Alert archive / South Dakota / Mesoscale Discussions in 2010

Mesoscale Discussion 310

April 13, 20104 states

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2010, 2:44 PM MDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2010, 2:44 PM MDT (20:44 UTC)
Expired
Apr 13, 2010, 4:15 PM MDT
In force
91 min
Issued by
the Storm Prediction Center
All 67 counties

Sedgwick County, CO, Adams County, ND, Burleigh County, ND, Dunn County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, Logan County, ND, McIntosh County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Sheridan County, ND, Sioux County, ND, Stark County, ND, Ward County, ND, Wells County, ND, Arthur County, NE, Blaine County, NE, Brown County, NE, Cherry County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 152 km from the middle of the area, began a volume at 20:45 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 12:00Z, 8.7 hours before the alert went out and 158 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 12:00Z on 2010-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 161 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 12:00Z on 2010-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 199 square meters per square second.1939587897Sfc1 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
161 J/kg
Mixed-layer CIN
-310 J/kg
Mixed-layer LCL
1078 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
199 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

338 
ACUS11 KWNS 132045
SWOMCD
SPC MCD 132044
NDZ000-SDZ000-NEZ000-COZ000-132215-

MESOSCALE DISCUSSION 0310
NWS STORM PREDICTION CENTER NORMAN OK
0344 PM CDT TUE APR 13 2010

AREAS AFFECTED...ND...SD...WRN NEB...FAR NE CO

CONCERNING...SEVERE THUNDERSTORM WATCH 70...

VALID 132044Z - 132215Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 70
CONTINUES.

THE SEVERE THREAT IN WW 70 WILL LIKELY CONTINUE THROUGH WATCH
EXPIRATION AS STORMS GRADUALLY MOVE EWD INTO CNTRL ND...CNTRL SD AND
WCNTRL NEB. LARGE HAIL AND WIND DAMAGE CAN BE EXPECTED WITH THE MORE
INTENSE DISCRETE STORMS AND MORE ORGANIZED LINE-SEGMENTS.

A BROKEN LINE OF STRONG THUNDERSTORMS IS ONGOING FROM SW ND SWD INTO
WRN NEB ALONG THE WRN EDGE OF MODERATE INSTABILITY WHERE MLCAPE
VALUES CURRENTLY RANGE BETWEEN 1000 AND 1200 J/KG ACCORDING TO
OBJECTIVE ANALYSIS. REGIONAL WSR-88D VWPS ALONG THE INSTABILITY AXIS
SHOW STRONG DEEP LAYER SHEAR SUGGESTING A SEVERE THREAT WILL EXIST
ACROSS THE REGION LATE THIS AFTERNOON. OBJECTIVE ANALYSIS ALSO SHOWS
STEEP LOW-LEVEL LAPSE RATES AND 40 TO 50 KT OF FLOW AT 850 MB ACROSS
CNTRL SD AND CNTRL NEB. AS THE STORMS MOVE EWD INTO AN INCREASINGLY
FAVORABLE ENVIRONMENT...THE WIND DAMAGE MAY BECOME ENHANCED. IN
ADDITION...STEEP MID-LEVEL LAPSE RATES WILL BE FAVORABLE FOR LARGE
HAIL ESPECIALLY AS THE AIRMASS CONTINUES TO DESTABILIZE OVER THE
NEXT FEW HOURS.

..BROYLES.. 04/13/2010

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FGF...FSD...ABR...GID...BIS...LBF...UNR...BOU...
CYS...

LAT...LON   40809995 40560227 41190299 44310306 46550314 48110283
            48390200 48130079 48039911 46089883 43679893 42629931
            40809995

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 11:19 AM MDTMesoscale DiscussionSPCLogan, Phillips, Sedgwick86 min
Apr 13, 11:48 AM MDTSevere Thunderstorm WatchSPCLogan, Phillips, Sedgwick6 hr
Apr 13, 5:12 PM MDTMesoscale DiscussionSPCBent, Cheyenne, Kiowa, Kit Carson, Prowers93 min
Apr 13, 4:38 PM MDTMesoscale DiscussionSPCArthur, Blaine, Boyd, Brown, Chase, Hooker and 9 more97 min
Apr 12, 9:29 PM MDTMesoscale DiscussionSPCBarnes, Cass, Cavalier, Grand Forks, Griggs, Nelson and 7 more2 hr
Apr 13, 12:39 PM MDTMesoscale DiscussionSPCBurleigh, Dunn, Emmons, Grant, Kidder, LaMoure and 7 more2 hr

Nearby

Mesoscale Discussions in South Dakota, 2010Mesoscale Discussions in North Dakota, 2010Mesoscale Discussions in Nebraska, 2010Every mesoscale discussion in 2010

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.