FNUS73 KLSX 211154
FWSLSX

SPOT FORECAST FOR MARK TWAIN LAKE...CORPS OF ENGINEERS
NATIONAL WEATHER SERVICE ST LOUIS MO
654 AM CDT WED APR 21 2010

FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON APRIL 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE
NATIONAL WEATHER SERVICE.

.DISCUSSION...
UPPER LEVEL DISTURBANCES WILL BRING A CHANGE OF SHOWERS TO NORTHEAST AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL ILLINOIS TODAY.  MINIMUM RELATIVE
HUMIDITY VALUES WILL BE QUITE LOW AGAIN AT AROUND 30 PERCENT THIS AFTERNOON
ACROSS SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS.  THE SURFACE WIND WILL
CONTINUE TO BE WEAK TODAY AND TONIGHT THEN SOUTHERLY OR SOUTHEASTERLY ON
THURSDAY.  THERE WILL BE A CHANCE OF SHOWERS AND THUNDERSTORMS ON THURSDAY
ACROSS CENTRAL AND SOUTHEAST MISSOURI AS WELL AS A PORTION OF SOUTHWEST
ILLINOIS.  THE CHANCE OF SHOWERS AND THUNDERSTORMS WILL INCREASE OVER THE
ENTIRE AREA THURSDAY NIGHT AS A WARM FRONT APPROACHES FROM THE SOUTHWEST.


.REST OF TODAY...

SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS.
CWR.................30 PERCENT.
LAL.................NO TSTMS.
MAX TEMPERATURE.....68.
MIN HUMIDITY........36 PERCENT.
WIND...EYE LEVEL....NORTHWEST WIND 3 MPH IN THE LATE MORNING
                    SHIFTING TO THE NORTH AROUND 4 MPH EARLY IN
                    THE AFTERNOON...THEN SHIFTING TO THE NORTHEAST
                    AROUND 3 MPH LATE IN THE AFTERNOON.
WIND...20 FT........NORTHWEST WIND 7 MPH IN THE LATE MORNING
                    SHIFTING TO THE NORTH AROUND 8 MPH EARLY IN
                    THE AFTERNOON...THEN SHIFTING TO THE NORTHEAST
                    AROUND 6 MPH LATE IN THE AFTERNOON.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......8100 FT AGL AT MAX HEATING.
TRANSPORT WINDS.....WEST AROUND 10 MPH.
VENTILATION RATE....GOOD (11485 M 2/S) AT MAX HEATING.

$$

FORECASTER...GKS
REQUESTED BY...ALLEN MEHRER
TYPE OF REQUEST...PRESCRIBED
.TAG 20100421.MARKT.01/LSX