Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 271, NWS Rapid City, SD

July 30, 2001Ziebach County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 30, 2001, 8:40 PM MDT for Ziebach County, South Dakota. It was in force for 65 min. 4 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 30, 2001, 8:40 PM MDT (02:40 UTC)
Expired: Jul 30, 2001, 9:45 PM MDT
In force: 65 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Ziebach County, SD

The radar

The Rapid City radar (KUDX), 132 km from the middle of the area, began a volume at 02:41 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
Jul 30, 8:50 PM MDT	Thunderstorm Wind 66 M	Cherry Creek, SD
Jul 30, 8:55 PM MDT	Thunderstorm Wind 61 E	Cherry Creek, SD
Jul 30, 9:35 PM MDT	Thunderstorm Wind 59 M	Dupree, SD
Jul 30, 9:36 PM MDT	Thunderstorm Wind 59 M	Cherry Creek, SD

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, 7:00 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.7 hours before the alert went out and 140 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: 2241 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 2336 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 30, 2:00 PM MDT, 6 hours 40 minutes earlier.

Area forecast discussion, Jul 30, 2:00 PM MDT, 6 hours 40 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL
WEATHER SERVICE RAPID CITY SD
200 PM MDT MON JUL 30 2001

CURRENT SURFACE MAP HAS BOUNDARY FROM SOUTHWEST TO NORTH CENTRAL
SOUTH DAKOTA...WITH WEAK LOW NEAR KD07.  60+ DEWPOINTS SOUTH OF THE
BOUNDARY...AND WRAPPING AROUND THE NORTH SIDE OF THE LOW.

AREA OF CONVECTION DEVELOPING OVER THE HIGHER TERRAIN OF EAST
CENTRAL WYOMING THIS AFTERNOON AS WEAK SHORTWAVE LIFTS THROUGH THE
AREA. FURTHER DEVELOPMENT ALONG THE BOUNDARY INTO SOUTHWEST SOUTH
DAKOTA EXPECTED THIS EVENING...HOWEVER WILL BE FIGHTING A STRONG CAP
IN PLACE. LATER TONIGHT...LOW LEVEL JET INCREASES OVER EASTERN HALF
OF CWA. CONVECTIVE FEEDBACK ON THE ETA AND AVN INDICATING MCS TO
DEVELOP ACROSS NORTHWEST SOUTH DAKOTA INTO NORTH DAKOTA. BOUNDARY
SLIDES SOUTH ACROSS THE AREA TUESDAY...WITH WESTERN SOUTH
DAKOTA/NORTHEAST WYOMING IN RIGHT ENTRANCE REGION OF THE JET. THIS
WILL KEEP THE NORTHWEST CLOUDY AND COOLER WITH A CHANCE OF
SHOWERS/THUNDERSTORMS THROUGH THE DAY. SOUTH CENTRAL COUNTIES WILL
WARM UP AHEAD OF THE FRONT...WITH A ROUND OF AFTERNOON/EVENING
THUNDERSTORMS.

FORECAST SOUNDINGS SUPPORT SEASONAL TEMPERATURES ON WEDNESDAY WITH
DRY CONDITIONS. UPPER LEVEL RIDGE BUILDS FOR THURSDAY AND
FRIDAY...WITH TEMPERATURES CLIMBING BACK INTO THE 90S. UPPER LEVEL
TROF TO MOVE THROUGH THE NORTHERN PLAINS THIS WEEKEND...SO INCLUDED
A CHANCE OF THUNDERSTORMS BOTH DAYS. BACK TO SOME RIDGING FOR
MONDAY.

.UNR...NONE.

KC

In the hours before

Local storm report, Jul 30, 8:38 PM MDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
838 PM MDT MON JUL 30 2001

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0515 PM    15 W OELRICHS             SD   WIND DAMAGE
07/30/01   FALL RIVER                     LARGE HAIL AND HIGH
                                          WINDS DAMAGED
                                          CONSTRUCTION SIGNS.
                                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0620 PM    9 E ORAL                  SD   70 MPH TSTM GUST
07/30/01   FALL RIVER                     6 INCH DIAMETER TREE
                                          LIMBS DOWNED. REPORTED
                                          BY STORM SPOTTER.

0700 PM    HERMOSA                   SD   60 MPH TSTM GUST
07/30/01   CUSTER                         REPORTED BY MEDIA.

0700 PM    3 SSW HERMOSA             SD   65 MPH TSTM GUST
07/30/01   CUSTER                         REPORTED BY STORM
                                          SPOTTER.

0715 PM    1 W CAPUTA                SD   60 MPH TSTM GUST
07/30/01   PENNINGTON                     REPORTED BY STORM
                                          SPOTTER.

0722 PM    (RAP)RAPID CITY ARPT      SD   66 MPH TSTM GUST
07/30/01   PENNINGTON                     ASOS

0723 PM    RAPID CITY                SD   72 MPH TSTM GUST
07/30/01   PENNINGTON                     WFO RAPID CITY

0730 PM    3 W (RAP)RAPID CITY ARPT  SD   WIND DAMAGE
07/30/01   PENNINGTON                     DOWNED POWER LINES IN
                                          RAPID VALLEY. REPORTED
                                          BY MEDIA.

0745 PM    HEREFORD                  SD   70 MPH TSTM GUST
07/30/01   MEADE                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0800 PM    HEREFORD                  SD   TORNADO
07/30/01   MEADE                          LIKELY A GUSTNADO.
                                          REPORTED BY PUBLIC.

0814 PM    12 N WALL                 SD   70 MPH TSTM GUST
07/30/01   PENNINGTON                     REPORTED BY STORM
                                          SPOTTER.

0815 PM    ENNING                    SD   FUNNEL CLOUD
07/30/01   MEADE                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 6:33 PM MDT	Severe Thunderstorm Warning	UNR	Custer	57 min
Jul 30, 6:38 PM MDT	Severe Thunderstorm Warning	UNR		67 min
Jul 30, 6:57 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	48 min
Jul 30, 7:23 PM MDT	Severe Thunderstorm Warning	UNR	Meade	52 min
Jul 30, 7:34 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	41 min
Jul 30, 8:15 PM MDT	Severe Thunderstorm Warning	UNR	Haakon	45 min
Jul 30, 8:18 PM MDT	Severe Thunderstorm Warning	UNR	Meade	57 min
Jul 30, 9:00 PM MDT	Severe Thunderstorm Warning	UNR	Haakon	60 min
Jul 30, 9:08 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	67 min
Jul 30, 10:02 PM MDT	Severe Thunderstorm Warning	UNR	Meade	58 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.