Alert archive / Arkansas / Flash Flood Warnings in 2020

Flash Flood Warning 62, NWS Little Rock, AR

August 12, 20204 counties in Arkansas

NWS Little Rock, AR issued this flash flood warning at Aug 12, 2020, 3:28 AM CDT for 4 counties in Arkansas. It was in force for 7 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
Aug 12, 2020, 3:28 AM CDT (08:28 UTC)
Expired
Aug 12, 2020, 10:25 AM CDT
In force
7 hr
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Flood severity
None

Counties Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR

The radar

The Western Arkansas radar (KSRX), 96 km from the middle of the area, began a volume at 08:32 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

Shreveport, LA (KSHV), launched 00:00Z, 8.5 hours before the alert went out and 226 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, Shreveport, LA at 00:00Z on 2020-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1359 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, Shreveport, LA at 00:00Z on 2020-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 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
1359 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1735 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Aug 11, 2:31 PM CDT, 12 hours 57 minutes earlier.

Area forecast discussion, Aug 11, 2:31 PM CDT, 12 hours 57 minutes before
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Hazardous weather outlook, Aug 11, 4:15 AM CDT, 23 hours 13 minutes before
Hazardous Weather Outlook
National Weather Service Little Rock AR
415 AM CDT Tue Aug 11 2020

ARZ003>008-012>017-021>025-030>034-037>047-052>057-062>069-121000-
Boone-Marion-Baxter-Fulton-Sharp-Randolph-Newton-Searcy-Stone-
Izard-Independence-Lawrence-Johnson-Pope-Van Buren-Cleburne-
Jackson-Logan-Conway-Faulkner-White-Woodruff-Scott-Yell-Perry-
Polk-Montgomery-Garland-Saline-Pulaski-Lonoke-Prairie-Monroe-Pike-
Clark-Hot Spring-Grant-Jefferson-Arkansas-Dallas-Cleveland-
Lincoln-Desha-Ouachita-Calhoun-Bradley-Drew-
415 AM CDT Tue Aug 11 2020

This Hazardous Weather Outlook is for a Large Part of Arkansas.

.DAY ONE...Today and Tonight

Showers and thunderstorms will be possible late this morning and
into the evening hours over the majority of the state. Some storms
may be strong to possibly severe with the primary hazard being
strong winds.

Unseasonably hot conditions will continue this afternoon with
high temperatures in the lower to mid 90s for most locations.
Widespread heat index values in excess of 100 degrees are expected
with a few areas possibly reaching 105 degrees for a brief period
of time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Hot and humid conditions will continue through the end of the week,
with chances for mainly afternoon showers and thunderstorms. While
organized severe is not anticipated, a few stronger storms can not
be ruled out. the primary concern with any strong storm would be
gusty winds.

.Spotter Information Statement...

Spotter activation will not be needed.

&&

Visit NWS Little Rock on the web. Go to http://weather.gov/lzk.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 2:23 AM CDTSpecial Weather StatementLZKPolk52 min
Aug 12, 5:37 AM CDTFlash Flood WarningLZKCalhoun, Clark, Cleveland, Dallas, Garland, Hot Spring and 3 more3 hr
Aug 12, 7:34 AM CDTFlash Flood WarningLZKCalhoun, Ouachita116 min
Aug 12, 10:28 AM CDTFlash Flood Warning Considerable damage threatLZKPolk, Scott117 min
Aug 12, 12:39 PM CDTAreal Flood WarningLZKPolk, Scott3 hr

Nearby

Flash Flood Warnings in Arkansas, 2020Every flash flood warning in 2020

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.