Alert archive / Oklahoma / Mesoscale Discussions in 2016

Mesoscale Discussion 461

April 26, 201610 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2016, 5:13 PM CDT for 10 counties in Oklahoma. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2016, 5:13 PM CDT (22:13 UTC)
Expired: Apr 26, 2016, 6:15 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Garfield County, OK, Grant County, OK, Kingfisher County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 99 km from the middle of the area, began a volume at 22:14 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 12:00Z, 10.2 hours before the alert went out and 107 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: 2872 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted.

147 
ACUS11 KWNS 262213
SWOMCD
SPC MCD 262213 
OKZ000-TXZ000-262315-

MESOSCALE DISCUSSION 0461
NWS STORM PREDICTION CENTER NORMAN OK
0513 PM CDT TUE APR 26 2016

AREAS AFFECTED...SWRN OK NWD INTO NWRN OK

CONCERNING...TORNADO WATCH 109...

VALID 262213Z - 262315Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 109 CONTINUES.

SUMMARY...LOW-LEVEL SHEAR HAS INCREASED SLIGHTLY OVER SWRN OK AND
THE TORNADO RISK MAY INCREASE SOME OVER THE NEXT 1-2 HOURS.

DISCUSSION...RADAR MOSAICS SHOWS WIDELY SCTD STRONG TO SEVERE STORMS
ON THE WRN EDGE OF THE MOIST PLUME LOCATED FROM SWRN OK NNEWD INTO
NWRN OK.  SURFACE DEWPOINTS ON THE INFLOW SIDE OF THE STORMS RANGES
FROM 66-68 DEG F WITH TEMPS IN THE MID-UPPER 70S.  THE UPPER-LEVEL
FORCED BAND OF ASCENT IS RAPIDLY APPROACHING WRN OK FROM W TX AND
WILL LIKELY LEAD TO ADDITIONAL TSTM DEVELOPMENT OVER THE NEXT
SEVERAL HOURS.  IN THE SHORT-TERM...KFDR VAD DATA HAS SHOWN SOME
TEMPERED ENLARGEMENT IN THE LOW-LEVEL HODOGRAPH DESPITE THE
CONTINUATION OF THE VEER-BACK-VEER CHARACTERISTIC IN THE WIND
PROFILE.  LARGE HAIL AND ISOLD DMGG WIND AND A FEW TORNADOES WILL BE
POSSIBLE OVER THE NEXT SEVERAL HOURS WITH THE STRONGER STORMS.

..SMITH.. 04/26/2016

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

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

LAT...LON   34559936 36199863 36919778 36539733 34369830 34199868
            34249915 34559936

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 10:09 AM CDT	Mesoscale Discussion	SPC	Creek, Lincoln, Nowata, Osage, Pawnee, Payne and 1 more	96 min
Apr 26, 1:35 PM CDT	Mesoscale Discussion	SPC	Washington	115 min
Apr 26, 1:53 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 35 more	2 hr
Apr 26, 2:32 PM CDT	Tornado Watch PDS	SPC	Alfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 47 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.