Alert archive / Texas / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 45, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Apr 13, 1987, 9:20 AM CDT for Cass County, Harrison County, Marion County, Texas. It was in force for 2 hr. 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
- Apr 13, 1987, 9:20 AM CDT (14:20 UTC)
- Expired
- Apr 13, 1987, 11:40 AM CDT
- In force
- 2 hr
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
Counties Cass County, TX, Harrison County, TX, Marion County, TX
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
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 13, 10:58 AM CDT | Hail 0.75 | Harrison, TX | |
| Apr 13, 11:05 AM CDT | Hail 1 | Harrison, TX | |
| Apr 13, 11:05 AM CDT | Hail 1 | Marion, TX | |
| Apr 13, 11:15 AM CDT | Hail 1 | Cass, TX |
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, 2.3 hours before the alert went out and 56 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
- 1954 J/kg
- Mixed-layer CIN
- -139 J/kg
- Mixed-layer LCL
- 590 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 154 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.8
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, Apr 13, 7:30 AM CDT, 1 hour 50 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 725 AM CDT MON APR 13 1987 ...SHOWERS AND THUNDERSTORMS INCREASING OVER NORTHEAST TEXAS AND SOUTHWEST ARKANSAS..MOVING INTO NORTHWEST LOUISIANA... AT 725 AM CDT THE WEATHER SERVICE RADAR IN SHREVEPORT WAS INDICATING AN AREA OF SHOWERS AND THUNDERSTORMS 50 MILES WIDE THAT EXTENDED FROM NEAR NACOGDOCHES TEXAS NORTH TO JUST WEST OF TEXARKANA TO MT IDA ARKANSAS. THE INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST AT NEAR 35 MPH WHILE THE AREA WAS MOVING EASTWARD AT 15 TO 20 MPH. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE TO SPREAD EAST INTO SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA. A SEVERE THUNDERSTORM WATCH CONTINUES INV EFFECT FOR PORTIONS OF SOUTH- EAST OKLAHOMA AND SOUTHWEST ARKANSAS UNTIL 11 AM THIS MORNING.
Special weather statement, Apr 13, 8:12 AM CDT, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 810 AM CDT MON APR 13 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 200 PM FOR PARTS OF SOUTHWEST ARKANSAS..NORTHWEST LOUISIANA..AND A LARGE PART OF EAST TEXAS... AT 805 AM WEATHER SERVICE RADAR IN SHREVEPORT SHOWED AN AREA OF SHOWERS AND STRONG THUNDERSTORMS OVER NORTHEAST TEXAS..SOUTHWEST ARKANSAS..AND NORTHWEST LOUISIANA. THE AREA..ABOUT 50 MILES WIDE.. STRECTCHED FROM NEAR MURFREESBORO ARKANSAS SOUTHWEST TO NEAR FOUKE ARKANSAS THEN ACROSS EAST TEXAS AND NORTHWEST LOUISIANA TO NEAR CENTER TEXAS. THE STRONGER THUNDERSTORMS WERE INDICATED NEAR ASHDOWN AND LOCKSBURG ARKANSAS...CARTHAGE TEXAS..AND VIVIAN LOUISIANA. THE THUNDERSTORMS NEAR ASHDOWN ARKANSAS SHOWED THE POSSIBILITY OF HAIL. THE SHOWERS AND THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 35 MPH AND THE AREA WAS MOVING TO THE EAST AT 20 MPH.
Special weather statement, Apr 13, 9:07 AM CDT, 13 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 905 AM CST MON APR 13 1987 TORNADO WATCH IN EFFECT FOR A LARGE AREA...INCLUDING MUCH OF NORTHEAST TEXAS...AND A SMALL PART OF SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA. AT 905 AM CST THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT WAS SHOW- ING A AREA OF SHOWERS AND THUNDERSTORMS OVER SOUTHWEST ARKANSAS..EXTEND- ING SOUTHWEST ACROSS NORTHWEST LOUISIANA TO THE TOLEOD BEND COUNTRY. WITHIN THE AREA OF SHOWERS AND THUNDERSTORMS...STRONG THUNDERSTORMS HAVE DEVELOPED OVER SOUTHWEST ARKANSAS AND EXTREME NORTHWEST LOUISIANA. THE STRONG THUNDERSTORMS WERE NORTH AND SOUTH OF MURFREESBORO IN SOUTHWEST ARKANSAS..ALSO 10 MILES SOUTHEAST OF TEXARKANA AND 25 MILES NORTH OF SHREVEPORT. THE STRONG THUNDERSTRORMS WILL LIKELY PRODUCE HEAVY RAINFALL ...STRONG GUSTY WINDS AND HAIL. MOVMENT WAS TOWARD THE NORTH NORTHEAST AT 35 MPH. . TO THE WEST...A LINE OF SEVERE STORMS WERE MOVING EAST ACROSS NORTH- CENTRAL TEXAS. THE LINE WAS LOCATED AT 905 AM CST FROM WEST OF GAAINS- VILLE TEXAS TO WEST OF COLLEGE STATION. THE SYSTEM WILL SPREAD EAST AT 30 TO 40 MPH AND PRODUCE SEVERE STORMS ACROSS NORTHEAST TEXAS THIS MORNING..AND AFFECT SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA THIS AFTERNOON.
