Alert archive / Louisiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 47, NWS Shreveport, LA

April 15, 2001LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 15, 2001, 2:49 PM CDT for LaSalle Parish, Louisiana. It was in force for 56 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 15, 2001, 2:49 PM CDT (19:49 UTC)
Expired: Apr 15, 2001, 3:45 PM CDT
In force: 56 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 97 km from the middle of the area, began a volume at 19:52 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 was reported inside it

Time	Report	Where	Remark
Apr 15, 3:00 PM CDT	Thunderstorm Wind 52 E	Olla, LA	Trees were blown down across Hwy 165.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 15, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.8 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 651 J/kg
Mixed-layer CIN: -316 J/kg
Mixed-layer LCL: 1027 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

154 
WUUS54 KSHV 151950
SVRSHV
LAC059-152045-
/NEW.KSHV.SV.W.0051.151949-152045/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
249 PM CDT SUN APR 15 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LA SALLE PARISH IN NORTH CENTRAL LOUISIANA

* UNTIL 345 PM CDT

* AT 249 PM CDT...THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES NORTHWEST OF
  JENA...MOVING EAST AT 40 MPH.

THIS THUNDERSTORM WILL PRODUCE LARGE HAIL AND STRONG DAMAGING WINDS.
DO NOT REMAIN OUTSIDE.

REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE
THUNDERSTORM WARNING FOR...
  LA SALLE PARISH IN NORTH CENTRAL LOUISIANA
UNTIL 345 PM CDT.

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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 15, 11:10 AM CDT, 3 hours 39 minutes earlier.

Area forecast discussion, Apr 15, 11:10 AM CDT, 3 hours 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1110 AM CDT SUN APR 15 2001

UPDATED TO REMOVE POPS NORTH...INCREASE THEM FOR MONROE. MAX TEMPS
WERE ADJUSTED ACCORDING TO CURRENT TEMPS AND CLOUD COVER. RAISED FAR
NW...LOWERED SOME OTHERS. ON THE WHOLE...FORECAST SHAPING UP WELL AS
BAND OF SHWRS AND TSTMS MOVE SEWD. 17

.SHV...NONE.

In the hours before

Special weather statement, Apr 15, 10:30 AM CDT, 4 hours 19 minutes before

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-151630-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1030 AM CDT SUN APR 15 2001

A SOUTHWARD MOVING FRONTAL BOUNDARY WILL BE ACCOMPANIED BY SHOWERS
AND THUNDERSTORMS TODAY AND EARLY THIS EVENING. THE THREAT OF
THUNDERSTORMS HAS ALREADY ENDED FOR IDABEL...NEW BOSTON...AND HOPE.
MOST OF THE REMAINING ACTIVITY WILL OCCUR OVER LOUISIANA...WITH
SCATTERED STORMS ALSO POSSIBLE OVER NORTHEAST TEXAS. ALTHOUGH UPPER
LEVEL INSTABILITY IS GREAT...WARM TEMPERATURES IN THE LOWEST TWO
MILES OF THE ATMOSPHERE WILL TEND TO INHIBIT THE POSSIBILITY OF A
SEVERE WEATHER OUTBREAK. THERE REMAINS...HOWEVER...A SLIGHT CHANCE
OF SEVERE THUNDERSTORMS FOR TODAY AND THIS EVENING FOR MUCH OF
LOUISIANA...AS WELL AS FOR THOSE PORTIONS OF NORTHEAST TEXAS ALONG
AND SOUTH OF THE INTERSTATE 20 CORRIDOR. IF SEVERE THUMNDERSTORMS DO
DEVELOP...THE PRIMARY THREAT POSED WILL BE LARGE HAIL AND DAMAGING
WIND GUSTS.

THE ACTIVATION OF STORM SPOTTERS...EMERGENCY MANAGERS...AND SKYWARN
NETWORKS...IS NOT YET ANTICIPATED FOR THIS AFTERNOON AND TONIGHT.

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 12:23 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	67 min
Apr 15, 1:41 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches	19 min
Apr 15, 1:53 PM CDT	Severe Thunderstorm Warning	SHV	Winn	37 min
Apr 15, 2:15 PM CDT	Severe Thunderstorm Warning	SHV	Grant	60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.