Alert archive / Oklahoma / Mesoscale Discussions in 2016

Mesoscale Discussion 561

May 8, 201622 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 8, 2016, 7:01 PM CDT for 22 counties in Oklahoma. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 8, 2016, 7:01 PM CDT (00:01 UTC)
Expired: May 8, 2016, 8:30 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 22 counties

Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, McClain County, OK, Oklahoma County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK

The radar

The Vance AFB radar (KVNX), 113 km from the middle of the area, began a volume at 00:06 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, 0.0 hours before the alert went out and 118 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: 1059 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.5

Open this sounding in Storm Lab

The text

As transmitted.

489 
ACUS11 KWNS 090001
SWOMCD
SPC MCD 090001 
OKZ000-TXZ000-090130-

MESOSCALE DISCUSSION 0561
NWS STORM PREDICTION CENTER NORMAN OK
0701 PM CDT SUN MAY 08 2016

AREAS AFFECTED...WEST-CENTRAL OK AND WESTERN NORTH TX

CONCERNING...TORNADO WATCH 149...

VALID 090001Z - 090130Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 149 CONTINUES.

SUMMARY...WIDELY SCATTERED SPLITTING SUPERCELLS CAPABLE OF LARGE
HAIL...LOCALLY DAMAGING WINDS...AND TORNADO POTENTIAL WILL CONTINUE
TO SPREAD GENERALLY EAST-NORTHEASTWARD ACROSS SOUTHWEST OK AND
TOWARD MUCH OF CENTRAL OK THROUGH MID-EVENING. TORNADO WATCH 149
CONTINUES UNTIL 02Z/9PM CDT.

DISCUSSION...SPLITTING SUPERCELLS HAVE BEEN PREVALENT ACROSS THE
WESTERN HALF OF OKLAHOMA THROUGH LATE AFTERNOON/EARLY
EVENING...PRESUMABLY ATTRIBUTABLE TO RELATIVELY STRAIGHT HODOGRAPHS
ABOVE THE SURFACE. LARGE HAIL WILL REMAIN A DISTINCT POSSIBILITY
WITH THE LEFT-MOVING STORMS AMID AMPLE CLOUD-BEARING SHEAR/MODEST
BUOYANCY...WHILE ISOLATED TORNADO/LARGE HAIL AND LOCALLY DAMAGING
WIND POTENTIAL WILL EXIST IN THE SHORT-TERM WITH ANY RIGHT-MOVING
SUPERCELLS ESPECIALLY ACROSS SOUTHWEST/SOUTH-CENTRAL OK...SUCH AS
THE CURRENT /645 PM CDT/ SUPERCELL BETWEEN LAWTON AND THE
DUNCAN/MARLOW AREAS. A 56 KT WIND GUST WAS MEASURED AT LAWTON AT
AROUND 622 PM CDT/2322Z. EVEN WHILE LOW-LEVEL SHEAR WILL INCREASE
THIS EVENING...CONSIDERABLE/STABLE-CHARACTER CLOUD COVER HAS
PERSISTED ACROSS THE EASTERN HALF OF OK. CURRENT THINKING IS THAT
WEAK LOW-LEVEL PARCEL ACCELERATIONS SHOULD EVENTUALLY LEAD TO A
DIMINISHING INTENSITY TREND FOR MOST STORMS AS THEY PROGRESS TO
NEAR/EAST OF THE I-35 CORRIDOR.

..GUYER.. 05/09/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FWD...OUN...

LAT...LON   36979867 36869721 33759755 34239959 35849937 36979867

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 2:39 AM CDT	Mesoscale Discussion	SPC	Carter, Comanche, Cotton, Jefferson, Johnston, Love and 4 more	3 hr
May 9, 1:39 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 14 more	66 min
May 9, 1:46 PM CDT	Mesoscale Discussion	SPC	Adair, Alfalfa, Canadian, Cherokee, Craig, Creek and 22 more	59 min
May 9, 2:07 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Alfalfa, Blaine, Canadian, Cherokee, Cleveland and 31 more	10 hr
May 9, 2:36 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 28 more	7 hr
May 9, 5:29 PM CDT	Mesoscale Discussion	SPC	Adair, Alfalfa, Blaine, Caddo, Canadian, Cherokee and 35 more	61 min
May 9, 5:49 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 12 more	56 min

Nearby

Mesoscale Discussions in Oklahoma, 2016 Every mesoscale discussion in 2016

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.