FPCN39 CWLW 301400
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 30 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      58   21    1050   7    100   29    3200   8
KAMLOOPS     KEL      81   22    1900   7    100   29    3350   8
OKANAGAN     KEL      70   21    1600   7    100   29    3350   8
CASTLEGAR    SPOK     31   20     800   9    100   28    3500  12
CRANBROOK    SPOK      9   16     950   7    100   23    3950  14
REVELSTOKE   KEL      11   17     550   2     83   23    2100   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
PENTICTON    VR   5   N   15   N   17
CRANBROOK             VR   5   W   11

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: 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.     95   15    2500  10    100   20    3950  11
PR. GEORGE   P.G.     59   13    1300  10    100   21    3700  11
SMITHERS     P.G.     40   13    1050   7    100   21    3500   9
WELLS GRAY   P.G.     38   14     980   7    100   22    4000  11
FT NLSN      F.N.    100   14    1800  21    100   18    2600  26
FT STJOHN    F.N.    100   12    1950  27    100   16    2800  29

*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            N   20   N   26
SMITHERS              N   13   NE  26

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     51   17     950   6     63   20    1350   6
FRASER VLY   QUIL     57   18    1100   6     66   23    1400   6
SRN VRISL    QUIL     49   17     850   6     61   21    1350   5
CNTRL VRISL  QUIL     52   18    1050   5     64   24    1450   5
NRN VRISL    HRDY     40   14     550   7     68   18     950   9
TERRACE      ANT      10   15     250  12    100   24    2250   8
STEWART      ANT      50   16     550   9     94   24    1650   9

*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    VR   5   NE  11   N   13
PORT HARDY   N   11   NE  13   N   20
SANDSPIT     N   35   N   33   N   37

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/JEM
$$$$^^