Alert archive / Arkansas / Flash Flood Warnings in 2020

Flash Flood Warning 22, NWS Tulsa, OK

July 30, 2020Benton County, Washington County, Arkansas; Delaware County, Mayes County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Jul 30, 2020, 1:16 AM CDT for Benton County, Washington County, Arkansas; Delaware County, Mayes County, Oklahoma. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 30, 2020, 1:16 AM CDT (06:16 UTC)
Expired: Jul 30, 2020, 4:15 AM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Benton County, AR, Washington County, AR, Delaware County, OK, Mayes County, OK

The radar

The Tulsa radar (KINX), 91 km from the middle of the area, began a volume at 06:19 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 00:00Z, 6.3 hours before the alert went out and 92 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: 595 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 609 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

471 
WGUS54 KTSA 300616
FFWTSA
ARC007-143-OKC041-097-300915-
/O.NEW.KTSA.FF.W.0022.200730T0616Z-200730T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
116 AM CDT Thu Jul 30 2020

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Benton County in northwestern Arkansas...
  Northeastern Washington County in northwestern Arkansas...
  Delaware County in northeastern Oklahoma...
  Northeastern Mayes County in northeastern Oklahoma...

* Until 415 AM CDT.

* At 115 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to one inch of rain has
  already fallen. Flash flooding is ongoing or expected to begin
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that may experience flooding include...
  Fayetteville...                   Springdale...
  Rogers...                         Bentonville...
  Siloam Springs...                 Jay...
  Bella Vista...                    Lowell...
  Pea Ridge...                      Gentry...
  Tontitown...                      Bethel Heights...
  Gravette...                       Cave Springs...
  Decatur...                        West Siloam Springs...
  Colcord...                        Kansas...
  Highfill...                       Gateway...

Additional rainfall amounts of 2 to 3 inches are possible in the 
warned area.

This includes Interstate 49 between mile markers 65 and 93.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3656 9462 3650 9462 3650 9387 3607 9404
      3614 9456 3616 9456 3616 9473 3620 9503
      3657 9501

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 30, 12:20 AM CDT, 56 minutes earlier.

Area forecast discussion, Jul 30, 12:20 AM CDT, 56 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
1220 AM CDT Thu Jul 30 2020

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Multiple clusters of thunderstorms are ongoing across northeast
OK at present, some of which should expand into northwest AR over
the next few hours. Gusty sfc winds in excess of 30 knots
possible through about 08z along with IFR conditions at
KTUL/KRVS/KBVO, with lessening potential to a degree as storms
push farther east. Overall storm chances wane through the morning
with redevelopment likely along a frontal boundary this
afternoon/evening. Better potential may be focused more at
KMLC/KFSM during that time.

&&

.PREV DISCUSSION... /Issued 1018 PM CDT Wed Jul 29 2020/

DISCUSSION...
Showers and thunderstorms continue from east central Oklahoma into
northwest Arkansas at this time, with additional storms about to
enter northeast Oklahoma from Kansas. Another area of storms from
central Kansas into northwest Oklahoma will also likely move into
the area overnight. With several rounds of showers and storms
expected across northeast Oklahoma and northwest Arkansas, will
maintain the flood watch overnight. Will drop parts of southeast
Oklahoma from the watch, as any rainfall in that area will be much
more isolated in nature, and previous rainfall amounts have been
fairly light.

Have made some minor changes to pops overnight, with the rest of
the forecast looking good at this time.

Update products have already been sent.

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...Flood Watch until 7 AM CDT this morning for OKZ054>072-074-076.

AR...Flood Watch until 7 AM CDT this morning for ARZ001-002-010-011-
     019-020-029.

&&

AVIATION.....14

Hazardous weather outlook, Jul 29, 5:22 PM CDT, 7 hours 54 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
522 PM CDT Wed Jul 29 2020

ARZ001-002-010-011-019-020-029-OKZ049-053>076-301000-
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-
522 PM CDT Wed Jul 29 2020

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

.DAY ONE...Tonight.

