Flash Flood Warning 1, NWS Sioux Falls, SD

SDZ018-020-010530-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1035 PM CDT FRI MAY 31 1991

AT 1030 PM CDT RADAR INDICATED INTENSE THUNDERSTORMS OVER EXTREME
SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWA AND NORTHEAST NEBRASKA. OVER
SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA THESE THUNDERSTORMS WERE IN A
AREA FROM JUST EAST AKRON IOWA...25 MILES NORTH OF SIOUX CITY IOWA...TO
10 MILES SOUTH OF IRETON IOWA...30 MILES NORTHEAST OF SIOUX CITY. THESE
THUNDERSTORMS WERE MOVING NORTHEAST AT 15 MPH. THESE STORMS WILL BE
MOVING THROUGH SIOUX COUNTY IOWA BY 1230 AM CDT WITH VERY HEAVY RAIN...
POSSIBLE STRONG GUSTY WINDS AND SMALL HAIL. CITIES MOST LIKELY EFFECTED
WOULD BE IRETON...ALTON...SIOUX CENTER AND HULL.

INTENSE THUNDERSTORMS WERE ALSO LOCATED OVER NORTHEAST NEBRASKA..10
MILES SOUTH OF YANTON SOUTH DDAKOTA. THESE STORMS WERE MOVING
EASTNORTHEAST AT 15 MPH. THESE STORMS MAY ALSO PRODUCE VERY HEAVY
RAIN...STRONG GUSTY WINDS AND SMALL HAIL AS THEY MOVE THROUGH SOUTHEAST
YANKTON..AND CLAY COUNTIES OF SOUTH DAKOTA BY 1230 AM CDT. CITIES MOST
LIKELY EFFECTED WOULD BE YANKTON...VOLIN...MECKLING AND VERMILLION.

NO SEVERE WEATHER HAS BEEN REPORTED WITH ANY OF THESE STROMS AT THIS
TIME. HOWEVER PEOPLE THROUGH SOUTHEAST SOUTY DAKOTA..NORTHWEST IOWA AND
SOUTHWEST MINNESOTA ARE ADVISED TO BE ALERT TONIGHT.
BEHREND

IAZ001-004-005-010500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1120 PM CDT FRI MAY 31 1991

...SEVERE THUNDRSTORM WATCH IN EFFECT TIL 3 AM FOR DIXON, DAKOTA
AND THURSTON COUNTIES...
...FLASH FLOOD WATCH FOR SIOUXLAND TONIGHT...

AT 11 PM A LINE OF SHOWERS AND THUNDERSTORMS WERE LOCATED FROM
34 MILES NORTHEAST OF SIOUX CITY TO 10 MILES NORTH OF NORFOLK
NEBRASKA. THIS LINE OF STORMS WAS MOVING NORTHEAST AT 10 MPH.
THIS LILNE CONTAINED AREAS OF HEAVY RAIN AND IS MOST LIKELY CAUSING
SOME LOWLAND FLOODING. THERE IS ALSO A TREAT OF SOME STRONG GUSTY
WINDS AND SMALL HAIL IN THIS LINES OF STORMS.

PERSONS LIVING IN LOW LYING AREAS SHOULD STAY ALERT AND WATCH FOR
RISING WKATERS. BE PREPARED TO MOVE TO HIGHER GROUND.

TANNER

IAZ001-004-005-010600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1227 AM CDT SAT JUN 01 1991

...SEVERE THUNDRSTORM WATCH IN EFFECT TIL 3 AM FOR DIXON, DAKOTA
AND THURSTON COUNTIES...
...FLASH FLOOD WATCH FOR SIOUXLAND TONIGHT...

AT 1210 AM A LINE OF SHOWERS AND THUNDERSTORMS WERE LOCATED FROM
40 MILES NORTHEAST OF SIOUX CITY NEAR ORANGE CITY TO 40 MILES
WEST OF SIOUX CITY. THIS LINE OF STORMS WAS NEAR STATIONARY.
THIS LINE CONTAINED AREAS OF HEAVY RAIN AND IS MOST LIKELY CAUSING
SOME URBAN AND LOWLAND FLOODING IN THE COUNTIES OF PLYMOUTH IN IOWA
AND IN UNION IN SOUTH DAKOTA.

THIS LINE OF STORMS MAY ALSO CONTAIN SMALL HAIL AND GUSTY WINDS
AT TIMES.  AT 1210 AM MAuRBLE SIZE HAIL HAD BEEN REPORTED AT ELKPOINT
SOUTH DAKOTA.
PERSONS LIVING IN LOW LYING AREAS SHOULD BE STAY ALERT AND WATCH
FOR RISING WATER.  YOU SHOULD BE PREPARED TO MOVE TO HIGHER GROUND
FAST.

