Alert archive / Oklahoma / Flash Flood Warnings in 2021
Flash Flood Warning 60, NWS Tulsa, OK
NWS Tulsa, OK issued this flash flood warning at Aug 17, 2021, 9:39 AM CDT for Sequoyah County, Oklahoma. It was in force for 3 hr. 3 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
- Aug 17, 2021, 9:39 AM CDT (14:39 UTC)
- Expired
- Aug 17, 2021, 12:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Tulsa, OK
- Area
- Storm-based polygon
- Flood severity
- None
County Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 60 km from the middle of the area, began a volume at 14:42 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 |
|---|---|---|---|
| Aug 17, 9:45 AM CDT | FLASH FLOOD | 3 Nw Vian, OK | SPOTTER REPORTS ROADS CLOSE TO BEING IMPASSABLE NORTH OF CARLISLE VERIFIED BY VIDEO. SEVERAL FIELDS ARE ALSO UNDERWATER IN NUMEROUS VIDEOS SENT IN BY THE SPOTTER. SOME OF THIS WATER IS SPILLING ONTO VARIOUS ROADWAYS. |
| Aug 17, 10:16 AM CDT | FLASH FLOOD | 4 Ne Vian, OK | SPOTTER HAS VIDEO OF WATER RUSHING OVER E 1020 ROAD WHERE LITTLE VIAN CREEK INTERSECTS IT. ROAD IS IMPASSABLE. ANOTHER COUNTY ROAD NEARBY OR S 4550 HAS SEEN HALF THE ROADWAY WASH AWAY. |
| Aug 17, 10:41 AM CDT | HEAVY RAIN 4.5 | 1 N Sallisaw, OK | EM REPORTS HE RECEIVED 4.5 INCHES OF RAINFALL. SEVERAL ROADS WERE ALSO FLOODED ACROSS THE COUNTY INCLUDING 12 INCHES OF WATER OVER HIGHWAY 17 NORTH OF SALLISAW. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 2.7 hours before the alert went out and 188 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.
- Mixed-layer CAPE
- 430 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
854
WGUS54 KTSA 171439
FFWTSA
OKC135-171745-
/O.NEW.KTSA.FF.W.0060.210817T1439Z-210817T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
939 AM CDT Tue Aug 17 2021
The National Weather Service in Tulsa has issued a
* Flash Flood Warning for...
Northwestern Sequoyah County in east central Oklahoma...
* Until 1245 PM CDT.
* At 939 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 5 inches of rain
have fallen. Additional rainfall amounts of 0.5 to 1.5 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Sallisaw... Vian...
Marble City... Brushy Lake State Park...
Brushy... Mc Key...
Box...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3559 9496 3557 9472 3541 9477 3544 9502
3545 9502 3545 9503 3546 9503 3546 9504
3550 9509 3560 9505
FLASH FLOOD...RADAR INDICATED
$$1 follow-up statement
821
WGUS74 KTSA 171740
FFSTSA
Flash Flood Statement
National Weather Service Tulsa OK
1240 PM CDT Tue Aug 17 2021
OKC135-171750-
/O.EXP.KTSA.FF.W.0060.000000T0000Z-210817T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sequoyah OK-
1240 PM CDT Tue Aug 17 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1245 PM CDT THIS AFTERNOON FOR
NORTHWESTERN SEQUOYAH COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3559 9496 3557 9472 3541 9477 3544 9502
3545 9502 3545 9503 3546 9503 3546 9504
3550 9509 3560 9505
$$The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 7:14 PM CDT | Special Weather Statement | TSA | Pawnee | 46 min |
| Aug 17, 4:53 AM CDT | Areal Flood Advisory | TSA | LeFlore | 3 hr |
| Aug 17, 6:53 AM CDT | Areal Flood Advisory | TSA | Adair, Cherokee, Muskogee, Sequoyah | 3 hr |
| Aug 17, 8:27 AM CDT | Areal Flood Advisory | TSA | Pushmataha | 3 hr |
| Aug 17, 9:22 AM CDT | Areal Flood Advisory | TSA | Choctaw | 3 hr |
Nearby
Flash Flood Warnings in Oklahoma, 2021Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.