FLASH FLOOD.
	RISK...Limited.
    AREA...Eastern Oklahoma and Northwest Arkansas.
    ONSET...Ongoing.

HEAVY RAIN.
	RISK...Limited.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

THUNDERSTORMS WITH DANGEROUS LIGHTNING.
	RISK...Elevated.
	AREA...Eastern Oklahoma and NOrthwest Arkansas.
	ONSET...Ongoing.

DISCUSSION...
A few isolated thunderstorms will remain possible into this
evening, with locally heavy rainfall possible.

Thunderstorms currently developing across western Kansas will move
southeast overnight and may move into mainly northeast Oklahoma
after midnight. Gusty winds and locally heavy rainfall may
accompany these storms.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Spotter Activation Not Expected.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
THURSDAY...Thunderstorm Potential...Dangerous Heat Potential...
           Heavy Rain Potential.
FRIDAY...Thunderstorm Potential...Heavy Rain Potential.
SATURDAY through MONDAY...Thunderstorm Potential.
TUESDAY...No Hazards.

EXTENDED DISCUSSION...
An approaching upper level disturbance from the northwest Thursday
will increase the potential for severe weather across eastern
Oklahoma Thursday afternoon into the evening hours. One or more
clusters of storms will be possible with a damaging wind threat.
Locally heavy rainfall is also expected with this round of storms
as well Thursday night into Friday, which may lead to additional
flooding.

weather.gov/tulsa contains additional information.

In the hours before

Special weather statement, Jul 29, 10:41 PM CDT, 2 hours 35 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1041 PM CDT Wed Jul 29 2020

OKZ054-055-300430-
Osage OK-Washington OK-
1041 PM CDT Wed Jul 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE AND NORTHERN
WASHINGTON COUNTIES UNTIL 1130 PM CDT...

At 1041 PM CDT, a strong thunderstorm was located 5 miles north of
Bigheart, moving southeast at 15 mph.

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

Locations in or near the path include...
Bartlesville...                   Pawhuska...
Dewey...                          Copan...
Elgin...                          Bigheart...
Osage Hills State Park...         Bartlesville Municipal Airport...
Hulah...                          Okesa...
Sunset Lake...                    Wah Sha She State Park...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3700 9583 3667 9581 3665 9631 3700 9654
TIME...MOT...LOC 0341Z 323DEG 12KT 3693 9620

Snider

Special weather statement, Jul 29, 11:10 PM CDT, 2 hours 6 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1110 PM CDT Wed Jul 29 2020

OKZ055>058-061-062-300445-
Craig OK-Rogers OK-Ottawa OK-Nowata OK-Washington OK-Mayes OK-
1110 PM CDT Wed Jul 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR CRAIG...NORTHEASTERN ROGERS...
WESTERN OTTAWA...NORTHWESTERN MAYES...NORTHEASTERN WASHINGTON AND
NOWATA COUNTIES UNTIL 1145 PM CDT...

At 1110 PM CDT, strong thunderstorms were located along a line
extending from 8 miles northwest of Welch to 9 miles east of Nowata
to 7 miles west of Delaware. Movement was southeast at 50 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations in or near the path include...
Bartlesville...                   Miami...
Vinita...                         Baxter Springs...
Nowata...                         Commerce...
Chelsea...                        Afton...
Quapaw...                         South Coffeyville...
Welch...                          Delaware...
Bluejacket...                     Lenapah...
Big Cabin...                      Treece...
Wann...                           New Alluwe...
Picher...                         Watova...

This includes Interstate 44 between mile markers 270 and 316.

LAT...LON 3667 9496 3667 9500 3662 9500 3646 9514
      3652 9562 3666 9593 3700 9585 3700 9467
TIME...MOT...LOC 0410Z 313DEG 45KT 3695 9523 3675 9548 3674 9576

Special weather statement, Jul 29, 11:35 PM CDT, 1 hour 41 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1135 PM CDT Wed Jul 29 2020

OKZ055>057-060>062-300530-
Tulsa OK-Craig OK-Rogers OK-Nowata OK-Washington OK-Mayes OK-
1135 PM CDT Wed Jul 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CRAIG...ROGERS...
NORTHERN MAYES...SOUTHERN WASHINGTON...SOUTHERN NOWATA AND
NORTHEASTERN TULSA COUNTIES UNTIL 1230 AM CDT...

