Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 73, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 13, 1997, 5:04 PM CDT for Rock County, Minnesota. It was in force for 31 min. 3 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 13, 1997, 5:04 PM CDT (22:04 UTC)
- Expired
- Jul 13, 1997, 5:35 PM CDT
- In force
- 31 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Rock County, MN
The radar
The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 22:05 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 13, 5:10 PM CDT | Hail 0.75 | Jasper, MN | |
| Jul 13, 5:15 PM CDT | Hail 1.75 | Hardwick, MN | |
| Jul 13, 5:25 PM CDT | Hail 0.75 | Hardwick, MN |
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 13, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 10.1 hours before the alert went out and 219 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
- 825 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1060 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 132206 RRA SVRFSD MNC133-132235- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 504 PM CDT SUN JUL 13 1997 * SEVERE THUNDERSTORM WARNING FOR NORTHERN ROCK COUNTY IN SOUTHWESTERN MINNESOTA * UNTIL 535 PM CDT * SOME AREAS AFFECTED HARDWICK AROUND 515 PM CDT KENNETH AROUND 525 PM CDT * AT 502 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 18 MILES SOUTH OF PIPESTONE OR 9 MILES WEST OF HARDWICK MOVING EAST AT 35 MPH. AT SIGNS OF AN IMPENDING STORM...TOWERING THUNDERHEADS...DARKENING SKIES...LIGHTNING AND INCREASING WINDS...MOVE TO A PLACE OF SAFETY. TUNE TO NOAA WEATHER RADIO OR YOUR LOCAL MEDIA OUTLET FOR THE LATEST WEATHER INFORMATION. HARMON
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 13, 9:57 AM CDT, 7 hours 7 minutes earlier.
Area forecast discussion, Jul 13, 9:57 AM CDT, 7 hours 7 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 955 AM CDT SUN JUL 13 1997 SOME ISOLATED SHOWERS REMAINED BETWEEN THE MISSOURI AND JAMES RIVERS OF SD AT 1445Z WILE THE THUNDERSTORMS HAD MOVED BEYOND OUR CWA IN NORTHWEST IA AND SOUTHWEST MN. UPPER LOW IS FORECAST TO TRACK EAST ALONG THE ND/SD BORDER THIS AFTERNOON AND EVENING. THIS SHOULD KEEP THE BEST CONVERGENCE AND LIFT TO THE NORTH OF OUR CWA. BUT COOLING ALOFT AND H5 AND DIURNAL HEATING IS EXPECTED TO CREATE SCATTERED THUNDERSTORMS ACROSS THE CWA AS IN EARLIER FORECAST. WILL UPDATE THE ZONES TO CHANGE SOME WORDING AND TO SLOW DOWN THE FORECAST WIND SHIFT. .FSD...NONE UML(AND
In the hours before
Special weather statement, Jul 13, 11:05 AM CDT, 5 hours 59 minutes before
SIGNIFICANT WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1105 AM CDT SUN JUL 13 1997 *** SIGNIFICANT WEATHER PERTAINS TO WEATHER ELEMENTS ASSOCIATED WITH THUNDERSTORMS. *** .SYNOPSIS...AN UPPER LEVEL LOW WILL MOVE EAST ALONG THE NORTH DAKOTA AND SOUTH DAKOTA BORDER THIS AFTERNOON AND EVENING. A SURFACE TROUGH AND WIND SHIFT IN THE WESTERN PART OF SOUTH DAKOTA WILL MOVE INTO SOUTHWEST MINNESOTA AND NORTHWEST IOWA THIS EVENING. WHILE THE MAIN FOCUS FOR SEVERE THUNDERSTORMS WILL BE TO THE NORTH OF OUR AREA OF CONCERN...SEVERE WEATHER IS STILL A POSSIBILITY AS THUNDERSTORMS DEVELOP EARLY THIS AFTERNOON WEST OF THE MISSOURI RIVER IN CENTRAL SOUTH DAKOTA AND SPREAD EAST ACROSS THE REGION LATER THIS AFTERNOON AND CONTINUE INTO THE EVENING IN SOUTHWEST MINNESOTA AND NORTHWEST IOWA. SDZ050-052-057-058-063-140500- AURORA-BRULE-CHARLES MIX-GREGORY-JERAULD- INCLUDING THE CITIES OF...CHAMBERLAIN 1105 AM CDT SUN JUL 13 1997 FORECAST THROUGH MIDNIGHT: SCATTERED THUNDERSTORMS MAY DEVELOP AFTER 2 PM WITH THE POSSIBLITY OF SOME LARGE HAIL. THE TUNDERSTORMS THREAT SHOULD HAVE MOVED EAST OF THE AREA BY THIS EVENING. * SIGNIFICANT WEATHER: LARGE HAIL (EQUAL TO OR GREATER THAN 0.75 DIAMETER) * SPOTTER ACTIVATION: SPOTTER ACTIVATION MAY BE NEEDED AFTER 2 PM CDT. SDZ038>040-053>056-059>062-064>071-NEZ013-140500- BEADLE-BON HOMME-BROOKINGS-CLAY-DAVISON-DOUGLAS-HANSON-HUTCHINSON- KINGSBURY-LAKE-LINCOLN-MC COOK-MINER-MINNEHAHA-MOODY-SANBORN-TURNER- UNION-YANKTON-DIXON- INCLUDING THE CITIES OF...BROOKINGS...HURON...MITCHELL...SIOUX FALLS... YANKTON 1105 AM CDT SUN JUL 13 1997 FORECAST THROUGH MIDNIGHT: SCATTERED THUNDERSTORMS MAY DEVELOP AFTER 3 PM WITH THE POSSIBLITY OF LOCALLY LARGE HAIL AND DAMAGING WIND GUSTS. * SIGNIFICANT WEATHER: SEVERE WINDS (GUSTS EQUAL TO OR GREATER THAN 58 MPH) LARGE HAIL (EQUAL TO OR GREATER THAN 0.75 DIAMETER) * SPOTTER ACTIVATION: SPOTTER ACTIVATION MAY BE NEEDED AFTER 3 PM CDT. MNZ071-072-080-081-089-090-097-098-IAZ001>003-012>014-020>022-031-032- NEZ014-140500- COTTONWOOD-JACKSON-LINCOLN-LYON-MURRAY-NOBLES-PIPESTONE-ROCK- BUENA VISTA-CHEROKEE-CLAY-DICKINSON-IDA-LYON-OBRIEN-OSCEOLA-PLYMOUTH- SIOUX-WOODBURY-DAKOTA- INCLUDING THE CITIES OF...LUVERNE...PIPESTONE...SLAYTON...WORTHINGTON... LE MARS...ROCK RAPIDS...SIOUX CENTER...SIOUX CITY...SPENCER... SPIRIT LAKE...STORM LAKE 1105 AM CDT SUN JUL 13 1997 FORECAST THROUGH MIDNIGHT: SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP FOR LATE AFTERNOON AND INTO THE EVENING WITH THE POSSIBLITY OF LARGE HAIL AND DAMAGING WIND GUSTS. * SIGNIFICANT WEATHER: SEVERE WINDS (GUSTS EQUAL TO OR GREATER THAN 58 MPH) LARGE HAIL (EQUAL TO OR GREATER THAN 0.75 DIAMETER) * SPOTTER ACTIVATION: SPOTTER ACTIVATION MAY BE NEEDED AFTER 4 PM CDT. UMLAND
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 4:36 PM CDT | Severe Thunderstorm Warning | FSD | Pipestone | 34 min |
| Jul 13, 6:29 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson | 31 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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.