Alert archive / Louisiana / Tornado Watches in 2003
Tornado Watch 366
The Storm Prediction Center issued this tornado watch at May 13, 2003, 10:45 PM CDT for 17 parishes in Louisiana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 13, 2003, 10:45 PM CDT (03:45 UTC)
- Expired
- May 14, 2003, 4:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties 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, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA
The radar
The Shreveport radar (KSHV), 68 km from the middle of the area, began a volume at 03:45 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.
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 |
|---|---|---|---|---|
| May 13, 11:08 PM CDT | Tornado Warning | SHV | Bossier, Caddo | 52 min |
| May 13, 11:08 PM CDT | Tornado Warning | SHV | Bienville | 67 min |
| May 13, 11:11 PM CDT | Severe Thunderstorm Warning | SHV | Jackson | 64 min |
| May 13, 11:19 PM CDT | Tornado Warning | SHV | Jackson | 56 min |
| May 13, 11:28 PM CDT | Severe Thunderstorm Warning | SHV | Webster | 62 min |
| May 13, 11:48 PM CDT | Severe Thunderstorm Warning | SHV | Bienville | 57 min |
| May 14, 12:00 AM CDT | Tornado Warning | SHV | Caddo, De Soto, Red River | 60 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 00:00Z, 3.8 hours before the alert went out and 61 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
- 2326 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 1006 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 401 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 18.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 140340
SEL6
SPC WW 140345
LAZ000-140900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 366
NWS STORM PREDICTION CENTER NORMAN OK
1045 PM CDT TUE MAY 13 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN LOUISIANA
EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1045 PM
UNTIL 400 AM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF SHREVEPORT
LOUISIANA TO 25 MILES SOUTH SOUTHEAST OF MONROE LOUISIANA.
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.
OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES SEVERE
THUNDERSTORM WATCH NUMBER 364. WATCH NUMBER 364 WILL NOT BE IN
EFFECT AFTER 1045 PM CDT. CONTINUE...WW 365...
DISCUSSION...SEVERAL STRONG SUPERCELLS CONTINUE TO DEVELOP SEWD
ACROSS NWRN LA. WITH IMPRESSIVE VEERING SHEAR PROFILE COUPLED WITH
THE STRONG INSTABILITY...ISOLATED TORNADOES ARE LIKELY ALONG WITH
THE VERY LARGE HAIL AND DAMAGING WINDS
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600.
MEAN STORM MOTION VECTOR 32030.
...HALES
325,0935 325,0915 312,0915 312,0935SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 8:05 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more | 55 min |
| May 13, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 15 more | 5 hr |
| May 14, 10:55 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, Webster | 2 hr |
| May 14, 2:30 PM CDT | Tornado Watch | SPC | Bossier, Caddo, Claiborne, Lincoln, Ouachita, Union and 1 more | 6 hr |
| May 14, 5:17 PM CDT | Mesoscale Discussion | SPC | Bossier, Claiborne, Jackson, Lincoln, Union, Webster | 118 min |
| May 14, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, East Carroll and 13 more | 6 hr |
Nearby
Tornado Watches in Louisiana, 2003Every tornado watch in 2003
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.