Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 850

May 22, 201132 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 11:15 AM CDT for 32 counties in Arkansas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 22, 2011, 11:15 AM CDT (16:15 UTC)
Expired
May 22, 2011, 12:45 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 32 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Yell County, AR

The radar

The Little Rock radar (KLZK), 61 km from the middle of the area, began a volume at 16:17 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

Little Rock, AR (KLZK), launched 12:00Z, 4.3 hours before the alert went out and 249 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, Little Rock, AR at 12:00Z on 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1953 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, Little Rock, AR at 12:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
1953 J/kg
Mixed-layer CIN
-164 J/kg
Mixed-layer LCL
768 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.3
Supercell composite
5.2

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
May 21, 8:31 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 45 more89 min
May 22, 5:18 AM CDTMesoscale DiscussionSPCArkansas, Calhoun, Clark, Cleburne, Cleveland, Conway and 32 more57 min
May 22, 7:03 AM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 30 more7 hr
May 22, 1:06 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Fulton, Marion114 min
May 22, 1:09 PM CDTMesoscale DiscussionSPCArkansas, Crittenden, Cross, Grant, Jefferson, Lee and 7 more66 min
May 22, 1:27 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
May 22, 3:10 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Independence, Izard, Jackson and 9 more65 min
May 22, 3:24 PM CDTTornado WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 22 more6 hr
May 22, 3:48 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Madison, Washington117 min
May 22, 5:21 PM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Cleburne, Conway and 22 more54 min
May 22, 6:10 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Madison, Washington65 min

Nearby

Mesoscale Discussions in Arkansas, 2011Every mesoscale discussion in 2011

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.