FPCN39 CWLW 121337
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 TUESDAY 12 MAY 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      24   15     600   4     66   20    1250   7
KAMLOOPS     KEL      42   17    1000   6    100   24    3350  10
OKANAGAN     KEL      20   14     650   4     84   22    1800   8
CASTLEGAR    SPOK     30   14     900   6     72   21    1600   8
CRANBROOK    SPOK     29   14    1150  10    100   21    3950  12
REVELSTOKE   KEL      46   17    1150   6    100   25    3450  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   NE  11   NE  19
CRANBROOK             E   11   E   24

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2000 m         22 C
SPOKANE         1500 m         18 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO 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.      9   13     950   7    100   21    3950   9
PR. GEORGE   P.G.     37   16    1200   6    100   24    3700   9
SMITHERS     P.G.     10   12     650   1     82   17    2150   4
WELLS GRAY   P.G.     30   14    1300   7    100   21    4000   9
FT NLSN      F.N.     41   15     650  13     73   21    1100  12
FT STJOHN    F.N.      9   13     700  13     73   19    1400  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            VR   5   SE   9
SMITHERS              SW  11   S    9

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1500 m         22 C
FT. NELSON      1500 m         22 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     69   13    1050   9     79   16    1700   7
FRASER VLY   QUIL     67   14    1150   7     81   18    1900   6
SRN VRISL    QUIL     59   14    1100   6     70   17    1750   5
CNTRL VRISL  QUIL     54   13     950   6     76   18    1850   5
NRN VRISL    HRDY     41   10     450   9     85   13    1150  11
TERRACE      ANT      49   11    1650   3     69   15    2450   4
STEWART      ANT      47   11    1050   4     69   15    2150   4

*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    NW  11   NE   9   E   15
PORT HARDY   NW  22   VR   5   S   11
SANDSPIT     NW  28   W   17   SW  22

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2300 m         23 C
PORT HARDY      2500 m         24 C
ANNETTE         5000 m         30 C

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD




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


END/