Alert archive / Arkansas / Tornado Warnings in 1999

Tornado Warning 99, NWS Memphis, TN

February 7, 1999Mississippi County, Arkansas

NWS Memphis, TN issued this tornado warning at Feb 7, 1999, 12:51 AM CST for Mississippi County, Arkansas. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 7, 1999, 12:51 AM CST (06:51 UTC)
Expired
Feb 7, 1999, 1:25 AM CST
In force
34 min
Issued by
NWS Memphis, TN
Area
Whole counties

County Mississippi County, AR

The radar

The Memphis radar (KNQA), 49 km from the middle of the area, began a volume at 06:55 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Feb 7, 12:15 AM CSTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 6.9 hours before the alert went out and 104 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, Little Rock, AR at 00:00Z on 1999-02-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 179 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, Little Rock, AR at 00:00Z on 1999-02-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 square meters per square second.19395878Sfc1 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
179 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
726 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
213 m²/s²
Significant tornado parameter
0.2
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KMEM 070652 RRA
TORMEM
ARC093-070725-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
1251 AM CST SUN FEB 7 1999


THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* TORNADO WARNING FOR...
  MISSISSIPPI COUNTY IN NORTHEASTERN ARKANSAS

* UNTIL 125 AM CST

* AT 1250 AM CST... DOPPLER RADAR INDICATED A TORNADO
  NEAR BASSETT MOVING NORTHEAST AT 40 MILES AN HOUR.

* THE TORNADO WILL BE NEAR...
  WILSON BY 100 AM CST
  OSCEOLA BY 105 AM CST

.WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR
ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS
PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 6, 11:51 PM CSTSevere Thunderstorm WarningMEGPoinsett44 min
Feb 7, 12:04 AM CSTSevere Thunderstorm WarningMEGCross46 min
Feb 7, 12:07 AM CSTSevere Thunderstorm WarningMEGSt. Francis48 min
Feb 7, 12:32 AM CSTSevere Thunderstorm WarningMEGCrittenden, Mississippi48 min

Nearby

Tornado Warnings in Arkansas, 1999Every tornado warning in 1999Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.