At 1135 PM CDT, strong thunderstorms were located along a line
extending from 4 miles north of Ochelata to near Talala to 4 miles
northeast of New Alluwe. Movement was southeast at 25 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations in or near the path include...
Bartlesville...                   Claremore...
Nowata...                         Pryor Creek...
Skiatook...                       Collinsville...
Chelsea...                        Oologah...
Langley...                        Adair...
Ramona...                         Ochelata...
Foyil...                          Talala...
Big Cabin...                      Vera...
Pensacola...                      New Alluwe...
Watova...                         White Oak...

This includes Interstate 44 between mile markers 249 and 278.

LAT...LON 3669 9571 3673 9539 3644 9502 3626 9544
      3637 9594 3652 9600 3673 9600
TIME...MOT...LOC 0435Z 324DEG 24KT 3667 9598 3654 9569 3665 9543

Special weather statement, Jul 30, 12:00 AM CDT, 1 hour 16 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1200 AM CDT Thu Jul 30 2020

OKZ054-059-300600-
Osage OK-Pawnee OK-
1200 AM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN OSAGE AND PAWNEE COUNTIES
UNTIL 100 AM CDT...

At 1200 AM CDT, strong thunderstorms were located along a line
extending from 3 miles northwest of Kildare to 5 miles southwest of
Lucien. Movement was east at 50 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations in or near the path include...
Pawhuska...                       Pawnee...
Fairfax...                        Shidler...
Ralston...                        Burbank...
Blackburn...                      Maramec...
Elgin...                          Skedee...
Grainola...                       Foraker...
Pearsonia...                      Sooner Lake...
Southern Kaw Lake...              Webb City...
Apperson...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3700 9619 3616 9661 3616 9682 3624 9682
      3625 9692 3633 9693 3634 9703 3651 9703
      3655 9690 3658 9689 3660 9692 3659 9705
      3668 9706 3670 9703 3668 9694 3675 9689
      3674 9683 3677 9682 3678 9675 3700 9675
TIME...MOT...LOC 0500Z 272DEG 42KT 3684 9710 3621 9750

Special weather statement, Jul 30, 12:57 AM CDT, 19 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1257 AM CDT Thu Jul 30 2020

ARZ001-OKZ062-063-300645-
Benton AR-Delaware OK-Mayes OK-
1257 AM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN BENTON...DELAWARE AND
NORTHEASTERN MAYES COUNTIES UNTIL 145 AM CDT...

At 1257 AM CDT, a strong thunderstorm was located 6 miles southeast
of Chloeta, moving east at 40 mph.

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

Locations in or near the path include...
Bentonville...                    Bella Vista...
Siloam Springs...                 Jay...
Gentry...                         Gravette...
Decatur...                        Salina...
West Siloam Springs...            Langley...
Colcord...                        Kansas...
Highfill...                       Spavinaw...
Disney...                         Springtown...
Hoot Owl...                       Northwest Arkansas Regional Air...
Cherokee State Park...            Hiwasse...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3650 9462 3650 9424 3622 9430 3621 9433
      3614 9434 3614 9439 3610 9439 3614 9456
      3616 9456 3616 9468 3626 9517 3651 9509
      3651 9501 3656 9500 3657 9462
TIME...MOT...LOC 0557Z 284DEG 33KT 3636 9490

Special weather statement, Jul 30, 1:10 AM CDT, 6 minutes before

Special Weather Statement
National Weather Service Tulsa OK
110 AM CDT Thu Jul 30 2020

OKZ059-060-064-300715-
Tulsa OK-Pawnee OK-Creek OK-
110 AM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CREEK...SOUTH CENTRAL
PAWNEE AND WEST CENTRAL TULSA COUNTIES UNTIL 215 AM CDT...

At 109 AM CDT, a strong thunderstorm was located 3 miles northwest of
Oilton, moving east at 35 mph.

