Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 1413

June 21, 200512 counties in North Dakota; 17 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2005, 5:32 AM MDT for 12 counties in North Dakota; 17 counties in South Dakota. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2005, 5:32 AM MDT (11:32 UTC)
Expired: Jun 21, 2005, 7:00 AM MDT
In force: 88 min
Issued by: the Storm Prediction Center

All 29 counties

Adams County, ND, Bowman County, ND, Burleigh County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Oliver County, ND, Sioux County, ND, Slope County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Harding County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, McPherson County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Bismarck radar (KBIS), 107 km from the middle of the area, began a volume at 11:32 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 11.5 hours before the alert went out and 109 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: 894 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: -44 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 211132
SWOMCD
SPC MCD 211132 
NDZ000-SDZ000-211300-

MESOSCALE DISCUSSION 1413
NWS STORM PREDICTION CENTER NORMAN OK
0632 AM CDT TUE JUN 21 2005

AREAS AFFECTED...SWRN AND S CENTRAL ND / NWRN INTO CENTRAL SD

CONCERNING...SEVERE THUNDERSTORM WATCH 509...

VALID 211132Z - 211300Z

SEVERE THREAT CONTINUES ACROSS PARTS OF WW...AND APPEARS TO BE
INCREASING S OF WW.  NEW WATCH MAY BE REQUIRED INTO PARTS OF NWRN /
CENTRAL SD.

LATEST RADAR IMAGERY SHOWS NRN PORTION OF BOW ECHO WEAKENING RAPIDLY
AS IT ENCOUNTERS MUCH MORE STABLE AIRMASS ACROSS CENTRAL ND. 
MEANWHILE...UPDRAFTS REMAIN INTENSE ACROSS SRN PORTIONS OF LINE /
ACROSS SWRN ND...WITH A TURN TOWARD THE SE APPARENT OVER THE PAST
HOUR.

WITH GRADIENT ALONG NERN PORTIONS OF INSTABILITY AXIS EVIDENT ACROSS
NWRN AND INTO CENTRAL SD AND SELY LOW-LEVEL JET PERSISTING ACROSS
THIS AREA...IT APPEARS THAT STORMS SHOULD CONTINUE / MOVE SSEWD OVER
THE NEXT FEW HOURS INTO NWRN AND N CENTRAL SD. WITH STORMS LIKELY
TO REMAIN LINEARLY ORGANIZED ALONG LEADING EDGE OF COLD
POOL...THREAT FOR DAMAGING WINDS ALONG WITH HAIL WILL LIKELY
ACCOMPANY THESE STORMS.

..GOSS.. 06/21/2005

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

ATTN...WFO...ABR...BIS...UNR...

46420313 46780192 47330111 46919968 46429903 44659871
43969934 43940074 45330366 46480372

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 10:01 PM MDT	Mesoscale Discussion	SPC	Billings, Dunn, Golden Valley, McKenzie, Slope, Williams	59 min
Jun 20, 10:35 PM MDT	Severe Thunderstorm Watch	SPC	Billings, Burke, Divide, Dunn, Golden Valley, McKenzie and 3 more	7 hr
Jun 21, 1:58 AM MDT	Mesoscale Discussion	SPC	Billings, Dunn, Golden Valley, McKenzie, Mountrail, Stark and 1 more	92 min
Jun 21, 2:50 AM MDT	Mesoscale Discussion	SPC	Adams, Burleigh, Dunn, Emmons, Grant, Hettinger and 7 more	85 min
Jun 21, 3:20 AM MDT	Severe Thunderstorm Watch	SPC	Burleigh, Dunn, Eddy, Emmons, Foster, Grant and 15 more	6 hr
Jun 20, 9:00 PM MDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brookings, Brule, Charles Mix, Clay and 14 more	60 min

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in North Dakota, 2005 Every mesoscale discussion in 2005

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.