Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 58, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1997, 5:48 PM CDT for Nobles County, Minnesota. It was in force for 32 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, 5:48 PM CDT (22:48 UTC)
- Expired
- Jul 7, 1997, 6:20 PM CDT
- In force
- 32 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 79 km from the middle of the area, began a volume at 22:51 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, 6:10 PM CDT | Hail 0.88 | Reading, 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 7, 4:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 216 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
- 1452 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
141 WUUS1 KFSD 072249 RRA SVRFSD MNC105-072320- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 548 PM CDT MON JUL 7 1997 * SEVERE THUNDERSTORM WARNING FOR NOBLES COUNTY - IN SOUTHWESTERN MINNESOTA * UNTIL 620 PM CDT * SOME AREAS AFFECTED READING AROUND 550 PM CDT WORTHINGTON AROUND 600 PM CDT KINBRAE AROUND 610 PM CDT BREWSTER AROUND 610 PM CDT * AT 546 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 14 MILES NORTHWEST OF WORTHINGTON OR 6 MILES NORTHWEST OF READING MOVING EAST AT 35 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. 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, 7 hours 18 minutes earlier.
Area forecast discussion, Jul 7, 10:30 AM CDT, 7 hours 18 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
Special weather statement, Jul 7, 11:53 AM CDT, 5 hours 55 minutes before
SIGNIFICANT WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1153 AM CDT MON JUL 7 1997 *** SIGNIFICANT WEATHER PERTAINS TO WEATHER ELEMENTS ASSOCIATED WITH THUNDERSTORMS. *** .SYNOPSIS...A TROUGH OF LOW PRESSURE EXTENDS OUT OF CANADA ACROSS THE DAKOTAS. THIS TROUGH WILL MOVE ACROSS THE EASTERN DAKOTAS THIS AFTERNOON AND INTO MINNESOTA AND NORTHWEST IOWA THIS EVENING. SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP NEAR AND AHEAD OF THIS TROUGH... WITH THE CHANCES FOR SEVERE WEATHER INCREASING TO THE SOUTHEAST TOWARD NORTHWEST IOWA. SDZ068>071-IAZ003-012>014-020>022-031-032-NEZ013-014-080500- BON HOMME-CLAY-UNION-YANKTON-BUENA VISTA-CHEROKEE-CLAY-DICKINSON-IDA- OBRIEN-PLYMOUTH-SIOUX-WOODBURY-DAKOTA-DIXON- INCLUDING THE CITIES OF...YANKTON...LE MARS...SIOUX CENTER... SIOUX CITY...SPENCER...SPIRIT LAKE...STORM LAKE 1153 AM CDT MON JUL 7 1997 FORECAST THROUGH MIDNIGHT: WARM MOIST AIR WILL SWING ACROSS SOUTH CENTRAL AND SOUTHEAST SOUTH DAKOTA TODAY AHEAD OF A TROUGH OF LOW PRESSURE. SCATTERED THUNDERSTORMS ARE EXPECTED IN THIS AREA... WITH HEAVIER STORMS POSSIBLE OVER THE TRI STATE AREA NEAR A BOUNDARY OF RAIN COOLED AIR AT THE SURFACE LEFT OVER FROM THIS MORNINGS RAINS. * SIGNIFICANT WEATHER: SEVERE WINDS (GUSTS EQUAL TO OR GREATER THAN 58 MPH) LARGE HAIL (EQUAL TO OR GREATER THAN 0.75 DIAMETER) HEAVY RAIN * SPOTTER ACTIVATION: SPOTTER ACTIVATION MAY BE NEEDED AFTER 5PM. SDZ038>040-050-052>067-MNZ071-072-080-081-089-090-097-098-IAZ001-002-080500- AURORA-BEADLE-BROOKINGS-BRULE-CHARLES MIX-DAVISON-DOUGLAS-GREGORY- HANSON-HUTCHINSON-JERAULD-KINGSBURY-LAKE-LINCOLN-MC COOK-MINER- MINNEHAHA-MOODY-SANBORN-TURNER-COTTONWOOD-JACKSON-LINCOLN-LYON-MURRAY- NOBLES-PIPESTONE-ROCK-LYON-OSCEOLA- INCLUDING THE CITIES OF...BROOKINGS...CHAMBERLAIN...HURON...MITCHELL... SIOUX FALLS...LUVERNE...PIPESTONE...SLAYTON...WORTHINGTON... ROCK RAPIDS 1153 AM CDT MON JUL 7 1997 FORECAST THROUGH MIDNIGHT: WARM MOIST AIR AT LOWER LEVELS WILL SWING ACROSS SOUTH CENTRAL AND SOUTHEAST SOUTH DAKOTA THIS AFTERNOON. THUNDERSTORMS ARE EXPECTED TO DEVELOPE IN THIS AREA. * SIGNIFICANT WEATHER: STRONG WINDS (GUSTS LESS THAN 58 MPH) SMALL HAIL (LESS THAN 0.75 DIAMETER) * SPOTTER ACTIVATION: SPOTTER ACTIVATION MAY BE NEEDED AFTER 3PM. MILLSAPPS
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 5:34 PM CDT | Severe Thunderstorm Warning | FSD | Nobles, Rock | 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.