Special weather statement, Apr 13, 9:18 AM CDT, 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 905 AM CDT MON APR 13 1987 TORNADO WATCH IN EFFECT FOR A LARGE AREA...INCLUDING MUCH OF NORTHEAST TEXAS...AND A SMALL PART OF SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA. AT 905 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT WAS SHOW- ING A AREA OF SHOWERS AND THUNDERSTORMS OVER SOUTHWEST ARKANSAS..EXTEND- ING SOUTHWEST ACROSS NORTHWEST LOUISIANA TO THE TOLEOD BEND COUNTRY. WITHIN THE AREA OF SHOWERS AND THUNDERSTORMS...STRONG THUNDERSTORMS HAVE DEVELOPED OVER SOUTHWEST ARKANSAS AND EXTREME NORTHWEST LOUISIANA. THE STRONG THUNDERSTORMS WERE NORTH AND SOUTH OF MURFREESBORO IN SOUTHWEST ARKANSAS..ALSO 10 MILES SOUTHEAST OF TEXARKANA AND 25 MILES NORTH OF SHREVEPORT. THE STRONG THUNDERSTRORMS WILL LIKELY PRODUCE HEAVY RAINFALL ...STRONG GUSTY WINDS AND HAIL. MOVMENT WAS TOWARD THE NORTH NORTHEAST AT 35 MPH. . TO THE WEST...A LINE OF SEVERE STORMS WERE MOVING EAST ACROSS NORTH- CENTRAL TEXAS. THE LINE WAS LOCATED AT 905 AM CDT FROM WEST OF GAAINS- VILLE TEXAS TO WEST OF COLLEGE STATION. THE SYSTEM WILL SPREAD EAST AT 30 TO 40 MPH AND PRODUCE SEVERE STORMS ACROSS NORTHEAST TEXAS THIS MORNING..AND AFFECT SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA THIS AFTERNOON.
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 12:20 PM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 85 min |
| Apr 13, 12:20 PM CDT | Severe Thunderstorm Warning | SHV | Bossier | 85 min |
| Apr 13, 1:25 PM CDT | Tornado Warning | SHV | Bossier, Claiborne, Webster | 75 min |
| Apr 13, 2:10 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Jackson, Lincoln, Union | 70 min |
| Apr 13, 2:40 PM CDT | Severe Thunderstorm Warning | SHV | Natchitoches, Sabine | 70 min |
| Apr 13, 3:20 PM CDT | Severe Thunderstorm Warning | SHV | Jackson, Morehouse, Ouachita, Union | 80 min |
| Apr 13, 3:20 PM CDT | Severe Thunderstorm Warning | SHV | Winn | 80 min |
| Apr 13, 4:35 PM CDT | Severe Thunderstorm Warning | SHV | East Carroll, Richland, West Carroll | 70 min |
| Apr 13, 9:20 AM CDT | Severe Thunderstorm Warning | SHV | Gregg, Rusk | 2 hr |
| Apr 13, 10:50 AM CDT | Severe Thunderstorm Warning | SHV | Bowie | 80 min |
| Apr 13, 11:35 AM CDT | Severe Thunderstorm Warning | SHV | Harrison, Marion | 75 min |
| Apr 13, 11:35 AM CDT | Severe Thunderstorm Warning | SHV | Panola, Shelby | 75 min |
| Apr 13, 10:50 AM CDT | Severe Thunderstorm Warning | SHV | Miller | 80 min |
| Apr 13, 11:35 AM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Miller | 75 min |
| Apr 13, 1:15 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Nevada | 65 min |
Nearby
Severe Thunderstorm Warnings in Texas, 1987Every severe thunderstorm warning in 1987
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.