Alert archive / Arkansas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 171, NWS Tulsa, OK

July 6, 2018Benton County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 6, 2018, 1:20 PM CDT for Benton County, Arkansas. It was in force for 40 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 6, 2018, 1:20 PM CDT (18:20 UTC)
Expired: Jul 6, 2018, 2:00 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Benton County, AR

The radar

The Springfield radar (KSGF), 109 km from the middle of the area, began a volume at 18:22 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.

What was reported inside it

Time	Report	Where	Remark
Jul 6, 1:35 PM CDT	TSTM WND DMG	3 Ene Bentonville, AR	SIDING BLOWN OFF A HOUSE IN LITTLE FLOCK.
Jul 6, 1:35 PM CDT	TSTM WND DMG	Bentonville, AR	LARGE TREE LIMBS DOWN...RELAYED VIA SOCIAL MEDIA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 15 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 6.3 hours before the alert went out and 59 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: 1530 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1278 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -12 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

The text

As transmitted.

930 
WUUS54 KTSA 061820
SVRTSA
ARC007-061900-
/O.NEW.KTSA.SV.W.0171.180706T1820Z-180706T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
120 PM CDT FRI JUL 6 2018

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Northeastern Benton County in northwestern Arkansas...

* Until 200 PM CDT

* At 119 PM CDT, a severe thunderstorm was located over Pea Ridge,
  moving southwest at 10 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations in or near the path include...
  Rogers...                         Bentonville...
  Bella Vista...                    Lowell...
  Pea Ridge...                      Garfield...
  Miller...                         Centerton...
  Avoca...                          Hill Top...
  Walnut Hill...                    Vaughn...
  Monte Ne...                       

This includes Interstate 49 between mile markers 79 and 93.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3649 9396 3624 9405 3633 9438 3650 9422
      3650 9398
TIME...MOT...LOC 1819Z 029DEG 9KT 3645 9411 

HAIL...0.75IN
WIND...60MPH
 
$$

Lacy

1 follow-up statement

811 
WWUS54 KTSA 061836
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
136 PM CDT FRI JUL 6 2018

ARC007-061900-
/O.CON.KTSA.SV.W.0171.000000T0000Z-180706T1900Z/
Benton AR-
136 PM CDT FRI JUL 6 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM CDT
FOR NORTHEASTERN BENTON COUNTY...

At 136 PM CDT, a severe thunderstorm was located near Bentonville,
moving southwest at 25 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations in or near the path include...
Rogers...                         Bentonville...
Bella Vista...                    Lowell...
Pea Ridge...                      Garfield...
Miller...                         Centerton...
Avoca...                          Hill Top...
Walnut Hill...                    Vaughn...
Monte Ne...                       

This includes Interstate 49 between mile markers 79 and 93.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3649 9396 3624 9405 3633 9438 3650 9422
      3650 9398
TIME...MOT...LOC 1836Z 023DEG 20KT 3635 9418 

HAIL...0.75IN
WIND...60MPH
 
$$

Lacy

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 6, 12:33 PM CDT, 47 minutes earlier.

Area forecast discussion, Jul 6, 12:33 PM CDT, 47 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
1233 PM CDT Fri Jul 6 2018

.DISCUSSION...

The discussion for the 18Z TAF forecast can be found below.

&&

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Scattered afternoon convection can't be ruled out at any TAF site
and thus VCTS mention at all sites. Guidance suggested a bit
higher chance at KFSM, thus a TEMPO group was maintained at that
location. Convection should taper off btwn 00Z and 02Z. Based on
persistence and the latest model data, some potential for IFR fog
exists in the valley at KFYV toward sunrise. Outside of the fog
and storms, VFR conditions will prevail. Drier air entering the
region behind a cool front will give us a break from the storms on
Saturday.

Lacy

&&

.PREV DISCUSSION... /Issued 1053 AM CDT Fri Jul 6 2018/

DISCUSSION...

The latest short term data continues to suggest we should see
scattered afternoon convection again today, initially starting in
the favored terrain areas and moving/propagating westward in the
easterly flow aloft. Similar to yesterday, the taller and stronger
cores could produce strong to severe wind gusts. The current
forecast has this handled reasonably well so no changes are
planned at this time. On the temperature side of things, heat
indices are already at or near 100 degrees in many locations, will
need to closely monitor the trends for the possibility of a heat
advisory for some areas this afternoon.

