Alert archive / Arkansas / Mesoscale Discussions in 2021
Mesoscale Discussion 519
The Storm Prediction Center issued this mesoscale discussion at May 4, 2021, 2:02 AM CDT for 22 counties in Arkansas; Butler County, Carter County, Ripley County, Missouri. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- May 4, 2021, 2:02 AM CDT (07:02 UTC)
- Expired
- May 4, 2021, 3:30 AM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 137
All 25 counties
Clay County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lonoke County, AR, Monroe County, AR, Perry County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, White County, AR, Woodruff County, AR, Butler County, MO, Carter County, MO, Ripley County, MO
The radar
The Little Rock radar (KLZK), 95 km from the middle of the area, began a volume at 07:04 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
Little Rock, AR (KLZK), launched 00:00Z, 7.0 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.
- Mixed-layer CAPE
- 3608 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1081 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 2.3
- Supercell composite
- 15.3
The text
As transmitted.
487
ACUS11 KWNS 040702
SWOMCD
SPC MCD 040702
MOZ000-ARZ000-040830-
Mesoscale Discussion 0519
NWS Storm Prediction Center Norman OK
0202 AM CDT Tue May 04 2021
Areas affected...central and northeastern Arkansas and into
southeastern Missouri
Concerning...Severe Thunderstorm Watch 137...
Valid 040702Z - 040830Z
The severe weather threat for Severe Thunderstorm Watch 137
continues.
SUMMARY...Strong/locally severe storms continue to advance across
northeastern and central Arkansas, where damaging winds continue to
pose severe risk.
DISCUSSION...Latest radar loop continues to show a fairly
well-organized bowing cluster of storms moving across northeastern
Arkansas and adjacent southeastern Missouri, with vigorous storms
developing eastward toward the Mississippi Valley just ahead of the
bow in a wing of warm advection.
Meanwhile, a second/organized cluster of storms is ongoing just to
the southwest, which will move northeastward across central Arkansas
at around 45 kt over the next 1 to 2 hours. These storms are most
intense in the vicinity of a west-to-east outflow boundary laid out
by the bowing cluster to the north, that has sagged southward into
the Little Rock area. A 62 kt gust has recently been reported near
Hot Springs with this cluster, and expect strong/possibly damaging
winds will affect the Little Rock metro area beginning within the
next half hour or so.
..Goss.. 05/04/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PAH...MEG...LZK...SGF...
LAT...LON 37079136 35899136 35449173 35189318 34069319 34109245
34579099 36859018 37079136SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 8:38 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Boone, Calhoun, Carroll, Clark and 60 more | 2 hr |
| May 3, 9:10 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Calhoun, Carroll, Clark and 50 more | 7 hr |
| May 3, 10:22 PM CDT | Mesoscale Discussion | SPC | Boone, Crawford, Franklin, Johnson, Madison, Marion and 2 more | 83 min |
| May 3, 11:34 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clark, Cleburne, Conway and 27 more | 86 min |
| May 4, 1:06 AM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Jackson and 5 more | 114 min |
| May 4, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 2 more | 6 hr |
| May 4, 4:17 AM CDT | Mesoscale Discussion | SPC | Crittenden | 88 min |
| May 4, 6:44 AM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 8 more | 2 hr |
| May 4, 10:52 AM CDT | Tornado Watch | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 2 more | 7 hr |
| May 4, 11:58 AM CDT | Mesoscale Discussion | SPC | Crittenden, Lee, Phillips | 2 hr |
| May 4, 12:18 PM CDT | Severe Thunderstorm Watch | SPC | Phillips | 5 hr |
| May 4, 1:59 PM CDT | Mesoscale Discussion | SPC | Cleburne, Conway, Craighead, Cross, Faulkner, Greene and 17 more | 2 hr |
Nearby
Mesoscale Discussions in Arkansas, 2021Mesoscale Discussions in Missouri, 2021Every mesoscale discussion in 2021
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.