Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 147

March 25, 201523 counties in Arkansas; 8 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2015, 11:39 PM CDT for 23 counties in Arkansas; 8 counties in Oklahoma; 6 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Mar 25, 2015, 11:39 PM CDT (04:39 UTC)
Expired: Mar 26, 2015, 1:15 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 37 counties

Cleburne County, AR, Conway County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Independence County, AR, Johnson County, AR, Logan County, AR, Lonoke County, AR, Montgomery County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Yell County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Lamar County, TX, Wise County, TX

The radar

The Western Arkansas radar (KSRX), 106 km from the middle of the area, began a volume at 04:40 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

Shreveport, LA (KBAD), launched 00:00Z, 4.7 hours before the alert went out and 242 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 77 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 1921 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 124 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.

Issued	Product	Office	Counties	Lasted
Mar 25, 7:02 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Randolph	7 hr
Mar 25, 7:54 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 19 more	66 min
Mar 25, 9:21 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 33 more	8 hr
Mar 25, 9:23 PM CDT	Mesoscale Discussion	SPC	Clay, Greene	97 min
Mar 26, 1:35 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene	25 min
Mar 26, 2:17 AM CDT	Mesoscale Discussion	SPC	Clark, Garland, Grant, Hempstead, Hot Spring, Howard and 8 more	58 min
Mar 26, 12:30 PM CDT	Mesoscale Discussion	SPC	Cameron, Hidalgo, Willacy	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Oklahoma, 2015 Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.