Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 679

May 16, 201529 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 16, 2015, 11:34 PM CDT for 29 counties in Oklahoma. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 16, 2015, 11:34 PM CDT (04:34 UTC)
Expired: May 17, 2015, 1:00 AM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 29 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 04:51 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, 4.6 hours before the alert went out and 103 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: 1999 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 392 m²/s²
Significant tornado parameter: 5.6
Supercell composite: 32.8

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 16, 7:14 PM CDT	Mesoscale Discussion	SPC	Caddo, Carter, Cleveland, Comanche, Cotton, Garvin and 13 more	91 min
May 16, 7:30 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, Haskell and 16 more	90 min
May 16, 8:42 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 27 more	8 hr
May 16, 8:47 PM CDT	Mesoscale Discussion	SPC	Canadian, Carter, Cleveland, Coal, Cotton, Garvin and 18 more	88 min

Nearby

Mesoscale Discussions in Oklahoma, 2015 Every mesoscale discussion in 2015

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.