Alert archive / South Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 55, NWS Sioux Falls, SD

July 7, 1997Lincoln County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1997, 5:05 PM CDT for Lincoln County, South Dakota. 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, 5:05 PM CDT (22:05 UTC)
Expired: Jul 7, 1997, 5:35 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Lincoln County, SD

The radar

The Sioux Falls radar (KFSD), 34 km from the middle of the area, began a volume at 22:06 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, 5:17 PM CDT	Tornado F0	Hudson, SD	A brief tornado observed by a local spotter 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, 10.1 hours before the alert went out and 220 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFSD 072205 RRA
SVRFSD
SDC083-072235-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
505 PM CDT MON JUL 7 1997

* SEVERE THUNDERSTORM WARNING FOR
  LINCOLN COUNTY - IN SOUTHEASTERN SOUTH DAKOTA

* UNTIL 535 PM CDT
 
* SOME AREAS AFFECTED
  CANTON                   AROUND 505 PM CDT

* AT 502 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 13 MILES SOUTH OF SIOUX FALLS  OR 9 MILES
  WEST OF CANTON MOVING EAST AT 30 MPH.

THIS WARNING REPLACES THE TORNADO WARNING FOR LINCOLN COUNTY THAT
EXPIRED AT 5 PM.

A TORNADO WATCH IS ALSO IN EFFECT.  SEVERE THUNDERSTORMS CAN AND
OCCASIONALLY DO PRODUCE TORNADOES.
 
IF YOUl ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IN A HOME OR
BUSINESS IS AN INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE.  AVOID
WINDOWS.

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, 6 hours 35 minutes earlier.

Area forecast discussion, Jul 7, 10:30 AM CDT, 6 hours 35 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 12 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, 4:02 PM CDT	Severe Thunderstorm Warning	FSD	Turner	33 min
Jul 7, 4:14 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	46 min
Jul 7, 4:41 PM CDT	Tornado Warning	FSD	Lincoln, Minnehaha	29 min
Jul 7, 4:56 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	34 min
Jul 7, 5:08 PM CDT	Tornado Warning	FSD	Union	32 min
Jul 7, 5:16 PM CDT	Tornado Warning	FSD	Lincoln	34 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1997 Every 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.