Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 718

May 3, 200319 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 3, 2003, 8:25 PM MDT for 19 counties in South Dakota. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
May 3, 2003, 8:25 PM MDT (02:25 UTC)
Expired
May 3, 2003, 9:30 PM MDT
In force
65 min
Issued by
the Storm Prediction Center

Counties Bennett County, SD, Buffalo County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Mellette County, SD, Potter County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.4 hours before the alert went out and 178 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 00:00Z on 2003-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2003-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -180 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1840 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-180 m²/s²
0-3 km storm-relative helicity
-127 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.

807 
ACUS11 KWNS 040225
SWOMCD
SPC MCD 040225 
SDZ000-040330-

MESOSCALE DISCUSSION 0718
NWS STORM PREDICTION CENTER NORMAN OK
0925 PM CDT SAT MAY 03 2003

AREAS AFFECTED...CENTRAL SD

CONCERNING...SEVERE THUNDERSTORM WATCH 226...

VALID 040225Z - 040330Z

SEVERE THREAT WILL CONTINUE TO DIMINISH OVER CENTRAL SD DURING THE
NEXT FEW HOURS...WITH LOCALIZED HEAVY RAIN BEING THE PRIMARY CONCERN
FROM CENTRAL INTO NERN SD.

02Z SURFACE ANALYSIS SHOWS A FRONTAL BOUNDARY EXTENDING FROM SWRN SD
IN THE VICINITY OF SHANNON COUNTY NEWD TO SULLY COUNTY AND THEN
ENEWD TO ROBERTS/GRANT COUNTIES.  ALTHOUGH CONVECTION IS EXPECTED TO
CONTINUE FOR THE NEXT SEVERAL HOURS AS THE NOSE OF A STRENGTHENING
LLJ FROM THE SRN PLAINS INTO THE SD INTERSECTS THE SURFACE BOUNDARY
OVER CENTRAL SD...DECREASING INSTABILITY WILL DECREASE THE OVERALL
SEVERE THREAT.	MODEST DEEP LAYER SHEAR AND STEEP LAPSE RATES
WILL...HOWEVER...SUPPORT AN ISOLATED HAIL THREAT.

..PETERS.. 05/04/2003

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

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

43030188 44520064 45890168 45859822 43059966

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 4, 8:48 AM MDTMesoscale DiscussionSPCClay, Lincoln, Minnehaha, Turner, Union, Yankton117 min

Nearby

Mesoscale Discussions in South Dakota, 2003Every mesoscale discussion in 2003

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.