Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 52, NWS Rapid City, SD

June 12, 20174 counties in South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 12, 2017, 11:53 PM MDT for 4 counties in South Dakota. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 12, 2017, 11:53 PM MDT (05:53 UTC)
Expired: Jun 13, 2017, 12:17 AM MDT
In force: 24 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Bennett County, SD, Jackson County, SD, Mellette County, SD, Todd County, SD

The radar

The Rapid City radar (KUDX), 153 km from the middle of the area, began a volume at 05:55 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 12, 5:35 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 5.9 hours before the alert went out and 154 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: 421 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1755 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.0

Open this sounding in Storm Lab

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 Jun 12, 11:05 PM MDT, 48 minutes earlier.

Area forecast discussion, Jun 12, 11:05 PM MDT, 48 minutes before

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Hazardous weather outlook, Jun 12, 5:24 AM MDT, 18 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service Rapid City SD
524 AM MDT Mon Jun 12 2017

SDZ012>014-024>032-041>044-046-047-072>074-WYZ054>058-071-131300-
Butte-Northern Meade Co Plains-Ziebach-Northern Black Hills-
Northern Foot Hills-Rapid City-Southern Foot Hills-
Central Black Hills-Southern Black Hills-Custer Co Plains-
Pennington Co Plains-Haakon-Fall River-Oglala Lakota-Jackson-
Bennett-Mellette-Todd-Sturgis/Piedmont Foot Hills-
Southern Meade Co Plains-Hermosa Foot Hills-Northern Campbell-
Southern Campbell-Western Crook-Wyoming Black Hills-Weston-
Northeastern Crook-
524 AM MDT Mon Jun 12 2017 /624 AM CDT Mon Jun 12 2017/

This Hazardous weather outlook is for portions of south central
South Dakota...the Black Hills of South Dakota...western South
Dakota...northeast Wyoming...and the Black Hills of Wyoming.

.DAY ONE...Today and Tonight

An unseasonably strong storm system will affect the area this
afternoon and tonight. There is a moderate risk of severe
thunderstorms over far southwestern South Dakota and parts of
northeastern Wyoming, with an enhanced risk of severe storms
elsewhere. All threats are possible, including very large hail,
damaging winds, and a few tornadoes. The best chance for tornadoes
will be over northeastern Wyoming and far southwestern South
Dakota. In addition, locally heavy rainfall also is possible with
this system.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

There will be slight chances of thunderstorms periodically
throughout the rest of the week, but organized severe weather is
not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed today, mainly for southwestern
parts of the area.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

SDZ001-002-049-131300-
Harding-Perkins-Tripp-
524 AM MDT Mon Jun 12 2017 /624 AM CDT Mon Jun 12 2017/

This Hazardous weather outlook is for portions of south central
South Dakota...and western South Dakota.

.DAY ONE...Today and Tonight

An unseasonably strong storm system will affect the area this
evening and overnight. There is a slight risk of severe
thunderstorms. The main threats are large hail and damaging In
addition, locally heavy rainfall also is possible with this
system.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

There will be slight chances of thunderstorms periodically
throughout the rest of the week, but organized severe weather is
not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

Bunkers

In the hours before

Local storm report, Jun 12, 8:04 PM MDT, 3 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
804 PM MDT MON JUN 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     HAIL             8 E SMITHWICK           43.32N 103.07W
06/12/2017  E1.00 INCH       FALL RIVER         SD   TRAINED SPOTTER

&&

EAGAN

Local storm report, Jun 12, 8:07 PM MDT, 3 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE RAPID CITY SD
807 PM MDT MON JUN 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0743 PM     HAIL             8 E SMITHWICK           43.32N 103.07W
06/12/2017  E1.00 INCH       FALL RIVER         SD   TRAINED SPOTTER

&&

CORRECTED EVENT TIME

EAGAN

Local storm report, Jun 12, 9:33 PM MDT, 2 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
933 PM MDT MON JUN 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 PM     HAIL             11 W ROCKYFORD          43.52N 102.71W
06/12/2017  E1.00 INCH       OGLALA LAKOTA      SD   NWS EMPLOYEE

&&

EAGAN

Local storm report, Jun 12, 9:42 PM MDT, 2 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
942 PM MDT MON JUN 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0920 PM     TSTM WND GST     3 E KYLE                43.42N 102.13W
06/12/2017  E65 MPH          OGLALA LAKOTA      SD   TRAINED SPOTTER

&&

EAGAN

Local storm report, Jun 12, 9:47 PM MDT, 2 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE RAPID CITY SD
947 PM MDT MON JUN 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0844 PM     HAIL             11 W ROCKYFORD          43.52N 102.71W
06/12/2017  E1.00 INCH       OGLALA LAKOTA      SD   NWS EMPLOYEE

&&

CORRECTED EVENT TIME

EAGAN

Local storm report, Jun 12, 10:12 PM MDT, 1 hour 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
1012 PM MDT MON JUN 12 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 PM     TORNADO          4 WNW SWETT             43.20N 102.03W
06/12/2017                   BENNETT            SD   PUBLIC

            VISIBLE FOR 5 MINUTES BEFORE RAIN REDUCED VISIBILITY

&&

EAGAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 6:23 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River, Oglala Lakota	82 min
Jun 12, 6:40 PM MDT	Special Weather Statement	UNR		35 min
Jun 12, 6:55 PM MDT	Tornado Warning	UNR	Fall River, Oglala Lakota	35 min
Jun 12, 7:43 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River, Oglala Lakota	62 min
Jun 12, 8:31 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Oglala Lakota	44 min
Jun 12, 8:39 PM MDT	Tornado Warning	UNR	Bennett, Oglala Lakota	36 min
Jun 12, 8:43 PM MDT	Severe Thunderstorm Warning	UNR	Oglala Lakota, Pennington	34 min
Jun 12, 9:13 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson, Oglala Lakota, Pennington	62 min
Jun 12, 9:53 PM MDT	Severe Thunderstorm Warning	UNR	Fall River	67 min
Jun 12, 9:59 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Haakon, Jackson, Mellette, Todd	76 min
Jun 12, 10:51 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River, Oglala Lakota, Pennington	54 min
Jun 12, 11:14 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson, Mellette, Todd	50 min
Jun 12, 11:43 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River, Oglala Lakota, Pennington	77 min
Jun 13, 1:21 AM MDT	Special Weather Statement	UNR	Haakon	24 min
Jun 13, 1:43 AM MDT	Special Weather Statement	UNR	Haakon	47 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.