FPCN39 CWLW 311433
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 31 MARCH 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      21    7     650   3     47   11    1700   3
KAMLOOPS     KEL      21    6     800   3     42   10    1750   3
OKANAGAN     KEL      21    6     800   3     42    9    1650   3
CASTLEGAR    SPOK     11    3     800   2     49    9    1500   7
CRANBROOK    SPOK     11    3     950   2     45    7    1450   4
REVELSTOKE   KEL      18    5     800   3     36    8    1550   3

*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   VR   5   NW   9
CRANBROOK             VR   5   SW  19

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          700 m          7 C
SPOKANE          700 m          7 C

TODAY'S VENTING: FAIR.

VENTING FOR WEDNESDAY: FAIR.

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.     25    3    1250   2     82    8    2950   5
PR. GEORGE   P.G.     32    2    1100   3     82    8    3000   5
SMITHERS     P.G.     18    2     800   3     80    9    2800   5
WELLS GRAY   P.G.     30    4    1400   5    100    9    3500   6
FT NLSN      F.N.     32    4    1000   5    100    9    3400   6
FT STJOHN    F.N.     72    2    1250  10    100    6    3700  14

*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            NW  13   NW   9
SMITHERS              N   13   N    9

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2000 m          5 C
FT. NELSON      1000 m          5 C

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: FAIR TO GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     37    8    1100   5     78   11    1600   8
FRASER VLY   QUIL     30    8     900   5     69   11    1600   8
SRN VRISL    QUIL     32    8     700   5     79   11    1550   8
CNTRL VRISL  QUIL     22    7     350   5     77   11    1550   6
NRN VRISL    HRDY     12    4     150   3     47    9    1250   6
TERRACE      ANT       9    3     200   3     77    7    1750   6
STEWART      ANT       9    3     200   5     66    7    1050  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
VANCOUVER    W    9   SW   9   S   17
PORT HARDY   N   22   N   20   N   20
SANDSPIT     N    9   N   15   N   19

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       300 m          7 C
PORT HARDY       200 m          7 C
ANNETTE          MSG            MSG

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: FAIR TO GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: FAIR TO GOOD.


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


END/MWSO