Alert archive / Arkansas / Mesoscale Discussions in 2020

Mesoscale Discussion 1796

November 14, 202015 counties in Arkansas; Alexander County, Pulaski County, Illinois; 13 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Nov 14, 2020, 10:32 PM CST for 15 counties in Arkansas; Alexander County, Pulaski County, Illinois; 13 counties in Missouri. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Nov 14, 2020, 10:32 PM CST (04:32 UTC)
Expired
Nov 15, 2020, 12:30 AM CST
In force
118 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
40%
All 30 counties

Clay County, AR, Cleburne County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Alexander County, IL, Pulaski County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 4.5 hours before the alert went out and 184 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 00:00Z on 2020-11-15Temperature 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, Little Rock, AR at 00:00Z on 2020-11-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 441 square meters per square second.1939587897117136Sfc1 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
1173 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
441 m²/s²
0-3 km storm-relative helicity
487 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Nov 14, 7:34 PM CSTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Madison and 6 more86 min

Nearby

Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Missouri, 2020Mesoscale Discussions in Illinois, 2020Every mesoscale discussion in 2020

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.