Alert archive / Oklahoma / Areal Flood Advisories in 2021

Areal Flood Advisory 87, NWS Tulsa, OK

July 16, 2021LeFlore County, Oklahoma; Sebastian County, Arkansas

NWS Tulsa, OK issued this areal flood advisory at Jul 16, 2021, 1:09 PM CDT for LeFlore County, Oklahoma; Sebastian County, Arkansas. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jul 16, 2021, 1:09 PM CDT (18:09 UTC)
Expired: Jul 16, 2021, 3:15 PM CDT
In force: 2 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Sebastian County, AR, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 29 km from the middle of the area, began a volume at 18:13 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

Springfield, MO (KSGF), launched 12:00Z, 6.2 hours before the alert went out and 215 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: 18 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 73 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 areal flood advisory 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 areal flood advisory went out at Jul 16, 12:22 PM CDT, 47 minutes earlier.

Area forecast discussion, Jul 16, 12:22 PM CDT, 47 minutes before

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Hazardous weather outlook, Jul 16, 1:04 PM CDT, 5 minutes before

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In the hours before

Special weather statement, Jul 16, 9:40 AM CDT, 3 hours 29 minutes before

Special Weather Statement
National Weather Service Tulsa OK
940 AM CDT Fri Jul 16 2021

ARZ020-029-161530-
Sebastian AR-Franklin AR-
940 AM CDT Fri Jul 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN FRANKLIN AND
NORTHEASTERN SEBASTIAN COUNTIES UNTIL 1030 AM CDT...

At 939 AM CDT, strong thunderstorms were located along a line
extending from 3 miles southwest of Ozark to 6 miles north of
Charleston. Movement was southeast at 15 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations in or near the path include...
Ozark...                          Charleston...
Altus...                          Branch...
Denning...                        Wiederkehr Village...
Fort Chaffee...                   Caulksville...
Etna...                           Alix...
Meg...                            Peter Pender...
Vesta...                          Cecil...

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 3538 9371 3537 9375 3540 9379 3542 9380
      3531 9381 3532 9392 3523 9392 3523 9402
      3514 9403 3514 9409 3540 9408 3551 9384
      3546 9371
TIME...MOT...LOC 1439Z 305DEG 13KT 3546 9387 3539 9405

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 12:46 AM CDT	Special Weather Statement	TSA	Nowata, Osage, Washington	44 min
Jul 16, 1:29 AM CDT	Special Weather Statement	TSA	Craig, Nowata, Washington	46 min
Jul 16, 2:14 AM CDT	Special Weather Statement	TSA	Craig, Nowata, Ottawa	46 min
Jul 16, 6:45 AM CDT	Special Weather Statement	TSA	Tulsa	30 min
Jul 16, 7:37 AM CDT	Areal Flood Advisory	TSA	Adair, Cherokee, Delaware	3 hr
Jul 16, 8:38 AM CDT	River Flood Warning	TSA	Ottawa	4 days
Jul 16, 10:41 AM CDT	Areal Flood Advisory	TSA	LeFlore, Sequoyah	2 hr
Jul 16, 11:47 AM CDT	Flash Flood Warning	TSA	LeFlore	3 hr
Jul 16, 9:40 AM CDT	Special Weather Statement	TSA	Logan	50 min

Nearby

Areal Flood Advisories in Oklahoma, 2021 Areal Flood Advisories in Arkansas, 2021 Every areal flood advisory in 2021

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.