Alert archive / Arkansas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 377, NWS Little Rock, AR

August 18, 2000Pulaski County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 18, 2000, 5:30 PM CDT for Pulaski County, Arkansas. It was in force for 40 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: Aug 18, 2000, 5:30 PM CDT (22:30 UTC)
Expired: Aug 18, 2000, 6:10 PM CDT
In force: 40 min
Issued by: NWS Little Rock, AR
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Pulaski County, AR

The radar

The Little Rock radar (KLZK), 9 km from the middle of the area, began a volume at 22:30 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.5 hours before the alert went out and 272 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: 75 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 488 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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.

NWS Little Rock, AR wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:00 PM CDT, 2 hours 30 minutes earlier.

Area forecast discussion, Aug 18, 3:00 PM CDT, 2 hours 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
300 PM CDT FRI AUG 18 2000

LOOKS LIKE ONLY A FEW AREAS WILL BENEFIT FROM THE COLD FRONT THAT IS
DRAPED ACROSS CENTRAL ARKANSAS. SCATTERED CONVECTION HAS NOW FORMED
OVER SOUTHERN ZONES...ALONG AND AHEAD OF THE FRONT. THINKING IS THAT
SCATTERED THUNDERSTORMS WILL PERSIST UNTIL AROUND SUNSET...THEN DIE
ONCE THE HEATING IS GONE. JUST DOES NOT SEEM TO BE ENOUGH UPPER
SUPPORT TO SUSTAIN THE CONVECTION AFTER SUNSET.

BIG TEMP DIFFERENCE ACROSS THE FRONT. STILL IN THE 70S WHERE CLOUDS
HAVE HUNG ON IN THE NORTH...BUT 100 TO 105 HAS BEEN COMMON CENTRAL
AND SOUTH...WITH HEAT INDEX VALUES FROM 110 TO 115. PRETTY MUCH THE
HIGHEST HEAT INDICES SO FAR THIS YEAR.

MODELS SEEM TO AGREE THAT THE FRONT WILL BE STATIONARY OVER THE AREA
SATURDAY...SO WILL HAVE TO LEAVE IN SMALL STORM CHANCES EVEN THOUGH
NGM MOS IS GIVING LESS THAN 20 PERCENT. WILL ALSO LEAVE 20 PERCENT
IN FOR SUN AS THE FRONT LIFTS BACK NORTH AS A WARM FRONT. NGM
SUGGESTS MCS TYPE CONVECTION MAY MAKE IN AS FAR SOUTH AS NORTH AR
SUN MORNING...BUT ET/AVN DO NOT SUPPORT THIS AND WILL NOT BITE QUITE
YET.

BACK TO THE HEAT BY EARLY NEXT WEEK AS UPPER RIDGE STRENGTHENS ONCE
AGAIN. WITH LITTLE RAIN EXPECTED THE NEXT CCOUPLE DAYS...IT WILL NOT
TAKE LONG TO GET READINGS BACK UP TO NEAR 100 OR SO NEXT WEEK. WILL
GO AT LEAST 5 DEGREES ABOVE FMR NUMBERS FOR MON-WED.

.LIT...NONE.

45

In the hours before

Local storm report, Aug 18, 5:20 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
520 PM CDT FRI AUG 18 2000

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

0430 PM    CLARKSVILLE               AR   WIND DAMAGE
08/18/00   JOHNSON                        SOME TREES BLOWN DOWN
                                          AROUND CLARKSVILLE. REPORT
                                          FROM JOHNSON COUNTY
                                          SHERIFFS OFFICE.

22

The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 3:55 PM CDT	Severe Thunderstorm Warning	LZK	Grant	35 min
Aug 18, 4:01 PM CDT	Severe Thunderstorm Warning	LZK	Jefferson	29 min
Aug 18, 4:21 PM CDT	Severe Thunderstorm Warning	LZK	Johnson	39 min
Aug 18, 5:02 PM CDT	Flash Flood Warning	LZK	Johnson	118 min
Aug 18, 5:09 PM CDT	Severe Thunderstorm Warning	LZK	Saline	36 min
Aug 18, 5:43 PM CDT	Severe Thunderstorm Warning	LZK	Saline	37 min
Aug 18, 5:49 PM CDT	Severe Thunderstorm Warning	LZK	Garland	41 min
Aug 18, 6:15 PM CDT	Severe Thunderstorm Warning	LZK	Montgomery, Pike	45 min
Aug 18, 6:26 PM CDT	Severe Thunderstorm Warning	LZK	Clark, Hot Spring	49 min
Aug 18, 6:26 PM CDT	Severe Thunderstorm Warning	LZK	Garland	49 min
Aug 18, 6:42 PM CDT	Severe Thunderstorm Warning	LZK	Garland	118 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2000 Every severe thunderstorm warning in 2000

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.