Alert archive / Iowa / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 49, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 14, 1991, 7:52 PM CDT for Plymouth County, Iowa. It was in force for 38 min.
The area
The counties it named.
The facts
- Issued
- Jun 14, 1991, 7:52 PM CDT (00:52 UTC)
- Expired
- Jun 14, 1991, 8:30 PM CDT
- In force
- 38 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Plymouth County, IA
The nearest sounding before it
Omaha, NE (KOVN), launched 00:00Z, 0.9 hours before the alert went out and 158 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
- 3690 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1731 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSUX 150052
SVRSUX
IAC149-150145-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
752 PM CDT FRI JUN 14 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE NORTHWEST PART OF IOWA
EASTERN PLYMOUTH
AT 745 PM RADAR INDICATED A SEVERE THUNDERSTORM IN PLYMOUTH
COUNTY IOWA...20 MILES NORTHEAST OF SIOUX CITY...NEAR MERRILL.
THE THUNDERSTORM WAS MOVING NORTHEAST AT 20 MILES AN HOUR AND
SHOULD TRACK JUST SOUTH OF MERRILL AND REMSEN BY 9 PM.
REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN
QUICKLY FLOOD LOW LYING AREAS. IF YOU ARE IN THE PATH OF THIS STORM
TAKE SHELTER IN A REINFORCED BUILDING IMMEDIATELY.
ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORTS
OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.
QUINNWhat 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, Jun 14, 5:03 PM CDT, 2 hours 49 minutes before
IAZ001-004-005-142300- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR SIOUX CITY AND VICINITY NATIONAL WEATHER SERVICE SIOUX CITY IA 501 PM CDT FRI JUN 14 1991 ...A SEVERE THUNDERSTORM WATCH FOR THE SIOUXLAND AREA UNTIL 10 PM... AT 5 PM THUNDERSTORMS BETWEEN EMERSON AND WATERBURY NEBRASKA...15 MILES SOUTHWEST OF SIOUX CITY...EXTENDED BEYOND NORFOLK. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. PEOPLE THROUGHOUT NORTHEAST NEBRASKA...NORTHWEST IOWA AND ADJACENT PARTS OF SOUTHEAST SOUTH DAKOTA SHOULD BE ALERT FOR POSSSIBLE SEVERE WEATHER THIS EVENING. PEOPLE IN FLOOD PRONE AREAS SHOULD BE READY TO MOVE TO HIGH GROUND. THE RAIN WILL BE FALLING ON SATURATED GROUND SO RAPID RUNOFF WILL QUICKLY FLOOD LOW LYING AREAS. PLAN NOW FOR YOUR SAFETY. J. QUINN
Special weather statement, Jun 14, 6:26 PM CDT, 1 hour 26 minutes before
SDZ012-142230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 625 PM CDT FRI JUN 14 1991 AT 618 PM CDT RADAR INDICATED A STRONG THUNDERSTORM 15 MILES NORTHNORTHWEST OF BROOKINGS JUST NORTH OF BRUCE SOUTH DAKOTA. THE THUNDERSTORM WAS MOVING VERY SLOWLY NORTH AT 5 MPH. THIS THUNDERSTORM WILL PRODUCE DANGEROUS CLOUD TO GROUND LIGHTNING... PERIODS OF VERY HEAVY RAIN REDUCING VISIBILITY... AND HAIL. DUE TO THE VERY SLOW MOVEMENT...SOME URBAN AND SMALL STREAM FLOODING MAY OCCUR. PERSONS IN THE PATH OF THIS THUNDERSTORM SHOULD BE PREPARED FOR ANY ADVERSE WEATHER THIS THUNDERSTORM MAY PRODUCE. MOVE TO A SAFE REINFORCED SHELTER IF NECESSARY. KEEP UP WITH THE LATEST WEATHER INFORMATION. BLOOM
