Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 64, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1997, 8:15 PM CDT for Cherokee County, Ida County, Iowa. It was in force for 30 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 7, 1997, 8:15 PM CDT (01:15 UTC)
- Expired
- Jul 7, 1997, 8:45 PM CDT
- In force
- 30 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Cherokee County, IA, Ida County, IA
The radar
The Sioux Falls radar (KFSD), 148 km from the middle of the area, began a volume at 01:17 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 7, 8:30 PM CDT | Hail 0.75 | Holstein, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 7, 4:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 1.3 hours before the alert went out and 153 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
- 1901 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1492 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 154 m²/s²
- 0-3 km storm-relative helicity
- 328 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 13.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 080116 RRA
SVRFSD
IAC035-093-080150-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
815 PM CDT MON JUL 7 1997
* SEVERE THUNDERSTORM WARNING FOR
SOUTHEASTERN CHEROKEE COUNTY - IN NORTHWESTERN IOWA
NORTHEASTERN IDA COUNTY - IN NORTHWESTERN IOWA
* UNTIL 845 PM CDT
* SOME AREAS AFFECTED
DIAMOND CENTER AROUND 825 PM CDT
GALVA AROUND 835 PM CDT
* AT 813 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM 46 MILES EAST OF SIOUX CITY OR 7 MILES EAST
OF QUIMBY MOVING EAST AT 30 MPH.
A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN AND
OCCASIONALLY DO PRODUCE TORNADOES.
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.
CHAPMANWhat 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 7, 8:02 PM CDT, 13 minutes earlier.
Area forecast discussion, Jul 7, 8:02 PM CDT, 13 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 801 PM CDT MON JUL 7 1997 WITH SVR WX IN AREA NOT MUCH TIME TO DISCUSS THE WX. SQUALL LINE CONTf TO MOVE SE AND MAINLY IN JUST SE SECTIONS OF THE CWA. VERY LITTLE NEW DEVELOPMENT HAS BEEN PRESENT BEHIND LN. WL TRY TO GET ANOTHER LOCAL STORM REPORT OUT FOR MEDIA USE BY 10 PM. .FSD...NONE B RUBY
In the hours before
Local storm report, Jul 7, 6:04 PM CDT, 2 hours 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
604 PM CDT MON JUL 7 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0430 PM SIOUX FALLS SD 1.00 INCH HAIL
07/07/97 MINNEHAHA SOUTHWEST SIOUX FALLS
0442 PM SIOUX FALLS SD 0.75 INCH HAIL
07/07/97 LINCOLN SOUTHERN SIOUX FALLS
0453 PM 1 E CANTON SD TORNADO
07/07/97 LINCOLN REPORTED BY LOCAL SPOTTER
0500 PM HARRISBURG SD TORNADO
07/07/97 LINCOLN REPORTED JUST SOUTH OF
HARRISBURG BY SPOTTER
0517 PM 5 W HUDSON SD TORNADO
07/07/97 LINCOLN REPORTED BY SPOTTER
0455 PM INWOOD IA TORNADO
07/07/97 LYON REPORTED BY SHERIFF OFFICE
0525 PM INWOOD IA TORNADO
07/07/97 LYON REPORTED BY SHERIFFLocal storm report, Jul 7, 6:05 PM CDT, 2 hours 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
604 PM CDT MON JUL 7 1997
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0430 PM SIOUX FALLS SD 1.00 INCH HAIL
07/07/97 MINNEHAHA SOUTHWEST SIOUX FALLS
0442 PM SIOUX FALLS SD 0.75 INCH HAIL
