Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 2196

September 10, 200417 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2004, 10:57 PM CDT for 17 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 10, 2004, 10:57 PM CDT (03:57 UTC)
Expired
Sep 11, 2004, 1:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Aurora County, SD, Beadle County, SD, Brule County, SD, Buffalo County, SD, Davison County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, Miner County, SD, Sanborn County, SD, Stanley County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 157 km from the middle of the area, began a volume at 03:57 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 00:00Z, 4.0 hours before the alert went out and 111 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 00:00Z on 2004-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 572 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 00:00Z on 2004-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -74 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
572 J/kg
Mixed-layer CIN
-345 J/kg
Mixed-layer LCL
1329 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-74 m²/s²
0-3 km storm-relative helicity
32 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.

081 
ACUS11 KWNS 110400
SWOMCD
SPC MCD 110357 
SDZ000-110600-

MESOSCALE DISCUSSION 2196
NWS STORM PREDICTION CENTER NORMAN OK
1057 PM CDT FRI SEP 10 2004

AREAS AFFECTED...CNTRL SD

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 110357Z - 110600Z

ISOLATED HAIL THREAT WILL LIKELY CONTINUE OVER THE NEXT 1-2 HOURS
ACROSS CNTRL SD.

SFC ANALYSIS SHOWS A COLD FRONT IN PLACE FROM THE RAPID CITY AREA
EXTENDING NEWD TO JUST WEST OF PIERRE SD. AN ONGOING SMALL MCS NEAR
THE FRONTAL ZONE IS CURRENTLY BEING SUPPORTED BY AN APPROACHING
SHORTWAVE TROUGH OVER FAR NWRN SD. AS A RESULT...THE MCS WILL LIKELY
CONTINUE TO TRACK EWD AFFECTING SCNTRL AND ECNTRL SD OVER THE NEXT
FEW HOURS. OBJECTIVE ANALYSIS SHOWS MLCAPE VALUES AROUND 1000 J/KG
COMBINED WITH MODERATE DEEP LAYER SHEAR (0-6 KM SHEAR OF 40 KT).
THIS WILL BE SUFFICIENT FOR ISOLATED SUPERCELLS. HAIL WILL BE THE
MAIN SEVERE WEATHER THREAT WITH MID-LEVEL LAPSE RATES AROUND 8.0
C/KM. ALTHOUGH NEW CELLS WILL CONTINUE TO DEVELOP OVERNIGHT...THE
SEVERE THREAT SHOULD BEGIN TO DECREASE AFTER MIDNIGHT.

..BROYLES.. 09/11/2004

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

ATTN...WFO...FSD...ABR...UNR...

44470100 44880040 44999903 44859793 44339745 43619757
43359887 43560031 43970098

Nearby

Mesoscale Discussions in South Dakota, 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.