Alert archive / Oklahoma / Flash Flood Watches in 2020

Flash Flood Watch 8, NWS Tulsa, OK

August 11, 20209 counties in Oklahoma; 4 counties in Arkansas

NWS Tulsa, OK issued this flash flood watch at Aug 11, 2020, 11:33 AM CDT for 9 counties in Oklahoma; 4 counties in Arkansas. It took effect at Aug 11, 2020, 12:00 PM CDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Aug 11, 2020, 11:33 AM CDT (16:33 UTC)
In effect from: Aug 11, 2020, 12:00 PM CDT
Expired: Aug 12, 2020, 4:00 AM CDT
In force: 16 hr
Issued by: NWS Tulsa, OK
Flood severity: None

Counties Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 51 km from the middle of the area, began a volume at 16:35 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, 4.6 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.

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: 1534 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1084 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -71 m²/s²
0-3 km storm-relative helicity: -23 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 flash flood watch 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 watch went out at Aug 11, 11:00 AM CDT, 33 minutes earlier.

Area forecast discussion, Aug 11, 11:00 AM CDT, 33 minutes before

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Hazardous weather outlook, Aug 11, 5:05 AM CDT, 6 hours 28 minutes before

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In the hours before

Local storm report, Aug 11, 6:22 AM CDT, 5 hours 11 minutes before

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Local storm report, Aug 11, 6:24 AM CDT, 5 hours 9 minutes before

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Special weather statement, Aug 11, 9:02 AM CDT, 2 hours 31 minutes before

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Special weather statement, Aug 11, 10:14 AM CDT, 1 hour 19 minutes before

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Special weather statement, Aug 11, 10:48 AM CDT, 45 minutes before

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Special weather statement, Aug 11, 10:57 AM CDT, 36 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:34 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Rogers, Tulsa, Washington	27 min
Aug 10, 8:03 PM CDT	Special Weather Statement	TSA	Rogers	42 min
Aug 11, 9:02 AM CDT	Special Weather Statement	TSA	Latimer	58 min
Aug 11, 9:50 AM CDT	Areal Flood Advisory	TSA	Latimer, LeFlore	115 min
Aug 11, 10:14 AM CDT	Special Weather Statement	TSA	LeFlore	61 min
Aug 11, 10:57 AM CDT	Special Weather Statement	TSA	Sequoyah	33 min
Aug 11, 12:29 PM CDT	Areal Flood Advisory	TSA	Adair, Cherokee, Haskell, LeFlore, Muskogee, Sequoyah	86 min
Aug 11, 12:42 PM CDT	Areal Flood Advisory	TSA	LeFlore, Pushmataha	2 hr
Aug 11, 1:06 PM CDT	Areal Flood Advisory	TSA	Haskell, Latimer, LeFlore, Pushmataha, Sequoyah	114 min
Aug 11, 1:20 PM CDT	Special Weather Statement	TSA	Pushmataha	55 min
Aug 11, 1:51 PM CDT	Areal Flood Advisory	TSA	Pushmataha	114 min
Aug 11, 2:57 PM CDT	Areal Flood Advisory	TSA	Latimer, LeFlore, Pittsburg, Pushmataha	2 hr
Aug 11, 4:33 PM CDT	Areal Flood Advisory	TSA	Tulsa	57 min
Aug 11, 4:58 PM CDT	Special Weather Statement	TSA	Choctaw	62 min
Aug 11, 5:25 PM CDT	Areal Flood Advisory	TSA	Choctaw, Pushmataha	3 hr
Aug 11, 6:07 PM CDT	Areal Flood Advisory	TSA	Latimer, LeFlore	3 hr
Aug 11, 6:14 PM CDT	Special Weather Statement	TSA	LeFlore	46 min
Aug 11, 6:35 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw	26 min
Aug 11, 10:48 AM CDT	Special Weather Statement	TSA	Carroll	57 min
Aug 11, 2:25 PM CDT	Areal Flood Advisory	TSA	Madison	65 min

Nearby

Flash Flood Watches in Oklahoma, 2020 Flash Flood Watches in Arkansas, 2020 Every flash flood watch 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.