07/07/97 LINCOLN SOUTHERN SIOUX FALLS
0453 PM 1 E CANTON SD TORNADO
07/07/97 LINCOLN REPORTED BY LOCAL SPOTTER
0500 PM HARRISBURG SD TORNADO
07/07/97 LINCOLN REPORTED JUST SOUTH OF
HARRISBURG BY SPOTTER
0517 PM 5 W HUDSON SD TORNADO
07/07/97 LINCOLN REPORTED BY SPOTTER
0455 PM INWOOD IA TORNADO
07/07/97 LYON REPORTED BY SHERIFF OFFICE
0525 PM INWOOD IA TORNADO
07/07/97 LYON REPORTED BY SHERIFFSpecial weather statement, Jul 7, 6:41 PM CDT, 1 hour 34 minutes before
SDZ038>040-050-052>070-080045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 641 PM CDT MON JUL 7 1997 ...TORNADO WATCH HAS BEEN CANCELLED FOR SOUTHEAST SOUTH DAKOTA EXCEPT UNION COUNTY... THE LINE OF SEVERE THUNDERSTORMS HAS MOVED OUT OF ALL BUT EXTREME SOUTHEAST SOUTH DAKOTA. THE TORNADO WATCH FOR MOST OF SOUTHEAST SOUTH DAKOTA HAS BEEN CANCELLED. UNION COUNTY IN FAR SOUTHEAST SOUTH DAKOTA ALONG WITH SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND EXTREME NORTHEAST NEBRASKA WILL REMAIN IN THE TORNADO WATCH UNTIL 10 PM CDT. RUBY
Special weather statement, Jul 7, 6:43 PM CDT, 1 hour 32 minutes before
SDZ038>040-050-052>070-080045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 641 PM CDT MON JUL 7 1997 ...TORNADO WATCH HAS BEEN CANCELLED FOR SOUTHEAST SOUTH DAKOTA EXCEPT UNION COUNTY... THE LINE OF SEVERE THUNDERSTORMS HAS MOVED OUT OF ALL BUT EXTREME SOUTHEAST SOUTH DAKOTA. THE TORNADO WATCH FOR MOST OF SOUTHEAST SOUTH DAKOTA HAS BEEN CANCELLED. UNION COUNTY IN FAR SOUTHEAST SOUTH DAKOTA ALONG WITH SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND EXTREME NORTHEAST NEBRASKA WILL REMAIN IN THE TORNADO WATCH UNTIL 10 PM CDT. RUBY
Special weather statement, Jul 7, 7:22 PM CDT, 53 minutes before
MNZ071-072-080-081-089-090-097-098-080125- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 722 PM CDT MON JUL 7 1997 ...TORNADO WATCH CANCELLED FOR SOUTHWEST MINNESOTA... THE TORNADO WATCH FOR SOUTHWEST MINNESOTA HAS BEEN CANCELLED. A LINE OF STRONG TO SEVERE THUNDERSTORMS HAS MOVED OUT OF SOUTHWEST MINNESOTA. ISOLATED THUNDERSTORMS WILL STILL BE POSSIBLE DURING THE EVENING HOURS BUT ARE NOT EXPECTED TO BE SEVERE. A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM FOR NORTHWEST IOWA...EXTREME NORTHEAST NEBRASKA...AND UNION COUNTY IN SOUTH DAKOTA.
Special weather statement, Jul 7, 7:26 PM CDT, 49 minutes before
MNZ071-072-080-081-089-090-097-098-080125- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 722 PM CDT MON JUL 7 1997 ...TORNADO WATCH CANCELLED FOR SOUTHWEST MINNESOTA... THE TORNADO WATCH FOR SOUTHWEST MINNESOTA HAS BEEN CANCELLED. A LINE OF STRONG TO SEVERE THUNDERSTORMS HAS MOVED OUT OF SOUTHWEST MINNESOTA. ISOLATED THUNDERSTORMS WILL STILL BE POSSIBLE DURING THE EVENING HOURS BUT ARE NOT EXPECTED TO BE SEVERE. A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM FOR NORTHWEST IOWA...EXTREME NORTHEAST NEBRASKA...AND UNION COUNTY IN SOUTH DAKOTA.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:16 PM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 49 min |
| Jul 7, 7:46 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 34 min |
| Jul 7, 8:05 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 30 min |
Nearby
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.