Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 551

May 8, 201521 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 8, 2015, 5:24 PM CDT for 21 counties in Oklahoma. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 8, 2015, 5:24 PM CDT (22:24 UTC)
Expired: May 8, 2015, 7:00 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 21 counties

Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Pittsburg County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 146May 8, 7:25 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.4 hours before the alert went out and 173 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: 171 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 7, 8:49 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Pushmataha	86 min
May 7, 11:05 PM CDT	Mesoscale Discussion	SPC	Choctaw, McCurtain, Pushmataha	85 min
May 8, 12:22 PM CDT	Mesoscale Discussion	SPC	Caddo, Comanche, Cotton, Greer, Harmon, Jackson and 4 more	83 min
May 8, 12:51 PM CDT	Tornado Watch	SPC	Beckham, Caddo, Canadian, Carter, Cleveland, Comanche and 22 more	8 hr
May 8, 2:12 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cleveland, Coal, Comanche and 22 more	93 min
May 8, 3:45 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 11 more	90 min
May 8, 6:50 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 7 more	85 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.