Special weather statement, Jun 14, 6:50 PM CDT, 1 hour 2 minutes before
SDZ017>020-150200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 650 PM CDT FRI JUN 14 1991 THE SEVERE THUNDERSTORM WATCH...WHICH INCLUDED PARTS OF SOUTHEAST SOUTH DAKOTA AND THE NORTHWEST CORNER OF IOWA HAS BEEN CANCELLED AND HAS BEEN REPLACED WITH A WATCH FURTHER SOUTH AND EAST. AT 637 PM CDT RADAR INDICATED AN AREA OF STRONG THUNERSTORMS REMAINING OVER NORTHEAST NEBRASKA. THESE THUNDERSTORMS HAVE TURNED TOWARD THE NORTH AT 10 MPH. THESE THUNDERSTORMS WILL MOVE INTO THE YANKTON AND VERMILLION AREAS...60 MILES SOUTHWEST OF SIOUX FALLS...BETWEEN 7PM AND 9PM CDT. THESE THUNDERSTORMS WILL PRODUCE DANGEROUS CLOUD TO GROUND LIGHTNING AND PERIODS OF VERY HEAVY RAIN REDUCING VISIBILITY. SMALL HAIL AND GUSTY WINDS ARE ALSO POSSIBLE WITH THESE THUNDERSTORMS. DUE TO THE SLOW MOVEMENT...SOME URBAN AND SMALL STREAM FLOODING MAY OCCUR. PERSONS IN THE PATH OF THIS THUNDERSTORM SHOULD BE PREPARED FOR ANY ADVERSE WEATHER THIS THUNDERSTORM MAY PRODUCE. MOVE TO A SAFE REINFORCED SHELTER IF NECESSARY. KEEP UP WITH THE LATEST WEATHER INFORMATION. BLOOM
Special weather statement, Jun 14, 7:02 PM CDT, 50 minutes before
IAZ001-004-005-150100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 701 PM CDT FRI JUN 14 1991 ...A SEVERE THUNDERSTORM WATCH FOR THE SIOUXLAND AREA UNTIL MIDNIGHT... AT 7 PM A STRONG THUNDERSTORM WAS OVER DAKOTA CITY NEBRASKA MOVING NORTH EAST AT 20 MILES AN HOUR. FREQUENT DEADLY LIGHTNING WAS OCCURRING WITH THIS STORM. VERY HEAVY RAIN ALONG WITH HAIL AND GUSTY WINDS ARE POSSIBLE. PEOPLE IN OR NEAR SIOUX CITY TAKE COVER IFR SEVERE WEATHER APPROACHES. PEOPLE IN FLOOD PRONE AREAS PREPARE TO MOVE TO HIGHER GROUND. J. QUINN
Special weather statement, Jun 14, 7:23 PM CDT, 29 minutes before
IAZ001-004-005-150115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 722 PM CDT FRI JUN 14 1991 ...A SEVERE THUNDERSTORM WATCH FOR THE SIOUXLAND AREA UNTIL MIDNIGHT... AT 720 PM A
Special weather statement, Jun 14, 7:47 PM CDT, 5 minutes before
SDZ012-150200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 745 PM CDT FRI JUN 14 1991 AT 740 PM CDT RADAR INDICATED A STRONG THUNDERSTORM WITH VERY HEAVY 20 MILES WEST NORTHWEST OF BROOKINGS NEAR ARLINGTON SOUTH DAKOTA. THE THUNDERSTORM WAS MOVING TO THE EAST NORTHEAST AT 5 MPH. STRONG GUSTY WINDS AND HAIL WILL BE POSSIBLE OVER NORTHWEST BROOKING COUNTY INCLUDING THE OAKWOOD LAKES AREA THROUGH 845 PM. SMALL STREAM AND URBAN FLOODING WILL ALSO BE POSSIBLE WITH THIS STORM THROUGH 930 PM. PERSONS IN NORTHWEST BROOKINGS COUNTY SHOULD REMAIN ALERT TO THE POSSIBILITY OF SEVERE WEATHER FROM THIS STORM. 1 INCH HAIL WAS REPORTED AROUND 730 PM WITH THIS STORM OVER NORTHEAST KnINGSBURY COUNTY. BIER
Nearby
Severe Thunderstorm Warnings in Iowa, 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.