Alert archive / Oklahoma / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Tulsa, OK

August 13, 201822 counties in Oklahoma; 4 counties in Arkansas

NWS Tulsa, OK issued this flash flood watch at Aug 13, 2018, 3:13 PM CDT for 22 counties in Oklahoma; 4 counties in Arkansas. It took effect at Aug 13, 2018, 7:00 PM CDT. It was in force for 48 hr.

The area

The counties it named.

The facts

Issued: Aug 13, 2018, 3:13 PM CDT (20:13 UTC)
In effect from: Aug 13, 2018, 7:00 PM CDT
Expired: Aug 15, 2018, 7:00 PM CDT
In force: 48 hr
Issued by: NWS Tulsa, OK
Flood severity: None

All 26 counties

Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pawnee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 42 km from the middle of the area, began a volume at 20:17 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

Norman, OK (KOUN), launched 12:00Z, 8.2 hours before the alert went out and 204 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: 60 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1152 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 24 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 12, 6:43 PM CDT, 20 hours 30 minutes earlier.

Area forecast discussion, Aug 12, 6:43 PM CDT, 20 hours 30 minutes before

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Hazardous weather outlook, Aug 12, 5:08 PM CDT, 22 hours 5 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 13, 5:32 PM CDT	Special Weather Statement	TSA	Choctaw, Pittsburg, Pushmataha	43 min
Aug 13, 6:12 PM CDT	Special Weather Statement	TSA	Choctaw, Haskell, Latimer, Pushmataha	48 min
Aug 13, 6:58 PM CDT	Special Weather Statement	TSA	Haskell, LeFlore	47 min

Nearby

Flash Flood Watches in Oklahoma, 2018 Flash Flood Watches in Arkansas, 2018 Every flash flood watch in 2018

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.