Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 180
The Storm Prediction Center issued this mesoscale discussion at Feb 29, 2012, 8:07 AM CST for 4 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Feb 29, 2012, 8:07 AM CST (14:07 UTC)
- Expired
- Feb 29, 2012, 9:00 AM CST
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 42 counties
Clay County, AR, Craighead County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Todd County, KY, Trigg County, KY, Webster County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Carroll County, TN, Crockett County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Tipton County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 97 km from the middle of the area, began a volume at 14:11 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
Little Rock, AR (KLZK), launched 12:00Z, 2.1 hours before the alert went out and 174 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
- 1168 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 535 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 289 m²/s²
- 0-3 km storm-relative helicity
- 292 m²/s²
- Significant tornado parameter
- 2.3
- Supercell composite
- 8.5
The text
As transmitted, in the capitals the NWS used until 2016.
981
ACUS11 KWNS 291407
SWOMCD
SPC MCD 291407
KYZ000-TNZ000-ILZ000-MOZ000-ARZ000-291500-
MESOSCALE DISCUSSION 0180
NWS STORM PREDICTION CENTER NORMAN OK
0807 AM CST WED FEB 29 2012
AREAS AFFECTED...NERN AR/PART OF WRN TN/FAR SERN MO AND WRN KY
CONCERNING...TORNADO WATCH 44...45...
VALID 291407Z - 291500Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 44...45...CONTINUES.
WW 44 WHICH IS SCHEDULED TO EXPIRE AT 15Z MAY NEED TO BE EXTENDED
LOCALLY IN TIME TO 16 OR 17Z. AN ONGOING STRONG-SEVERE STORM OVER
FULTON COUNTY KY/OBION COUNTY TN IS TRACKING ENE AND WILL AFFECT THE
FAR SERN PART OF WW 44 BETWEEN 15-1630Z.
AT 14Z...REGIONAL RADAR IMAGERY/LIGHTNING DATA SHOWED THE WRN EXTENT
OF THE OVERNIGHT MCS EXTENDED FROM WRN KY SWWD INTO NERN AR....WITH
ONGOING STRONG TO SEVERE STORMS EMBEDDED WITHIN THIS LINE. THIS
ACTIVITY WAS LOCATED WITHIN A CORRIDOR OF WEAK INSTABILITY /MUCAPE
AROUND 500 J/KG/...BUT STRONG DEEP LAYER SHEAR /50-70 KT/ AND LOW
LEVEL SHEAR /EFFECTIVE SRH OF 300-500 M2 PER S2/ CONTINUE TO FAVOR
BOWING SEGMENTS AND A TORNADO THREAT.
..PETERS.. 02/29/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...OHX...PAH...MEG...LZK...
LAT...LON 35869153 36499049 37068878 37498789 37728691 36698710
36428805 35818829 35438879 35379033 35339167 35869153SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 10:30 PM CST | Tornado Watch | SPC | Baxter, Benton, Boone, Carroll, Conway, Crawford and 20 more | 6 hr |
| Feb 28, 11:40 PM CST | Mesoscale Discussion | SPC | Benton | 95 min |
| Feb 29, 12:49 AM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Chicot, Clay, Cleburne and 31 more | 56 min |
| Feb 29, 3:20 AM CST | Tornado Watch | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Fulton and 20 more | 9 hr |
| Feb 29, 3:53 AM CST | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 20 more | 97 min |
| Feb 29, 11:11 AM CST | Mesoscale Discussion | SPC | Crittenden, Mississippi | 2 hr |
| Feb 29, 11:46 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more | 89 min |
| Feb 29, 2:15 PM CST | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 6 hr |
| Feb 29, 1:14 AM CST | Tornado Watch | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more | 11 hr |
| Feb 29, 2:40 AM CST | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Boone and 63 more | 65 min |
| Feb 29, 4:39 AM CST | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bourbon and 54 more | 7 hr |
| Feb 29, 7:27 AM CST | Tornado Watch | SPC | Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more | 5 hr |
| Feb 29, 7:38 AM CST | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Boone and 70 more | 67 min |
| Feb 29, 11:31 AM CST | Tornado Watch | SPC | Adair, Allen, Barren, Bath, Bell, Boyle and 59 more | 8 hr |
| Feb 29, 11:41 AM CST | Mesoscale Discussion | SPC | Boone, Bracken, Campbell, Gallatin, Grant, Kenton and 2 more | 3 hr |
| Feb 29, 12:24 PM CST | Mesoscale Discussion | SPC | Boyd, Greenup, Lawrence | 36 min |
| Feb 29, 12:37 PM CST | Tornado Watch | SPC | Boyd, Carter, Greenup, Lawrence, Lewis, Mason | 7 hr |
| Feb 29, 3:18 PM CST | Mesoscale Discussion | SPC | Boyd, Carter, Greenup, Lawrence, Lewis | 87 min |
| Feb 29, 3:34 PM CST | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bath, Bell, Boyle and 48 more | 116 min |
| Feb 28, 8:23 PM CST | Mesoscale Discussion | SPC | Atchison, Holt, Nodaway | 37 min |
| Feb 28, 9:47 PM CST | Mesoscale Discussion | SPC | Bates, Buchanan, Caldwell, Carroll, Cass, Clay and 9 more | 58 min |
| Feb 28, 10:07 PM CST | Severe Thunderstorm Watch | SPC | Bates, Caldwell, Carroll, Cass, Clay, Clinton and 9 more | 3 hr |
| Feb 29, 1:48 PM CST | Tornado Watch | SPC | Franklin, Lincoln, Moore | 7 hr |
| Feb 29, 2:23 PM CST | Mesoscale Discussion | SPC | Johnson | 67 min |
| Feb 29, 4:36 PM CST | Mesoscale Discussion | SPC | Blount, Bradley, Carter, Cocke, Greene, Hamilton and 6 more | 54 min |
| Feb 29, 5:37 PM CST | Tornado Watch | SPC | Blount, Bradley, Carter, Cocke, Greene, Hamilton and 10 more | 3 hr |
Nearby
Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Arkansas, 2012Every mesoscale discussion in 2012
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.