Alert archive / South Dakota / Special Weather Statements in 2012

Special Weather Statement, NWS Rapid City, SD

July 1, 2012Tripp County, South Dakota

NWS Rapid City, SD issued this special weather statement at Jul 1, 2012, 12:21 AM CDT for Tripp County, 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 outline as issued.

The facts

Issued
Jul 1, 2012, 12:21 AM CDT (05:21 UTC)
Expired
Jul 1, 2012, 12:45 AM CDT
In force
24 min
Issued by
NWS Rapid City, SD

County Tripp County, SD

The radar

The North Platte radar (KLNX), 157 km from the middle of the area, began a volume at 05:23 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 nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 5.4 hours before the alert went out and 238 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-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 2012-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1193 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2012-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1193 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
2484 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jun 30, 8:58 PM CDT, 3 hours 23 minutes earlier.

Area forecast discussion, Jun 30, 8:58 PM CDT, 3 hours 23 minutes before
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Hazardous weather outlook, Jun 30, 7:00 AM CDT, 17 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
600 AM MDT SAT JUN 30 2012

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-011300-
BENNETT-BUTTE-CENTRAL BLACK HILLS-CUSTER CO PLAINS-FALL RIVER-HAAKON-
HARDING-HERMOSA FOOT HILLS-JACKSON-MELLETTE-NORTHEASTERN CROOK-
NORTHERN BLACK HILLS-NORTHERN CAMPBELL-NORTHERN FOOT HILLS-
NORTHERN MEADE CO PLAINS-PENNINGTON CO PLAINS-PERKINS-RAPID CITY-
SHANNON-SOUTHERN BLACK HILLS-SOUTHERN CAMPBELL-SOUTHERN FOOT HILLS-
SOUTHERN MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-TODD-TRIPP-
WESTERN CROOK-WESTON-WYOMING BLACK HILLS-ZIEBACH-
600 AM MDT (700 AM CDT) SAT JUN 30 2012

...FIRE WEATHER WATCH IN EFFECT SUNDAY MORNING THROUGH EARLY SUNDAY
EVENING FOR LOW RELATIVE HUMIDITY VALUES AND GUSTY WINDS FOR THE
LOWER ELEVATIONS OF NORTHEAST WYOMING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND
NORTHEASTERN WYOMING.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND EVENING. THERE IS
A SLIGHT RISK THAT SOME STORMS MAY BECOME SEVERE...PARTICULARLY
ALONG AND EAST OF A LINE FROM PHILIP TO PINE RIDGE. LARGE HAIL AND
DAMAGING WIND GUSTS WILL BE THE MAIN THREATS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

TEMPERATURES WILL CLIMB TO NEAR 100 DEGREES ON SUNDAY WHILE RELATIVE
HUMIDITY VALUES DROP TO UNDER 10 PERCENT OVER THE LOWER ELEVATIONS
OF NORTHEAST WYOMING. GUSTY SOUTHERLY WINDS MAY DEVELOP...WHICH
COULD RESULT IN CRITICAL FIRE WEATHER CONDITIONS FROM LATE SUNDAY
MORNING INTO EARLY SUNDAY EVENING.

THERE WILL BE A NEAR DAILY CHANCE FOR THUNDERSTORMS FROM SUNDAY
THROUGH FRIDAY FOR VARIOUS PARTS OF THE REGION. ALTHOUGH WIDESPREAD
SEVERE WEATHER IS NOT EXPECTED AT THIS TIME...A FEW SEVERE STORMS
WITH LARGE HAIL OR DAMAGING WIND GUSTS WILL BE POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Local storm report, Jun 30, 9:10 PM CDT, 3 hours 11 minutes before
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Local storm report, Jun 30, 9:36 PM CDT, 2 hours 45 minutes before
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Special weather statement, Jun 30, 10:16 PM CDT, 2 hours 5 minutes before
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Special weather statement, Jun 30, 11:09 PM CDT, 1 hour 12 minutes before
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Special weather statement, Jun 30, 11:37 PM CDT, 44 minutes before
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Special weather statement, Jul 1, 12:21 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 7:09 PM CDTSevere Thunderstorm WarningUNRHaakon, Meade, Pennington66 min
Jun 30, 7:54 PM CDTSevere Thunderstorm WarningUNRPennington66 min
Jun 30, 8:07 PM CDTSevere Thunderstorm WarningUNRHaakon, Jackson, Pennington53 min
Jun 30, 8:47 PM CDTSevere Thunderstorm WarningUNRBennett, Jackson, Pennington37 min
Jun 30, 8:56 PM CDTSevere Thunderstorm WarningUNRHaakon, Jackson26 min
Jun 30, 10:16 PM CDTSpecial Weather StatementUNRMellette, Tripp44 min
Jun 30, 10:47 PM CDTSevere Thunderstorm WarningUNRTripp19 min
Jun 30, 11:09 PM CDTSpecial Weather StatementUNRMellette36 min
Jun 30, 11:34 PM CDTAreal Flood AdvisoryUNRMellette, Tripp3 hr
Jun 30, 11:37 PM CDTSpecial Weather StatementUNRTripp23 min
Jul 1, 1:18 AM CDTSpecial Weather StatementUNRTripp42 min
Jul 1, 3:37 PM CDTHeat AdvisoryUNRBennett, Haakon, Jackson, Mellette, Todd, Tripp and 1 more3 days
Jul 1, 6:14 PM CDTSpecial Weather StatementUNRFall River31 min
Jul 1, 6:48 PM CDTSevere Thunderstorm WarningUNRFall River57 min
Jul 1, 6:53 PM CDTSpecial Weather StatementUNRLawrence52 min
Jul 1, 6:59 PM CDTSevere Thunderstorm WarningUNRButte, Lawrence, Meade61 min
Jul 1, 5:34 AM CDTRed Flag WarningUNR16 hr
Jul 1, 5:16 PM CDTSpecial Weather StatementUNRWeston44 min
Jul 1, 5:34 PM CDTSevere Thunderstorm WarningUNRCrook, Weston56 min

Nearby

Special Weather Statements in South Dakota, 2012Every special weather statement in 2012

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.