Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 583

April 7, 20085 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2008, 11:05 PM CDT for 5 counties in Oklahoma. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2008, 11:05 PM CDT (04:05 UTC)
Expired: Apr 8, 2008, 12:30 AM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Creek County, OK, Lincoln County, OK, Pawnee County, OK, Payne County, OK, Tulsa County, OK

The radar

The Norman radar (KTLX), 93 km from the middle of the area, began a volume at 04:06 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.

Tornado Watch 172Apr 8, 2:55 AM CDT

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 4.1 hours before the alert went out and 97 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1617 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 425 m²/s²
0-3 km storm-relative helicity: 835 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 7, 7:28 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Canadian, Cherokee, Craig, Creek, Custer and 23 more	8 hr
Apr 7, 9:12 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 42 more	63 min
Apr 8, 2:34 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, Lincoln and 16 more	56 min
Apr 8, 2:52 AM CDT	Tornado Watch	SPC	Adair, Cherokee, Craig, Creek, Delaware, Haskell and 22 more	6 hr
Apr 8, 4:57 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more	63 min
Apr 8, 2:30 PM CDT	Mesoscale Discussion	SPC	McCurtain	60 min
Apr 8, 2:52 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2008 Every mesoscale discussion in 2008

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.