Alert archive / Arkansas / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS Little Rock, AR

April 24, 1999Monroe County, Arkansas

NWS Little Rock, AR issued this flash flood warning at Apr 24, 1999, 11:09 AM CDT for Monroe County, Arkansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 24, 1999, 11:09 AM CDT (16:09 UTC)
Expired
Apr 24, 1999, 2:10 PM CDT
In force
3 hr
Issued by
NWS Little Rock, AR
Area
Whole counties

County Monroe County, AR

The radar

The Little Rock radar (KLZK), 98 km from the middle of the area, began a volume at 16:12 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

Little Rock, AR (KLZK), launched 12:00Z, 4.2 hours before the alert went out and 116 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 12:00Z on 1999-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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 12:00Z on 1999-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 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
53 J/kg
Mixed-layer CIN
-618 J/kg
Mixed-layer LCL
804 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLIT 241608
FFWLIT
ARC095-241910-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1109 AM CDT SAT APR 24 1999

THE NATIONAL WEATHER SERVICE IN LITTLE ROCK HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN MONROE COUNTY IN EASTERN ARKANSAS

* UNTIL 210 PM CDT

* DOPPLER WEATHER RADAR INDICATED THAT RAINFALL AMOUNTS OF 2 INCHES OR
  MORE OCCURRED IN SOUTHERN MONROE COUNTY BETWEEN 10 AM AND 11 AM.
  ADDITIONAL HEAVY RAINFALL WILL AFFECT THE AREA FOR THE NEXT FEW
  HOURS.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD! THE WATER DEPTH
MAY BE TOO GREAT FOR SAFE PASSAGE. IT ONLY TAKES ABOUT TWO FEET OF
MOVING WATER TO CARRY A CAR DOWNSTREAM.

22




The office that day

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

IssuedProductOfficeCountiesLasted
Apr 24, 8:00 AM CDTSevere Thunderstorm WarningLZKMonroe35 min
Apr 24, 9:07 AM CDTSevere Thunderstorm WarningLZKLogan48 min
Apr 24, 10:16 AM CDTSevere Thunderstorm WarningLZKLogan64 min
Apr 24, 10:21 AM CDTSevere Thunderstorm WarningLZKScott64 min
Apr 24, 11:01 AM CDTFlash Flood WarningLZKScott119 min
Apr 24, 11:15 AM CDTSevere Thunderstorm WarningLZKYell65 min
Apr 24, 11:26 AM CDTSevere Thunderstorm WarningLZKMontgomery64 min
Apr 24, 11:38 AM CDTFlash Flood WarningLZKLonoke3 hr
Apr 24, 11:59 AM CDTSevere Thunderstorm WarningLZKPerry, Saline51 min
Apr 24, 12:53 PM CDTTornado WarningLZKPike47 min
Apr 24, 2:02 PM CDTSevere Thunderstorm WarningLZKGrant48 min
Apr 24, 2:23 PM CDTSevere Thunderstorm WarningLZKJefferson62 min

Nearby

Flash Flood Warnings in Arkansas, 1999Every flash flood 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.