Alert archive / South Dakota / Tornado Warnings in 2008

Tornado Warning 17, NWS Rapid City, SD

July 26, 2008Haakon County, Ziebach County, South Dakota

NWS Rapid City, SD issued this tornado warning at Jul 26, 2008, 9:24 PM MDT for Haakon County, Ziebach County, South Dakota. It was in force for 26 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: Jul 26, 2008, 9:24 PM MDT (03:24 UTC)
Expired: Jul 26, 2008, 9:50 PM MDT
In force: 26 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon

Counties Haakon County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 113 km from the middle of the area, began a volume at 03:26 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
Jul 26, 8:02 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 3.4 hours before the alert went out and 120 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: 1743 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 2546 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 Jul 26, 8:17 PM MDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jul 26, 8:17 PM MDT, 1 hour 7 minutes before

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Hazardous weather outlook, Jul 26, 10:51 AM MDT, 10 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
1051 AM MDT SAT JUL 26 2008

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-271300-
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-
1051 AM MDT (1151 AM CDT) SAT JUL 26 2008

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

.DAY ONE...TODAY AND TONIGHT

A WIDESPREAD SEVERE WEATHER OUTBREAK IS FORECAST FOR
THIS AFTERNOON THROUGH THIS EVENING. A STRONG UPPER LEVEL
DISTURBANCE WILL MOVE ACROSS THE NORTHERN PLAINS INTO A VERY MOIST
AND UNSTABLE AIRMASS. THE BEST CHANCE OF THUNDERSTORMS IS IN
AN AREA EXTENDING FROM NORTHWEST SOUTH DAKOTA SOUTHEASTWARD INTO
SOUTH CENTRAL SOUTH DAKOTA. THE MAIN THREATS FROM THESE STORMS WILL
BE LARGE HAIL...GUSTY WINDS...AND HEAVY RAINFALL. THERE IS ALSO THE
THREAT FOR TORNADOES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS A CHANCE FOR SEVERE THUNDERSTORMS AGAIN ON SUNDAY AS
ANOTHER STRONG UPPER LEVEL DISTURBANCE CROSSES THE NORTHERN
PLAINS STATES. A CHANCE OF THUNDERSTORMS IS FORECAST FOR EACH DAY
MONDAY THROUGH WEDNESDAY AS OCCASIONAL WEAK UPPER LEVEL DISTURBANCES
AND A MOIST UNSTABLE AIRMASS CONTINUE TO COLLIDE OVER WESTERN SOUTH
DAKOTA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON.

In the hours before

Local storm report, Jul 26, 7:56 PM MDT, 1 hour 28 minutes before

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Local storm report, Jul 26, 7:58 PM MDT, 1 hour 26 minutes before

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Local storm report, Jul 26, 8:08 PM MDT, 1 hour 16 minutes before

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Local storm report, Jul 26, 8:41 PM MDT, 43 minutes before

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Local storm report, Jul 26, 8:45 PM MDT, 39 minutes before

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Local storm report, Jul 26, 9:05 PM MDT, 19 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
Jul 26, 6:30 PM MDT	Severe Thunderstorm Warning	UNR	Butte	75 min
Jul 26, 7:07 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	68 min
Jul 26, 7:30 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade, Perkins	75 min
Jul 26, 7:46 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	59 min
Jul 26, 8:33 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Meade, Pennington, Perkins, Ziebach	87 min
Jul 26, 8:54 PM MDT	Severe Thunderstorm Warning	UNR	Bennett	47 min
Jul 26, 9:30 PM MDT	Severe Thunderstorm Warning	UNR	Haakon	60 min
Jul 27, 12:30 AM MDT	Severe Thunderstorm Warning	UNR	Harding, Perkins	60 min
Jul 27, 1:17 AM MDT	Severe Thunderstorm Warning	UNR	Perkins	58 min
Jul 27, 2:13 AM MDT	Severe Thunderstorm Warning	UNR	Perkins	62 min
Jul 26, 6:01 PM MDT	Severe Thunderstorm Warning	UNR	Weston	74 min

Nearby

Tornado Warnings in South Dakota, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.