Alert archive / Oklahoma / Mesoscale Discussions in 2016
Mesoscale Discussion 501
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2016, 3:56 PM CDT for 24 counties in Oklahoma. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2016, 3:56 PM CDT (20:56 UTC)
- Expired
- Apr 29, 2016, 5:00 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 24 counties
Atoka County, OK, Bryan County, OK, Caddo County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Stephens County, OK
The radar
The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 68 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
- 123 J/kg
- Mixed-layer CIN
- -903 J/kg
- Mixed-layer LCL
- 632 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 239 m²/s²
- 0-3 km storm-relative helicity
- 348 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.0
The text
As transmitted.
014
ACUS11 KWNS 292056
SWOMCD
SPC MCD 292056
OKZ000-TXZ000-292200-
MESOSCALE DISCUSSION 0501
NWS STORM PREDICTION CENTER NORMAN OK
0356 PM CDT FRI APR 29 2016
AREAS AFFECTED...CNTRL OK
CONCERNING...TORNADO WATCH 126...
VALID 292056Z - 292200Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 126 CONTINUES.
SUMMARY...TORNADO THREAT EXPECTED TO CONTINUE FOR THE NEXT HOUR OR
TWO. LARGE HAIL AND DAMAGING WIND GUSTS ALSO REMAIN POSSIBLE.
DISCUSSION...SUPERCELL OVER SRN CADDO/NRN COMANCHE COUNTY HAS
STRENGTHENED WITH A BROAD VROT RECENTLY ESTIMATED AROUND 60 KT.
AIRMASS DOWNSTREAM IS CHARACTERIZED BY FAVORABLE THERMODYNAMICS WITH
TEMPERATURES IN THE 80S AND DEWPOINTS IN THE LOW 70S. LATEST
MESOANALYSIS ESTIMATES MLCAPE APPROACHING 2000 J PER KG. IN
CONTRAST...LOW-LEVEL HODOGRAPH AT TLX HAS BEEN SHRINKING OVER THE
PAST HOUR AS LOW-LEVEL FLOW GRADUALLY WEAKENS. EVEN WITH THE
WEAKENING WINDS...THE TORNADO THREAT WITH THIS STORM IS EXPECTED TO
PERSIST FOR AT LEAST THE NEXT HOUR OR TWO. VERY LARGE HAIL AND
DAMAGING WINDS ALSO REMAIN PROBABLE.
..MOSIER.. 04/29/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...FWD...OUN...
LAT...LON 33919849 34569888 35349836 35469776 35429562 34529510
33789653 33919849SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 10:54 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Cimarron, Texas | 7 hr |
| Apr 29, 1:58 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 14 more | 2 hr |
| Apr 29, 2:59 AM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper | 91 min |
| Apr 29, 4:21 AM CDT | Severe Thunderstorm Watch | SPC | Haskell, Latimer, LeFlore, McIntosh, Muskogee, Pittsburg and 2 more | 6 hr |
| Apr 29, 4:54 AM CDT | Mesoscale Discussion | SPC | Harmon | 66 min |
| Apr 29, 12:51 PM CDT | Mesoscale Discussion | SPC | McCurtain | 114 min |
| Apr 29, 1:40 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cleveland, Coal, Comanche and 15 more | 65 min |
| Apr 29, 1:43 PM CDT | Tornado Watch | SPC | McCurtain | 8 hr |
| Apr 29, 1:57 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Choctaw and 27 more | 8 hr |
| Apr 29, 5:42 PM CDT | Mesoscale Discussion | SPC | McCurtain | 93 min |
| Apr 29, 6:16 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 25 more | 89 min |
Nearby
Mesoscale Discussions in Oklahoma, 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.