Alert archive / Tennessee / Mesoscale Discussions in 2016
Mesoscale Discussion 581
The Storm Prediction Center issued this mesoscale discussion at May 10, 2016, 1:42 AM CDT for 4 states. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2016, 1:42 AM CDT (06:42 UTC)
- Expired
- May 10, 2016, 3:15 AM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 32 counties
Ashley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Union Parish, LA, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Houston County, TN, Lauderdale County, TN, Madison County, TN, Shelby County, TN, Tipton County, TN
The radar
The Memphis radar (KNQA), 106 km from the middle of the area, began a volume at 06:46 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
Little Rock, AR (KBYH), launched 00:00Z, 6.7 hours before the alert went out and 62 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
- 606 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 834 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 289 m²/s²
- 0-3 km storm-relative helicity
- 399 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 15.6
The text
As transmitted.
221
ACUS11 KWNS 100642
SWOMCD
SPC MCD 100642
TNZ000-MSZ000-MOZ000-ARZ000-LAZ000-100815-
MESOSCALE DISCUSSION 0581
NWS STORM PREDICTION CENTER NORMAN OK
0142 AM CDT TUE MAY 10 2016
AREAS AFFECTED...ERN ARKANSAS...WRN TENNESSEE...NW MISSISSIPPI
CONCERNING...TORNADO WATCH 157...158...
VALID 100642Z - 100815Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 157...158...CONTINUES.
SUMMARY...CONTINUING LOCALLY STRONG SURFACE GUSTS /STRONGEST OF
WHICH HAVE BEEN MEASURED APPROACHING SEVERE LIMITS/ ARE EXPECTED TO
DIMINISH WITHIN THE NEXT COUPLE OF HOURS. THE NEED FOR AN
ADDITIONAL WATCH IS NOT ANTICIPATED.
DISCUSSION...EMBEDDED WITHIN A 40 KT WEST SOUTHWESTERLY DEEP-LAYER
MEAN FLOW FIELD...LINGERING SQUALL LINE WILL PROGRESS ACROSS THE
MISSISSIPPI RIVER INTO WESTERN TENNESSEE AND NORTHWESTERN
MISSISSIPPI DURING THE NEXT HOUR OR TWO. LIGHTNING TRENDS AND MRMS
CAPPI DATA HAVE INDICATED A DISTINCT WEAKENING TREND TO THE STRONGER
CONVECTION... AND LITTLE IS EVIDENT TO SUGGEST POTENTIAL FOR FURTHER
INTENSIFICATION. IT IS NOT ENTIRELY CLEAR HOW MUCH OF ONGOING
ACTIVITY IS STILL ROOTED WITHIN THE BOUNDARY LAYER. BUT THE
POTENTIAL FOR CONTINUING CONVECTIVE DEVELOPMENT...ROOTED WITHIN THE
BOUNDARY LAYER...ALONG THE LEADING EDGE OF THE CONGLOMERATE
CONVECTIVE OUTFLOW...APPEARS LIKELY TO DIMINISH BY 08-09Z...IF NOT
BEFORE...AS ACTIVITY ADVANCES EAST OF JACKSON TN/OXFORD AND
GREENWOOD MS LINE.
..KERR.. 05/10/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OHX...MEG...JAN...LZK...SHV...
LAT...LON 33729198 33759155 34249084 34539053 34989009 35419000
35859005 36068996 36468746 34668939 33199076 32789253
33729198SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 7:23 PM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 53 more | 8 hr |
| May 9, 8:01 PM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 32 more | 89 min |
| May 9, 10:37 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll | 83 min |
| May 9, 11:15 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 26 more | 90 min |
| May 10, 3:08 PM CDT | Mesoscale Discussion | SPC | Montgomery, Robertson, Stewart | 67 min |
| May 10, 5:06 PM CDT | Tornado Watch | SPC | Benton, Carroll, Cheatham, Clay, Davidson, Dickson and 14 more | 6 hr |
Nearby
Mesoscale Discussions in Tennessee, 2016Mesoscale Discussions in Mississippi, 2016Mesoscale Discussions in Arkansas, 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.