Alert archive / Iowa / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 45, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 1, 1991, 1:45 AM CDT for Woodbury County, Iowa; Dakota County, Nebraska. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Jun 1, 1991, 1:45 AM CDT (06:45 UTC)
- Expired
- Jun 1, 1991, 2:45 AM CDT
- In force
- 60 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Woodbury County, IA, Dakota County, NE
The nearest sounding before it
Omaha, NE (KOVN), launched 00:00Z, 6.8 hours before the alert went out and 119 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 4117 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1094 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 31, 10:38 PM CDT, 3 hours 7 minutes before
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</html>Special weather statement, May 31, 10:45 PM CDT, 3 hours before
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
Special weather statement, May 31, 11:21 PM CDT, 2 hours 24 minutes before
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
Special weather statement, Jun 1, 12:27 AM CDT, 1 hour 18 minutes before
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
Special weather statement, Jun 1, 12:48 AM CDT, 57 minutes before
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
Special weather statement, Jun 1, 1:16 AM CDT, 29 minutes before
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
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 2:33 AM CDT | Flash Flood Warning | FSD | Plymouth | 4 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 1991Severe Thunderstorm Warnings in Nebraska, 1991Every severe thunderstorm warning in 1991
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.