Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 8, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Feb 5, 2020, 2:27 PM CST for 4 parishes in Louisiana. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 5, 2020, 2:27 PM CST (20:27 UTC)
- Expired
- Feb 5, 2020, 3:00 PM CST
- In force
- 33 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties East Baton Rouge Parish, LA, Iberville Parish, LA, Livingston Parish, LA, West Baton Rouge Parish, LA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 5, 11:49 AM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 138 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
- 743 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 509 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 195 m²/s²
- 0-3 km storm-relative helicity
- 380 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.4
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 5, 1:35 PM CST, 52 minutes earlier.
Area forecast discussion, Feb 5, 1:35 PM CST, 52 minutes before
Area Forecast Discussion
National Weather Service New Orleans LA
135 PM CST Wed Feb 5 2020
.UPDATE...
Scattered to numerous showers and thunderstorms have been ongoing
through the day, and updates were sent for areas of higher and
lower coverage earlier and for the heavy banding and locally
training thunderstorms that occurred on the Mississippi Gulf
coast earlier. Regarding severe thunderstorm potential,
Instability is gradually ramping up in areas experiencing somewhat
higher temperatures in the low to mid 70s to go with the very
favorable shear profiles and large scale ascent. Recent SPC
Mesoscale Discussion is monitoring need for another Severe Weather
Watch across the forecast area southeast of the current Tornado
Watch.
&&
.AVIATION...
Conditions were highly variable from LIFR to VFR depending on
location. Conditions should trend mostly in the MVFR to IFR range
this afternoon before lowering to IFR to LIFR again tonight ito
Thursday morning. SHRA/TSRA will continue to bring much lower VSBY
and lower CIGS at times through the forecast period. Southerly
winds will also remain moderate with gusts near 20 knots or higher
at times through tonight before the cold front shifts the winds to
west to northwest during the 06z-15z time period.
&&
22/TD
.PREV DISCUSSION... /issued 644 AM CST Wed Feb 5 2020/
SOUNDING DISCUSSION...Low and mid-level instability is noted in
the 12z sounding this morning. MUCAPE is already a decent 1935 J/KG
and mid-level lapse rates between 3 and 6km are up to 5.9C/km. As
temperatures warm with daytime heating today, instability in the
low and mid-levels should further increase. A strong 120 knot jet
is located around 200mb, and a strong low level jet of 35 to 40
knots is also in place. This LLJ is resulting in ample shear in
the lowest 3km with 42 knots of speed shear and 345 M2/S2 of
helicity noted. These values are high enough to support tilted
updrafts and mesocyclone development with any deeper convection
that forms today. One other contributing factor to a higher risk
of damaging storms today is a low LCL reading of 971mb or 1100
feet. This low LCL would support any severe convection becoming
surface based.
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 73 53 56 35 / 90 90 60 0
BTR 77 50 52 36 / 100 90 60 0
ASD 76 55 58 36 / 100 100 80 10
MSY 75 55 57 41 / 100 100 80 10
GPT 70 59 60 38 / 100 100 90 10
PQL 72 61 62 37 / 100 90 90 20
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...Gale Watch from Thursday afternoon through late Thursday night
for GMZ536-538-550-552-555-557-570-572-575-577.
Small Craft Advisory until noon CST Thursday for GMZ536-538-550-
552-555-557-570-572-575-577.
Small Craft Advisory from noon Thursday to 3 AM CST Friday for
GMZ530-534.
Small Craft Advisory until 3 AM CST Friday for GMZ532.
MS...Flash Flood Watch through Thursday afternoon for MSZ080>082.
GM...Gale Watch from Thursday afternoon through late Thursday night
for GMZ538-550-552-555-557-570-572-575-577.
Small Craft Advisory until noon CST Thursday for GMZ538-550-552-
555-557-570-572-575-577.
Small Craft Advisory from noon Thursday to 3 AM CST Friday for
GMZ534.
