Alert archive / Oklahoma / Mesoscale Discussions in 2019
Mesoscale Discussion 477
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2019, 11:41 AM CDT for 47 counties in Oklahoma. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2019, 11:41 AM CDT (16:41 UTC)
- Expired
- Apr 30, 2019, 1:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 47 counties
Adair County, OK, Atoka County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Norman radar (KTLX), 74 km from the middle of the area, began a volume at 16:40 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 12:00Z, 4.7 hours before the alert went out and 86 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
- 1242 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 541 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.7
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, 12:02 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Caddo, Carter, Cherokee and 45 more | 13 hr |
| Apr 30, 2:56 PM CDT | Mesoscale Discussion | SPC | Caddo, Comanche, Grady, Oklahoma, Tillman | 2 hr |
| Apr 30, 3:26 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Delaware, McIntosh, Mayes and 4 more | 2 hr |
| Apr 30, 5:21 PM CDT | Mesoscale Discussion | SPC | Carter, Cleveland, Coal, Cotton, Creek, Garvin and 15 more | 84 min |
| Apr 30, 6:00 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Delaware, LeFlore, Mayes and 5 more | 90 min |
Nearby
Mesoscale Discussions in Oklahoma, 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.