127  
FGUS73 KLSX 052050  
ESFLSX  
ILC001-005-009-013-027-051-061-083-117-119-121-133-135-149-157-  
163-189-MOC007-019-027-051-055-071-073-093-099-103-111-113-123-  
127-135-137-139-151-163-173-179-183-186-187-189-205-219-221-510-  
072100-  
 
HYDROLOGIC OUTLOOK  
NATIONAL WEATHER SERVICE SAINT LOUIS MO  
350 PM CDT WED SEP 5 2018  
 
...HEAVY RAINFALL AND FLOODING THREAT LATE THIS WEEK AND INTO THE  
WEEKEND...  
 
THE COMBINATION OF A SLOW MOVING AND STALLING COLD FRONT ALONG  
WITH THE TROPICAL DEPRESSION GORDON ARE EXPECTED TO BRING  
WIDESPREAD RAINFALL TO CENTRAL AND EASTERN MISSOURI AS WELL AS  
WEST CENTRAL AND SOUTHWEST ILLINOIS THURSDAY MORNING THROUGH THIS  
WEEKEND. HEAVY RAINFALL IS POSSIBLE, PARTICULARLY ACROSS NORTHEAST  
MISSOURI AND WEST CENTRAL ILLINOIS.  
 
PRESENT INDICATIONS SUGGEST THE HIGHEST RAINFALL RATES AND  
GREATEST RAINFALL AMOUNTS WILL OCCUR SATURDAY AND SATURDAY NIGHT AS  
TROPICAL DEPRESSION GORDON PASSES THROUGH THE REGION AND INTERACTS  
WITH THE STALLED FRONT. AREAS ALONG AND JUST NORTH OF I-70 APPEAR  
TO BE UNDER THE GREATEST THREAT FOR HEAVY RAINFALL AND FLOODING AT  
THIS TIME GIVEN THE CURRENT PROJECTED TRACK OF GORDON. 4 TO 6  
INCHES OF RAINFALL IS FORECAST FROM TODAY THROUGH SUNDAY IN THESE  
AREAS. A FLASH FLOOD THREAT COULD MATERIALIZE IF PERSISTENT HIGH  
RAINFALL RATES DEVELOP OVER ANY ONE LOCATION.  
 
ADDITIONALLY, MINOR RIVER FLOODING IS ALREADY FORECAST TO BEGIN  
LATER THIS WEEK ON THE MISSISSIPPI RIVER NORTH OF ST. LOUIS AS A  
RESULT OF HEAVY RAIN THAT HAS FALLEN ACROSS THE UPPER MISSISSIPPI  
RIVER BASIN DURING THE LAST 7 TO 10 DAYS. THE ADDITIONAL RAINFALL  
EXPECTED FROM TODAY THROUGH THIS WEEKEND COULD RESULT IN MODERATE  
OR EVEN MAJOR FLOOD LEVELS AND ADDITIONAL DOWNSTREAM FLOODING. IT  
COULD ALSO RESULT IN FLOODING ON OTHER TRIBUTARIES OF THE  
MISSISSIPPI RIVER INCLUDING THE SALT, FABIUS, AND CUIVRE RIVERS.  
 
MINOR TO MODERATE FLOODING IS ALSO LIKELY ALONG THE MISSOURI  
RIVER. FORTUNATELY, THERE IS NOT AS MUCH WATER UPSTREAM IN THE  
MISSOURI RIVER BASIN, SO THE FLOODING THREAT IS LESS ON THE  
MISSOURI THAN ON THE MISSISSIPPI.  
 
PLEASE NOTE THAT THE FORECAST INFORMATION PROVIDED IN THIS  
OUTLOOK IS HIGHLY DEPENDENT ON THE TRACK OF TROPICAL DEPRESSION  
GORDON. CONFIDENCE IN THAT FORECAST HAS INCREASED, BUT SOME  
UNCERTAINTY REMAINS AND THE GREATEST THREAT AREA COULD END UP  
SHIFTING NORTH OR SOUTH DEPENDING ON THE EVENTUAL TRACK AND SPEED  
OF THE SYSTEM.  
 
PEOPLE IN CENTRAL AND EASTERN MISSOURI AND WESTERN ILLINOIS  
SHOULD STAY ABREAST OF THE LATEST FORECASTS AND BE PREPARED FOR  
HEAVY RAINFALL AND FLOODING THURSDAY INTO THE WEEKEND.  
 

 
 
BSH  
 
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