SW  61

TODAY'S VENTING: GOOD LOCALLY POOR

VENTING FOR SUNDAY: GOOD

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

END/MWSO
$$$$^^