Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 819

May 19, 20117 counties in Oklahoma; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2011, 7:47 PM CDT for 7 counties in Oklahoma; 5 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: May 19, 2011, 7:47 PM CDT (00:47 UTC)
Expired: May 19, 2011, 9:45 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, Kiowa County, OK, Tillman County, OK, Baylor County, TX, Haskell County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 10 km from the middle of the area, began a volume at 00:48 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 watches that followed

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

Severe Thunderstorm Watch 311May 19, 11:40 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.8 hours before the alert went out and 170 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: 2115 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 8.0

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 19, 11:39 PM CDT	Severe Thunderstorm Watch	SPC	Harmon, Jackson, Tillman	6 hr
May 20, 2:58 AM CDT	Mesoscale Discussion	SPC	Comanche, Jackson, Kiowa, Tillman, Washita	92 min
May 20, 9:11 AM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Ottawa	2 hr
May 20, 10:30 AM CDT	Mesoscale Discussion	SPC	Bryan, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more	60 min
May 20, 11:03 AM CDT	Tornado Watch	SPC	Adair, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more	7 hr
May 20, 1:28 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 3 more	62 min
May 20, 1:52 PM CDT	Mesoscale Discussion	SPC	Ellis, Harper, Woods, Woodward	113 min
May 20, 2:32 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Ellis, Garfield, Grant, Harper, Major and 2 more	7 hr
May 20, 4:00 PM CDT	Mesoscale Discussion	SPC	Choctaw, LeFlore, McCurtain, Pushmataha	60 min
May 20, 5:56 PM CDT	Tornado Watch	SPC	McCurtain	3 hr
May 20, 6:01 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Ellis, Garfield, Grant, Harper, Major and 2 more	59 min
May 19, 9:36 PM CDT	Mesoscale Discussion	SPC	Borden, Briscoe, Childress, Coke, Collingsworth, Cottle and 28 more	84 min
May 20, 12:08 PM CDT	Mesoscale Discussion	SPC	Anderson, Bandera, Bastrop, Bell, Blanco, Bosque and 56 more	67 min
May 20, 12:28 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 60 more	10 hr
May 20, 5:34 PM CDT	Mesoscale Discussion	SPC	Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 41 more	116 min

Nearby

Mesoscale Discussions in Oklahoma, 2011 Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.