Alert archive / Arkansas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 274, NWS Little Rock, AR

July 17, 2018Drew County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jul 17, 2018, 1:50 PM CDT for Drew County, Arkansas. It was in force for 40 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 17, 2018, 1:50 PM CDT (18:50 UTC)
Expired
Jul 17, 2018, 2:30 PM CDT
In force
40 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Drew County, AR

The radar

The Little Rock radar (KLZK), 147 km from the middle of the area, began a volume at 18:49 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 (KBAD), launched 12:00Z, 6.8 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 12:00Z on 2018-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 154 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 12:00Z on 2018-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 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
154 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
1608 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
58 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 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 17, 12:40 PM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Jul 17, 12:40 PM CDT, 1 hour 10 minutes before
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Hazardous weather outlook, Jul 17, 1:19 PM CDT, 31 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Little Rock AR
119 PM CDT Tue Jul 17 2018

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-181830-
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-
119 PM CDT Tue Jul 17 2018

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

.DAY ONE...Today and Tonight

Isolated to scattered thunderstorms will be possible through
the overnight hours. An isolated strong to severe storm will be
be possible mainly in the afternoon to early evening with gusty
winds and frequent lightning the greatest concerns. The overall
threat for severe weather remains low.

Heat index values will exceed 100 degrees through early evening
for parts of central and southern Arkansas. Extra precautions
should be taken to minimize the affects of the heat.

.DAYS TWO THROUGH SEVEN...Wednesday Through Monday

Thunderstorms will become a bit more scattered and common by the
middle of this week, with the best chances for seeing thunderstorms
during the afternoon hours Wednesday. While organized severe
weather is not expected, a few strong storms may be possible.
Chances for thunderstorms decrease by the weekend.

Also, heat index values will remain elevated through the week.
Most locations will see heat index values in the upper 90s to just
over 100 degrees, while some areas may see heat index values exceed
105 degrees in the afternoons.

.Spotter Information Statement...

Spotter activation is not anticipated today through tonight.

&&

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

In the hours before

Special weather statement, Jul 17, 1:42 PM CDT, 8 minutes before
Special Weather Statement
National Weather Service Little Rock AR
142 PM CDT TUE JUL 17 2018

ARZ064-069-171930-
Drew AR-Lincoln AR-
142 PM CDT TUE JUL 17 2018

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN DREW AND SOUTH CENTRAL
LINCOLN COUNTIES UNTIL 230 PM CDT...

At 142 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Monticello, moving southeast at 5 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Monticello...                     Baxter...
Collins...                        Florence...
Coleman...                        Enon...
Selma...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3349 9177 3364 9182 3383 9172 3370 9145
      3348 9149 3341 9166
TIME...MOT...LOC 1842Z 304DEG 6KT 3369 9169

65

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 3:57 AM CDTHeat AdvisoryLZKArkansas, Bradley, Calhoun, Cleveland, Dallas, Desha and 8 more15 hr
Jul 17, 1:42 PM CDTSpecial Weather StatementLZKDrew48 min
Jul 17, 2:06 PM CDTSpecial Weather StatementLZKSaline39 min
Jul 17, 4:13 PM CDTSevere Thunderstorm WarningLZKJohnson, Logan47 min
Jul 17, 4:31 PM CDTSpecial Weather StatementLZKGrant44 min
Jul 17, 4:41 PM CDTSevere Thunderstorm WarningLZKLogan, Scott, Yell34 min
Jul 17, 5:07 PM CDTSpecial Weather StatementLZKIndependence23 min
Jul 17, 5:12 PM CDTSpecial Weather StatementLZKSharp33 min
Jul 17, 5:14 PM CDTSpecial Weather StatementLZKYell31 min
Jul 17, 5:37 PM CDTSevere Thunderstorm WarningLZKPerry, Pulaski, Saline23 min
Jul 17, 5:41 PM CDTSpecial Weather StatementLZKDallas34 min
Jul 17, 6:10 PM CDTSpecial Weather StatementLZKIndependence50 min
Jul 17, 6:19 PM CDTSevere Thunderstorm WarningLZKConway, Faulkner, Perry, Pulaski, Saline26 min
Jul 17, 6:34 PM CDTSpecial Weather StatementLZKClark26 min
Jul 17, 6:35 PM CDTSpecial Weather StatementLZKConway, Faulkner25 min
Jul 17, 6:36 PM CDTSevere Thunderstorm WarningLZKFaulkner, Perry, Pulaski24 min
Jul 17, 6:58 PM CDTSevere Thunderstorm WarningLZKFaulkner, Pulaski19 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2018Every 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.