Alert archive / Arkansas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 322, NWS Little Rock, AR

July 21, 20185 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jul 21, 2018, 4:24 AM CDT for 5 counties in Arkansas. It was in force for 51 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: Jul 21, 2018, 4:24 AM CDT (09:24 UTC)
Expired: Jul 21, 2018, 5:15 AM CDT
In force: 51 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Conway County, AR, Logan County, AR, Perry County, AR, Pope County, AR, Yell County, AR

The radar

The Little Rock radar (KLZK), 90 km from the middle of the area, began a volume at 09:26 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 21, 2:33 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 9.4 hours before the alert went out and 200 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: 69 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 2856 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -60 m²/s²
0-3 km storm-relative helicity: -32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

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 Jul 21, 4:18 AM CDT, 6 minutes earlier.

Area forecast discussion, Jul 21, 4:18 AM CDT, 6 minutes before

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Hazardous weather outlook, Jul 20, 6:37 PM CDT, 9 hours 47 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Little Rock AR
637 PM CDT Fri Jul 20 2018

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-211100-
Boone-Marion-Baxter-Fulton-Sharp-Newton-Searcy-Stone-Izard-
Independence-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-
637 PM CDT Fri Jul 20 2018

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

.DAY ONE...Tonight

Heat index values will remain high early this evening...with many
areas seeing heat index values of 105 to just over 115. Expect
heat index values to cool off later this evening.

Some strong to severe thunderstorms will be possible this
evening...with the best chances across the north and northeast
sections of the area. Damaging winds and large hail will be the
primary threats expected...with locally heavy rainfall also
possible.

.DAYS TWO THROUGH SEVEN...Saturday Through Thursday

The chance for thunderstorms will diminish over the weekend...with
potential for some thunderstorms returning for Tuesday through
Thursday of next week.

Heat index values will remain a concern through much of the
period as well. Most locations will see heat index values in the
upper 90s to around 105 degrees. Some areas may see heat index
values exceed 105 degrees during the afternoon and evening hours.

.Spotter Information Statement...

Spotter activation will not be needed.

&&

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

In the hours before

Local storm report, Jul 21, 3:35 AM CDT, 49 minutes before

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Special weather statement, Jul 21, 4:00 AM CDT, 24 minutes before

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Local storm report, Jul 21, 4:01 AM CDT, 23 minutes before

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Local storm report, Jul 21, 4:11 AM CDT, 13 minutes before

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Local storm report, Jul 21, 4:19 AM CDT, 5 minutes before

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Special weather statement, Jul 21, 4:20 AM CDT, 4 minutes before

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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 20, 8:46 PM CDT	Special Weather Statement	LZK	Van Buren, White	44 min
Jul 20, 8:53 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Lonoke, Monroe, Prairie, Woodruff	52 min
Jul 20, 8:55 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Lonoke, Pulaski	50 min
Jul 20, 8:59 PM CDT	Special Weather Statement	LZK	Lonoke	31 min
Jul 20, 9:36 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe, Prairie	39 min
Jul 20, 9:37 PM CDT	Severe Thunderstorm Warning	LZK	Monroe	53 min
Jul 20, 9:44 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Jefferson, Lonoke, Prairie, Pulaski	46 min
Jul 20, 9:54 PM CDT	Tornado Warning	LZK	Arkansas, Monroe	36 min
Jul 20, 10:16 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe, Prairie	29 min
Jul 20, 10:19 PM CDT	Tornado Warning	LZK	Arkansas, Desha, Monroe	26 min
Jul 20, 10:27 PM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Pulaski	20 min
Jul 20, 10:43 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe, Prairie	32 min
Jul 20, 10:44 PM CDT	Special Weather Statement	LZK	Desha	31 min
Jul 20, 11:07 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe	23 min
Jul 20, 11:28 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Desha, Monroe	47 min
Jul 21, 12:02 AM CDT	Special Weather Statement	LZK	Phillips	43 min
Jul 21, 12:12 AM CDT	Special Weather Statement	LZK	Boone	48 min
Jul 21, 12:19 AM CDT	Severe Thunderstorm Warning	LZK	Boone, Marion, Newton, Searcy	41 min
Jul 21, 12:27 AM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Prairie	48 min
Jul 21, 12:48 AM CDT	Severe Thunderstorm Warning	LZK	Johnson, Newton	57 min
Jul 21, 12:53 AM CDT	Severe Thunderstorm Warning	LZK	Lonoke	37 min
Jul 21, 1:03 AM CDT	Severe Thunderstorm Warning	LZK	Marion, Newton, Pope, Searcy, Stone, Van Buren	46 min
Jul 21, 1:09 AM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe, Prairie	36 min
Jul 21, 1:14 AM CDT	Severe Thunderstorm Warning	LZK	Baxter, Marion, Searcy, Stone	46 min
Jul 21, 1:22 AM CDT	Severe Thunderstorm Warning	LZK	Cleburne, White	23 min
Jul 21, 1:29 AM CDT	Severe Thunderstorm Warning	LZK	Johnson, Logan	34 min
Jul 21, 1:36 AM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Independence, Pope, Van Buren	38 min
Jul 21, 1:38 AM CDT	Severe Thunderstorm Warning	LZK	Prairie, White, Woodruff	37 min
Jul 21, 1:40 AM CDT	Special Weather Statement	LZK	Pope	50 min
Jul 21, 1:51 AM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Prairie, White	24 min
Jul 21, 2:09 AM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Prairie, White	36 min
Jul 21, 2:13 AM CDT	Special Weather Statement	LZK	Faulkner, White	62 min
Jul 21, 2:23 AM CDT	Special Weather Statement	LZK	Perry	52 min
Jul 21, 2:48 AM CDT	Severe Thunderstorm Warning	LZK	Conway, Faulkner, Perry, Pulaski, Saline	57 min
Jul 21, 3:15 AM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe	45 min
Jul 21, 3:18 AM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Pulaski, Saline	27 min
Jul 21, 3:34 AM CDT	Special Weather Statement	LZK	Johnson	56 min
Jul 21, 3:39 AM CDT	Severe Thunderstorm Warning	LZK	Grant, Jefferson, Lonoke, Pulaski, Saline	51 min
Jul 21, 4:00 AM CDT	Special Weather Statement	LZK	Pope	45 min
Jul 21, 4:20 AM CDT	Special Weather Statement	LZK	Desha, Drew, Lincoln	55 min
Jul 21, 4:53 AM CDT	Special Weather Statement	LZK	Faulkner, Lonoke, Pulaski	52 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2018 Every severe thunderstorm warning in 2018

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.