FPCN39 CWLW 141400
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 14 MAY 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      21   10     550   3    100   15    2100  18
KAMLOOPS     KEL      36   11    1250   3     87   17    3350   6
OKANAGAN     KEL      35   11    1250   3     87   15    2650   4
CASTLEGAR    SPOK     52   11    1400   6     98   15    3500   6
CRANBROOK    SPOK     77    8    2700   6    100   13    3950   6
REVELSTOKE   KEL      33   10    1250   3    100   16    3450   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 FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    NW  11   N   20   N   31
CRANBROOK             VR   5   N   22

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.     71    8    2500   6    100   14    3950   7
PR. GEORGE   P.G.     40    7    1550   4     78   11    2700   5
SMITHERS     P.G.     27    7    1000   4     88   10    1950   4
WELLS GRAY   P.G.     71    8    2500   6    100   15    4000   7
FT NLSN      F.N.     71    7    1150  11     93   10    1850  10
FT STJOHN    F.N.     68    5    1400  12    100    8    3700  10

*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    9   VR   5
SMITHERS              VR   5   VR   5

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     35    9    1000   3     77   14    2550   3
FRASER VLY   QUIL     40    8     700   5    100   14    2000   7
SRN VRISL    QUIL     38    9     850   4     76   15    2700   3
CNTRL VRISL  QUIL     47   11    1400   3     78   16    3050   3
NRN VRISL    HRDY     20    7     200   7     88   12    1700   8
TERRACE      ANT      12    8     350   2     80   11    1200   2
STEWART      ANT       9    7       0   1     85   11     600   1

*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    W   19   NW  15   N    9
PORT HARDY   NW  19   NW  13   W    9
SANDSPIT     NW  17   N   13   N   17

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/
$$$$^^