Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 1055

May 27, 20089 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 27, 2008, 2:45 AM CDT for 9 counties in Oklahoma. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 27, 2008, 2:45 AM CDT (07:45 UTC)
Expired: May 27, 2008, 3:45 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Cleveland County, OK, Garvin County, OK, Hughes County, OK, Lincoln County, OK, McClain County, OK, Okfuskee County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 37 km from the middle of the area, began a volume at 07:48 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.8 hours before the alert went out and 36 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: 2341 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1453 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 8.4

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 26, 7:45 PM CDT	Tornado Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Custer and 23 more	7 hr
May 26, 10:19 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 33 more	116 min
May 27, 1:15 AM CDT	Severe Thunderstorm Watch	SPC	Caddo, Canadian, Cleveland, Garvin, Grady, Lincoln and 5 more	5 hr
May 27, 5:23 AM CDT	Mesoscale Discussion	SPC	Atoka, Latimer, LeFlore, Pushmataha	67 min
May 27, 1:52 PM CDT	Mesoscale Discussion	SPC	Greer, Harmon, Jackson	2 hr
May 27, 2:34 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Caddo, Comanche, Cotton, Custer, Greer and 8 more	7 hr
May 27, 6:23 PM CDT	Mesoscale Discussion	SPC	Beckham, Cotton, Greer, Harmon, Jackson, Kiowa and 2 more	97 min

Nearby

Mesoscale Discussions in Oklahoma, 2008 Every mesoscale discussion in 2008

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.