Severe Thunderstorm Warning 129, NWS Quad Cities, IA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
410 AM CDT SAT MAY 27 2006

.DISCUSSION...
LINEAR MCS MOVING THROUGH WESTERN IA EARLY THIS MORNING WITH
ISOLATED WAA WING CONVECTION AHEAD OF THE MCS FROM CENTRAL INTO
ECNTRL IOWA.  MCS WAS RIDING WEAK THETA E GRADIENT AND GRADIENT OF
BETTER MID LEVEL LAPSE RATES.  WNW-ESE ORIENTED MID LEVEL
THICKNESSES AND 3HR PRESSURE FALL AXIS EXTENDING ESE  OF THE LINE
APEX ALL SUGGEST FOCUS OF CONVECTION WILL MOVE OVER THE SRN HALF OF
THE CWA AFTER 11Z PROVIDED IT CAN HOLD TOGETHER. KEPT POPS IN THE
SOUTH IN THE HIGH CHANCE CATEGORY THIS MORNING WITH MCS MOVING INTO
THE MID LEVEL RIDGE AND DRIER AIRMASS.  THE CONVECTION IS STARTING
TO SHOW SOME SIGNS OF WEAKENING WITH THE NUMBER OF LIGHTNING STRIKES
DECREASING DURING THE PAST HOUR.  ALSO EXTENDED SLGT CHANCE POPS
FURTHER NORTH INTO THE NRN CWA TO COVER THE WAA WING CONVECTION.
IF THE CONVECTION DOES MAKE IT THIS FAR EAST THIS MORNING...IT
SHOULD DIE OUT BY LATE MORNING WITH H8 WINDS PROGGED TO REFOCUS
BACK TO THE WEST  IN RESPONSE TO H5 TROF DIGGING OVER THE WESTERN
U.S.  THE MORNING CONVECTION WILL HAVE AN IMPACT ON AFTERNOON TEMPS
AND LOCATION OF CONVECTIVE DEVELOPMENT THIS AFTERNOON.  EXPECT
DEBRIS CLOUDS TO KEEP TEMPS FROM REACHING THEIR POTENTIAL...
ESPECIALLY IN THE SOUTH WHICH SHOULD ALSO KEEP LOW LEVELS CAPPED.
WITH UNCERTAINTY ABOUT THE AMOUNT OF CLOUDS AND WARMING...KEPT LOW
CHANCE POPS IN FOR THIS AFTERNOON/EVE  SINCE MODELS WERE SHOWING
POTENTIAL FOR SOME WEAK FORCING AS S/W ENERGY LIFTS OUT OF THE TX.
DEEP SWLY FLOW SETS UP OVER THE MID MS VALLEY FOR SUNDAY/MONDAY WITH
LITTLE POTENTIAL FOR ANY PCPN.  EXPECT PLENTY OF SUNSHINE FOR SUNDAY
AND GUST SOUTH WINDS.  WITH PLENTY OF HEATING EXPECTED AND GOOD
MIXING INCREASED MAX TS FOR SUNDAY INTO THE LOW TO MID 90S...WHICH
IS NEAR OR AT RECORD HIGHS FOR MAY 28TH.  SFC PRES GRADIENT WEAKENS
SOME BY MONDAY AHEAD OF THE SLOW MOVING COLD FRONT. THIS COMBINED
WITH INCREASING MID/HIGH CLOUDS SHOULD KEEP TEMPS LOWER THAN THOSE
EXPECTED SUNDAY.  LEANED TOWARD THE SLOW GFS SOLUTION FOR FROPA  ON
TUESDAY WITH TROF STILL DIGGING IN THE WEST.  NO CHANGES WERE MADE
TO THE REMAINDER OF THE FCST WITH UPPER FLOW BECOMING NWLY BY MID
WEEK...ENDING THE EARLY SEASON HEAT.

&&

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

&&

DLF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1233 PM CDT SAT MAY 27 2006

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-281000-
BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO-
CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL-
HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA-
JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA-
MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL-
SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL-
WASHINGTON IA-WHITESIDE IL-
1233 PM CDT SAT MAY 27 2006

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...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON AND
EARLY EVENING OVER THE OUTLOOK AREA. THE LATEST OBSERVATIONAL
DATA SHOWS A CAP...OR LID OF WARM AIR...IN PLACE...WHICH IS
INHIBITING DEVELOPMENT AT THIS TIME. HOWEVER...TEMPERATURES CONTINUE
TO CLIMB AND ARE EXPECTED TO BE IN THE RANGE OF 91 TO 95 DEGREES
OVER MUCH OF SOUTHEAST IOWA...EAST CENTRAL IOWA AND WEST CENTRAL
ILLINOIS BY MID AFTERNOON. CURRENT INDICATIONS SUGGEST THESE HOT
TEMPERATURES WILL BE SUFFICIENT TO ERODE OR WEAKEN THE CAP
ALLOWING FOR THUNDERSTORMS TO DEVELOP...BETWEEN 1 PM AND 4 PM...AND
CONTINUING THROUGH 10 PM. THE POTENTIAL EXISTS FOR A FEW OF THE
STORMS TO BECOME SEVERE...WITH THE MAIN THREAT BEING LARGE HAIL UP
TO QUARTER SIZE AND DAMAGING WINDS OF 60 TO 80 MPH. THE AREA MOST AT
RISK IS EAST OF A LINE FROM DUBUQUE...TO IOWA CITY...TO FAIRFIELD.
THE STORMS WILL ALSO BRING VERY HEAVY RAIN AND THE POTENTIAL
FOR LOCALIZED FLOODING.

THE STORM PREDICTION CENTER HAS OUTLOOKED THE ENTIRE AREA IN A SLIGHT
RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY
EARLY SUMMER HEAT WILL SPREAD OVER THE AREA SUNDAY AS TEMPERATURES
CLIMB INTO THE LOWER 90S.  THE HOT TEMPERATURES COMBINED WITH
DEWPOINTS IN THE MID 60S WITH CREATE HEAT INDICES WELL INTO THE
90S.

THUNDERSTORMS ARE EXPECTED AGAIN TUESDAY EVENING AHEAD OF A COLD
FRONT MOVING THROUGH THE REGION.  THESE THUNDERSTORMS WILL HAVE THE
POTENTIAL TO BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND
EVENING...ESPECIALLY OVER EASTERN AND SOUTHERN PORTIONS OF THE
OUTLOOK AREA.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
216 PM CDT SAT MAY 27 2006

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

0210 PM     HAIL             2 W LE CLAIRE           41.60N 90.40W
05/27/2006  M1.00 INCH       SCOTT              IA   NWS EMPLOYEE

            INTERSECTION OF I-80 AND RIVER DRIVE IN LE CLAIRE.
            REPORTED BY FORMER NWS EMPLOYEE.

&&

ELLIOTT

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
218 PM CDT SAT MAY 27 2006

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

0209 PM     HAIL             LE CLAIRE               41.60N 90.36W
05/27/2006  M0.88 INCH       SCOTT              IA   TRAINED SPOTTER

            INTERSECTION OF 14TH AND WISCONSIN IN LE CLAIRE.

&&

ELLIOTT

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