Alert archive / Louisiana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 110, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at May 31, 2001, 6:17 AM CDT for Bienville Parish, Claiborne Parish, Webster Parish, Louisiana. It was in force for 58 min. 2 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, 6:17 AM CDT (11:17 UTC)
- Expired
- May 31, 2001, 7:15 AM CDT
- In force
- 58 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
Counties Bienville Parish, LA, Claiborne Parish, LA, Webster Parish, LA
The radar
The Shreveport radar (KSHV), 70 km from the middle of the area, began a volume at 11:19 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, 6:25 AM CDT | Thunderstorm Wind 52 E | Sibley, LA | Several large oak trees down. |
| May 31, 6:30 AM CDT | Thunderstorm Wind 55 E | Ringgold, LA | Several large oak trees down. |
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, 11.3 hours before the alert went out and 60 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
- 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
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, 3 hours 17 minutes earlier.
Area forecast discussion, May 31, 3:00 AM CDT, 3 hours 17 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 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, 5:40 AM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo, De Soto | 65 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2001Every 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.