Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 674

May 16, 201522 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 16, 2015, 7:30 PM CDT for 22 counties in Oklahoma. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 16, 2015, 7:30 PM CDT (00:30 UTC)
Expired
May 16, 2015, 9:00 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 22 counties

Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell 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, Ottawa County, OK, Pawnee 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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.5 hours before the alert went out and 165 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2015-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1999 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2015-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 331 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
May 16, 7:14 PM CDTMesoscale DiscussionSPCCaddo, Carter, Cleveland, Comanche, Cotton, Garvin and 13 more91 min
May 16, 8:42 PM CDTTornado WatchSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 27 more8 hr
May 16, 8:47 PM CDTMesoscale DiscussionSPCCanadian, Carter, Cleveland, Coal, Cotton, Garvin and 18 more88 min
May 16, 11:34 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cherokee, Coal, Craig and 23 more86 min

Nearby

Mesoscale Discussions in Oklahoma, 2015Every 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.