Alert archive / Oklahoma / Mesoscale Discussions in 2016
Mesoscale Discussion 573
The Storm Prediction Center issued this mesoscale discussion at May 9, 2016, 5:49 PM CDT for 10 counties in Arkansas; 18 counties in Oklahoma; 5 counties in Texas. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- May 9, 2016, 5:49 PM CDT (22:49 UTC)
- Expired
- May 9, 2016, 6:45 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 33 counties
Crawford County, AR, Hempstead County, AR, Howard County, AR, Little River County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Bowie County, TX, Delta County, TX, Fannin County, TX, Lamar County, TX, Red River County, TX
The radar
The Western Arkansas radar (KSRX), 144 km from the middle of the area, began a volume at 22:49 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.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 10.8 hours before the alert went out and 188 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.
- Mixed-layer CAPE
- 686 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 620 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 336 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 6.0
The text
As transmitted.
474
ACUS11 KWNS 092249
SWOMCD
SPC MCD 092249
ARZ000-TXZ000-OKZ000-092345-
MESOSCALE DISCUSSION 0573
NWS STORM PREDICTION CENTER NORMAN OK
0549 PM CDT MON MAY 09 2016
AREAS AFFECTED...SOUTH-CENTRAL/SOUTHEAST OK AND FAR NORTH TX TO AR
CONCERNING...TORNADO WATCH 155...
VALID 092249Z - 092345Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 155 CONTINUES.
SUMMARY...ASIDE FROM LARGE HAIL...A TORNADO RISK WILL CONTINUE
PARTICULARLY OVER THE NEXT 1-2 HOURS /POTENTIALLY THROUGH AT LEAST
00-01Z/ ACROSS CENTRAL/SOUTH-CENTRAL OK INTO SOUTHEAST OK AND
POSSIBLY EAST-CENTRAL OK. TORNADO WATCH 155 CONTINUES UNTIL 02Z/9PM
CDT.
DISCUSSION...FOUR DISTINCT SUPERCELLS ARE ONGOING ACROSS
SOUTH-CENTRAL/CENTRAL OK ROUGHLY 35-40 MILES EAST OF I-35 AS OF 530
PM CDT...WITH THE MOST PROMINENT SUPERCELL WITH A HISTORY OF A
TORNADO AND HIGHER-END VELOCITY SIGNATURE CURRENTLY SHOWING A
WEAKENING TREND ACROSS PONTOTOC COUNTY OK. AFTER INITIATING NEAR THE
DRYLINE...THESE STORMS ARE LIKELY THRIVING IN A
BAROCLINICITY/VORTICITY-RICH ENVIRONMENT AIDED BY EARLY-DAY
PRECIPITATION/RESIDUAL CLOUD COVER. ENVIRONMENT 0-1 KM SRH IS LIKELY
IN EXCESS OF 250 M2/S2 PARTICULARLY ACROSS SOUTH-CENTRAL/SOUTHEAST
OK AS SUBSTANTIATED BY KTLX WSR-88D VWP DATA AND CONTEMPORARY
MODIFICATIONS TO THE 18Z OBSERVED NORMAN SOUNDING. ACCORDINGLY...THE
TORNADO THREAT SHOULD CONTINUE PARTICULARLY FROM SOUTH-CENTRAL INTO
SOUTHEAST OK. THIS CORRIDOR IS OBSERVATIONALLY CONSISTENT WITH
REGIONALLY MAXIMIZED PRESSURE FALLS...A CONTINUED TENDENCY FOR A
BACKING OF LOW-LEVEL WINDS....AND WARMER AIR ACROSS FAR SOUTHEAST OK
AND ADJACENT ARKLATEX /SOMEWHAT COOLER TEMPERATURES AND THICKER
CLOUD COVER HAS PERSISTED ACROSS PARTS OF EAST-CENTRAL AND NORTHEAST
OK/.
..GUYER.. 05/09/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SHV...TSA...FWD...OUN...
LAT...LON 34679677 35559689 35729410 34749348 33479370 33359620
33449664 34679677SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 1:39 PM CDT | Mesoscale Discussion | SPC | Howard, Little River, Montgomery, Polk, Scott, Sebastian and 1 more | 66 min |
| May 9, 2:36 PM CDT | Tornado Watch | SPC | Crawford, Hempstead, Howard, Little River, Miller, Montgomery and 5 more | 7 hr |
| May 9, 6:38 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Fulton and 13 more | 97 min |
| May 8, 7:01 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 16 more | 89 min |
| May 9, 2:39 AM CDT | Mesoscale Discussion | SPC | Carter, Comanche, Cotton, Jefferson, Johnston, Love and 4 more | 3 hr |
| 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, 5:29 PM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Blaine, Caddo, Canadian, Cherokee and 35 more | 61 min |
| May 8, 8:01 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Concho, Cooke and 29 more | 89 min |
| May 9, 5:13 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Camp, Cass, Cherokee, Ellis and 25 more | 92 min |
Nearby
Mesoscale Discussions in Oklahoma, 2016Mesoscale Discussions in Arkansas, 2016Mesoscale Discussions in Texas, 2016Every 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.