Alert archive / Arkansas / Flash Flood Watches in 2021

Flash Flood Watch 6, NWS Little Rock, AR

July 18, 202124 counties in Arkansas

NWS Little Rock, AR issued this flash flood watch at Jul 18, 2021, 4:57 AM CDT for 24 counties in Arkansas. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Jul 18, 2021, 4:57 AM CDT (09:57 UTC)
Expired: Jul 18, 2021, 2:47 PM CDT
In force: 10 hr
Issued by: NWS Little Rock, AR
Flood severity: None

All 24 counties

Arkansas County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jackson County, AR, Jefferson County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Perry County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, White County, AR, Woodruff County, AR

The radar

The Little Rock radar (KLZK), 30 km from the middle of the area, began a volume at 09:57 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 00:00Z, 10.0 hours before the alert went out and 297 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: 346 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -60 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Jul 17, 6:45 PM CDT, 10 hours 12 minutes earlier.

Area forecast discussion, Jul 17, 6:45 PM CDT, 10 hours 12 minutes before

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Hazardous weather outlook, Jul 17, 10:56 AM CDT, 18 hours 1 minute before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 9:27 PM CDT	Special Weather Statement	LZK	Lincoln	33 min
Jul 18, 2:17 AM CDT	Flash Flood Warning	LZK	Cleburne, Van Buren	89 min
Jul 18, 2:32 AM CDT	Special Weather Statement	LZK	White	58 min
Jul 18, 10:59 AM CDT	Special Weather Statement	LZK	Cleveland	46 min
Jul 18, 11:34 AM CDT	Special Weather Statement	LZK	Calhoun	41 min
Jul 18, 11:50 AM CDT	Special Weather Statement	LZK	Drew, Lincoln	40 min
Jul 18, 12:37 PM CDT	Special Weather Statement	LZK	Desha, Drew	38 min

Nearby

Flash Flood Watches in Arkansas, 2021 Every flash flood watch in 2021

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.