Alert archive / Oklahoma / Mesoscale Discussions in 2005

Mesoscale Discussion 329

March 21, 200514 counties in Arkansas; 17 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2005, 10:12 PM CST for 14 counties in Arkansas; 17 counties in Oklahoma. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Mar 21, 2005, 10:12 PM CST (04:12 UTC)
Expired
Mar 21, 2005, 11:15 PM CST
In force
63 min
Issued by
the Storm Prediction Center
All 31 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Newton County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Ottawa County, OK, Pittsburg County, OK, Rogers County, OK, Sequoyah County, OK, Wagoner County, OK, Washington County, OK

The radar

The Western Arkansas radar (KSRX), 67 km from the middle of the area, began a volume at 04:11 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 watches that followed

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

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 4.2 hours before the alert went out and 119 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, Springfield, MO at 00:00Z on 2005-03-22Temperature 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, Springfield, MO at 00:00Z on 2005-03-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 295 square meters per square second.1939587897Sfc1 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
1104 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
295 m²/s²
0-3 km storm-relative helicity
558 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 21, 8:29 PM CSTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more91 min
Mar 21, 9:20 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more7 hr
Mar 21, 10:15 PM CSTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Logan, Madison and 5 more6 hr
Mar 21, 11:09 PM CSTMesoscale DiscussionSPCHempstead, Howard, Lafayette, Little River, Miller, Pike and 1 more96 min
Mar 21, 11:26 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more94 min
Mar 22, 1:45 AM CSTTornado WatchSPCAshley, Bradley, Chicot, Union6 hr
Mar 22, 2:20 AM CSTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Logan, Madison and 5 more85 min
Mar 22, 3:57 AM CSTMesoscale DiscussionSPCAshley, Bradley, Chicot, Union2 hr
Mar 22, 11:55 AM CSTMesoscale DiscussionSPCArkansas, Chicot, Cleburne, Conway, Crittenden, Cross and 20 more95 min
Mar 22, 12:55 PM CSTSevere Thunderstorm WatchSPCArkansas, Baxter, Boone, Chicot, Clay, Cleburne and 29 more7 hr
Mar 22, 2:39 PM CSTMesoscale DiscussionSPCBaxter, Cleburne, Craighead, Crittenden, Cross, Faulkner and 19 more96 min
Mar 22, 4:27 PM CSTMesoscale DiscussionSPCClay, Mississippi33 min
Mar 21, 6:59 PM CSTMesoscale DiscussionSPCAtoka, Cherokee, Coal, Creek, Haskell, Hughes and 20 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2005Mesoscale Discussions in Arkansas, 2005Every mesoscale discussion in 2005

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.