Alert archive / South Dakota / Tornado Warnings in 2009

Tornado Warning 1, NWS Rapid City, SD

March 23, 2009Todd County, Tripp County, South Dakota

NWS Rapid City, SD issued this tornado warning at Mar 23, 2009, 3:48 PM CDT for Todd County, Tripp County, South Dakota. It was in force for 42 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: Mar 23, 2009, 3:48 PM CDT (20:48 UTC)
Expired: Mar 23, 2009, 4:30 PM CDT
In force: 42 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon

Counties Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 148 km from the middle of the area, began a volume at 20:49 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
Mar 23, 12:16 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.8 hours before the alert went out and 236 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: 7 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 742 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 Mar 23, 3:26 PM CDT, 22 minutes earlier.

Area forecast discussion, Mar 23, 3:26 PM CDT, 22 minutes before

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Hazardous weather outlook, Mar 23, 6:37 AM CDT, 9 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
537 AM MDT MON MAR 23 2009

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-241300-
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-
537 AM MDT (637 AM CDT) MON MAR 23 2009

...BLIZZARD WARNING THIS MORNING THROUGH TUESDAY MORNING FOR
   NORTHEASTERN WYOMING...
...BLIZZARD WARNING THIS MORNING THROUGH TUESDAY AFTERNOON FOR
   THE NORTHERN AND CENTRAL BLACK HILLS AND NORTHWESTERN SOUTH
   DAKOTA...
...BLIZZARD WARNING THIS AFTERNOON THROUGH TUESDAY AFTERNOON FOR MOST
   OF THE WESTERN SOUTH DAKOTA PLAINS...
...BLIZZARD WARNING TONIGHT THROUGH TUESDAY AFTERNOON FOR MELLETTE
   AND TODD COUNTIES...

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

.DAY ONE...TODAY AND TONIGHT

A MAJOR SPRING STORM SYSTEM WILL MOVE ACROSS THE CENTRAL ROCKIES
TODAY...AND MOVE INTO THE CENTRAL PLAINS TONIGHT AND TUESDAY. THIS
STORM SYSTEM WILL BRING SIGNIFICANT WIND AND SNOW TO NORTHEAST
WYOMING AND MUCH OF WESTERN SOUTH DAKOTA.

HEAVY SNOWS WILL SPREAD FROM WEST TO EAST TODAY ACROSS WESTERN SOUTH
DAKOTA AND CONTINUE THROUGH TONIGHT. VERY STRONG NORTHWEST WINDS
WILL COMBINE WITH THE HEAVY SNOW TO PRODUCE BLIZZARD CONDITIONS
THIS AFTERNOON AND TONIGHT OVER NORTHEAST WYOMING AND MUCH OF
WESTERN SOUTH DAKOTA.

THERE IS ALSO CHANCE OF THUNDERSTORMS TODAY ACROSS SOUTH CENTRAL
SOUTH DAKOTA. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS...WITH
LARGE HAIL AND WINDS IN EXCESS OF 58 MPH THE MAIN THREAT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

HEAVY SNOWS AND STRONG NORTHWEST WINDS WILL PRODUCE BLIZZARD
CONDITIONS ACROSS WESTERN SOUTH DAKOTA ON TUESDAY. THE SNOW WILL
SLOWLY DIMINISH ON TUESDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Special weather statement, Mar 23, 11:43 AM CDT, 4 hours 5 minutes before

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Special weather statement, Mar 23, 1:24 PM CDT, 2 hours 24 minutes before

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Local storm report, Mar 23, 2:24 PM CDT, 1 hour 24 minutes before

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Special weather statement, Mar 23, 2:52 PM CDT, 56 minutes before

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Special weather statement, Mar 23, 2:58 PM CDT, 50 minutes before

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Special weather statement, Mar 23, 3:37 PM CDT, 11 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
Mar 23, 9:09 AM CDT	River Flood Warning	UNR	Perkins	15 hr
Mar 23, 4:12 PM CDT	Winter Weather Advisory	UNR	Tripp	29 hr

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.