Alert archive / Arkansas / Flash Flood Warnings in 1999

Flash Flood Warning 32, NWS Little Rock, AR

May 12, 1999Johnson County, Arkansas

NWS Little Rock, AR issued this flash flood warning at May 12, 1999, 1:50 AM CDT for Johnson 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
May 12, 1999, 1:50 AM CDT (06:50 UTC)
Expired
May 12, 1999, 4:55 AM CDT
In force
3 hr
Issued by
NWS Little Rock, AR
Area
Whole counties

County Johnson County, AR

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.8 hours before the alert went out and 151 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, Springfield, MO at 00:00Z on 1999-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1007 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, Springfield, MO at 00:00Z on 1999-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
1007 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1168 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
83 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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 1:24 AM CDTSevere Thunderstorm WarningLZKJohnson36 min
May 12, 2:44 AM CDTSevere Thunderstorm WarningLZKClark31 min
May 12, 2:47 AM CDTFlash Flood WarningLZKLogan2 hr
May 12, 5:06 PM CDTSevere Thunderstorm WarningLZKLonoke49 min
May 12, 6:30 PM CDTSevere Thunderstorm WarningLZKBaxter, Stone35 min
May 12, 6:48 PM CDTSevere Thunderstorm WarningLZKIzard47 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.