Area Forecast Discussion
Issued by NWS Quad Cities, IA IL

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000
FXUS63 KDVN 272326
AFDDVN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
626 PM CDT SUN JUL 27 2014

.SHORT TERM...(THIS EVENING THROUGH MONDAY)
ISSUED AT 314 PM CDT SUN JUL 27 2014

TONIGHT...VIGOROUS VORT MAX NOTED ACRS THE SOUTH HALF OF WI...WITH
LLVL TROF SPOKE REFLECTION EXTENDING FROM NW MN ACRS CENTRAL WI AND
TOWARD SFC LOW OVER LOWER MI. PART OF THIS TROF TO MAKE IT ACRS THE
NORTHEASTERN CWA OVERNIGHT...BUT BY THEN HEATING OF THE DAY WILL BE
WELL OVER AND WILL WALK OUT ANY LINGERING/ISOLATED SHOWERS IN THE
NORTHEASTERN CWA BY 02Z. IN-WRAPPING CU/STRATOCU WILL START TO
DECREASE DIURNALLY AFTER SUNSET...BUT MAY HANG ON ACRS THE
NORTHEASTERN HALF LONG ENOUGH THROUGH LATE EVENING TO WARRANT
PARTLY CLOUDY TO EVEN PERIODS OF MOSTLY CLOUDY WORDING IN THESE
AREAS THROUGH 11 PM OR LATER. NORTHWEST BOUNDARY LAYER FLOW TO KEEP
COOL AIR/DRY ADVECTING OVERNIGHT AND WILL KEEP WIDESPREAD LOW
TEMPS IN THE MID TO UPPER 50S GOING...WITH SOME LOWER 50S POSSIBLE
NEAR THE HWY 20 CORRIDOR IF CLOUD COVER CAN CLEAR ENOUGH. IF IT
WERE NOT FOR THE MIXING NORTHWEST SFC WINDS MAINTAINING 7-12 KTS
OVERNIGHT IN IN-BUILDING HIGH PRESSURE GRADIENT...THERE MIGHT BE A
SHOT AT RECORD OR NEAR RECORD LOW TEMPS AT DBQ AND MLI.

MONDAY...CANADIAN HIGH PRESSURE TO CONTINUE TO ENGULF THE PLAINS AND
UPPER MS RVR VALLEY...WITH INCOMING GRADIENT STILL LINGERING ENOUGH
TO MAKE FOR NORTH WINDS OF 10 TO 20 MPH THROUGH EARLY AFTERNOON
BEFORE STARTING TO RELAX AGAIN. AMPLIFYING NORTHWEST STEERING FLOW
WILL LOOK TO USHER DOWN ANOTHER VORT COMPLEX ACRS NORTHWEST INTO
CENTRAL IA...WITH SEVERAL MODELS BREAKING OUT LIGHT SHOWERS ACRS
CENTRAL INTO EASTERN IA AS THE DAY PROGRESSES. WHILE LLVL LAPSE
RATES WILL BE VERY STEEP AGAIN...BUILDING LOW TO MID LEVEL INVERSION
JUST ABOVE THE MIXED LAYER MAY LIMIT MUCH IN THE WAY OF PRECIP
GENERATION. PLUS LLVL MOISTURE SOURCES DRY MIXING OUT. WILL KEEP THE
FCST DRY FOR NOW...WITH JUST MORE CELLULAR CU OF SCTRD TO BKN
LEVELS FORMING AGAIN BY AFTERNOON. DESPITE ROBUST LLVL MIXING...
INCOMING COOL POOL LOOKS TO BE TO AN EXTENT THAT HIGH TEMPS WILL BE
LIMITED TO THE 70S/WELL BELOW NORMAL...ONGOING HIGHS LOOK GOOD AND
WILL MAKE LITTLE CHANGE.     ..12..

.LONG TERM...(MONDAY NIGHT THROUGH NEXT SUNDAY)
ISSUED AT 314 PM CDT SUN JUL 27 2014

MEDIUM RANGE MODELS CONTINUE TO BE IN GOOD AGREEMENT WITH DEVELOPING
A HIGH AMPLITUDE RIDGE /HEAT DOME/ OVER THE WESTERN US WITH A DEEP
TROUGH OVER THE EASTERN CONUS. THIS UPPER AIR PATTERN WILL CREATE A
PROLONGED NORTHWEST FLOW ALOFT OVER THE MIDWEST. PLEASANT CONDITIONS
ARE EXPECTED THIS WEEK AS HIGH PRESSURE BUILDS IN FROM THE NORTH
BRINGING BELOW NORMAL TEMPERATURES AND LOW HUMIDITY. HIGHS WILL BE
IN THE UPPER 70S TO AROUND 80 WITH OVERNIGHT LOWS IN THE UPPER 50S
AND LOWER 60S. LATE IN THE WEEK/NEXT WEEKEND THE LONG RANGE MODELS
INDICATE THERE IS A CHANCE OF SHOWERS OR THUNDERSTORMS WITH WARMING
SURFACE TEMPERATURES AND SHORTWAVES ROTATING THROUGH NORTHWEST FLOW
ALOFT.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z MONDAY EVENING)
ISSUED AT 625 PM CDT SUN JUL 27 2014

CANADIAN HIGH PRESSURE WILL CONTINUE TO BUILD SOUTHEAST INTO THE
REGION TONIGHT AND MONDAY WHILE A LOW PRESSURE SYSTEM OVER THE
GREAT LAKES EXITS TO THE EAST. THIS WILL RESULT IN DIMINISHING
WINDS AND CONTINUED VFR CONDITIONS. ISOLATED SHOWERS WILL BE ON-
GOING OVER EASTERN IA EARLY THIS EVENING...ESPECIALLY AT CID.
THESE ARE EXPECTED TO RAPIDLY DIMINISHING AT SUNSET.

&&

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

$$

SHORT TERM...12
LONG TERM...KUHL
AVIATION...SHEETS





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