Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1719

July 8, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 4:38 PM MDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jul 8, 2003, 4:38 PM MDT (22:38 UTC)
Expired
Jul 8, 2003, 5:45 PM MDT
In force
67 min
Issued by
the Storm Prediction Center
All 21 counties

Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.6 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-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 2003-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 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, Rapid City, SD at 12:00Z on 2003-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
94 J/kg
Mixed-layer CIN
-475 J/kg
Mixed-layer LCL
1190 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
84 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 10:53 AM MDTMesoscale DiscussionSPCCuster, Fergus, Garfield, Golden Valley, Judith Basin, McCone and 10 more2 hr
Jul 8, 12:00 PM MDTSevere Thunderstorm WatchSPCBig Horn, Blaine, Carbon, Fergus, Garfield, Golden Valley and 7 more6 hr
Jul 8, 1:36 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River84 min
Jul 8, 2:05 PM MDTTornado WatchSPCCarter, Custer, Fallon, Powder River7 hr
Jul 8, 2:33 PM MDTMesoscale DiscussionSPCBig Horn, Blaine, Carbon, Fergus, Garfield, Golden Valley and 7 more57 min
Jul 8, 5:46 PM MDTMesoscale DiscussionSPCBlaine, Daniels, Dawson, Garfield, McCone, Petroleum and 9 more59 min
Jul 7, 9:15 PM MDTMesoscale DiscussionSPCBon Homme, Clay, Union3 hr
Jul 7, 9:20 PM MDTSevere Thunderstorm WatchSPCBon Homme, Clay, Union7 hr
Jul 7, 10:25 PM MDTMesoscale DiscussionSPCAurora, Bon Homme, Brule, Charles Mix, Davison, Douglas and 8 more2 hr
Jul 7, 10:40 PM MDTSevere Thunderstorm WatchSPCAurora, Beadle, Bon Homme, Brookings, Brule, Buffalo and 18 more5 hr
Jul 8, 12:34 AM MDTMesoscale DiscussionSPCUnion116 min
Jul 8, 1:52 AM MDTMesoscale DiscussionSPCAurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 13 more113 min
Jul 8, 9:44 AM MDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Clark and 28 more91 min

Nearby

Mesoscale Discussions in South Dakota, 2003Mesoscale Discussions in Wyoming, 2003Mesoscale Discussions in Montana, 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.