FPCN39 CWLW 021400
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 FRIDAY 2 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   13     900   7     94   18    2300   7
KAMLOOPS     KEL      89   16    2250   7    100   20    3350  10
OKANAGAN     KEL      73   13    1700   7    100   19    2800   9
CASTLEGAR    SPOK     44   14    1400   7    100   18    2650  10
CRANBROOK    SPOK     44   12    2150   7    100   17    3950  10
REVELSTOKE   KEL      75   13    1850   7     98   17    2600   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   11   N   22
CRANBROOK             SW  13   W   35

TODAY'S VENTING: 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.     57   11    1950   7    100   16    2950  12
PR. GEORGE   P.G.     54   12    1500   7    100   17    2650  14
SMITHERS     P.G.     58   13    1200   9    100   19    2750  11
WELLS GRAY   P.G.     50   10    1400   8    100   16    4000  12
FT NLSN      F.N.      9   11     400   0     86   17    2600   6
FT STJOHN    F.N.      9   11     700   8     87   15    2650   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  22   NE  24
SMITHERS              NE  17   NE  24

TODAY'S VENTING: GOOD


VENTING FOR SATURDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     60   12    1300  10    100   17    2450  15
FRASER VLY   QUIL     60   13    1300  10    100   17    2400  15
SRN VRISL    QUIL     58   14    1500  10    100   18    2550  15
CNTRL VRISL  QUIL     58   13    1200  21    100   17    2350  15
NRN VRISL    HRDY     53   12     650   9     86   14    1150  11
TERRACE      ANT      27   10     500  13     39   14     650   8
STEWART      ANT      12   12     150   2     15   14     300   2

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

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  20   W   17   N    9
PORT HARDY   NW  13   N    9   NE  13
SANDSPIT     NW  26   N   24   N   22

TODAY'S VENTING: GOOD.


VENTING FOR SATURDAY: GOOD


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