Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 892

May 30, 201312 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 30, 2013, 9:03 PM CDT for 12 counties in Oklahoma. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 30, 2013, 9:03 PM CDT (02:03 UTC)
Expired: May 30, 2013, 10:00 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Carter County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Johnston County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Okmulgee County, OK, Pontotoc County, OK, Rogers County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 99 km from the middle of the area, began a volume at 02:03 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, 2.1 hours before the alert went out and 108 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: 854 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 1286 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.3

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
May 30, 8:09 PM CDT	Mesoscale Discussion	SPC	Adair, Sequoyah	66 min
May 30, 8:46 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Delaware, Haskell, LeFlore, Sequoyah	7 hr
May 30, 11:28 PM CDT	Mesoscale Discussion	SPC	Adair, LeFlore, Sequoyah	2 hr
May 31, 1:57 AM CDT	Mesoscale Discussion	SPC	LeFlore	93 min
May 31, 1:49 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Nowata, Ottawa	116 min
May 31, 2:40 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 29 more	95 min
May 31, 3:27 PM CDT	Tornado Watch PDS	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 36 more	9 hr
May 31, 4:58 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cleveland, Coal, Comanche and 29 more	92 min
May 31, 6:33 PM CDT	Mesoscale Discussion	SPC	Canadian, Cleveland, Kingfisher, Logan, Noble, Oklahoma and 3 more	27 min

Nearby

Mesoscale Discussions in Oklahoma, 2013 Every mesoscale discussion in 2013

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.