Alert archive / South Dakota / Tornado Warnings in 2009

Tornado Warning 11, NWS Rapid City, SD

June 15, 2009Haakon County, South Dakota

NWS Rapid City, SD issued this tornado warning at Jun 15, 2009, 9:26 PM MDT for Haakon County, South Dakota. It was in force for 33 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 15, 2009, 9:26 PM MDT (03:26 UTC)
Expired: Jun 15, 2009, 9:59 PM MDT
In force: 33 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon

County Haakon County, SD

The radar

The Rapid City radar (KUDX), 105 km from the middle of the area, began a volume at 03:28 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, 3.4 hours before the alert went out and 110 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: 199 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1658 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -77 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jun 15, 9:14 PM MDT, 12 minutes earlier.

Area forecast discussion, Jun 15, 9:14 PM MDT, 12 minutes before

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Hazardous weather outlook, Jun 15, 3:56 AM MDT, 17 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
356 AM MDT MON JUN 15 2009

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-161300-
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-
356 AM MDT (456 AM CDT) MON JUN 15 2009

...FLOOD WATCH IN EFFECT THIS AFTERNOON AND TONIGHT FOR NORTHWEST
   SOUTH DAKOTA...THE NORTHERN BLACK HILLS...AND THE BEARLODGE
   MOUNTAINS...

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

.DAY ONE...TODAY AND TONIGHT

AN ACTIVE WEATHER PATTERN WILL BRING ANOTHER CHANCE OF SHOWERS
AND THUNDERSTORMS ACROSS THE AREA TODAY AND TONIGHT. SOME OF THESE
STORMS MAY BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS. THESE
STORMS MAY ALSO CONTAIN LOCALLY HEAVY RAINFALL...WHICH WILL FALL ON
GROUND THAT HAS ALREADY BEEN SATURATED FROM HEAVY RAINS SUNDAY
NIGHT. THIS MAY RESULT IN THE FLOODING OF SOME AREA CREEKS AND
RIVERS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS A CHANCE FOR THUNDERSTORMS FROM TUESDAY THROUGH THURSDAY
AS MULTIPLE UPPER LEVEL DISTURBANCES MOVE THROUGH THE REGION.
WIDESPREAD SEVERE WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Local storm report, Jun 15, 7:08 PM MDT, 2 hours 18 minutes before

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Local storm report, Jun 15, 7:21 PM MDT, 2 hours 5 minutes before

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Local storm report, Jun 15, 7:40 PM MDT, 1 hour 46 minutes before

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Local storm report, Jun 15, 8:09 PM MDT, 1 hour 17 minutes before

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Local storm report, Jun 15, 8:27 PM MDT, 59 minutes before

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Local storm report, Jun 15, 8:28 PM MDT, 58 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 6:31 PM MDT	Severe Thunderstorm Warning	UNR		59 min
Jun 15, 6:48 PM MDT	Severe Thunderstorm Warning	UNR	Bennett	57 min
Jun 15, 7:02 PM MDT	Severe Thunderstorm Warning	UNR	Mellette	58 min
Jun 15, 7:04 PM MDT	Severe Thunderstorm Warning	UNR	Mellette, Todd	24 min
Jun 15, 7:14 PM MDT	Severe Thunderstorm Warning	UNR	Ziebach	48 min
Jun 15, 7:49 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Todd	56 min
Jun 15, 7:51 PM MDT	Severe Thunderstorm Warning	UNR	Jackson, Mellette	54 min
Jun 15, 9:04 PM MDT	Severe Thunderstorm Warning	UNR	Haakon	56 min

Nearby

Tornado Warnings in South Dakota, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.