

000 

WGUS53 KFSD 160641

FFWFSD

SDC135-160800-



BULLETIN - EAS ACTIVATION REQUESTED

FLASH FLOOD WARNING

NATIONAL WEATHER SERVICE SIOUX FALLS SD

137 AM CDT SAT SEP 16 2006



THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A



* FLASH FLOOD WARNING FOR...

  YANKTON COUNTY IN SOUTHEAST SOUTH DAKOTA



* UNTIL 300 AM CDT



* AT 135 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED

  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.



* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 

  MAYFIELD...YANKTON AND LESTERVILLE. 



THE PRIMARY CONCERN INTO THE PREDAWN HOURS IS EXCESSIVE RUNOFF FROM 

HEAVY RAINFALL...WHICH WILL CAUSE FLOODING OF SMALL CREEKS AND 

STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL 

AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.



IT APPEARS THAT THE HEAVIEST RAINFALL IS BEGINNING TO FINALLY LIFT

NORTHWARD ACROSS YANKTON COUNTY...WITH NO IMMEDIATE REDEVELOPMENT

IN NORTHEAST NEBRASKA. HOWEVER...THE SITUATION WILL BE MONITORED

CLOSELY EARLY THIS MORNING IN CASE MORE STORMS DO DEVELOP IN 

NORTHEAST NEBRASKA...THEN LIFT NORTH TO NORTHEAST. IF THAT HAPPENS...

THEN THE FLASH FLOOD WARNING WILL LIKELY NEED EXTENDED AT THAT TIME. 



BUT FOR NOW...BE ALERT THAT RUNOFF WILL LAST FROM THIS CURRENT

ROUND OF STORMS THROUGH AROUND 3 AM.



BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE

DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE

UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS

SUBJECT TO FLOODING WHEN WATER BEGINS RISING.



LAT...LON 4287 9761 4286 9718 4315 9718 4317 9764



$$



MJF



000 

WGUS53 KFSD 160641

FFWFSD

SDC135-160800-



BULLETIN - EAS ACTIVATION REQUESTED

FLASH FLOOD WARNING

NATIONAL WEATHER SERVICE SIOUX FALLS SD

137 AM CDT SAT SEP 16 2006



THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A



* FLASH FLOOD WARNING FOR...

  YANKTON COUNTY IN SOUTHEAST SOUTH DAKOTA



* UNTIL 300 AM CDT



* AT 135 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED

  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.



* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 

  MAYFIELD...YANKTON AND LESTERVILLE. 



THE PRIMARY CONCERN INTO THE PREDAWN HOURS IS EXCESSIVE RUNOFF FROM 

HEAVY RAINFALL...WHICH WILL CAUSE FLOODING OF SMALL CREEKS AND 

STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL 

AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.



IT APPEARS THAT THE HEAVIEST RAINFALL IS BEGINNING TO FINALLY LIFT

NORTHWARD ACROSS YANKTON COUNTY...WITH NO IMMEDIATE REDEVELOPMENT

IN NORTHEAST NEBRASKA. HOWEVER...THE SITUATION WILL BE MONITORED

CLOSELY EARLY THIS MORNING IN CASE MORE STORMS DO DEVELOP IN 

NORTHEAST NEBRASKA...THEN LIFT NORTH TO NORTHEAST. IF THAT HAPPENS...

THEN THE FLASH FLOOD WARNING WILL LIKELY NEED EXTENDED AT THAT TIME. 



BUT FOR NOW...BE ALERT THAT RUNOFF WILL LAST FROM THIS CURRENT

ROUND OF STORMS THROUGH AROUND 3 AM.



BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE

DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE

UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS

SUBJECT TO FLOODING WHEN WATER BEGINS RISING.



LAT...LON 4287 9761 4286 9718 4315 9718 4317 9764



$$



MJF

