Special Weather Statement, NWS Quad Cities, IA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
250 PM CDT FRI JUN 10 2011

.SYNOPSIS...
MODEL INITIALIZATION WAS ADEQUATE WITH PROBLEMS HANDLING COOL LOW LEVEL
MOISTURE NORTH OF STATIONERY BOUNDARY ACROSS NORTH HALF OF FORECAST
AREA.  AT 2 PM...TEMPERATURES SHOW TYPICAL STRONG GRADIENT FROM LAKE
MICHIGAN ENHANCED FLOW NORTH OF BOUNDARY WITH LOWER 60S NORTH 1/3 TO
MID/UPPER 70S SOUTH 1/4 ALONG AND SOUTH OF STALLED FRONT. LOW CLOUDS
DRAPED ALONG AND JUST NORTH OF HIGHWAY 30 WITH DIURNAL FORCED
FRONTOGENESIS ONGOING.  PRESSURE RISE AND FALL COUPLETS SUGGEST RISK OF
NEAR SEVERE TO SEVERE STORMS SOUTHEAST 1/4 WITH SOME ELEVATED CONVECTION
NORTH OF FRONT. TIMING OF FIRING SUGGESTS BETWEEN 3 AND 5 PM.  MAIN
THREAT FROM LOCAL TOOLS IS HAIL UP TO 1.25 INCHES WITH LOCALE AROUND
MACOMB POSSIBLY TO SEE SOME ROTATION THAT WILL NEED MONITORING UNTIL
ABOUT 7-8 PM WITH COOL FRONTAL PASSAGE. DAMAGING WINDS OF 60 MPH MOST
LIKELY TO OCCUR SOUTHEAST OF FORECAST AREA. UPPER AIR ANALYSIS SHOWS
GOOD NORTHWEST FLOW TO ALLOW FOR BELOW NORMAL TEMPERATURES INTO EARLY
NEXT WEEK.

&&

.SHORT TERM...TONIGHT AND SATURDAY...
TONIGHT...LIKELY POPS SE 1/2 WITH CHANCE POPS NW WITH MAINLY EVENING
SHOWERS AND STORMS.  HAVE SEVERE WORDING UNTIL 04Z OR 11 PM LOCAL
ALONG AND ESPECIALLY SOUTHEAST OF A PRINCETON ILLINOIS TO MONMOUTH
ILLINOIS TO KEOSAUQUA IOWA LINE.  CURRENT SCENARIO SUGGEST ANY SEVERE
RISK MAY BE ONLY 1-3 HOURS LONG BEFORE SATURATION AND STRATIFICATION
OCCURS DUE TO MODEST HEATING TODAY.  LOCALLY HEAVY RAINS OF AN INCH
TO NEAR 1.5 INCHES ARE POSSIBLE WITH STRONGEST STORMS IN FAR SE BUT
LIMITED TRAINING SUGGESTED EXCEPT NEAR MACOMB AREA.  LOCAL FLASH
GUIDANCE SUGGEST NEAR 2 INCH AMOUNTS NEEDED THERE.  NORTH OF HIGHWAY
34 PRECIPITATION SHOULD BE LIGHT AND GENERALLY LESS THAN QUARTER TO A
TENTH OF A INCH WITH MANY SPOTS ALONG HIGHWAY 20 CORRIDOR TO STAY
DRY.  MINS TONIGHT WITH PATCHY FOG AFTER 06Z IN THE 50S TO NEAR 60F
DEGREES ALONG AND SOUTH OF HIGHWAY 34. FOG MAY BECOME LOCALLY DENSE
IF WINDS BECOME LIGHT FOR LATER SHIFTS TO MONITOR.

SATURDAY...PATCHY TO AREAS OF FOG AND LOW CLOUDS SHOULD DISSIPATE
BETWEEN 10 AM AND 1 PM WITH PARTLY TO MOSTLY SUNNY SKIES IN THE
AFTERNOON WITH FAIR WEATHER CUMULUS CLOUDS UNTIL LATE AFTERNOON. HIGHS
TO SETTLE IN THE UPPER 60S NORTHEAST TO LOWER 70S SW SECTIONS FOR A
SPLENDID JUNE DAY WITH MODESTLY LOW HUMIDITY ON NORTH WINDS OF 5 TO 15
MPH.  ..NICHOLS..

