424
FXUS63 KFSD 071617
AFDFSD
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1015 AM CST SAT NOV 7 2009
DISCUSSION
PLENTY OF SUN EXPECTED ACRS CWA. ANOTHER MILD DAY. SFC HIGH OVR
SCNTRL SD THIS AM WL DRIFT EWD THIS AFTN. WNDS SHUD ACTUALLY BECOME
LIGHTER. WEAK CAA ACRS NRN CWA WL PBLY KEEPS HIGH TEMPS COOLER THAN
FRI BUT STILL WELL ABOVE NORM. SEE NO REASON TO ADJUST TEMP GRIDS
FOR THIS AFTN ATTM.
AVIATION
VFR THRU 12Z SUN. MAY SEE MVFR CIGS DEVELOP AFTER 12Z SUN S OF I90
AS LLM INCREASE FM THE S.
PREVIOUS DISCUSSION
ZONAL FLOW MAKING FOR ANOTHER IN A SERIES OF NICE DAYS TODAY. COLD
FRONT WHICH ATTM IS PUSHING ACROSS THE SRN CWA WILL COOL THINGS OFF
SOME FROM YESTERDAY. MOST OF THE AREA WILL BE 5 TO 10 DEGREES COOLER
...ALTHOUGH TEMPERATURES IN NW IA WILL BE SIMILAR TO YESTERDAY WITH
HIGHS IN THE MID TO UPPER 60S. WILL START THE MORNING OFF UNDER
CLEAR SKIES...BUT THEN WILL SEE SLOWLY INCREASING HIGH CLOUDS
THROUGH THE DAY.
INCREASING CLOUDS TO CONTINUE INTO SUN AS A WEAK AND DISORGANIZED
WAVE SLIPS ACROSS THE NRN PLAINS. MOISTURE WITH THIS WAVE IS LIMITED
BUT CAN NOT RULE OUT ISOLATED SHOWERS OR SPRINKLES ALONG AND EAST OF
I29. THERE MAY BE JUST ENOUGH MID LEVEL COOLING AND CONVERGENCE TO
SQUEEZE OUT A BIT OF MOISTURE. CHANCES FOR MEASURABLE PRECIPITATION
VERY LOW...SO ONLY HAVE MENTION OF INSTABILITY SHOWERS INTO SW MN
SUN AFTERNOON AND DRY ELSEWHERE. SUN SHOULD BE A BIT COOLER SUN
DESPITE SRLY RETURN FLOW...AS INCREASED CLOUD COVER HOLDS
TEMPERATURES DOWN.
NRLY LOW LEVEL FLOW WILL BRING IN SLIGHTLY COOLER AIR MON...WHILE
HIGH PRESSURE SETTLES ACROSS THE AREA. SHOULD BE A DRY DAY...BUT
MAY BE ABLE TO RING OUT A FEW HUNDREDTHS OF MOISTURE TOWARDS THE MO
VALLEY...DEPENDING ON TIMING AND STRENGTH OF A MIDLEVEL FRONT. AT
THIS TIME HAVE NO MENTION OF POPS AS IT LOOKS LIKE THE MIDLEVEL
BNDRY WILL SIT JUST S INTO NEBRASKA. HIGH PRESSURE AXIS TO DRIFT
ACROSS THE CWA MON NIGHT...SO CLEAR SKIES AND LIGHT WINDS WILL BE
THE RULE. SHOULD BE A MAX RADIATION TYPE NIGHT...THUS HAVE LOW
TEMPERATURES A GOOD 3 TO 4 DEGREES BELOW GUIDANCE.
DRY ZONAL FLOW TO REMAIN IN PLACE THROUGH LATE THIS WEEK...SO LITTLE
TO NO CHANCE OF PRECIPITATION THROUGH THIS TIME FRAME. ZONAL FLOW
PATTERN MAY BEGIN TO BREAK DOWN TOWARDS THE WEEKEND BUT STILL A LOT
OF UNCERTAINTY IN THE FLOW PATTERN AT THAT POINT. 97
FSD WATCHES/WARNINGS/ADVISORIES
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.
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