Alert archive / Montana / Mesoscale Discussions in 2004

Mesoscale Discussion 1845

August 2, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2004, 8:07 PM MDT for 4 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2004, 8:07 PM MDT (02:07 UTC)
Expired
Aug 2, 2004, 9:00 PM MDT
In force
53 min
Issued by
the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Crook County, WY

The radar

The Rapid City radar (KUDX), 215 km from the middle of the area, began a volume at 02:08 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

Rapid City, SD (KUNR), launched 00:00Z, 2.1 hours before the alert went out and 216 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 2004-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 603 joules per kilogram.LCLEL10008507005003002001001 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 2004-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
603 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
2685 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
160 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

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
Aug 3, 1:53 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River, Prairie, Wibaux2 hr
Aug 2, 6:47 PM MDTMesoscale DiscussionSPCAurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 19 more58 min
Aug 3, 1:02 AM MDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 17 more118 min
Aug 3, 1:30 AM MDTMesoscale DiscussionSPCHaakon, Hughes, Jones, Meade, Stanley, Ziebach2 hr
Aug 3, 2:00 AM MDTSevere Thunderstorm WatchSPCBuffalo, Haakon, Hughes, Hyde, Jones, Lyman and 4 more5 hr
Aug 3, 4:04 AM MDTMesoscale DiscussionSPCBuffalo, Haakon, Hughes, Hyde, Jones, Lyman and 2 more116 min
Aug 3, 6:21 AM MDTMesoscale DiscussionSPCAurora, Beadle, Brule, Buffalo, Davison, Douglas and 17 more54 min
Aug 3, 7:00 AM MDTSevere Thunderstorm WatchSPCAurora, Beadle, Brule, Buffalo, Davison, Douglas and 14 more5 hr
Aug 3, 9:48 AM MDTMesoscale DiscussionSPCLincoln, Minnehaha, Moody, Turner87 min

Nearby

Mesoscale Discussions in Montana, 2004Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in North 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.