Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 698

May 19, 201332 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 19, 2013, 1:45 PM CDT for 32 counties in Oklahoma. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 19, 2013, 1:45 PM CDT (18:45 UTC)
Expired: May 19, 2013, 2:45 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 32 counties

Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Johnston County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 28 km from the middle of the area, began a volume at 18:46 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 182May 19, 2:15 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.8 hours before the alert went out and 41 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: 2137 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 490 m²/s²
0-3 km storm-relative helicity: 490 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 18, 9:03 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 33 more	57 min
May 18, 10:44 PM CDT	Mesoscale Discussion	SPC	Cleveland, Creek, Garvin, Grady, Hughes, Lincoln and 14 more	31 min
May 18, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Cleveland, Coal, Comanche, Cotton, Craig and 24 more	4 hr
May 19, 5:25 AM CDT	Mesoscale Discussion	SPC	Craig, Nowata, Washington	2 hr
May 19, 12:51 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Grant, Kay, Nowata, Washington	114 min
May 19, 2:14 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Caddo, Canadian, Carter and 50 more	9 hr
May 19, 3:27 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Ellis, Harper, Woods, Woodward	63 min
May 19, 4:37 PM CDT	Mesoscale Discussion	SPC	Cleveland, Lincoln, Oklahoma, Pottawatomie	53 min
May 19, 5:08 PM CDT	Mesoscale Discussion	SPC	Cleveland, Creek, Lincoln, Oklahoma, Pottawatomie	37 min
May 19, 6:27 PM CDT	Mesoscale Discussion	SPC	Creek, Kay, Lincoln, Noble, Okfuskee, Oklahoma and 5 more	63 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.