Alert archive / South Dakota / Tornado Warnings in 2003

Tornado Warning 29, NWS Aberdeen, SD

July 20, 2003Marshall County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 20, 2003, 3:34 AM CDT for Marshall County, South Dakota. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 20, 2003, 3:34 AM CDT (08:34 UTC)
Expired
Jul 20, 2003, 4:15 AM CDT
In force
41 min
Issued by
NWS Aberdeen, SD
Area
Counties, with a storm outline in the text

County Marshall County, SD

The radar

The Aberdeen radar (KABR), 61 km from the middle of the area, began a volume at 08:37 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 20, 1:15 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 8.6 hours before the alert went out and 106 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 2003-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2126 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 2003-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
2126 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
2042 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

221 
WFUS53 KABR 200834
TORABR
SDC091-200915-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
333 AM CDT SUN JUL 20 2003

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* TORNADO WARNING FOR...
  MARSHALL COUNTY IN NORTHEAST SOUTH DAKOTA

* UNTIL 415 AM CDT

* AT 333 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES
  NORTHEAST OF AMHERST...OR ABOUT 5 MILES WEST OF BRITTON...MOVING
  SOUTHEAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  BRITTON THROUGH 345 AM CDT
  FORT SISSETON STATE PARK AROUND 355 AM CDT

THIS WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY
ISSUED FOR THE WARNED AREA.

THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING
SITUATION. IF YOU ARE IN THE PATH OF THIS TORNADO TAKE SHELTER NOW

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
ABERDEEN.

LAT...LON 4583 9770 4578 9795 4561 9791 4560 9744

$$
MARSILI

The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 19, 7:02 PM CDTSevere Thunderstorm WarningABRDewey, Walworth43 min
Jul 20, 1:06 AM CDTSevere Thunderstorm WarningABRSpink39 min
Jul 20, 1:15 AM CDTSevere Thunderstorm WarningABRClark45 min
Jul 20, 1:22 AM CDTSevere Thunderstorm WarningABRFaulk38 min
Jul 20, 1:41 AM CDTSevere Thunderstorm WarningABRSpink49 min
Jul 20, 1:55 AM CDTSevere Thunderstorm WarningABRClark50 min
Jul 20, 2:02 AM CDTSevere Thunderstorm WarningABRCodington, Hamlin58 min
Jul 20, 2:09 AM CDTSevere Thunderstorm WarningABRDay51 min
Jul 20, 2:36 AM CDTSevere Thunderstorm WarningABRGrant54 min
Jul 20, 3:12 AM CDTSevere Thunderstorm WarningABRMarshall63 min
Jul 20, 3:22 AM CDTSevere Thunderstorm WarningABRRoberts38 min
Jul 20, 3:34 AM CDTSevere Thunderstorm WarningABRGrant26 min
Jul 20, 4:02 AM CDTSevere Thunderstorm WarningABRDay58 min
Jul 20, 4:04 AM CDTSevere Thunderstorm WarningABRMarshall26 min
Jul 20, 4:23 AM CDTSevere Thunderstorm WarningABRRoberts52 min
Jul 20, 4:32 AM CDTSevere Thunderstorm WarningABRMarshall58 min
Jul 20, 4:47 AM CDTSevere Thunderstorm WarningABRGrant43 min
Jul 20, 5:09 AM CDTSevere Thunderstorm WarningABRBrown21 min
Jul 20, 5:20 AM CDTSevere Thunderstorm WarningABRRoberts40 min
Jul 20, 5:31 AM CDTSevere Thunderstorm WarningABRMarshall44 min
Jul 20, 6:30 AM CDTSevere Thunderstorm WarningABRMarshall15 min
Jul 20, 6:42 AM CDTSevere Thunderstorm WarningABRRoberts33 min

Nearby

Tornado Warnings in South Dakota, 2003Every tornado warning in 2003Tornadoes 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; radar from the NEXRAD Level II archive.