Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 365

March 29, 201715 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2017, 1:21 AM CDT for 15 counties in Oklahoma. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Mar 29, 2017, 1:21 AM CDT (06:21 UTC)
Expired: Mar 29, 2017, 2:45 AM CDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Atoka County, OK, Carter County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 06:20 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, 6.4 hours before the alert went out and 91 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: 307 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 763 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 287 m²/s²
0-3 km storm-relative helicity: 385 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 6.7

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.

Issued	Product	Office	Counties	Lasted
Mar 28, 7:58 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 20 more	92 min
Mar 28, 10:21 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Cleveland, Coal, Comanche, Cotton, Creek and 19 more	7 hr
Mar 28, 10:25 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cherokee, Cleveland, Coal and 32 more	65 min
Mar 29, 2:54 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, McCurtain, Marshall, Pushmataha	96 min
Mar 29, 2:51 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 2 more	2 hr
Mar 29, 4:17 PM CDT	Tornado Watch	SPC	Adair, LeFlore, McCurtain, Sequoyah	8 hr
Mar 29, 6:08 PM CDT	Mesoscale Discussion	SPC	Craig, Ottawa	97 min

Nearby

Mesoscale Discussions in Oklahoma, 2017 Every 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.