Lacy

PREV DISCUSSION... /Issued 625 AM CDT Fri Jul 6 2018/

AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Scattered showers and thunderstorms are expected to affect some
of the terminals this afternoon. MVFR conditions are possible near
areas of storms, with reduced visibilities in heavy downpours.
Gusty winds will also be likely as storms collapse. Storms may
develop first across northwest Arkansas, and then build into
northeast Oklahoma along a slowly sagging cold front. VFR
conditions are expected by this evening as storms diminish.

PREV DISCUSSION... /Issued 249 AM CDT Fri Jul 6 2018/

DISCUSSION...
Convection still lingering across southeastern portions of the
forecast area, although coverage has diminished considerably over
the past few hours. Will carry low PoPs into the morning hours
although better chances of additional showers/thunderstorms arrive
by the afternoon as a weak backdoor cold front drops into the
area. HRRR and other CAMs models suggest development may start
across northeast OK into northeast AR, with the activity
developing southwest as the surface boundary sags through.
Overall severe weather threat will remain low, but some gusty
winds and locally heavy rainfall will be possible.

The weak cold front will bring slightly cooler temperatures for
the weekend, along with drier low-level air (and lower humidity)
for the weekend.

The upper high will build back across the central Plains for next
week, with a series of weak waves expected to track east along the
southern periphery of the ridge. This will bring periodic chances
of showers and thunderstorms, mainly to the southern half of the
forecast area for much of next week.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   96  71  92  67 /  30  10  10   0
FSM   95  73  92  68 /  40  20  10   0
MLC   93  72  90  67 /  40  20  10   0
BVO   95  67  91  59 /  20  10   0   0
FYV   91  63  86  58 /  30  10  10   0
BYV   90  65  87  61 /  30  10  10   0
MKO   95  71  90  66 /  40  20  10   0
MIO   93  67  89  61 /  20  10   0   0
F10   94  72  90  67 /  40  20  10   0
HHW   95  73  93  71 /  30  20  20  10

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...None.
AR...None.
&&

AVIATION.....30

Hazardous weather outlook, Jul 6, 1:00 PM CDT, 20 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
100 PM CDT Fri Jul 6 2018

ARZ001-002-010-011-019-020-029-OKZ049-053>076-071000-
Adair OK-Benton AR-Carroll AR-Cherokee OK-Choctaw OK-Craig OK-
Crawford AR-Creek OK-Delaware OK-Franklin AR-Haskell OK-Latimer OK-
Le Flore OK-Madison AR-Mayes OK-McIntosh OK-Muskogee OK-Nowata OK-
Okfuskee OK-Okmulgee OK-Osage OK-Ottawa OK-Pawnee OK-Pittsburg OK-
Pushmataha OK-Rogers OK-Sebastian AR-Sequoyah OK-Tulsa OK-Wagoner OK-
Washington OK-Washington AR-
100 PM CDT Fri Jul 6 2018

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...Today and Tonight.

SEVERE THUNDERSTORM.
	RISK...Limited.
	AREA...Eastern Oklahoma and western Arkansas.
	ONSET...Ongoing.

DANGEROUS HEAT.
	RISK...Limited to Elevated in spots.
	AREA...Much of eastern Oklahoma and west central Arkansas.
	ONSET...Ongoing.

DISCUSSION...

Thunderstorms will continue to increase in coverage thru the
afternoon across the region, ahead of a weak cold front. The
stronger storms are likely to produce strong gusty winds. Isolated
reports of damaging winds are possible as well with the strongest
cells. Frequent cloud to ground lightning and brief heavy downpours
will also accompany the storms.

Outside of the storm activity, much of eastern Oklahoma and west
central Arkansas will again see heat index values climb into the 100
to 105 degree range. Take the proper heat precautions if you must be
outdoors during the middle of the day.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Local Spotter Activation May Be Needed.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
SATURDAY...No Hazards.
SUNDAY through WEDNESDAY...Thunderstorm Potential.
THURSDAY...Thunderstorm Potential...Dangerous Heat Potential.

EXTENDED DISCUSSION...
Drier and slightly cooler conditions will follow the front over
the weekend. Thunderstorm chances return early next week as a more
humid airmass spreads back across the region.

weather.gov/tulsa contains additional information.

Lacy

In the hours before

Special weather statement, Jul 6, 12:11 PM CDT, 1 hour 9 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1211 PM CDT FRI JUL 6 2018

OKZ058-063-061745-
Delaware OK-Ottawa OK-
1211 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN DELAWARE AND
SOUTHEASTERN OTTAWA COUNTIES UNTIL 1245 PM CDT...

