Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 190

February 19, 201712 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Feb 19, 2017, 5:12 PM CST for 12 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Feb 19, 2017, 5:12 PM CST (23:12 UTC)
Expired
Feb 19, 2017, 7:45 PM CST
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Garfield County, OK, Grady County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, McClain County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 92 km from the middle of the area, began a volume at 23:12 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 12:00Z, 11.2 hours before the alert went out and 94 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 12:00Z on 2017-02-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2017-02-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1164 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 19, 2:00 PM CSTMesoscale DiscussionSPCCarter, Comanche, Cotton, Jefferson, Love, Stephens and 1 more3 hr
Feb 19, 4:07 PM CSTSevere Thunderstorm WatchSPCCarter, Comanche, Cotton, Jefferson, Love, Stephens and 1 more7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017Every mesoscale discussion in 2017

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.