TANNER

SDZ018-020-010630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1245 AM CDT SAT JUN 1 1991

THUNDERSTORMS OVER EXTREME SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWA AND
NORTHEAST NEBRASKA CONTINUED AT 1230 PM. THE STRONGEST THUNDERSTORMS
WERE NEAR VERMILLION SOUTH DAKOTA AND 5 MILES NORTH OF MERRILL IOWA OR
25 MILES NORTH OF SIOUX CITY. THE THUNDERSTORMS SHOWED LITTLE MOVEMENT
AND ARE EXPECTED TO MOVE LITTLE OVER THE NEXT FEW HOURS.

THESE THUNDERSTORMS HAVE A HISTORY OF VERY HEAVY RAIN...FREQUENT
LIGHTNING STRIKES AND SMALL HAIL. DUE TO THE LIMITED MOVEMENT OF THESE
THUNDERSTORMS...SOME AREAS WILL RECEIVE VERY HEAVY RAINFALL AMOUNTS
RESULTING IN STREET FLOODING AND POOLING O6F WATER IN LOW LYING AREAS.

PEOPLE RESIDING IN THESE AREAS SHOULD REMAIN ALERT TO THE POSSIBILITY
OF SEVERE WEATHER OR FLOODING OF LOW LYING AREAS.

EDDY

IAZ001-004-005-010700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
0115 AM CDT SAT JUN 01 1991

...SEVERE THUNDRSTORM WATCH IN EFFECT TIL 3 AM FOR DIXON, DAKOTA
AND THURSTON COUNTIES...
...FLASH FLOOD WATCH FOR SIOUXLAND TONIGHT...

AT 1 AM A LARGE AREA OF SHOWERS AND THUNDERSTORMS WAS NORTHWEST OF
A LINE FROM 40 MILES NORTHEAST OF SIOUX CITY NEAR ORANGE CITY TO
COLUMBUS NEBRASKA. THIS AREA OF STORMS WAS NEAR STATIONARY AND
PRODUCING VERY HEAVY RAIN SMALL HAIL AND DANGEROUS LIGHTNING. THERE
HAVE BEEN REPORTS OF PEA TO MARBLE SIZE HAIL JUST NORTH OF PONCA
NEBRASKA...20 MILES WEST OF SIOUX CITY AND JUST NORTH OF SIOUX CITY.

WITH THE SLOW MOVEMENT OF THESE STORMS PERSONS IN THE COUNTIES OF
UNION IN SOUTH DAKOTA NEAR THE CITIES OF ELK POINT AND JEFFERSON...
DIXON COUNTY IN NEBRASKA NEAR THE CITIES OF NEWCASTLE AND PONCA...
AND PLYMOUTH COUNTY IN IOWA NEAR THE CITIES OF MERRILL AND LEMARS
CAN EXPECT LOWLAND FLOODING AND SOME STREET OR URBAN FLOODING.

PERSONS IN THESE COUNTIES SHOULD BE ALERT AND WATCH FOR RAPID
RISES IN WATER LEVELS AND BE PREPARED TO MOVE TO HIGHER GROUND.

TANNER

SDZ017-018-010830-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
220 AM CDT SAT JUN 1 1991

THUNDERSTORMS HAD CONTINUED TO SPREAD OVER A LARGER AREA OF SOUTHEAST
SOUTH DAKOTA SINCE 2 AM CDT. INTENSE THUNDERSTORMS WERE AROUND 50 MPH
WEST AND NORTHWEST OF SIOUX FALLS IN HANSON COUNTY AND ALSO ABOUT 25
MILES WEST OF SIOUX FALLS IN MCCOOK COUNTY. LOCALLY HEAVY RAIN...SMALL
HAIL...AND WIND GUSTS OF 40 TO 50 MPH WILL OCCUR WITH THESE STORMS AS
THE MOVE SLOWLY EAST AT AROUND 10 MPH.

THE INTENSE THUNDERSTORMS WILL CONTINUE THROUGH 330 AM CDT IN HANSON
AND MCCOOK COUNTIES AND MAY MOVE OR DEVELOP INTO MINNEHAHA COUNTY.
PEOPLE DRIVING ALONG INTERSTATE 90 WEST OF SIOUX FALLS TO MITCHELL
SHOULD BE ESPECIALLY CAUTIONS AS THE LOCALLY HEAVY RAIN WILL REDUCE
VISIBILITY TO NEAR ZERO AND WATER ON THE ROAD SURFACE WILL REQUIRE
REDUCED SPEEDS TO PROCEDE SAFELY.

LOCAL PONDING OF WATER WILL OCCUR AND URBAN FLOODING IS POSSIBLE IN
AL/EXANDRIA...SALEM...AND BRIDGEWATER.

UMLAND