Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 560

April 26, 201326 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2013, 10:23 PM CDT for 26 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 26, 2013, 10:23 PM CDT (03:23 UTC)
Expired: Apr 27, 2013, 12:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 26 counties

Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McCurtain County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 157 km from the middle of the area, began a volume at 03:24 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, 3.4 hours before the alert went out and 159 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: 13 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 805 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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
Apr 26, 7:59 PM CDT	Mesoscale Discussion	SPC	Atoka, Caddo, Canadian, Cleveland, Coal, Garvin and 16 more	2 hr
Apr 26, 9:30 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 23 more	6 hr
Apr 27, 12:57 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 10 more	2 hr
Apr 27, 2:50 AM CDT	Mesoscale Discussion	SPC	Choctaw, McCurtain	25 min

Nearby

Mesoscale Discussions in Oklahoma, 2013 Every mesoscale discussion in 2013

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.