Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 147, NWS Shreveport, LA

May 20, 1990East Carroll Parish, Richland Parish, West Carroll Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 20, 1990, 2:29 PM CDT for East Carroll Parish, Richland Parish, West Carroll Parish, Louisiana. It was in force for 61 min.

The area

The counties it named.

The facts

Issued
May 20, 1990, 2:29 PM CDT (19:29 UTC)
Expired
May 20, 1990, 3:30 PM CDT
In force
61 min
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties East Carroll Parish, LA, Richland Parish, LA, West Carroll Parish, LA

The radar

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

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.5 hours before the alert went out and 137 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, Jackson, MS at 12:00Z on 1990-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1382 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, Jackson, MS at 12:00Z on 1990-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
1382 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
636 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.8

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

Local storm report, May 20, 9:09 AM CDT, 5 hours 20 minutes before
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Special weather statement, May 20, 9:47 AM CDT, 4 hours 42 minutes before
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Local storm report, May 20, 10:44 AM CDT, 3 hours 45 minutes before
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Special weather statement, May 20, 11:31 AM CDT, 2 hours 58 minutes before
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Special weather statement, May 20, 11:34 AM CDT, 2 hours 55 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 12:15 PM CDTSevere Thunderstorm WarningSHVCaddo2 hr
May 20, 12:15 PM CDTSevere Thunderstorm WarningSHVBossier, Webster2 hr
May 20, 12:15 PM CDTSevere Thunderstorm WarningSHVDe Soto2 hr
May 20, 12:44 PM CDTSevere Thunderstorm WarningSHVBienville, Claiborne2 hr
May 20, 12:44 PM CDTSevere Thunderstorm WarningSHVRed River2 hr
May 20, 12:44 PM CDTSevere Thunderstorm WarningSHVSabine2 hr
May 20, 2:01 PM CDTSevere Thunderstorm WarningSHVJackson, Natchitoches, Winn119 min
May 20, 2:01 PM CDTSevere Thunderstorm WarningSHVLincoln, Ouachita, Union119 min
May 20, 2:01 PM CDTSevere Thunderstorm WarningSHVMorehouse119 min
May 20, 3:10 PM CDTSevere Thunderstorm WarningSHVFranklin, Madison, Tensas95 min
May 20, 3:10 PM CDTSevere Thunderstorm WarningSHVCaldwell95 min
May 19, 8:13 PM CDTSevere Thunderstorm WarningSHVCass62 min
May 19, 7:15 PM CDTSevere Thunderstorm WarningSHVHempstead, Pike60 min
May 19, 8:13 PM CDTSevere Thunderstorm WarningSHVHoward, Pike62 min
May 19, 9:15 PM CDTSevere Thunderstorm WarningSHVPike45 min
May 19, 10:00 PM CDTFlash Flood WarningSHVPike3 hr
May 19, 10:00 PM CDTSevere Thunderstorm WarningSHVPike3 hr
May 20, 1:00 AM CDTFlash Flood WarningSHVPike3 hr
May 20, 1:00 AM CDTSevere Thunderstorm WarningSHVNevada2 hr
May 20, 1:00 AM CDTSevere Thunderstorm WarningSHVPike3 hr
May 20, 2:20 AM CDTTornado WarningSHVLittle River, Sevier40 min
May 20, 4:09 AM CDTFlash Flood WarningSHVNevada, Pike3 hr

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; the sounding from the Mesonet's radiosonde archive.