Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 977

May 29, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 29, 2004, 5:01 PM CDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
May 29, 2004, 5:01 PM CDT (22:01 UTC)
Expired
May 29, 2004, 7:00 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 94 counties

Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Big Stone County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Watonwan County, MN, Yellow Medicine County, MN, Antelope County, NE, Boyd County, NE, Cedar County, NE, Dakota County, NE, Dixon County, NE, Holt County, NE, Knox County, NE, Pierce County, NE, Wayne County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Marshall County, SD, McCook County, SD, McPherson County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 33 km from the middle of the area, began a volume at 22:03 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

Aberdeen, SD (KABR), launched 12:00Z, 10.0 hours before the alert went out and 213 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, Aberdeen, SD at 12:00Z on 2004-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 426 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, Aberdeen, SD at 12:00Z on 2004-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 272 square meters per square second.19395878Sfc1 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
426 J/kg
Mixed-layer CIN
-337 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
272 m²/s²
0-3 km storm-relative helicity
302 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

956 
ACUS11 KWNS 292201
SWOMCD
SPC MCD 292201 
MNZ000-IAZ000-NEZ000-SDZ000-300000-

MESOSCALE DISCUSSION 0977
NWS STORM PREDICTION CENTER NORMAN OK
0501 PM CDT SAT MAY 29 2004

AREAS AFFECTED...ERN SD...SWRN MN...NERN NEB...NWRN IA

CONCERNING...TORNADO WATCH 321...

VALID 292201Z - 300000Z

CONDITIONS REMAIN FAVORABLE FOR TORNADIC DEVELOPMENT.

INSTABILITY CONTINUES TO INCREASE WITH MLCAPES NOW 2500-3000 J/KG. 
STORMS OVER ERN SD AND NERN NEB. ARE ENTERING INTO INCREASINGLY
FAVORABLE LOW LEVEL SHEAR ENVIRONMENT FOR TORNADOES WITH VWPS
INDICATING 0-1 SRH IN EXCESS OF 150 M2/S2 ALONG WARM FRONT /  OLD
OUTFLOW BOUNDARY.

..JEWELL.. 05/29/2004

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

ATTN...WFO...MPX...DMX...FGF...FSD...OAX...ABR...LBF...

42209407 42169925 45939996 45879434

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 7:31 PM CDTMesoscale DiscussionSPCCherokee, Crawford, Harrison, Ida, Lyon, Monona and 6 more89 min
May 28, 9:03 PM CDTMesoscale DiscussionSPCAudubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 24 more57 min
May 28, 9:50 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 15 more5 hr
May 28, 11:41 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 16 more94 min
May 29, 12:42 PM CDTMesoscale DiscussionSPCAdair, Appanoose, Audubon, Boone, Buena Vista, Calhoun and 45 more93 min
May 29, 2:05 PM CDTTornado WatchSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 13 more8 hr
May 29, 3:05 PM CDTTornado WatchSPCCarroll, Crawford, Fremont, Harrison, Mills, Monona and 4 more7 hr
May 29, 4:35 PM CDTTornado WatchSPCAdair, Adams, Boone, Cass, Clarke, Dallas and 15 more5 hr
May 29, 3:25 PM CDTSevere Thunderstorm WatchSPCBecker, Clay, Douglas, Grant, Norman, Otter Tail and 2 more6 hr
May 29, 1:02 PM CDTMesoscale DiscussionSPCAdams, Clay, Fillmore, Franklin, Gage, Hall and 10 more118 min
May 29, 1:54 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Hayes, Hitchcock, Perkins and 1 more3 hr
May 29, 3:55 PM CDTSevere Thunderstorm WatchSPCDundy, Furnas, Hitchcock, Red Willow6 hr
May 29, 5:16 PM CDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Clay, Custer, Dawson and 20 more59 min
May 29, 5:53 PM CDTMesoscale DiscussionSPCHayes, Hitchcock, Red Willow67 min

Nearby

Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in Iowa, 2004Every mesoscale discussion in 2004

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.