FNUS73 KDMX 271413
FWSDMX

SPOT FORECAST FOR GRASS LAKE...IOWA DNR
NATIONAL WEATHER SERVICE DES MOINES IA
913 AM CDT TUE MAR 27 2012

FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON MARCH 28.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

AN INITIAL OBSERVATION AT IGNITION AND A MID BURN OBSERVATION ARE REQUIRED...
PLEASE RELAY THEM TO THE NATIONAL WEATHER SERVICE FOR EACH PRESCRIBED BURN.

...WIND ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.DISCUSSION...
BREEZY NORTHWEST WINDS WILL PREVAIL ON WEDNESDAY THOUGH WILL BE
DIMINISHED FROM THE GUSTY CONDITIONS TODAY. RELATIVE HUMIDITY
VALUES WILL DROP INTO THE 30S BY THE AFTERNOON. STRONG MIXING
CONDITIONS WILL BE IN PLACE LEADING TO EXCELLENT SMOKE DISPERSAL.

.WEDNESDAY...

SKY/WEATHER.........SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....AROUND 61.
MIN HUMIDITY........38 PERCENT.
EYE LEVEL WINDS.....NORTH WINDS 9 TO 13 MPH.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......1900 FT AGL INCREASING TO 5000 FT AGL LATE IN
                    THE MORNING...THEN INCREASING TO 5300 FT AGL
                    LATE IN THE AFTERNOON DECREASING TO 2000 FT AGL
                    LATE IN THE AFTERNOON.
MIXING WINDS........NORTHWEST 8 TO 17 MPH INCREASING TO 14 TO 23
                    MPH IN THE LATE MORNING AND AFTERNOON.
SMOKE DISPERSAL.....POOR TO POOR (1800-4900 KNOT-FT) INCREASING TO
                    POOR TO EXCELLENT (7300-62100 KNOT-FT) LATE IN
                    THE MORNING...THEN INCREASING TO EXCELLENT TO
                    EXCELLENT (90600-94000 KNOT-FT) EARLY IN THE
                    AFTERNOON DECREASING TO FAIR TO EXCELLENT
                    (23800-84000 KNOT-FT) LATE IN THE AFTERNOON.
WIND (20 FT)........NORTH WINDS 12 TO 17 MPH.

TIME (CDT)      7 AM   9 AM   11 AM  1 PM   3 PM   5 PM
SKY (%).........14     13     12     11     11     11
WEATHER COV.....
WEATHER TYPE....NONE   NONE   NONE   NONE   NONE   NONE
TSTM COV........
TEMP............41     45     50     56     60     61
RH..............76     65     56     45     39     38
20 FT WIND......NW 12  NW 15  NW 17  NW 17  NW 16  N 14
20 FT WIND GUST.15     20     25     25     25     20
EYE LEVEL WIND..NW 9   NW 11  NW 12  NW 12  NW 11  N 10
EYE LVL WND GST.15     20     25     25     25     20
MIX HGT (FT)....300    400    1900   4600   5000   3600
MIXNG WIND......W 8    NW 14  NW 20  NW 23  NW 21  NW 16
HAINES INDEX....4      4      4      3      4      4

$$
FORECASTER...DONAVON
REQUESTED BY...DAVE WHITE
TYPE OF REQUEST...PRESCRIBED
.TAG 20120328.GRASS.01/DMX