Alert archive / Louisiana / Tornado Watches in 2019
Tornado Watch 697
The Storm Prediction Center issued this tornado watch at Nov 30, 2019, 11:38 AM CST for 17 counties in Arkansas; 20 parishes in Louisiana; 13 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 30, 2019, 11:38 AM CST (17:38 UTC)
- Expired
- Nov 30, 2019, 7:00 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 50 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX
The radar
The Shreveport radar (KSHV), 38 km from the middle of the area, began a volume at 17:37 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 12:21 PM CST | Severe Thunderstorm Warning | LZK | Bradley, Calhoun, Cleveland, Drew, Lincoln | 24 min |
| Nov 30, 2:23 PM CST | Severe Thunderstorm Warning | SHV | De Soto, Natchitoches, Red River, Sabine | 52 min |
| Nov 30, 2:56 PM CST | Severe Thunderstorm Warning | SHV | Jackson, Lincoln, Ouachita, Union | 49 min |
| Nov 30, 3:24 PM CST | Severe Thunderstorm Warning | SHV | Jackson, Winn | 51 min |
| Nov 30, 3:57 PM CST | Severe Thunderstorm Warning | SHV | Caldwell, Ouachita | 48 min |
| Nov 30, 3:59 PM CST | Severe Thunderstorm Warning | LZK | Desha, Drew | 31 min |
| Nov 30, 4:09 PM CST | Severe Thunderstorm Warning | JAN | Franklin, Richland | 51 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 5.6 hours before the alert went out and 30 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
- 320 J/kg
- Mixed-layer CIN
- -311 J/kg
- Mixed-layer LCL
- 606 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 487 m²/s²
- 0-3 km storm-relative helicity
- 527 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted.
948
WWUS20 KWNS 301735
SEL7
SPC WW 301735
ARZ000-LAZ000-TXZ000-010100-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 697
NWS Storm Prediction Center Norman OK
1235 PM CDT Sat Nov 30 2019
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Southern Arkansas
Northern Louisiana
East Texas
* Effective this Saturday afternoon and evening from 1235 PM
until 800 PM CDT.
* Primary threats include...
A couple tornadoes possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Multiple bands/corridors of storms will increase across
the region, initially across far east Texas, southern Arkansas, and
northwest Louisiana early this afternoon, and by mid-afternoon
across additional parts of northern Louisiana. Conditions are
favorable for supercells/organized line segments capable of damaging
winds/hail and a couple of tornadoes.
The tornado watch area is approximately along and 80 statute miles
east and west of a line from 65 miles west southwest of Natchitoches
LA to 25 miles north of Monticello AR. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24040.
...GuyerSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 4:45 AM CST | Mesoscale Discussion | SPC | Polk | 2 hr |
| Nov 30, 9:46 AM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 12 more | 3 hr |
| Nov 30, 2:10 PM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot, Desha, Drew, Union | 2 hr |
| Nov 30, 2:31 PM CST | Mesoscale Discussion | SPC | Lee, Phillips | 59 min |
| Nov 30, 3:54 PM CST | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Tensas | 7 hr |
Nearby
Tornado Watches in Louisiana, 2019Tornado Watches in Arkansas, 2019Tornado Watches in Texas, 2019Every tornado watch in 2019
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.