Alert archive / Arkansas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 579, NWS Jackson, MS

August 9, 1999Ashley County, Arkansas

NWS Jackson, MS issued this severe thunderstorm warning at Aug 9, 1999, 6:48 PM CDT for Ashley County, Arkansas. It was in force for 47 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: Aug 9, 1999, 6:48 PM CDT (23:48 UTC)
Expired: Aug 9, 1999, 7:35 PM CDT
In force: 47 min
Issued by: NWS Jackson, MS
Area: Whole counties

County Ashley County, AR

The radar

The Little Rock radar (KLZK), 189 km from the middle of the area, began a volume at 23:52 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.

What was reported inside it

Time	Report	Where	Remark
Aug 9, 7:10 PM CDT	Thunderstorm Wind	Crossett, AR	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 nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.8 hours before the alert went out and 185 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: 3127 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, Aug 9, 5:15 PM CDT, 1 hour 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
515 PM CDT MON AUG 09 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....PARISH/COUNTY LOCATION....

0235 PM    5 W MERIDIAN              MS   WIND DAMAGE
08/09/99   LAUDERDALE                     ROOF BLOWN OFF OF A
                                          BARN...REPORTED BY
                                          LAUDERDALE EOC

0455 PM    FOREST                    MS   WIND DAMAGE
08/09/99   SCOTT                          TWO TREES BLOWN DOWN ACROSS
                                          CITY STREET...REPORTED BY
                                          CITY HALL

Local storm report, Aug 9, 5:15 PM CDT, 1 hour 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
515 PM CDT MON AUG 09 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....PARISH/COUNTY LOCATION....

0235 PM    5 W MERIDIAN              MS   WIND DAMAGE
08/09/99   LAUDERDALE                     ROOF BLOWN OFF OF A
                                          BARN...REPORTED BY
                                          LAUDERDALE EOC

0455 PM    FOREST                    MS   WIND DAMAGE
08/09/99   SCOTT                          TWO TREES BLOWN DOWN ACROSS
                                          CITY STREET...REPORTED BY
                                          CITY HALL

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 4:32 PM CDT	Severe Thunderstorm Warning	JAN	Scott	28 min
Aug 9, 5:55 PM CDT	Severe Thunderstorm Warning	JAN	Hinds, Madison, Rankin	35 min
Aug 9, 6:11 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Jefferson Davis, Simpson	34 min
Aug 9, 6:27 PM CDT	Severe Thunderstorm Warning	JAN	Hinds, Rankin	33 min
Aug 9, 6:41 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Jefferson Davis, Simpson	34 min
Aug 9, 6:53 PM CDT	Severe Thunderstorm Warning	JAN	Lawrence	37 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 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; radar from the NEXRAD Level II archive.