Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 60, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1997, 6:47 PM CDT for Plymouth County, Iowa. It was in force for 33 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, 6:47 PM CDT (23:47 UTC)
- Expired
- Jul 7, 1997, 7:20 PM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Plymouth County, IA
The radar
The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 23:46 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, 7:19 PM CDT | Tornado F0 | Kingsley, IA | A tornado resulted in no reported damage. |
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 12:00Z, 11.8 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 929 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 072348 SVRFSD IAC149-080020- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 647 PM CDT MON JUL 7 1997 * SEVERE THUNDERSTORM WARNING FOR EASTERN PLYMOUTH COUNTY - IN NORTHWESTERN IOWA * UNTIL 720 PM CDT * SOME AREAS AFFECTED OLEARY AROUND 650 PM CDT REMSEN AROUND 655 PM CDT * AT 644 PM CDT...NATIONAL WEATHER SERVICE SPOTTERS REPORTED A SEVERE THUNDERSTORM 25 MILES NORTHEAST OF SIOUX CITY OR 4 MILES SOUTHWEST OF REMSEN MOVING EAST AT 30 MPH. AT 640 PM A TORNADO WAS REPORTED 3 MILES EAST AND 1 MILE SOUTH OF LE MARS. A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. DO NOT USE YOUR CAR TO OUTRUN A TORNADO. CARS ARE EASILY TOSSED AROUND BY TORNADIC WINDS. IF YOU ARE CAUGHT IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO STRUCTURE IS NEARBY...SEEK @SHELTER IN A DITCH OR LOW SPOT. 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 7, 10:30 AM CDT, 8 hours 17 minutes earlier.
Area forecast discussion, Jul 7, 10:30 AM CDT, 8 hours 17 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, 43 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, 43 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, 42 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, 6 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, 4 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, 5:01 PM CDT | Tornado Warning | FSD | Lyon, Sioux | 44 min |
| Jul 7, 5:40 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 30 min |
| Jul 7, 6:15 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 30 min |
| Jul 7, 6:47 PM CDT | Tornado Warning | FSD | Plymouth | 33 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.