Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 77, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 20, 1997, 3:26 AM CDT for Beadle County, South Dakota. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1997, 3:26 AM CDT (08:26 UTC)
- Expired
- Jul 20, 1997, 4:00 AM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Beadle County, SD
The radar
The Aberdeen radar (KABR), 116 km from the middle of the area, began a volume at 08:26 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 8.4 hours before the alert went out and 55 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
- 2323 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1325 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 200826 RRA SVRFSD SDC005-200900- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 326 AM CDT SUN JUL 20 1997 * SEVERE THUNDERSTORM WARNING FOR EASTERN BEADLE COUNTY IN EASTCENTRAL SOUTH DAKOTA * UNTIL 400 AM CDT * SOME AREAS AFFECTED HURON AROUND 330 AM CDT CAVOUR AROUND 345 AM CDT * AT 323 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN THE VICINITY OF HURON MOVING NORTHEAST AT 15 MPH. WILLIAMS
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.
NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 9:07 PM CDT, 6 hours 19 minutes earlier.
Area forecast discussion, Jul 19, 9:07 PM CDT, 6 hours 19 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 900 PM CDT SAT JUL 19 1997 NOT MUCH TIME FOR DISCUSSION. SLOW MOVING TSTSM DVLPD ALONG SFC BNDRY JUST S OF FSD ALONG AND EAST TO WEST LINE IN FAR NWRN IA. UPDATED ZONES FOR EXPIRATION OF BEADLE COUNTY WATCH AND NEW WATCH FOR SRN CWA UNTIL 1 AM CDT. 88-D SHOWS THUNDERSTORMS TO BE VERTICALLY STACKED WITH LITTLE WIND SHEAR SO BELIEVE MAIN THREAT TO BE FLASH FLOODING WITH LOCAL AMOUNTS OF THREE INCHES PLUS OUT OF SOME OF THESE CELLS. WILL ISSUE A FLASH FLOOD WATCH FOR NORTHERN THREE TIERS OF COUNTIES IN NW IA WHEN TIME ALLOWS. .FSD...SEVERE THUNDERSTORM WATCH UNTIL 1 AM FOR SOUTHEAST SOUTH DAKOTA... FAR SOUTHWEST MINNESOTA...NORTHWEST IOWA AND FAR NORTHEAST NEBRASKA. FUHS
In the hours before
Special weather statement, Jul 19, 10:33 PM CDT, 4 hours 53 minutes before
NEZ013-014-SDZ060>062-065>071-200435- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1033 PM CDT SAT JUL 19 1997 THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR SOUTHEAST SOUTH DAKOTA AND EXTREME NORTHEAST NEBRASKA. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR SOUTHWEST MINNESOTA AND NORTHWEST IOWA UNTIL 100 AM CDT. AT 1030 PM SIOUX FALLS DOPPLER RADAR SHOWED THUNDERSTORMS WITH HEAVY RAIN IN AN EAST TO WEST LINE ACROSS SOUTHERN SOUTH DAKOTA INTO NORTHWEST IOWA. THESE STORMS WERE NEARLY STATIONARY AND DRFITING SLOWLY TO THE EAST. SEVERE WEATHER IS NOT ANTICIPATED WITH THESE STORMS BUT HEAVY RAINFALL IS LIKELY. RAINFALL RATES MAY APPROACH ONE TO TWO INCHES PER HOUR IN A FEW LOCALLIZED AREAS WITH SOME OF THESE STORMS. PAY ATTENTIONA AT NIGHT WHEN IT IS HARDER TO SEE FLOODED ROADWAYS. STAY TUNDE TO NOAA WEATHER RADIO AND THE LOCAL MEDI FOR FURTHER UPDATES. HOLMES
Special weather statement, Jul 19, 10:34 PM CDT, 4 hours 52 minutes before
NEZ013-014-SDZ060>062-065>071-200435- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1033 PM CDT SAT JUL 19 1997 THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR SOUTHEAST SOUTH DAKOTA AND EXTREME NORTHEAST NEBRASKA. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR SOUTHWEST MINNESOTA AND NORTHWEST IOWA UNTIL 100 AM CDT. AT 1030 PM SIOUX FALLS DOPPLER RADAR SHOWED THUNDERSTORMS WITH HEAVY RAIN IN AN EAST TO WEST LINE ACROSS SOUTHERN SOUTH DAKOTA INTO NORTHWEST IOWA. THESE STORMS WERE NEARLY STATIONARY AND DRFITING SLOWLY TO THE EAST. SEVERE WEATHER IS NOT ANTICIPATED WITH THESE STORMS BUT HEAVY RAINFALL IS LIKELY. RAINFALL RATES MAY APPROACH ONE TO TWO INCHE6S PER HOUR IN A FEW LOCALLIZED AREAS WITH SOME OF THESE STORMS. PAY ATTENTIONA AT NIGHT WHEN IT IS HARDER TO SEE FLOODED ROADWAYS. STAY TUNDE TO NOAA WEATHER RADIO AND THE LOCAL MEDI FOR FURTHER UPDATES. HOLMES
Special weather statement, Jul 20, 12:58 AM CDT, 2 hours 28 minutes before
IAZ001>003-012>014-020>022-031-032-MNZ089-090-098-200650- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1258 AM CDT SUN JUL 20 1997 THE SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHWEST MINNESOTA AND NORTHWEST IOWA HAS EXPIRED. CONDITIONS FAVORABLE FOR SEVERE THUNDERSTORMS HAVE WEAKENED. AT 1245 AM SIOUX FALLS DOPPLER RADAR CONTINUED TO SHOW THUNDERSTORMS DEVELOPING OVER NORTHWEST IOWA AND FAR SOUTHWEST MINNESOTA BUT THEY WERE NOT PRODUCING SEVERE WEATHER. HOWEVER VERY HEAVY RAIN WAS FALLING WITH THESE STORMS AND RADAR ESTIMATES OF RAINFALL HAVE BEEN IN THE ONE TO TWO INCH PER HOUR RANGE. IF YOU ARE TRAVELING ACROSS NORTHWEST IOWA AND SOUTHWEST MINNESOTA TONIGHT BE ON THE LOOK OUT FOR FLOODED ROADWAYS. DO NOT CROSS FLOODED ROADS. HOLMES
Nearby
Severe Thunderstorm Warnings in South Dakota, 1997Every severe thunderstorm warning in 1997
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; radar from the NEXRAD Level II archive.