.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY...
UPPER RIDGING OVER THE PLAINS SATURDAY EVENING WILL MOVE INTO THE
MISSISSIPPI VALLEY BY LATE SUNDAY WITH THE SURFACE RIDGE MOVING FROM
THE MID/UPPER MISSISSIPPI VALLEY INTO THE WESTERN GREAT LAKES.  LOW
LEVEL RIDGING WILL KEEP QUIET WEATHER OVER THE AREA SATURDAY NIGHT.
LIGHT WINDS AND MOSTLY CLEAR SKIES OVER THE AREA WILL KEEP
TEMPERATURES WELL BELOW NORMAL.  FAVORED THE COOLER GUIDANCE FOR
MINS SUNDAY MORNING...BUT NUDGED TEMPS IN THE SOUTHWEST UP A LITTLE
DUE TO EXPECTED LATE NIGHT INCREASE IN CLOUDS AHEAD OF A S/W MOVING
IN BEHIND THE UPPER RIDGE.  HAVE CONTINUED TO DOWN PLAY
PRECIPITATION CHANCES SUNDAY WITH THE S/W SINCE PRECIPITATION WILL
BE BATTLING DRY LOW LEVEL EASTERLY FLOW DURING THE DAY.  IF ANY
PRECIPITATION OCCURS IT MAY END UP BEING A FEW SPRINKLES OR VIRGA.
KEPT LOW CHANCE OR SLIGHT CHANCE POPS LIMITED TO THE FAR SW.  ALSO
DOWN PLAYED ANY THUNDER POTENTIAL WITH MODELS SHOWING LITTLE IF ANY
SURFACE BASED OR ELEVATED CAPE. MID/HIGH CLOUDS WITH THE S/W WILL
HOLD TEMPERATURES DOWN OVER THE AREA AND KEPT HIGHS IN THE LOW TO
MID 70S. SUNDAY NIGHT MODELS SHOW A DECENT LLJ DEVELOPING AHEAD OF
ANOTHER MINOR S/W MOVING OUT OF THE PLAINS. HAVE KEPT THE HIGHER
POPS IN THE SW CLOSER TO THE BETTER MOISTURE/FORCING.  PRECIPITATION
WILL HAVE A HARD TIMING HOLDING TOGETHER AS IT MOVES EAST AND RUNS
INTO THE MID LEVEL RIDGING STALLED OVER THE MISSISSIPPI RIVER
VALLEY.  MODELS CONTINUE TO SHOW GOOD WARM/MOIST LOW LEVEL ADVECTION
OVER THE AREA INTO THE MONDAY..SO HELD ON TO SOME LOW POPS OVER THE
SOUTHWEST HALF.

FOR MONDAY NIGHT THROUGH WEDNESDAY MODELS ARE IN AGREEMENT WITH
ANOTHER UPPER TROF MOVING FROM THE PACIFIC NW INTO THE NORTH CENTRAL
U.S.  THIS WILL KEEP A CHANCE OF TSRA IN THE FORECAST THROUGH MID
WEEK.  AFTER WEDNESDAY THERE IS MORE UNCERTAINTY IN THE MODELS WITH
A SECOND TROF PROGGED TO MOVE THROUGH THE PAC NW.  THE GFS SHOWS
MORE AMPLIFIED SYSTEM WHILE THE  ECMWF IS FLATTER. WILL KEEP
THURSDAY DRY FOR NOW AND GO WITH LOW CHANCE POPS FOR FRIDAY. ..DLF..

&&

.AVIATION...
MVFR TO IFR WX TO OVERSPREAD ALL TERMINALS BETWEEN 20Z-04Z BEHIND
COOL FRONT.  BRL AND ALSO POSSIBLY MLI TERMINAL TO EXPERIENCE RISK OF
STORMS WITH VSBYS OF 1-3 MILES IN RAIN UNTIL 04Z. DBQ AND CID COULD
SEE SHRA WITH VSBYS OF 2 TO 5 MILES UNTIL 04Z. AFTER 04Z... TERMINALS
TO HAVE CIGS OF 500-1500' AGL AND VSBYS OF 1-5 MILES IN FOG UNTIL 16-
18Z. AFTER 18Z...VFR WITH FEW-SCT CLOUDS OF 2-3K AGL AND VSBYS AOA 7
MILES.   ..NICHOLS..

&&

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

&&

NICHOLS/DLF

HAZARDOUS WEATHER OUTLOOK...CORRECTED DAY ONE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
758 PM CDT FRI JUN 10 2011

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-110930-
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON-
WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
758 PM CDT FRI JUN 10 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS WILL BE FOUND THIS EVENING... ESPECIALLY
ALONG AND NORTH OF INTERSTATE 80. LIGHTNING AND SMALL HAIL WILL
BE THE MAIN THREATS.

PATCHY DENSE FOG WILL BE POSSIBLE ACROSS THE OUTLOOK AREA OVERNIGHT.

