Alert archive / Arkansas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 182, NWS Little Rock, AR

May 19, 20174 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at May 19, 2017, 1:28 AM CDT for 4 counties in Arkansas. It was in force for 62 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
May 19, 2017, 1:28 AM CDT (06:28 UTC)
Expired
May 19, 2017, 2:30 AM CDT
In force
62 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Boone County, AR, Marion County, AR, Newton County, AR, Searcy County, AR

The radar

The Springfield radar (KSGF), 133 km from the middle of the area, began a volume at 06:30 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.

IssuedProductOfficeLasted
May 18, 10:58 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.5 hours before the alert went out and 118 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 2017-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2055 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 2017-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
2055 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1439 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.4

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 May 18, 10:34 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, May 18, 10:34 PM CDT, 2 hours 54 minutes before
Area Forecast Discussion...UPDATED
National Weather Service Little Rock AR
1034 PM CDT Thu May 18 2017

.UPDATE...
Have updated to increase rain chances over the area in the
northwest and far west tonight. 00Z upper level analysis shows a
degree of ridging still in place over Arkansas, but starting to
erode. Trough emenating from a closed upper low in the four
corners region and interacting with a strong surface system over
Oklahoma has allowed strong storms to develop and move
east/northeast. Based on their current trajectory and incoming
model data, these will likely clip our northwest half later
tonight. There will still be a severe threat, but this should wane
in the early morning hours as the storms weaken.
&&

.PREV DISCUSSION...(ISSUED 640 PM CDT Thu May 18 2017)

AVIATION...
Clouds will increase over the next 24 hours, as a storm system
approaches from the plains. Expect conditions to deteriorate by
early Friday morning, with MVFR ceilings developing. Some
improvement can be expected during the late morning and early
afternoon hours, similar to today. Precipitation chances are low-
confidence, except for maybe in the north.
&&

.LZK Watches/Warnings/Advisories...NONE.
&&

57
Hazardous weather outlook, May 19, 12:45 AM CDT, 43 minutes before
Hazardous Weather Outlook...Updated
National Weather Service Little Rock AR
1245 AM CDT Fri May 19 2017

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-191000-
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-
1245 AM CDT Fri May 19 2017

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

.DAY ONE...Tonight

The region will be between a ridge of high pressure over the
southeast United States and a front and stormy conditions in the
Plains.

Overnight, storms from Oklahoma will build into northwest Arkansas.
Some storms will be severe, with damaging winds the main concern. An
isolated tornado cannot be ruled out. Locally heavy rain will also
be noted, with amounts locally over an inch.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Not much will change on Friday. Hit and miss showers and a few
thunderstorms in the forecast, mainly in areas north and west of
Little Rock.

High pressure to the east will weaken Friday night and Saturday. The
front to the west will head toward Arkansas, with rain chances
increasing. Several rounds of thunderstorms are expected through the
weekend.

A few storms could become strong to severe. The stronger storms
could produce large hail and damaging winds. Locally heavy rainfall
will also occur. Thunderstorms will move out of the area Sunday
afternoon.

.Spotter Information Statement...

Spotter activation may be needed Friday night and Saturday.
&&

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

51/46

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 12:34 AM CDTSevere Thunderstorm WarningLZKJohnson, Logan, Scott56 min
May 19, 12:55 AM CDTSevere Thunderstorm WarningLZKBoone, Johnson, Newton65 min
May 19, 1:07 AM CDTSevere Thunderstorm WarningLZKJohnson, Logan, Pope, Yell53 min
May 19, 1:42 AM CDTSevere Thunderstorm WarningLZKConway, Pope, Van Buren37 min
May 19, 2:10 AM CDTSevere Thunderstorm WarningLZKBaxter, Fulton, Izard, Marion, Searcy, Stone30 min
May 19, 3:40 PM CDTSpecial Weather StatementLZKMonroe50 min
May 19, 4:20 PM CDTSevere Thunderstorm WarningLZKMonroe, Prairie, White, Woodruff40 min
May 19, 4:38 PM CDTSevere Thunderstorm WarningLZKCleburne, Independence, White52 min
May 19, 5:07 PM CDTSevere Thunderstorm WarningLZKCleburne, Independence, Izard, Sharp, Stone38 min
May 19, 5:12 PM CDTSpecial Weather StatementLZKWhite48 min
May 19, 5:42 PM CDTSpecial Weather StatementLZKWhite48 min
May 19, 5:43 PM CDTSpecial Weather StatementLZKConway, Van Buren47 min
May 19, 5:45 PM CDTSevere Thunderstorm WarningLZKIndependence, Jackson, White45 min
May 19, 5:49 PM CDTSpecial Weather StatementLZKLonoke41 min
May 19, 5:57 PM CDTSevere Thunderstorm WarningLZKFaulkner, Lonoke, Pulaski48 min
May 19, 6:10 PM CDTSpecial Weather StatementLZKFulton, Izard50 min
May 19, 6:22 PM CDTSevere Thunderstorm WarningLZKFulton, Izard, Sharp53 min
May 19, 6:45 PM CDTSevere Thunderstorm WarningLZKLonoke, White45 min
May 19, 6:47 PM CDTSpecial Weather StatementLZKFaulkner43 min
May 19, 6:57 PM CDTSevere Thunderstorm WarningLZKFaulkner48 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2017Every severe thunderstorm warning in 2017

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.