Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 685

May 17, 201516 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at May 17, 2015, 6:25 AM CDT for 16 counties in Arkansas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
May 17, 2015, 6:25 AM CDT (11:25 UTC)
Expired
May 17, 2015, 7:30 AM CDT
In force
65 min
Issued by
the Storm Prediction Center

Counties Baxter County, AR, Boone County, AR, Cleburne County, AR, Conway County, AR, Fulton County, AR, Independence County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 11.4 hours before the alert went out and 175 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 2015-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1727 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 2015-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 127 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
1727 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1056 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
127 m²/s²
0-3 km storm-relative helicity
218 m²/s²
Significant tornado parameter
1.4
Supercell composite
11.8

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 16, 8:42 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
May 17, 1:43 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Cleburne, Conway, Crawford and 18 more92 min
May 17, 2:06 AM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Cleburne, Conway, Fulton, Independence and 10 more5 hr
May 17, 4:27 AM CDTMesoscale DiscussionSPCBaxter, Cleburne, Conway, Faulkner, Fulton, Independence and 11 more93 min

Nearby

Mesoscale Discussions in Arkansas, 2015Every 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.