River Flood Warning 42, NWS Quad Cities, IA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
325 AM CDT TUE MAR 24 2009

.SYNOPSIS...
THE LONG SINCE OCCLUDED SURFACE LOW AND UPPER LOW CONTINUE TO SPIN
OVER CENTRAL MN EARLY THIS MORNING.  THE DRY SLOT IS GRADUALLY
GIVING WAY TO WRAP AROUND MOISTURE WITH STRATO CUMULUS NOW OVER
NEARLY ALL OF IOWA...AND BY SUNRISE...THIS SHOULD COVER MUCH OF OUR
ILLINOIS AND NORTHEAST MO COUNTIES AS WELL.  TODAYS WEATHER WILL
GENERALLY BE DETERMINED BY THIS CLOUD COVER. THE EXTENDED FORECAST
REMAINS PLAGUED BY A SEEMINGLY ENDLESS LINE OF POTENTIAL SIGNIFICANT
SYNOPTIC STORMS.

&&

.SHORT TERM...TODAY AND TONIGHT...
MODELS ARE OVER DONE ON THE EASTERN EXTENT OF STRATUS THIS MORNING...
BUT ARE UNDER DONE ON THE SOUTHERN EXTENT.  WE WILL INITIALLY GO
AHEAD AND FORECAST THE CLOUDS TO SPREAD THROUGH THE EASTERN CWA EARLY
THIS MORNING. CLOUDS SHOULD REMAIN IN PLACE ALL MORNING...BEFORE
GIVING WAY FROM SOUTH TO NORTH DURING THE AFTERNOON. THIS PROCESS MAY
TAKE UNTIL EARLY EVENING NORTH...AND WE WILL HOLD HIGHS DOWN IN THE
MID 40S THERE. OTHERWISE...UPPER 40S TO LOWER 50S SHOULD BE THE RULE
UNDER MODEST MIXING DURING THE AFTERNOON WITH PARTIAL TO FULL SUN
LATE IN THE DAY. IT WILL BE BRISK WITH WEST WINDS AROUND 15 MPH ALL
DAY...GUSTING TO ABOUT 25 AT TIMES.  TONIGHT...MID AND HIGH CLOUDS
SHOULD SPREAD OVER THE AREA...AS THE NEXT STORMS SYSTEMS ENERGY CLIPS
THE REGION.     ..ERVIN..

.LONG TERM...THURSDAY THROUGH NEXT TUESDAY...
THU SHAPING UP TO BE A DECENT DAY WITH AT LEAST PARTIAL INSOLATION
AND THERMAL MODIFICATION TO THE TUNE OF HIGHS IN THE MID 50S TO
AROUND 60. LATEST SUITE OF 00Z RUN MODELS NOW A BIT MORE BULLISH
WITH ELEVATED ISENTROPIC TYPE LIFT ACRS AT LEAST THE SOUTHERN CWA
THU NIGHT FOR AT LEAST LIGHT RAIN OR SPRINKLES DEPENDING ON EVENTUAL
LOW TO MID LEVEL SATURATION AND TIGHTENING LLVL BAROCLINICITY. THE
00Z GFS CONTINUES O BE MOST BULLISH ON NORTHWEST LIFT AND LLVL
INVERTED TROF DEVELOPMENT THU NIGHT FOR A POTENTIALLY SIGNIFICANT
PRECIP EVENT IMPACTING AT LEAST THE SOUTH HALF OF THE DVN CWA LATE
THU NIGHT INTO FRI...WITH NORTHERN SECTIONS EVAPO-COOLING INTO SNOW
PROFILES/ PARAMETERS. WITH STILL SOME UNCERTAINTY...WILL KEEP SLIGHT
CHC ACRS THE SOUTH FOR LIGHT RAIN THU NIGHT...AND INCREASING POPS
FURTHER TO THE NORTH ON FRI FOR ALL RAIN. THE NEW 00Z RUN ECMWF AND
UKMET ARE MAINLY DRY FRI AND MUCH OF FRI NIGHT WITH DRYING INFLUX OF
NNE FETCH AIRMASS AND SLOWER ARRIVAL OF THE NOW WELL ADVERTISED LARGE
SLUG OF WAVE ENERGY THAT WILL EVENTUALLY LIFT OUT SOMEWHERE ACRS THE
MIDWEST AND GRT LKS OVER THE WEEKEND. STILL MUCH UNCERTAINTY WITH THE
PROPAGATION OF THE MAIN H5 MB LOW AS WELL AS THE SFC LOW OF COURSE
BETWEEN THE MEDIUM RANGE MODELS...WITH THE NEW ECMWF THE FURTHEST TO
THE SOUTHEAST WITH HEAVY PRECIP ALONG AND EAST OF THE DVN CWA...WHILE
THE CANADIAN IS THE FURTHER NORTHWEST FOR HEAVY RAIN ACRS THE WESTERN
CWA AN MUCH MILDER TEMPS ON SAT. WILL KEEP GENERALIZED HAPPY MEDIUM
FCST GOING ONE MORE NIGHT AND HOPE FOR SOME MORE CONSISTENCY OVER THE
NEXT 24 HRS TO HAMMER OUT A MORE CERTAIN SOLUTION WITH RESPECT TO
PLACEMENT AND TYPE OF SIGNIFICANT PRECIP FROM FRI NIGHT THROUGH SAT
NIGHT. WILL MAKE SUNDAY DRY...OTHERWISE NOT MUCH CHANGE PAST 12Z
SUNDAY FOR NOW.     ..12..

&&

.AVIATION...
MVFR CIGS WILL CONTINUE AT DBQ AND CID THROUGH LATE MORNING...BEFORE
CIG HEIGHTS RISE TO AROUND 3500 FT DURING THE AFTERNOON. MLI AND BRL
MAY SEE TEMPORARY CIGS DOWN TO 3000 FT THIS MORNING...BUT WILL BE
GENERALLY VFR...WITH CONSISTENT VFR CONDITIONS AFTER 17Z.
VISIBILITIES WILL BE GOOD IN ALL SITES TODAY...AND WINDS WILL BE
WESTERLY AROUND 15 KTS...GUSTING TO 20 KTS. TONIGHT...WINDS WILL BE
LIGHT SOUTHERLY.    ..ERVIN..
&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.

&&

ERVIN/12

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