Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 61, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1997, 7:16 PM CDT for Clay County, O'Brien County, Iowa. It was in force for 49 min. 2 reports 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, 7:16 PM CDT (00:16 UTC)
- Expired
- Jul 7, 1997, 8:05 PM CDT
- In force
- 49 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Clay County, IA, O'Brien County, IA
The radar
The Sioux Falls radar (KFSD), 122 km from the middle of the area, began a volume at 00:16 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, 7:22 PM CDT | Hail 1 | Sutherland, IA | |
| Jul 7, 7:44 PM CDT | Hail 1 | Royal, 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, 0.3 hours before the alert went out and 212 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.
649 WUUS1 KFSD 080017 RRA SVRFSD IAC041-141-080105- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 716 PM CDT MON JUL 7 1997 * SEVERE THUNDERSTORM WARNING FOR WESTERN CLAY COUNTY - IN NORTHWESTERN IOWA EASTERN OBRIEN COUNTY - IN NORTHWESTERN IOWA * UNTIL 805 PM CDT * SOME AREAS AFFECTED ROYAL AROUND 720 PM CDT ROSSIE AROUND 735 PM CDT GREENVILLE AROUND 745 PM CDT * AT 715 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH A POTENTIAL FOR LARGE HAIL 31 MILES SOUTHEAST OF SIBLEY OR 7 MILES WEST OF ROYAL MOVING EAST AT 25 MPH. A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. CHAPMAN
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 7, 10:30 AM CDT, 8 hours 46 minutes earlier.
Area forecast discussion, Jul 7, 10:30 AM CDT, 8 hours 46 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 1025 AM CDT MON JUL 7 1997 NOW STATEMENT HAS BEEN ISSUED TO BRING CURRENT CONVECTION SITUATION UPTO DATE OVER CWA. THIS AFTERNOON... WILL GUESS AT REDEVELOPMENT WITH MENTION OF SEVERE... AT EDGE OF DOME OF RAIN COOLED AIR... OR FSD TO SUX AND THEN MOVING EAST. NO ZONE UPDATE AND WILL USE NOW STATEMENT TO MAKE THESE CHANGES ALONG WITH SLIGHT |TEMPS AND WINDS MODIFICATION. .FSD...NONE MILLSAPPS
In the hours before
Local storm report, Jul 7, 6:04 PM CDT, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
604 PM CDT MON JUL 7 1997
U
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
/....COUNTY LOCATION....
U
0430 PM SIOUX FALLS SD 1.00 INCH HAIL
07/07/97 MINNEHAHA SOUTHWEST SIOUX FALLS
U
0442 PM SIOUX FALLS SD 0.75 INCH HAIL
07/07/97 LINCOLN SOUTHERN SIOUX FALLS
U
0453 PM 1 E CANTON SD TORNADO
07/07/97 LINCOLN REPORTED BY LOCAL SPOTTER
U
0500 PM HARRISBURG SD TORNADO
07/07/97 LINCOLN REPORTED JUST SOUTH OF
HARRISBURG BY SPOTTER
U
0517 PM 5 W HUDSON SD TORNADO
07/07/97 LINCOLN REPORTED BY SPOTTER
U
0455 PM INWOOD IA TORNADO
07/07/97 LYON REPORTED BY SHERIFF OFFICE
U
0525 PM INWOOD IA TORNADO
07/07/97 LYON REPORTED BY SHERIFF
ULocal storm report, Jul 7, 6:04 PM CDT, 1 hour 12 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, 1 hour 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 SHERIFFSpecial weather statement, Jul 7, 6:41 PM CDT, 35 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, 33 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
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 |
| Jul 7, 8:15 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida | 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.