Alert archive / Oklahoma / Mesoscale Discussions in 2016

Mesoscale Discussion 359

April 11, 201616 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2016, 12:21 AM CDT for 16 counties in Oklahoma. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2016, 12:21 AM CDT (05:21 UTC)
Expired: Apr 11, 2016, 1:15 AM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 59 km from the middle of the area, began a volume at 05:20 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 watches that followed

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

Severe Thunderstorm Watch 83Apr 11, 12:55 AM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 5.4 hours before the alert went out and 57 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: 2443 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1418 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 243 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 13.4

Open this sounding in Storm Lab

The text

As transmitted.

043 
ACUS11 KWNS 110522
SWOMCD
SPC MCD 110521 
OKZ000-TXZ000-110615-

MESOSCALE DISCUSSION 0359
NWS STORM PREDICTION CENTER NORMAN OK
1221 AM CDT MON APR 11 2016

AREAS AFFECTED...PARTS OF CNTRL AND S-CNTRL OK

CONCERNING...SEVERE THUNDERSTORM WATCH 82...

VALID 110521Z - 110615Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 82
CONTINUES.

SUMMARY...SCATTERED SEVERE STRAIGHT-LINE WIND GUSTS OF 50-65 MPH ARE
POSSIBLE WITH A BOWING LINE.  SEVERE WIND GUSTS ARE POSSIBLE IN
ASSOCIATION WITH A WAKE LOW ON THE NRN END OF THE LINE.

DISCUSSION...0510Z RADAR IMAGERY SHOWS A BOWING LINE --RECENT
HISTORY OF 50-65 MPH WIND GUSTS-- MOVING ENEWD AROUND 65 MPH ACROSS
CNTRL AND S-CNTRL OK.  OK MESONET OBSERVATIONS CONFIRM A DESCENDING
REAR INFLOW JET/WAKE LOW HAS DEVELOPED ACROSS CNTRL OK...WITH A
RECENT HISTORY OF GUSTS AROUND 60 MPH WITH THIS FEATURE.  ALTHOUGH
SOME SLIGHT STABLE STRATIFICATION HAS OCCURRED IN THE LOW
LEVELS...FLOW AROUND 50 KT PER KTLX VAD DATA AT 1 KM AGL COUPLED
WITH STRONG DOWNDRAFTS WILL SUPPORT THE POTENTIAL FOR SEVERE WIND
GUSTS AT THE SURFACE OVER THE NEXT FEW HOURS.  A WATCH
EXTENSION-IN-AREA MAY BE NEEDED FROM HUGHES COUNTY SWD INTO BRYAN
COUNTY OK FOR THE RISK OF SEVERE WIND GUSTS.

..SMITH.. 04/11/2016

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

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

LAT...LON   35239759 35599733 35579658 35469618 34829606 34309623
            33879657 33989814 35239759

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 10, 7:36 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Coal and 23 more	114 min
Apr 10, 8:42 PM CDT	Mesoscale Discussion	SPC	Craig, Kay, Nowata, Osage, Ottawa, Rogers and 1 more	2 hr
Apr 10, 9:31 PM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more	59 min
Apr 10, 9:52 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Caddo, Canadian, Carter, Cleveland and 24 more	6 hr
Apr 10, 11:23 PM CDT	Mesoscale Discussion	SPC	Craig, Nowata, Osage, Ottawa, Rogers, Washington	37 min
Apr 11, 12:57 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Cherokee, Choctaw, Creek, Haskell, Latimer and 10 more	4 hr
Apr 11, 6:15 AM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Choctaw, Jefferson, Johnston, Love and 1 more	3 hr
Apr 11, 12:39 PM CDT	Mesoscale Discussion	SPC	Carter, Jefferson, Love, Marshall	2 hr
Apr 11, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 9 more	9 hr

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.