Alert archive / Oklahoma / Mesoscale Discussions in 2009
Mesoscale Discussion 291
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2009, 6:50 AM CDT for 20 counties in Oklahoma. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2009, 6:50 AM CDT (11:50 UTC)
- Expired
- Mar 27, 2009, 8:15 AM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
Counties Alfalfa County, OK, Blaine County, OK, Canadian County, OK, Creek County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Seminole County, OK, Woods County, OK
The radar
The Norman radar (KTLX), 62 km from the middle of the area, began a volume at 11:49 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
Norman, OK (KOUN), launched 00:00Z, 11.8 hours before the alert went out and 72 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
- 12 J/kg
- Mixed-layer CIN
- -270 J/kg
- Mixed-layer LCL
- 630 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 7:32 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 3 more | 4 hr |
| Mar 26, 9:28 PM CDT | Mesoscale Discussion | SPC | Choctaw, LeFlore, McCurtain, Pushmataha | 62 min |
| Mar 26, 11:34 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 4 hr |
| Mar 27, 2:55 AM CDT | Mesoscale Discussion | SPC | Beaver, Cimarron, Texas | 4 hr |
| Mar 27, 8:04 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Custer, Dewey, Ellis and 7 more | 4 hr |
| Mar 27, 12:30 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 19 more | 6 hr |
| Mar 27, 12:33 PM CDT | Mesoscale Discussion | SPC | Bryan, Choctaw, McCurtain | 57 min |
| Mar 27, 12:58 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, LeFlore, McCurtain, Marshall and 1 more | 7 hr |
| Mar 27, 3:34 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, McCurtain, Marshall, Pushmataha | 56 min |
Nearby
Mesoscale Discussions in Oklahoma, 2009Every mesoscale discussion in 2009
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.