&&In the hours before
Special weather statement, Feb 5, 1:48 PM CST, 39 minutes before
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</html>The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 5, 4:03 AM CST | Gale Watch | LIX | 23 hr | |
| Feb 5, 4:03 AM CST | Marine Dense Fog Advisory | LIX | 6 hr | |
| Feb 5, 4:03 AM CST | Small Craft Advisory | LIX | 44 hr | |
| Feb 5, 8:28 AM CST | River Flood Warning | LIX | Saint Tammany, Washington | 47 days |
| Feb 5, 9:31 AM CST | Special Weather Statement | LIX | Jefferson, Lafourche | 29 min |
| Feb 5, 9:57 AM CST | Special Weather Statement | LIX | Jefferson, Orleans, Saint Charles | 48 min |
| Feb 5, 10:06 AM CST | Marine Dense Fog Advisory | LIX | 54 min | |
| Feb 5, 10:08 AM CST | Special Marine Warning | LIX | 37 min | |
| Feb 5, 10:09 AM CST | Special Marine Warning | LIX | 36 min | |
| Feb 5, 10:11 AM CST | Special Marine Warning | LIX | 49 min | |
| Feb 5, 10:14 AM CST | Special Marine Warning | LIX | 46 min | |
| Feb 5, 10:38 AM CST | Special Weather Statement | LIX | Saint Tammany | 52 min |
| Feb 5, 10:42 AM CST | Special Marine Warning | LIX | 48 min | |
| Feb 5, 10:43 AM CST | Special Marine Warning | LIX | 47 min | |
| Feb 5, 12:05 PM CST | Special Weather Statement | LIX | Terrebonne | 25 min |
| Feb 5, 12:30 PM CST | Special Weather Statement | LIX | Lafourche | 30 min |
| Feb 5, 12:52 PM CST | Special Weather Statement | LIX | Pointe Coupee | 23 min |
| Feb 5, 12:55 PM CST | Special Weather Statement | LIX | Saint Charles | 35 min |
| Feb 5, 12:58 PM CST | Special Weather Statement | LIX | Jefferson | 32 min |
| Feb 5, 1:15 PM CST | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Saint Bernard | 30 min |
| Feb 5, 1:17 PM CST | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard | 28 min |
| Feb 5, 1:28 PM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana | 32 min |
| Feb 5, 1:32 PM CST | Special Marine Warning | LIX | 28 min | |
| Feb 5, 1:41 PM CST | Severe Thunderstorm Warning | LIX | Orleans, Saint Tammany | 18 min |
| Feb 5, 1:48 PM CST | Special Weather Statement | LIX | Orleans | 27 min |
| Feb 5, 1:55 PM CST | Special Marine Warning | LIX | 50 min | |
| Feb 5, 2:02 PM CST | Special Weather Statement | LIX | East Baton Rouge, Iberville, West Baton Rouge | 43 min |
| Feb 5, 2:37 PM CST | Special Marine Warning | LIX | 23 min | |
| Feb 5, 2:49 PM CST | Special Weather Statement | LIX | Iberville | 26 min |
| Feb 5, 2:57 PM CST | Special Weather Statement | LIX | Saint Helena | 48 min |
| Feb 5, 3:35 PM CST | Special Weather Statement | LIX | Washington | 55 min |
| Feb 5, 3:56 PM CST | Tornado Warning | LIX | Washington | 34 min |
| Feb 5, 10:36 AM CST | Special Weather Statement | LIX | Jackson | 39 min |
| Feb 5, 11:52 AM CST | Special Weather Statement | LIX | Jackson | 53 min |
| Feb 5, 12:28 PM CST | Special Weather Statement | LIX | Amite | 32 min |
| Feb 5, 12:44 PM CST | Special Weather Statement | LIX | Jackson | 16 min |
| Feb 5, 2:19 PM CST | Special Weather Statement | LIX | Amite | 41 min |
| Feb 5, 2:31 PM CST | Special Weather Statement | LIX | Harrison | 29 min |
| Feb 5, 2:53 PM CST | Special Weather Statement | LIX | Jackson | 52 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2020Every severe thunderstorm warning in 2020
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.