Alert archive / Oklahoma / Areal Flood Warnings in 2017

Areal Flood Warning 22, NWS Tulsa, OK

August 13, 2017Sequoyah County, Oklahoma

NWS Tulsa, OK issued this areal flood warning at Aug 13, 2017, 11:12 AM CDT for Sequoyah County, Oklahoma. It was in force for 27 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 13, 2017, 11:12 AM CDT (16:12 UTC)
Expired: Aug 14, 2017, 2:15 PM CDT
In force: 27 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

County Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 42 km from the middle of the area, began a volume at 16:15 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

Shreveport, LA (KBAD), launched 12:00Z, 4.2 hours before the alert went out and 348 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: 675 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 914 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 warning went out at Aug 13, 6:25 AM CDT, 4 hours 47 minutes earlier.

Area forecast discussion, Aug 13, 6:25 AM CDT, 4 hours 47 minutes before

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Hazardous weather outlook, Aug 13, 10:58 AM CDT, 14 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, 2:20 AM CDT	Areal Flood Advisory	TSA	McIntosh	3 hr
Aug 13, 3:25 AM CDT	Areal Flood Advisory	TSA	Haskell, LeFlore, Muskogee, Sequoyah	3 hr
Aug 13, 4:23 AM CDT	Flash Flood Warning	TSA	Sequoyah	4 hr
Aug 13, 6:32 AM CDT	Areal Flood Advisory	TSA	Haskell, Latimer, LeFlore	3 hr
Aug 13, 8:13 AM CDT	Areal Flood Warning	TSA	Sequoyah	3 hr
Aug 13, 11:14 AM CDT	River Flood Advisory	TSA	Sequoyah	36 hr

Nearby

Areal Flood Warnings in Oklahoma, 2017 Every areal flood warning in 2017

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.