Alert archive / Louisiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 109, NWS Shreveport, LA

May 31, 2001Bossier Parish, Caddo Parish, De Soto Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 31, 2001, 5:40 AM CDT for Bossier Parish, Caddo Parish, De Soto Parish, Louisiana. It was in force for 65 min. 4 reports 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: May 31, 2001, 5:40 AM CDT (10:40 UTC)
Expired: May 31, 2001, 6:45 AM CDT
In force: 65 min
Issued by: NWS Shreveport, LA
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA

The radar

The Shreveport radar (KSHV), 9 km from the middle of the area, began a volume at 10:43 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
May 31, 5:40 AM CDT	Thunderstorm Wind 70 E	Shreveport, LA	Several businesses on North Market Street were damaged with windows blown out and some roof damage.
May 31, 5:40 AM CDT	Thunderstorm Wind 70 E	Bossier City, LA	A squall line with a bow echo thunderstorm moved across the south side of Bossier City. Several large trees were snapped or uprooted. Some of the trees fell on houses and cars. Numerous tree limbs were blown down. Several houses had shingles blown off and
May 31, 5:45 AM CDT	Thunderstorm Wind 60 E	Bossier City, LA	Extensive damage to homes in the Shady Grove Subdivision with numerous trees down.
May 31, 6:11 AM CDT	Hail 0.75	Shreveport, LA

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 nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 10.7 hours before the alert went out and 5 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: 3712 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1261 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 10.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 31, 3:00 AM CDT, 2 hours 40 minutes earlier.

Area forecast discussion, May 31, 3:00 AM CDT, 2 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
300 AM CDT THU MAY 31 2001

ON GOING SEVERE WEATHER THREAT THIS MORNING AS THUNDERSTORMS ARE
CONTINUING OVER SOUTHERN ARKANSAS...SOUTHEAST OKLAHOMA AND EXTREME
NORTHEAST TEXAS WHERE A WARM FRONT IS LOCATED. FORECAST PROBLEMS
THIS MORNING ARE MOVEMENT OF COLD FRONT AND AMOUNT OF PRECIPITATION
AND THREAT FOR SEVERE THUNDERSTORMS AS FRONT MOVES ACROSS FORECAST
AREA TODAY INTO FRIDAY MORNING. LOW PRESSURE NEAR KANSAS CITY WILL
SHIFT NORTHEAST INTO ILLINOIS BY FRIDAY MORNING WITH AN UPPER LEVEL
LOW MOVING INTO THE GREAT LAKES. THE UPPER LOW WILL MOVE NORTHEAST
AS A MID LEVEL RIDGE MOVES INTO THE ROCKIES. THE WARM FRONT WILL
MOVE NORTH INTO THE OHIO VALLEY BUT STORMS SHOULD REDEVELOP OR
STRENGTHEN LATER TODAY ALONG AND AHEAD OF THE COLD FRONT AND ALONG
OUTFLOW BOUNDARIES FROM STORMS THIS MORNING.

SFC ANALYSIS REVEALS COMPLEX PATTERN ACROSS SOUTH ARKANSAS...NORTH
TEXAS AND SOUTHEAST OKLAHOMA WITH OUTFLOW BOUNDARY/WARM FRONT
INTERSECTING WEAK COLD FRONT DEVELOPING SOUTH ACROSS THE RED RIVER
VALLEY. 20-30 KT SOUTHERLY LOW LEVEL WINDS ARE CAUSING ENOUGH
CONVERGENCE UPON THE BOUNDARIES AND PROVIDING SUFFICIENT LIFT FOR
THUNDERSTORMS IN VERY UNSTABLE AIRMASS WHERE CAPE VALUES ARE AROUND
3000 J/KG. WITH WEAK MID LEVEL WINDS THE STORMS ARE RATHER SLOW
MOVING. EXCESSIVE CONVECTIVE RAINFALL MAY POSE A FLOODING
THREAT...BUT HEAVIEST RAINFALL SHOULD SHIFT EAST AND DECREASE BY
LATE MORNING. WILL KEEP HEAVY RAINFALL IN WORDING AND RISK OF SEVERE
IN ZONES.

ETA INDICATES WEAK HIGH PRESSURE WILL MOVE OVER AREA FRIDAY WITH
AT WORST PARTLY CLOUDY SKIES. AVN INDICATING A SECOND FRONT
WILL MOVE THROUGH THE FORECAST AREA SATURDAY WITH A SHORT WAVE
FRIDAY NIGHT PRODUCING SIGNIFICANT RAINFALL OVERNIGHT BUT ETA AND
NGM SHOWING MAIN SHORT WAVE UP NORTH WITH ONLY CHANCE
PRECIPITATION...MAINLY SOUTHERN ARKANSAS AND SOUTHEAST OKLAHOMA.
WILL LEAVE FRIDAY NIGHT FORECAST THE SAME.

PRELIMINARY NUMBERS SUBJECT TO CHANGE...09

SHV 85/65/87/64 5212
MLU 84/66/86/67 6311
TXK 82/63/85/63 7213
TYR 84/63/87/68 6213
LFK 87/67/89/69 5312

.SHV.O..NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 12:30 AM CDT	Severe Thunderstorm Warning	SHV	Cass	30 min
May 31, 5:33 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison	57 min
May 30, 9:24 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne	51 min
May 30, 9:39 PM CDT	Severe Thunderstorm Warning	SHV	Union	51 min
May 30, 10:29 PM CDT	Severe Thunderstorm Warning	SHV	Union	46 min
May 31, 6:17 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Webster	58 min
May 30, 7:36 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead	54 min
May 31, 1:35 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead	55 min
May 31, 1:40 AM CDT	Severe Thunderstorm Warning	SHV	Union	65 min
May 31, 1:48 AM CDT	Severe Thunderstorm Warning	SHV	Nevada	57 min
May 31, 3:41 AM CDT	Severe Thunderstorm Warning	SHV	Columbia	64 min
May 31, 4:45 AM CDT	Flash Flood Warning	SHV	Columbia, Union	6 hr

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.