Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 891

May 28, 2017Howard County, Montgomery County, Polk County, Arkansas; McCurtain County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 28, 2017, 12:52 AM CDT for Howard County, Montgomery County, Polk County, Arkansas; McCurtain County, Oklahoma. It was in force for 23 min.

The area

The outline as issued.

The facts

Issued
May 28, 2017, 12:52 AM CDT (05:52 UTC)
Expired
May 28, 2017, 1:15 AM CDT
In force
23 min
Issued by
the Storm Prediction Center

Counties Howard County, AR, Montgomery County, AR, Polk County, AR, McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 101 km from the middle of the area, began a volume at 05:53 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, 5.9 hours before the alert went out and 226 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, Shreveport, LA at 00:00Z on 2017-05-28Temperature 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, Shreveport, LA at 00:00Z on 2017-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.193958Sfc1 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
0 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 27, 7:01 PM CDTTornado WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more6 hr
May 27, 9:26 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Independence and 8 more94 min
May 27, 9:59 PM CDTTornado WatchSPCCrittenden, Cross, Lee, St. Francis2 hr
May 27, 11:47 PM CDTMesoscale DiscussionSPCCrawford, Sebastian, Washington58 min
May 28, 12:06 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Columbia, Crawford, Franklin, Hempstead and 10 more5 hr
May 28, 12:18 AM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 36 more6 hr
May 28, 2:11 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleveland, Dallas, Desha, Faulkner and 12 more2 hr
May 28, 2:53 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 6 more2 hr
May 28, 4:59 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 9 more2 hr
May 27, 7:12 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas2 hr
May 27, 8:07 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Coal and 33 more83 min
May 27, 9:07 PM CDTMesoscale DiscussionSPCBeaver, Dewey, Ellis, Harper, Roger Mills, Woodward53 min
May 27, 9:39 PM CDTSevere Thunderstorm WatchSPCBeckham, Blaine, Custer, Dewey, Ellis, Garfield and 9 more4 hr
May 27, 10:43 PM CDTMesoscale DiscussionSPCKingfisher, Major, Woodward32 min

Nearby

Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Oklahoma, 2017Every mesoscale discussion in 2017

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.