Alert archive / Oklahoma / Mesoscale Discussions in 2019
Mesoscale Discussion 489
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2019, 9:41 PM CDT for 13 counties in Arkansas; 14 counties in Oklahoma; Fannin County, Grayson County, Texas. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2019, 9:41 PM CDT (02:41 UTC)
- Expired
- Apr 30, 2019, 11:15 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 29 counties
Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Fannin County, TX, Grayson County, TX
The radar
The Western Arkansas radar (KSRX), 118 km from the middle of the area, began a volume at 02:44 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 2.7 hours before the alert went out and 183 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
- 65 J/kg
- Mixed-layer CIN
- -282 J/kg
- Mixed-layer LCL
- 862 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 |
|---|---|---|---|---|
| Apr 30, 10:58 PM CDT | Tornado Watch | SPC | Baxter, Boone, Carroll, Crawford, Franklin, Johnson and 10 more | 4 hr |
| May 1, 1:35 AM CDT | Mesoscale Discussion | SPC | Conway, Johnson, Perry, Pope, Searcy, Stone and 2 more | 55 min |
| May 1, 12:00 AM CDT | Mesoscale Discussion | SPC | Caddo, Carter, Cleveland, Comanche, Cotton, Garvin and 8 more | 2 hr |
| May 1, 12:21 PM CDT | Mesoscale Discussion | SPC | Caddo, Carter, Cleveland, Comanche, Cotton, Garvin and 15 more | 114 min |
| May 1, 1:00 PM CDT | Severe Thunderstorm Watch | SPC | Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 11 more | 9 hr |
| May 1, 3:25 PM CDT | Mesoscale Discussion | SPC | Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 11 more | 2 hr |
| May 1, 4:49 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Johnston, Latimer and 4 more | 116 min |
| May 1, 5:29 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Choctaw, Coal, Hughes, Latimer and 4 more | 8 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2019Mesoscale Discussions in Arkansas, 2019Mesoscale Discussions in Texas, 2019Every mesoscale discussion in 2019
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.