Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 176, NWS Aberdeen, SD

July 31, 2001Campbell County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 31, 2001, 12:17 AM CDT for Campbell County, South Dakota. It was in force for 13 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 31, 2001, 12:17 AM CDT (05:17 UTC)
Expired: Jul 31, 2001, 12:30 AM CDT
In force: 13 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Campbell County, SD

The radar

The Bismarck radar (KBIS), 124 km from the middle of the area, began a volume at 05:19 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 31, 12:20 AM CDT	Thunderstorm Wind 61 E	Pollock, SD	Very strong winds blew down many tree branches and also bent some signs over.

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 30, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 5.3 hours before the alert went out and 122 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: 3783 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 3.6
Supercell composite: 14.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KABR 310518
SVRABR

SDC021-310530-
/NEW.KABR.SV.W.0256.310517-310530/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
1217 AM CDT TUE JUL 31 2001

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CAMPBELL COUNTY IN NORTH CENTRAL SOUTH DAKOTA

* UNTIL 1230 AM CDT

* AT 1217 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 3 MILES WEST OF POLLOCK TO 16
  MILES SOUTH OF ARTAS...OR FROM 18 MILES SOUTHWEST OF STRASBURG TO 9
  MILES SOUTHWEST OF EUREKA...MOVING NORTHEAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  ARTAS AROUND 1230 AM CDT

WINDS GUSTED TO 67 MPH AT MOBRIDGE AS THESE STORMS MOVED THROUGH 
WALWORTH COUNTY.

THIS IS A DANGEROUS STORM. TAKE SHELTER NOW!

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. GO INSIDE A
STURDY BUILDING AND STAY AWAY FROM WINDOWS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
ABERDEEN.

$$
LAT...LON 4582 10035 4560 9973 4593 9973 4629 10043

BINAU


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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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 30, 8:45 PM CDT, 3 hours 32 minutes earlier.

Area forecast discussion, Jul 30, 8:45 PM CDT, 3 hours 32 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTHCENTRAL AND NORTHEAST
SOUTH DAKOTA AND WEST CENTRAL MINNESOTA
NATIONAL WEATHER SERVICE ABERDEEN SD
845 PM CDT MON JUL 30 2001

MAIN SFC BOUNDARY STILL REMAINS ON A KJMS-KPIR-KCDR LINE THIS
EVENING. TSRA HAVE FIRED IN FAR SWRN SD NEAR TRIPLE POINT REGION.
CONCERN IS HOW FAR NE WILL THIS CONVECTION PUSH? 00Z KABR SOUNDING
WAS 14.2 C @ 7H...WITH VERY STEEP LAPSE RATE ABOVE CAP LAYER. 18Z
AVN SOUNDING BEST REPRESENTED 00Z SOUNDING...AND SEEMS TO CORRELATE
WELL WITH REALITY. LEFT POPS IN FOR ALL CWA OVERNIGHT AS LEFT OVER
CONVECTION FROM TSRA IN SWRN SD COULD DRIFT OVER DURING THE
OVERNIGHT HOURS. AFTER SEEING THE LOW CLOUDS THIS MORNING...BRIEFLY
TOYED WITH THE IDEA OF ADDING SOME FOG TO THE ERN ZONES.
HOWEVER...MODELS ALL SHOW WINDS STAYING UP OVERNIGHT SO THE LOWER
LAYERS SHOULD REMAIN WELL MIXED KEEPING FOG AT BAY...AS WELL AS
OVERNIGHT LOWS UP. EXCEPT FOR ADDING WATCH BOX EARLIER...NO OTHER
TWEAKS MADE TO ZONE PACKAGE.

.ABR...SVR TSRA WATCH 643 FOR CORSON...DEWEY...STANLEY AND JONES
       COUNTIES UNTIL 0600 UTC.

HINTZ

In the hours before

Local storm report, Jul 30, 11:55 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN, SD
1155 PM CDT MON JUL 30 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....
`
1148 PM    MOBRIDGE                  SD   62 MPH TSTM WIND GUST
07/30/01   WALWORTH                       GUST RECORDED BY ASOS.

The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 10:08 PM CDT	Severe Thunderstorm Warning	ABR	Dewey	67 min
Jul 30, 10:21 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	39 min
Jul 30, 11:15 PM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey, Walworth	60 min
Jul 30, 11:15 PM CDT	Severe Thunderstorm Warning	ABR	Campbell	60 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2001 Every severe thunderstorm warning in 2001

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.