Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 16, NWS New Orleans, LA

January 22, 1999East Baton Rouge Parish, West Baton Rouge Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jan 22, 1999, 3:51 PM CST for East Baton Rouge Parish, West Baton Rouge Parish, Louisiana. It was in force for 49 min. 3 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: Jan 22, 1999, 3:51 PM CST (21:51 UTC)
Expired: Jan 22, 1999, 4:40 PM CST
In force: 49 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties East Baton Rouge Parish, LA, West Baton Rouge Parish, LA

What was reported inside it

Time	Report	Where	Remark
Jan 22, 4:00 PM CST	Hail 0.75	Baton Rouge, LA	Hail 0.75 inch in diamater was reported at Louisiana State University by the campus police.
Jan 22, 4:05 PM CST	Thunderstorm Wind	Erwinville, LA	The West Baton Rouge Parish Sheriff's Office reported that several trees and tree limbs were blown down.
Jan 22, 4:05 PM CST	Thunderstorm Wind	Brusly, LA	A few trees and power lines were blown 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jan 22, 9:45 AM CST	Tornado Watch	SPC	6 hr
Jan 22, 3:00 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.9 hours before the alert went out and 147 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: 1281 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 386 m²/s²
0-3 km storm-relative helicity: 445 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 12.2

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.

In the hours before

Special weather statement, Jan 22, 9:57 AM CST, 5 hours 54 minutes before

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-230300-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
957 AM CST FRI JAN 22 1999

...A PARTICULARLY DANGEROUS SEVERE THUNDERSTORM DAY IS EXPECTED
   TODAY...

...A TORNADO WATCH IS IN EFFECT FOR ALL OF SOUTHEAST LOUISIANA AND
   SOUTHERN MISSISSIPPI UNTIL 4 PM CST...

A VERY UNSTABLE AIRMASS WITH MOIST AIR OFF THE GULF AND STRONG
SOUTHERLY WINDS WILL PROVIDE A FAVORABLE ENVIRONMENT FOR SEVERE
THUNDERSTORMS THIS AFTERNOON. THE FOLLOWING THREATS ARE EXPECTED...

TIME OF THREAT: FROM 11 AM CST THROUGH 9 PM CST.

TORNADOES...SEVERAL F0 TO F1 TORNADOES WITH ISOLATED VIOLENT (F2-F4)
            TORNADOES POSSIBLE FROM SUPERCELLS.

HAIL...SIZES RANGING FROM MARBLE TO GOLF BALL.

WIND...SUSTAINED WINDS SOUTHEAST 20 TO 30 MPH AND GUSTY OUTSIDE
       THUNDERSTORMS. IN THUNDERSTORM SQUALLS GUSTS 50-70 MPH
       WITH DAMAGING GUSTS TO 90 MPH POSSIBLE FROM STRONGER STORMS.

RAINFALL...RATES OF 1.5 INCHES PER HOUR. LOCALIZED ACCUMULATIONS
           OF 3 TO 5 INCHES POSSIBLE.

ACTIONS...EMERGENCY OPERATIONS SHOULD STAFF ACCORDINGLY FOR BUSY
          WEATHER OPERATIONS. EMERGENCY RESPONSE UNITS AT THE READY.
          ACTIVATION OF SPOTTERS AND HAM RADIO OPERATIONS. RELAY ANY
          WEATHER REPORTS TO THE NATIONAL WEATHER SERVICE.

HAM RADIO OPERATORS...REPORT WEATHER INFORMATION TO THE PACKET SYSTEM
          CALL SIGN W5SLA-5  NWSSIL  FREQUENCY 145.015 VIA SILQSO.

PUBLIC...REVIEW ALL SAFETY PROCEDURES AND HAVE A PLAN OF ACTION.
         LISTEN TO ALL STATEMENTS AND WARNINGS ON TV AND RADIO.
         BE PREPARED TO TAKE COVER WHEN A WARNING IS ISSUED. REPORT
         ANY SEVERE WEATHER DAMAGE TO YOUR SHERIFFS OFFICE.

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 22, 2:50 PM CST	Severe Thunderstorm Warning	LIX	West Feliciana	30 min
Jan 22, 3:33 PM CST	Severe Thunderstorm Warning	LIX	Iberville	32 min
Jan 22, 4:05 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Livingston, Saint Helena	35 min
Jan 22, 4:40 PM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa	45 min
Jan 22, 5:33 PM CST	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Saint James	42 min
Jan 22, 5:46 PM CST	Severe Thunderstorm Warning	LIX	Livingston	34 min
Jan 22, 5:55 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	30 min
Jan 22, 3:06 PM CST	Tornado Warning	LIX	Wilkinson	34 min
Jan 22, 5:07 PM CST	Tornado Warning	LIX	Pike	33 min
Jan 22, 5:18 PM CST	Tornado Warning	LIX	Walthall	32 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1999 Every severe thunderstorm warning in 1999

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.