AREA RIVERS ARE EXPERIENCING FLOODING. PLEASE SEE THE LATEST
FLOOD STATEMENTS AND FLOOD WARNINGS FOR DETAILS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS RETURN TO THE FORECAST BEGINNING SUNDAY...AND
CONTINUING THROUGH WEDNESDAY AS AN UPPER LEVEL DISTURBANCE MOVES
ACROSS THE MIDWEST. AT THIS TIME IT IS TOO SOON TO DETERMINE THE
RISK OF SEVERE WEATHER.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THE REST OF TONIGHT AND
TOMORROW.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
659 PM CDT FRI JUN 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0625 PM     HAIL             W WEST POINT            40.26N 91.19W
06/10/2011  E0.75 INCH       HANCOCK            IL   TRAINED SPOTTER

            DIME TO PENNY SIZE HAIL

0625 PM     TSTM WND DMG     W WEST POINT            40.26N 91.19W
06/10/2011                   HANCOCK            IL   TRAINED SPOTTER

            12 INCH DIAMETER TREE BRANCH DOWN ALONG WITH SEVERAL
            OTHER SMALLER BRANCHES AND TREE LIMBS.

&&

MCCLURE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
702 PM CDT FRI JUN 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0700 PM     TSTM WND DMG     BOWEN                   40.23N 91.06W
06/10/2011                   HANCOCK            IL   TRAINED SPOTTER

            POWER LINES DOWN EAST OF BOWEN. POWER OUTAGE IN BOWEN.

&&

BILLN

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
704 PM CDT FRI JUN 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0650 PM     TSTM WND DMG     BOWEN                   40.23N 91.06W
06/10/2011                   HANCOCK            IL   TRAINED SPOTTER

            POWER LINES DOWN EAST OF BOWEN. POWER OUTAGE IN BOWEN.

&&

BILLN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
712 PM CDT FRI JUN 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0645 PM     TSTM WND DMG     AUGUSTA                 40.23N 90.95W
06/10/2011                   HANCOCK            IL   FIRE DEPT/RESCUE

            LARGE TREE DOWN. REPORT FROM AUGUSTA FIRE DEPARTMENT
            RELAYED BY HANCOCK COUNTY SHERIFFS OFFICE.

0645 PM     HAIL             AUGUSTA                 40.23N 90.95W
06/10/2011  E2.75 INCH       HANCOCK            IL   FIRE DEPT/RESCUE

            GOLF BALL TO BASEBALL SIZED HAIL. REPORT FROM AUGUSTA
            FIRE DEPARTMENT RELAYED BY HANCOCK COUNTY SHERIFFS
            OFFICE.

&&

MCCLURE

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
747 PM CDT FRI JUN 10 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0511 PM     HAIL             2 E RUTLEDGE            40.31N 92.05W
06/10/2011  E0.75 INCH       SCOTLAND           MO   LAW ENFORCEMENT

            PEA TO DIME SIZE HAIL SO FAR.

0514 PM     HAIL             N FAIRMONT              40.33N 91.90W
06/10/2011  E1.00 INCH       CLARK              MO   TRAINED SPOTTER

            TIME ESTIMATED FROM RADAR.

0555 PM     HAIL             3 ESE WINCHESTER        40.30N 91.55W
06/10/2011  E1.75 INCH       CLARK              MO   TRAINED SPOTTER

0625 PM     HAIL             W WEST POINT            40.26N 91.19W
06/10/2011  E0.75 INCH       HANCOCK            IL   TRAINED SPOTTER

            DIME TO PENNY SIZE HAIL

0625 PM     TSTM WND DMG     W WEST POINT            40.26N 91.19W
06/10/2011                   HANCOCK            IL   TRAINED SPOTTER

            12 INCH DIAMETER TREE BRANCH DOWN ALONG WITH SEVERAL
            OTHER SMALLER BRANCHES AND TREE LIMBS.

0640 PM     TSTM WND GST     ESE BOWEN               40.23N 91.06W
06/10/2011  E60.00 MPH       HANCOCK            IL   TRAINED SPOTTER

            ESTIMATED 55 TO 60 MPH. LOTS OF SMALL LIMBS DOWN.

0640 PM     HAIL             ESE BOWEN               40.23N 91.06W
06/10/2011  E1.25 INCH       HANCOCK            IL   TRAINED SPOTTER

0645 PM     HAIL             SW AUGUSTA              40.23N 90.95W
06/10/2011  M1.75 INCH       HANCOCK            IL   TRAINED SPOTTER

0645 PM     HAIL             AUGUSTA                 40.23N 90.95W
06/10/2011  E2.75 INCH       HANCOCK            IL   FIRE DEPT/RESCUE

            GOLF BALL TO BASEBALL SIZED HAIL. REPORT FROM AUGUSTA
            FIRE DEPARTMENT RELAYED BY HANCOCK COUNTY SHERIFFS
            OFFICE.

0645 PM     TSTM WND GST     SW AUGUSTA              40.23N 90.95W
06/10/2011  E55.00 MPH       HANCOCK            IL   TRAINED SPOTTER

0645 PM     TSTM WND DMG     AUGUSTA                 40.23N 90.95W
06/10/2011                   HANCOCK            IL   FIRE DEPT/RESCUE

            LARGE TREE DOWN. REPORT FROM AUGUSTA FIRE DEPARTMENT
            RELAYED BY HANCOCK COUNTY SHERIFFS OFFICE.

0650 PM     TSTM WND DMG     BOWEN                   40.23N 91.06W
06/10/2011                   HANCOCK            IL   TRAINED SPOTTER

            POWER LINES DOWN EAST OF BOWEN. POWER OUTAGE IN BOWEN.

&&

GROSS

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