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

Locations in or near the path include...
Sand Springs...                   Sapulpa...
Mannford...                       Kiefer...
Kellyville...                     Oilton...
Jennings...                       Keystone State Park...
Silver City...                    Gray...

This includes Interstate 44 between mile markers 202 and 217.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 3621 9672 3613 9604 3591 9604 3601 9662
      3616 9662 3616 9672
TIME...MOT...LOC 0609Z 271DEG 29KT 3613 9663

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 10:52 PM CDT	Areal Flood Advisory	TSA	Crawford, Franklin	3 hr
Jul 30, 3:48 AM CDT	Special Weather Statement	TSA	Crawford	57 min
Jul 30, 3:19 PM CDT	Special Weather Statement	TSA	Polk	26 min
Jul 29, 8:38 PM CDT	Special Weather Statement	TSA	Muskogee	37 min
Jul 29, 9:02 PM CDT	Special Weather Statement	TSA	Sequoyah	28 min
Jul 29, 9:27 PM CDT	Special Weather Statement	TSA	Adair	33 min
Jul 29, 10:21 PM CDT	Areal Flood Advisory	TSA	Adair, Cherokee, Sequoyah	3 hr
Jul 29, 10:41 PM CDT	Special Weather Statement	TSA	Washington	49 min
Jul 29, 11:10 PM CDT	Special Weather Statement	TSA	Craig, Nowata, Washington	35 min
Jul 29, 11:35 PM CDT	Special Weather Statement	TSA	Rogers, Washington	55 min
Jul 30, 12:00 AM CDT	Special Weather Statement	TSA	Osage, Pawnee	60 min
Jul 30, 12:18 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	42 min
Jul 30, 12:33 AM CDT	Flash Flood Warning	TSA	Craig, Mayes, Nowata, Rogers, Tulsa, Washington	3 hr
Jul 30, 12:51 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee, Tulsa, Washington	39 min
Jul 30, 12:57 AM CDT	Special Weather Statement	TSA	Delaware	48 min
Jul 30, 1:10 AM CDT	Special Weather Statement	TSA	Creek	65 min
Jul 30, 1:27 AM CDT	Severe Thunderstorm Warning	TSA	Mayes, Osage, Rogers, Tulsa, Wagoner, Washington	63 min
Jul 30, 1:52 AM CDT	Areal Flood Advisory	TSA	Rogers, Tulsa, Wagoner	3 hr
Jul 30, 2:11 AM CDT	Special Weather Statement	TSA	Wagoner	49 min
Jul 30, 2:22 AM CDT	Special Weather Statement	TSA	Adair, Cherokee, Delaware, Mayes	53 min
Jul 30, 2:40 AM CDT	Special Weather Statement	TSA	Muskogee	65 min
Jul 30, 5:24 AM CDT	Special Weather Statement	TSA	Pawnee	51 min
Jul 30, 6:14 AM CDT	Special Weather Statement	TSA	Creek, Okfuskee	61 min
Jul 30, 6:40 AM CDT	Areal Flood Advisory	TSA	Craig, Delaware, Mayes, Rogers	2 hr
Jul 30, 7:38 AM CDT	Areal Flood Advisory	TSA	McIntosh, Muskogee, Okmulgee	112 min
Jul 30, 5:04 PM CDT	Special Weather Statement	TSA	McIntosh	26 min
Jul 30, 5:06 PM CDT	Special Weather Statement	TSA	Pittsburg	24 min
Jul 30, 5:29 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	34 min
Jul 30, 6:05 PM CDT	Special Weather Statement	TSA	Pittsburg	25 min
Jul 30, 6:18 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	28 min
Jul 30, 6:22 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	53 min
Jul 30, 6:32 PM CDT	Special Weather Statement	TSA	Pittsburg	28 min
Jul 30, 6:47 PM CDT	Areal Flood Advisory	TSA	Pittsburg	3 hr
Jul 30, 6:56 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	49 min

Nearby

Flash Flood Warnings in Arkansas, 2020 Flash Flood Warnings in Oklahoma, 2020 Every flash flood warning in 2020

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.