Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 166, NWS Shreveport, LA

May 27, 1990Bossier Parish, Caddo Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 27, 1990, 12:35 PM CDT for Bossier Parish, Caddo Parish, Louisiana. It was in force for 55 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
May 27, 1990, 12:35 PM CDT (17:35 UTC)
Expired
May 27, 1990, 1:30 PM CDT
In force
55 min
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Bossier Parish, LA, Caddo Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
May 27, 12:50 PM CDTThunderstorm Wind 0Caddo, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 12:00Z, 5.6 hours before the alert went out and 86 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-pSkew-T log-p diagram, Longview/Gregg, TX at 12:00Z on 1990-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2613 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Longview/Gregg, TX at 12:00Z on 1990-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2613 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
1.7
Supercell composite
6.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 271735
SVRSHV
LAC015-017-271830-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1235 PM CDT SUN MAY 27 1990
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS..
 
IN NORTHWEST LOUISIANA
 
   ...BOSSIER PARISH...CADDO PARISH
 
AT 1233 PM CDT WEATHER SERVICE RADAR IN SHREVEPORT INDICATED A SEVERE
THUNDERSTORMS OVER WESTERN CADDO PARISH JUST NORTHWEST OF SHREVEPORT
MOVING TO THE SOUTHEAST AT 30 MPH. THIS STORM HAD INCREASED IN THE
LAST HOUR.
 
WINDS TO NEAR 60 MPH POSSIBLE WITH THIS STORM.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, May 27, 6:48 AM CDT, 5 hours 47 minutes before
OKZ026-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-002-
003-004-005-006-271300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
645 AM CDT SUN MAY 27 1990

...SEVERE THUNDERSTORM WATCHES REMAINED IN EFFECT FOR PARTS OF SOUTH
ARKANSAS AND NORTH LOUISIANA..BUT THE WATCH FOR NORTHEAST TEXAS HAS
BEEN CANCELLED...

AT 640 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
A 60 MILE WIDE BAND OF SHOWERS AND THUNDERSTORMS THAT EXTENDED FROM
NEAR MANSFIELD LOUISIANA ACROSS MINDEN LOUISIANA AND EL DORADO ARKANSAS
TO NEAR SHERIDAN ARKANSAS. MOVEMENT WAS EAST SOUTHEAST NEAR 35 MILES AN
HOUR.

WITHIN THE AREA HEAVY RAINS..PEA SIZE HAIL..GUSTY WINDS OF 35 TO 45 MPH
AND FREQUENT LIGHTNING WERE NOTED FROM EAST OF HOMER LOUISIANA TO
SOUTHWEST OF ELDORADO ARKANSAS.
.
IN THE WAKE OF THIS SYSTEM...SHOWERS AND THUNDERSTORMS WERE
REDEVELOPING IN A 30 MILE WIDE AREA FROM NEAR ANTOINE ARKANSAS
ACROSS LAKE GREESON AND SMITHVILLE OKLAHOMA TO NEAR MCALESTER
OKLAHOMA. WITHIN THIS AREA A THUNDERSTORM THAT WAS PRODUCING
GUSTY WINDS...HEAVY RAINS AND FREQUENT LIGHTNING WAS NOTED SOUTH
OF SMITHVILLE OKLAHOMA. MOVEMENT WAS EAST SOUTHEAST NEAR 35 MILES
AN HOUR.

LOW AREA FLOODING MAY DEVELOP IN THE AREAS THAT RECEIVED ONE TO
TWO INCH TOTALS DURING THE WEE HOURS AND THAT THUNDERSTORMS ONCE
AGAIN AFFECT THIS MORNING.

ANOTHER AREA ABOUT 50 MILES WIDE OF SHOWERS AND THUNDERSHOWERS WAS
WAS NOTED FROM NEAR GEORGETOWN LOUISIANA ACROSS BASTROP LOUISIANA
TO NEAR LAKE VILLAGE ARKANSAS. MOVEMENT WAS EAST NEAR 20 MILES
AN HOUR.

ALSO ISOLATED SHOWERS LINGERED EAST OF LUFKIN TEXAS.

ALONG WITH THE THREAT FOR HIGH WINDS AND HAIL...HEAVY RAINS ARE
LIKELY THROUGHE TONIGHT OVER PARTS OF THE AREA.

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 12:50 PM CDTSevere Thunderstorm WarningSHVDe Soto85 min
May 27, 2:00 PM CDTSevere Thunderstorm WarningSHVBienville, Natchitoches, Red River, Sabine, Winn90 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1990Every severe thunderstorm warning in 1990

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.