Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 54, NWS Tulsa, OK

July 18, 2021Muskogee County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Jul 18, 2021, 2:11 AM CDT for Muskogee County, Oklahoma. It was in force for 3 hr. 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 18, 2021, 2:11 AM CDT (07:11 UTC)
Expired: Jul 18, 2021, 5:15 AM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

County Muskogee County, OK

The radar

The Tulsa radar (KINX), 48 km from the middle of the area, began a volume at 07:12 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 18, 2:35 AM CDT	FLASH FLOOD	2 Ene Muskogee, OK	LOCAL LAW ENFORCEMENT REPORTS FLOODED ROADWAYS ALONG GIBSON ST AND YORK ST.
Jul 18, 3:00 AM CDT	FLASH FLOOD	2 Ne Muskogee, OK	DELAYED REPORT: BROADCAST MEDIA REPORTS LAW ENFORCEMENT AND LOCAL FIRE DEPARTMENT RESCUING A WOMAN WHO WAS SWEPT INTO A DITCH AS A RESULT OF FLASH FLOODING NEAR OLD SHAWNEE ROAD AND N. YORK ST. BODY CAMERA FOOTAGE IN THE REPORT SHOWS THE RESCUE WAS INITIATED A

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 00:00Z, 7.2 hours before the alert went out and 189 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: 346 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -60 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.

269 
WGUS54 KTSA 180711
FFWTSA
OKC101-181015-
/O.NEW.KTSA.FF.W.0054.210718T0711Z-210718T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
211 AM CDT Sun Jul 18 2021

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  North Central Muskogee County in east central Oklahoma...

* Until 515 AM CDT.

* At 211 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1.5 and 3.5 inches of rain have fallen. Additional rainfall 
  amounts up to 1.5 inches are possible in the warned area. Flash 
  flooding is ongoing or expected to begin shortly. A gauge in 
  downtown Muskogee has measured 3.2" of rain with 1.3 inches of 
  that coming in 10 mins. This has likely lead to or will lead to 
  flash flooding in Muskogee shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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...
  Muskogee...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3581 9532 3572 9524 3570 9532 3569 9546
      3578 9544 3580 9544 3580 9543 3580 9542
      3580 9541

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Snider

1 follow-up statement

789 
WGUS74 KTSA 181016
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
516 AM CDT Sun Jul 18 2021

OKC101-181026-
/O.EXP.KTSA.FF.W.0054.000000T0000Z-210718T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Muskogee OK-
516 AM CDT Sun Jul 18 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR NORTH CENTRAL MUSKOGEE 
COUNTY...

The heavy rain has ended. Flooding however will be ongoing as the 
water slowly recedes and isolated shower and storm activity move 
through the area. An Areal Flood Warning is now in effect. Please 
continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 100 PM CDT Sunday for 
portions of Arkansas and Oklahoma.

LAT...LON 3581 9532 3572 9524 3570 9532 3569 9546
      3578 9544 3580 9544 3580 9543 3580 9542
      3580 9541

$$

Snider

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 7:16 PM CDT	Severe Thunderstorm Warning	TSA	Adair	44 min
Jul 17, 8:05 PM CDT	Special Weather Statement	TSA	Ottawa	25 min
Jul 17, 8:50 PM CDT	Special Weather Statement	TSA	Osage	40 min
Jul 17, 9:01 PM CDT	Special Weather Statement	TSA	Wagoner	59 min
Jul 17, 9:44 PM CDT	Special Weather Statement	TSA	Rogers	61 min
Jul 17, 10:01 PM CDT	Areal Flood Advisory	TSA	Craig, Ottawa	119 min
Jul 17, 10:54 PM CDT	Areal Flood Advisory	TSA	Cherokee, Muskogee, Sequoyah	2 hr
Jul 17, 11:41 PM CDT	Flash Flood Warning Considerable damage threat	TSA	Tulsa	4 hr
Jul 18, 12:04 AM CDT	Flash Flood Warning	TSA	Muskogee	5 hr
Jul 18, 1:43 AM CDT	Areal Flood Advisory	TSA	Cherokee, Muskogee, Wagoner	2 hr
Jul 18, 1:50 AM CDT	Areal Flood Advisory	TSA	Delaware	115 min
Jul 18, 2:23 AM CDT	Areal Flood Advisory	TSA	Tulsa	112 min
Jul 18, 2:49 AM CDT	Special Weather Statement	TSA	Muskogee	26 min
Jul 18, 3:04 AM CDT	Flash Flood Warning	TSA	Muskogee, Wagoner	2 hr
Jul 18, 3:15 AM CDT	Special Weather Statement	TSA	Muskogee	30 min
Jul 18, 3:45 AM CDT	Areal Flood Warning	TSA	Tulsa	3 hr
Jul 18, 4:50 AM CDT	Areal Flood Advisory	TSA	Adair, LeFlore, Sequoyah	3 hr
Jul 18, 5:14 AM CDT	Areal Flood Warning	TSA	Cherokee, Muskogee, Wagoner	3 hr
Jul 18, 5:24 AM CDT	Flash Flood Warning	TSA	Sequoyah	3 hr
Jul 18, 5:25 AM CDT	Areal Flood Warning	TSA	Muskogee, Wagoner	50 min
Jul 18, 8:52 AM CDT	River Flood Advisory	TSA	Cherokee	36 hr

Nearby

Flash Flood Warnings in Oklahoma, 2021 Every 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.