STORM SUMMARY NUMBER 1 FOR CENTRAL U.S. HEAVY RAIN EVENT
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1100 AM EDT SAT APR 23 2011
 
...PERIODS OF HEAVY RAINFALL SETTING UP OVER THE MIDDLE
MISSISSIPPI RIVER VALLEY INTO THE OHIO VALLEY THIS WEEKEND AND
INTO EARLY NEXT WEEK...
 
FLOOD AND FLASH FLOOD WATCHES ARE CURRENTLY IN EFFECT FROM
SOUTHERN MISSOURI...AND EXTENDING EASTWARD THROUGH MUCH OF THE
OHIO VALLEY AND INTO SOUTHWESTERN PENNSYLVANIA.  FLASH FLOOD
WARNINGS ARE ALSO IN EFFECTS FOR LOCALIZED AREAS WITHIN THIS SAME
REGION.
 
FOR A DETAILED GRAPHICAL DEPICTION OF THE LATEST
WATCHES...WARNINGS AND ADVISORIES...PLEASE SEE WWW.WEATHER.GOV

AT 1000 AM EDT...A 998 MB...29.47 INCH...LOW PRESSURE CENTER WAS
LOCATED OVER NORTHERN LAKE HURON...WITH A TRAILING COLD FRONT
EXTENDING INTO THE OHIO VALLEY AND THROUGH OKLAHOMA...WHERE IT
CONNECTS TO A 1002 MB...29.59 INCH SURFACE LOW OVER NORTH CENTRAL
TEXAS.  NATIONAL WEATHER SERVICE RADARS SHOW MODERATE TO LOCALLY
HEAVY RAIN OVER SOUTHERN MISSOURI AND NORTHWESTERN ARKANSAS...AND
PATCHY AREAS OF RAIN WITH EMBEDDED THUNDERSTORMS EXTENDING
EASTWARD ALONG THE OHIO RIVER AND INTO WEST VIRGINIA.  THIS
ACTIVITY WAS MOVING SLIGHTLY NORTH OF DUE EAST.

...SELECTED STORM TOTAL RAINFALL IN INCHES FROM 700 AM EDT FRI APR
22 THROUGH 1000 AM EDT SAT APR 23...

...ARKANSAS...
BENTONVILLE                           1.10                     
FAYETTEVILLE/SPRINGDALE               0.64                     

...ILLINOIS...
CARBONDALE/MURPHYSBORO                1.54                     
LAWRENCEVILLE-VINCENNES INTL          1.39                     
QUINCY MUNI ARPT                      1.39                     
DECATUR ARPT                          1.16                     
SPRINGFIELD/CAPITAL ARPT              1.13                     
MOUNT_CARMEL                          1.01                     
SCOTT AFB/BELLEVILLE                  0.95                     
ALTON/ST LOUIS RGNL ARPT              0.91                     
MOUNT VERNON/OUTLAND AIRPORT          0.83                     
CARMI MUNI ARPT                       0.81                     
CAHOKIA/ST LOUIS                      0.66                     

...INDIANA...
BLOOMINGTON/MONROE CO. ARPT           1.87                     
EVANSVILLE RGNL ARPT                  1.63                     
SHELBYVILLE MUNI ARPT                 0.51                     

...KENTUCKY...
LAWRENCEBURG                          2.66                     
HENDERSON CITY                        2.62                     
LOUISVILLE/STANDIFORD                 1.84                     
FRANKFORT/CAPITAL CITY ARPT           1.61                     
OWENSBORO/DAVIESS CO. APT             1.50                     
LEXINGTON/BLUE GRASS FIELD            1.39                     
FORT KNOX AAF                         1.25                     
PADUCAH/BARKLEY                       0.83                     

...MISSOURI...
ELLSINORE                             3.49                     
WEST PLAINS MUNI ARPT                 1.65                     
ST LOUIS/LAMBERT INTL ARPT            1.20                     
CAPE GIRARDEAU MUNI ARPT              0.94                     
ST CHARLES                            0.84                     
COLUMBIA RGNL ARPT                    0.63                     
SPRINGFIELD MUNI ARPT                 0.61                     
SPIRIT OF ST LOUIS APT                0.60                     
JOPLIN RGNL ARPT                      0.54                     
POPLAR BLUFF MUNI ARPT                0.53                     

...OHIO...
CINCINNATI/LUNKIN FIELD               0.91                     
HAMILTON ARPT                         0.70                     
DAYTON GENERAL AIRPORT                0.56                     

...OKLAHOMA...
MCALESTER REGIONAL ARPT               0.52                     


A FRONTAL BOUNDARY SITUATED OVER THE OHIO VALLEY AND INTO MISSOURI
WILL BECOME QUASI-STATIONARY OVER THE NEXT SEVERAL DAYS AS A FEW
LOW PRESSURE SYSTEMS TRANSVERSE THE REGION.  WARM AND HUMID AIR
FROM THE GULF OF MEXICO WILL BE SURGING NORTHWARD...AND COLDER
CANADIAN AIR WILL BE MOVING SOUTHWARD...FOCUSING SIGNIFICANT
MOISTURE CONVERGENCE ALONG THE BOUNDARY.  THIS IS EXPECTED TO
RESULT IN PERIODS OF MODERATE TO HEAVY RAIN...ALONG WITH
THUNDERSTORMS...WITH RAINFALL AMOUNTS ON THE ORDER OF 4 TO 8
INCHES...WITH LOCALLY HIGHER AMOUNTS POSSIBLE BY WEDNESDAY
MORNING.  GIVEN THE ANTECEDENT SATURATED GROUNDS AND HIGH RIVER
LEVELS...EXPECT FLOODING ISSUES TO MATERIALIZE.

THE NEXT STORM SUMMARY WILL BE ISSUED BY THE HYDROMETEOROLOGICAL
PREDICTION CENTER AT 500 PM EDT. PLEASE REFER TO YOUR LOCAL
NATIONAL WEATHER SERVICE OFFICE FOR ADDITIONAL INFORMATION ON THIS
EVENT.

HAMRICK