FPCN39 CWLW 171451
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 PST TUESDAY 17 FEBRUARY 1998 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       9    3     550   0     56    8    1050   7
KAMLOOPS     KEL      25    3     700   5     52    7    1150   7
OKANAGAN     KEL       9    1     500   0     47    6    1000   7
CASTLEGAR    SPOK     24    3     750   6     57    7    1200   9
CRANBROOK    SPOK     10    0     950  14     82    5    1800  13
REVELSTOKE   KEL       9    1     600   0     42    5    1000   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   17   S   26
CRANBROOK             VR   5   S   20

TODAY'S VENTING: FAIR

VENTING FOR WEDNESDAY: FAIR

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.      9    0     950  15     60    5    2450   7
PR. GEORGE   P.G.     26    0     850  10     32    4     950  10
SMITHERS     P.G.     15    0     800   2     27    5     900   5
WELLS GRAY   P.G.      9    0    1000  15     70    5    2500   7
FT NLSN      F.N.     44  -10     750  12     46   -9     750  12
FT STJOHN    F.N.     30   -6     850  13     43    0    1000  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SE  24   S   26
SMITHERS              SE  33   SE  26

TODAY'S VENTING: FAIR EXCEPT GOOD AT HIGHER ELEVATIONS

VENTING FOR WEDNESDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9    8     100  22     60   11    1250  10
FRASER VLY   QUIL     41    9     250  22     60   12    1550  10
SRN VRISL    QUIL     14    8     150   4     48   10     400  13
CNTRL VRISL  QUIL     10    6      50   4     16    9     200   4
NRN VRISL    HRDY     60    9     350  20     66   10     400  20
TERRACE      ANT       9    4     200  21     10    7     200  21
STEWART      ANT       9    7       0   7      9    7       0   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  33   S   41   S   43
PORT HARDY   SE  50   S   57   S   50
SANDSPIT     SE  59   SE  57   SE  57

TODAY'S VENTING: POOR NORTH FAIR TO GOOD SOUTH.

VENTING FOR WEDNESDAY: FAIR

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


END/MWSO