Alert archive / Arkansas / Mesoscale Discussions in 2009

Mesoscale Discussion 663

May 1, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 1, 2009, 9:36 PM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
May 1, 2009, 9:36 PM CDT (02:36 UTC)
Expired
May 1, 2009, 11:00 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 75 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, McDonald County, MO, Ozark County, MO, Taney County, MO, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK, Fannin County, TX, Lamar County, TX

The radar

The Western Arkansas radar (KSRX), 22 km from the middle of the area, began a volume at 02:36 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, 2.6 hours before the alert went out and 208 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 2009-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 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, Springfield, MO at 00:00Z on 2009-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 146 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
8 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
445 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
146 m²/s²
0-3 km storm-relative helicity
321 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
May 1, 9:56 PM CDTSevere Thunderstorm WatchSPCArkansas, Clark, Cleburne, Conway, Crawford, Faulkner and 27 more6 hr
May 2, 1:45 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleburne, Cleveland, Conway, Crittenden and 34 more90 min
May 2, 9:23 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 26 more97 min
May 2, 12:17 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more7 hr
May 2, 3:47 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Columbia, Drew, Lafayette and 5 more58 min
May 2, 5:25 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Columbia, Drew, Lafayette and 4 more95 min
May 2, 6:03 PM CDTTornado WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Desha and 10 more6 hr
May 1, 7:19 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Comanche and 16 more86 min
May 2, 2:58 AM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 34 more3 hr
May 2, 6:50 AM CDTMesoscale DiscussionSPCAtoka, Coal, Haskell, Hughes, Johnston, Latimer and 10 more3 hr
May 2, 1:24 PM CDTMesoscale DiscussionSPCBell, Blanco, Bosque, Burnet, Collin, Coryell and 31 more66 min
May 2, 1:56 PM CDTTornado WatchSPCBell, Bosque, Coryell, Dallas, Ellis, Falls and 18 more4 hr
May 2, 3:04 PM CDTMesoscale DiscussionSPCAnderson, Camp, Cherokee, Gregg, Harrison, Houston and 10 more26 min
May 2, 5:10 PM CDTMesoscale DiscussionSPCHarrison, Panola, Rusk65 min
May 2, 6:49 PM CDTMesoscale DiscussionSPCCamp, Cass, Franklin, Hopkins, Hunt, Kaufman and 7 more86 min

Nearby

Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Missouri, 2009Every mesoscale discussion in 2009

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.