Alert archive / Arkansas / Mesoscale Discussions in 2018
Mesoscale Discussion 1097
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2018, 9:25 AM CDT for 19 counties in Arkansas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2018, 9:25 AM CDT (14:25 UTC)
- Expired
- Jul 20, 2018, 11:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Arkansas County, AR, Cleburne County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Lee County, AR, Lonoke County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, St. Francis County, AR, Stone County, AR, White County, AR, Woodruff County, AR
The radar
The Little Rock radar (KLZK), 91 km from the middle of the area, began a volume at 14:27 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
Springfield, MO (KSGF), launched 12:00Z, 2.4 hours before the alert went out and 306 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.
- Mixed-layer CAPE
- 1151 J/kg
- Mixed-layer CIN
- -259 J/kg
- Mixed-layer LCL
- 1847 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 197 m²/s²
- 0-3 km storm-relative helicity
- 203 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 7:07 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Carroll, Cleburne, Fulton, Independence and 10 more | 3 hr |
| Jul 19, 8:02 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Clark, Cleburne, Cleveland, Conway and 40 more | 118 min |
| Jul 19, 8:54 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleveland and 35 more | 114 min |
| Jul 19, 11:21 PM CDT | Mesoscale Discussion | SPC | Chicot, Desha, Phillips | 114 min |
| Jul 20, 12:58 PM CDT | Mesoscale Discussion | SPC | Clay | 62 min |
| Jul 20, 3:46 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Fulton, Izard, Marion, Randolph and 2 more | 59 min |
| Jul 20, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Clay, Craighead, Cross, Fulton, Greene and 8 more | 6 hr |
| Jul 20, 5:54 PM CDT | Mesoscale Discussion | SPC | Crittenden, Lee, Phillips, St. Francis | 3 hr |
| Jul 20, 6:22 PM CDT | Tornado Watch | SPC | Crittenden, Lee, Mississippi, Phillips, St. Francis | 8 hr |
Nearby
Mesoscale Discussions in Arkansas, 2018Every mesoscale discussion in 2018
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.