Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 2176
The Storm Prediction Center issued this mesoscale discussion at Sep 14, 2011, 12:44 PM CDT for 9 counties in Mississippi; 17 counties in Tennessee. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Sep 14, 2011, 12:44 PM CDT (17:44 UTC)
- Expired
- Sep 14, 2011, 2:15 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 26 counties
Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Perry County, TN, Shelby County, TN, Tipton County, TN, Wayne County, TN
The radar
The Memphis radar (KNQA), 70 km from the middle of the area, began a volume at 17:44 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 (KLZK), launched 12:00Z, 5.7 hours before the alert went out and 89 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
- 2392 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 1548 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
318
ACUS11 KWNS 141745
SWOMCD
SPC MCD 141744
TNZ000-ALZ000-MSZ000-ARZ000-141915-
MESOSCALE DISCUSSION 2176
NWS STORM PREDICTION CENTER NORMAN OK
1244 PM CDT WED SEP 14 2011
AREAS AFFECTED...WRN TN...NRN MS
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 141744Z - 141915Z
AN ISOLATED SEVERE THREAT WILL LIKELY CONTINUE ACROSS WRN TN AND MAY
EXPAND SWD INTO NRN MS THIS AFTERNOON. HAIL AND A MARGINAL WIND
DAMAGE THREAT MAY OCCUR WITH THE STRONGER CELLS. WW ISSUANCE IS NOT
EXPECTED ACROSS THE REGION.
A BROKEN LINE OF THUNDERSTORMS ONGOING FROM NEAR THE BOOTHEEL OF MO
SWD ACROSS WRN TN IS LOCATED TO THE NORTHEAST OF A SFC LOW NEAR THE
NRN EDGE OF A PLUME OF MOISTURE. SFC DEWPOINTS NEAR 70 F ALONG THE
MOIST AXIS ARE HELPING TO CREATE A POCKET OF MODERATE TO STRONG
INSTABILITY ACROSS NRN MS EXTENDING NWD INTO WRN TN. SBCAPE VALUES
ARE ESTIMATED IN THE 2000 TO 3000 J/KG RANGE ACROSS MUCH OF THE MCD
AREA. THIS ALONG WITH LARGE-SCALE ASCENT ASSOCIATED WITH A SHORTWAVE
TROUGH MOVING INTO THE MID-MS VALLEY WILL LIKELY SUPPORT THE
CONVECTION AS IT MOVES EWD INTO SCNTRL TN THIS AFTERNOON. WSR-88D
VWPS IN WRN TN CURRENTLY SHOW 0-6 KM SHEAR VALUES IN THE 30 35 KT
RANGE SUGGESTING ENOUGH SHEAR EXISTS FOR A MARGINAL SEVERE THREAT.
ALTHOUGH HAIL MAY BE THE GREATEST THREAT...A MARGINAL WIND DAMAGE
THREAT COULD ALSO EXIST ESPECIALLY AS THE CELLS BECOME INCREASINGLY
SFC-BASED THIS AFTERNOON.
..BROYLES.. 09/14/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OHX...HUN...MEG...
LAT...LON 34478993 34358917 34758794 35358759 35888773 36178843
36048948 35788989 35409003 34989009 34478993SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 2:36 PM CDT | Mesoscale Discussion | SPC | Lake | 84 min |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Mississippi, 2011Every mesoscale discussion in 2011
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.