At 1211 PM CDT, a strong thunderstorm was located over Grove, moving
southwest at 20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations in or near the path include...
Jay...                            Grove...
Bernice...                        Cleora...
Honey Creek State Park...         Bernice State Park...
Dodge...                          Cayuga...
Zena...

LAT...LON 3666 9462 3654 9462 3638 9484 3660 9500
      3663 9500 3675 9471
TIME...MOT...LOC 1711Z 057DEG 18KT 3659 9476

Lacy

Special weather statement, Jul 6, 12:48 PM CDT, 32 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1248 PM CDT FRI JUL 6 2018

OKZ056-057-061815-
Craig OK-Nowata OK-
1248 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CRAIG AND
SOUTHEASTERN NOWATA COUNTIES UNTIL 115 PM CDT...

At 1248 PM CDT, a strong thunderstorm was located 11 miles northeast
of New Alluwe, moving south at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations in or near the path include...
New Alluwe...                     Centralia...
Centrailia...

LAT...LON 3685 9548 3680 9526 3660 9529 3660 9561
TIME...MOT...LOC 1748Z 015DEG 10KT 3676 9540

Lacy

Special weather statement, Jul 6, 1:12 PM CDT, 8 minutes before

Special Weather Statement
National Weather Service Tulsa OK
112 PM CDT FRI JUL 6 2018

OKZ056-061-061845-
Rogers OK-Nowata OK-
112 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN ROGERS AND SOUTHEASTERN
NOWATA COUNTIES UNTIL 145 PM CDT...

At 112 PM CDT, a strong thunderstorm was located 3 miles northwest of
New Alluwe, moving south at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations in or near the path include...
Nowata...                         Chelsea...
Talala...                         New Alluwe...
Watova...

LAT...LON 3669 9543 3660 9543 3660 9542 3647 9544
      3655 9580 3676 9567
TIME...MOT...LOC 1812Z 017DEG 10KT 3664 9554

Lacy

Special weather statement, Jul 6, 1:14 PM CDT, 6 minutes before

Special Weather Statement
National Weather Service Tulsa OK
114 PM CDT FRI JUL 6 2018

ARZ001-061845-
Benton AR-
114 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BENTON COUNTY UNTIL
145 PM CDT...

At 114 PM CDT, a strong thunderstorm was located over Pea Ridge,
moving southwest at 15 mph.

Wind gusts of 50 to 55 mph will be possible with this storm.

Locations in or near the path include...
Rogers...                         Bentonville...
Bella Vista...                    Lowell...
Pea Ridge...                      Garfield...
Hiwasse...                        Miller...
Centerton...                      Avoca...
Gateway...                        Hill Top...
Walnut Hill...                    Monte Ne...

This includes Interstate 49 between mile markers 81 and 93.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3648 9393 3624 9407 3641 9439 3650 9425
      3650 9397
TIME...MOT...LOC 1814Z 042DEG 11KT 3647 9411

Lacy

Special weather statement, Jul 6, 1:15 PM CDT, 5 minutes before

Special Weather Statement
National Weather Service Tulsa OK
115 PM CDT FRI JUL 6 2018

ARZ001-OKZ063-061845-
Benton AR-Delaware OK-
115 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BENTON AND
NORTHEASTERN DELAWARE COUNTIES UNTIL 145 PM CDT...

At 115 PM CDT, a strong thunderstorm was located over South West
City, moving southwest at 15 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations in or near the path include...
Jay...                            Maysville...
Dodge...                          Cayuga...

LAT...LON 3650 9462 3650 9444 3629 9461 3647 9486
      3662 9462
TIME...MOT...LOC 1815Z 042DEG 11KT 3652 9458

Lacy

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 5, 9:17 PM CDT	Special Weather Statement	TSA	Carroll	28 min
Jul 5, 9:34 PM CDT	Special Weather Statement	TSA	Benton	26 min
Jul 5, 10:07 PM CDT	Special Weather Statement	TSA	Carroll	53 min
Jul 6, 1:14 PM CDT	Special Weather Statement	TSA	Benton	31 min
Jul 6, 3:37 PM CDT	Special Weather Statement	TSA	Crawford, Franklin, Sebastian	38 min
Jul 6, 4:10 PM CDT	Special Weather Statement	TSA	Sebastian	65 min
Jul 6, 5:58 PM CDT	Special Weather Statement	TSA	Madison	32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.