FNUS73 KDMX 250920
FWSDMX

SPOT FORECAST FOR THORN VALLEY...USFWS
NATIONAL WEATHER SERVICE DES MOINES IA
420 AM CDT TUE OCT 25 2011

FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON OCTOBER 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

PLEASE REMEMBER TO SUBMIT A MID BURN OBSERVATION TO THE NATIONAL WEATHER
SERVICE FOR EACH PRESCRIBED BURN.

.DISCUSSION...WARM AND BREEZY CONDITIONS TODAY WILL GIVE WAY
TO MUCH COLDER WEATHER ON WEDNESDAY. WINDS WILL REACH 15 TO 25 MPH
LATER THIS MORNING OVER MUCH OF THE AREA WITH THE EXCEPTION OF
NORTH CENTRAL IOWA WHERE WINDS WILL BE LIGHTER THIS AFTERNOON.
FROM SOUTH CENTRAL THROUGH SOUTHEAST IOWA WINDS MAY GUST TO NEAR
30 MPH AT TIMES THIS AFTERNOON. SHOWERS ARE EXPECTED OVER
SOUTHERN IOWA WEDNESDAY WITH DRY AND COOL WEATHER FOR THE
REMAINDER OF THE WEEK.

.TODAY...

SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT).
MAX TEMPERATURE.....AROUND 78.
MIN HUMIDITY........43 PERCENT.
EYE LEVEL WINDS.....SOUTH WINDS 13 TO 17 MPH.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1600 FT AGL INCREASING TO 3700 FT AGL LATE IN
                    THE MORNING...THEN INCREASING TO 5600 FT AGL IN
                    THE AFTERNOON DECREASING TO 2000 FT AGL LATE IN
                    THE AFTERNOON.
MIXING WINDS........SOUTH 9 TO 18 MPH SHIFTING TO THE WEST 8 TO 14
                    MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (18800 KNOT-FT) INCREASING TO GOOD (80500
                    KNOT-FT) LATE IN THE MORNING...THEN INCREASING
                    TO EXCELLENT (101000 KNOT-FT) EARLY IN THE
                    AFTERNOON DECREASING TO GOOD (89800 KNOT-FT)
                    LATE IN THE AFTERNOON.
WIND (20 FT)........SOUTHWEST WINDS 13 TO 17 MPH.

TIME (CDT)      7 AM      10 AM     1 PM      4 PM
SKY (%).........51        49        48        53
WEATHER COV.....
WEATHER TYPE....NONE      NONE      NONE      NONE
TSTM COV........
TEMP............55        64        74        76
RH..............80        65        50        43
20 FT WIND......S 13G15   S 16G20   SW 17G20  W 14G20
EYE LEVEL WIND..S 9G15    S 11G20   SW 12G20  W 10G20
MIX HGT (FT)....300       1600      4700      5600
MIXNG WIND......S 9       S 23      SW 24     SW 18
HAINES INDEX....5         3         2         3

$$
FORECASTER...VACHALEK
REQUESTED BY...JAMES KRIZMAN
TYPE OF REQUEST...PRESCRIBED
.TAG 20111025.THORN.01/DMX