Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 51, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 1, 1997, 8:28 PM CDT for O'Brien County, Sioux County, Iowa. It was in force for 47 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 1, 1997, 8:28 PM CDT (01:28 UTC)
- Expired
- Jul 1, 1997, 9:15 PM CDT
- In force
- 47 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties O'Brien County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 87 km from the middle of the area, began a volume at 01:31 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
Omaha, NE (KOAX), launched 00:00Z, 1.5 hours before the alert went out and 200 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
- 3588 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- -0.5
- Supercell composite
- -3.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 020128 RRA SVRFSD IAC141-167-020215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 828 PM CDT TUE JUL 1 1997 * SEVERE THUNDERSTORM WARNING FOR WESTERN O'BRIEN COUNTY - IN NORTHWESTERN IOWA EASTERN SIOUX COUNTY - IN NORTHWESTERN IOWA * UNTIL 915 PM CDT * SOME AREAS AFFECTED NEWKIRK AROUND 830 PM CDT GRANVILLE AROUND 830 PM CDT HOSPERS AROUND 835 PM CDT PHILBY AROUND 840 PM CDT GERMANTOWN AROUND 840 PM CDT PAULLINA AROUND 855 PM CDT PRIMGHAR AROUND 855 PM CDT GAZA AROUND 855 PM CDT CALUMET AROUND 900 PM CDT SUTHERLAND AROUND 905 PM CDT * AT 823 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 33 MILES SOUTHWEST OF SIBLEY OR 3 MILES SOUTHWEST OF ORANGE CITY MOVING EAST AT 40 MPH. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH... DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. BLOOM
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 1, 10:20 AM CDT, 10 hours 8 minutes earlier.
Area forecast discussion, Jul 1, 10:20 AM CDT, 10 hours 8 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 1017 AM CDT TUE JUL 1 1997 MORNING ANALYSIS SHOWS DRY PUNCH AT 700 INTO WESTERN NEBRASKA AND SOUTHERN SOUTH DAKOTA. POOL OF 15C PLUS DEW POINTS OVER WESTERN NE AND SD. 200 JET FROM THE SW... OVER THE STATE NOW WITH THE LEADING WEAKER STREAK... BUT WITH A 115 KT JET UPSTREAM OVER SW U.S. RAIN COOLED AIR CENTERED ON LINE FROM E NE THRU PICKSTOWN TO NEAR PIR... WHICH ALONG WITH CIRRUS SHELD SHOULD ADVECT EAST. BEST CHC FOR AFTERNOON DEVELOPMENT IN SW/SC ...CURRENTLY CLEAR AIR... JUST EAST OF CURRENT CONVECTION AND AT TIP OF SFC DEWPOINT PROD. CURRENT ZONE PACKAGE IS REASONABLE... AND NOW STATEMENT WILL TO BE USED TO RELAY THE ABOVE SVR WX THREAT SCENARIO. TEMPS AND WIND CURRENTLY IN LINE WITH REALITY. .FSD...NONE MILLSAPPS
In the hours before
Special weather statement, Jul 1, 3:45 PM CDT, 4 hours 43 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 345 PM CDT TUE JUL 1 1997 SDZ037-038-051>053-057>061-020200- AURORA-BEADLE-BRULE-BUFFALO-DAVISON-HAND-HANSON-JERAULD-MCCOOK-SANBORN- INCLUDING THE CITIES OF...HURON...CHAMBERLAIN...MITCHELL 345 PM CDT TUE JUL 1 1997 ...TORNADO WATCH FOR PORTIONS OF SOUTHEAST SOUTH DAKOTA CANCELLED... THE TORNADO WATCH THAT WAS IN EFFECT FOR PORTIONS OF SOUTHEAST SOUTH DAKOTA UNTIL 700 PM HAS BEEN CANCELLED. AT 345 PM SIOUX FALLS DOPPLER RADAR SHOWED THAT THE STRONG THUNDERSTORMS HAD MOVED OUT OF THE AREA. IN ADDITION DRIER AIR WAS MOVING INTO THE REGION PROMPTING THE CANCELLATION OF THIS PARTOF THE WATCH. THE REMAINDER OF THE TORNADO WATCH FOR NORTHEAST AND EAST CENTRAL SOUTH DAKOTA WILL CONTINUE UNTIL 700 PM. HOLMES
Special weather statement, Jul 1, 3:48 PM CDT, 4 hours 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 345 PM CDT TUE JUL 1 1997 SDZ037-038-051>053-057>061-020200- AURORA-BEADLE-BRULE-BUFFALO-DAVISON-HAND-HANSON-JERAULD-MCCOOK-SANBORN- INCLUDING THE CITIES OF...HURON...CHAMBERLAIN...MITCHELL 345 PM CDT TUE JUL 1 1997 ...TORNADO WATCH FOR PORTIONS OF SOUTHEAST SOUTH DAKOTA CANCELLED... THE TORNADO WATCH THAT WAS IN EFFECT FOR PORTIONS OF SOUTHEAST SOUTH DAKOTA UNTIL 700 PM HAS BEEN CANCELLED. AT 345 PM SIOUX FALLS DOPPLER RADAR SHOWED THAT THE STRONG THUNDERSTORMS HAD MOVED OUT OF THE AREA. IN ADDITION DRIER AIR WAS MOVING INTO THE REGION PROMPTING THE CANCELLATION OF THIS PARTOF THE WATCH. THE REMAINDER OF THE TORNADO WATCH FOR NORTHEAST AND EAST CENTRAL SOUTH DAKOTA WILL CONTINUE UNTIL 700 PM. HOLMES
Special weather statement, Jul 1, 5:59 PM CDT, 2 hours 29 minutes before
SDZ039-040-054>056-061-062-020005- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 559 PM CDT TUE JUL 1 1997 ...TORNADO WATCH NUMBER 547 CANCELED FOR SOUTHEAST SOUTH DAKOTA... THE TORNADO WATCH HAS BEEN CANCELED AS OF 6 PM CDT FOR THE SOUTHEAST SOUTH DAKOTA COUNTIES OF KINGSBURY...BROOKINGS...MINER...LAKE... MOODY...MCCOOK AND MINNEHAHA. SCATTERED THUNDERSTORMS ARE STILL POSSIBLE IN THESE COUNTIES THIS EVENING... BUT SEVERE WEATHER IS NOT EXPECTED. UMLAND
Special weather statement, Jul 1, 6:00 PM CDT, 2 hours 28 minutes before
SDZ039-040-054>056-061-062-020005- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 559 PM CDT TUE JUL 1 1997 ...TORNADO WATCH NUMBER 547 CANCELED FOR SOUTHEAST SOUTH DAKOTA... THE TORNADO WATCH HAS BEEN CANCELED AS OF 6 PM CDT FOR THE SOUTHEAST SOUTH DAKOTA COUNTIES OF KINGSBURY...BROOKINGS...MINER...LAKE... MOODY...MCCOOK AND MINNEHAHA. SCATTERED THUNDERSTORMS ARE STILL POSSIBLE IN THESE COUNTIES THIS EVENING... BUT SEVERE WEATHER IS NOT EXPECTED. UMLAND
Local storm report, Jul 1, 8:00 PM CDT, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
800 PM CDT TUE JUL 1 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0215 PM IROQUOIS SD 0.75 INCH HAIL
07/01/97 KINGSBURY
MJFLocal storm report, Jul 1, 8:01 PM CDT, 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
800 PM CDT TUE JUL 1 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0215 PM IROQUOIS SD 0.75 INCH HAIL
07/01/97 KINGSBURY
MJFNearby
Severe Thunderstorm Warnings in Iowa, 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.