Alert archive / Oklahoma / Flash Flood Warnings in 2015

Flash Flood Warning 116, NWS Norman, OK

June 21, 2015Marshall County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jun 21, 2015, 12:39 PM CDT for Marshall County, Oklahoma. It was in force for 5 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: Jun 21, 2015, 12:39 PM CDT (17:39 UTC)
Expired: Jun 21, 2015, 5:45 PM CDT
In force: 5 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

County Marshall County, OK

The radar

The Norman radar (KTLX), 153 km from the middle of the area, began a volume at 17:39 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

Fort Worth, TX (KFWD), launched 12:00Z, 5.7 hours before the alert went out and 141 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: 1272 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 661 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -108 m²/s²
0-3 km storm-relative helicity: 22 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this flash flood warning went out at Jun 21, 12:24 PM CDT, 15 minutes earlier.

Area forecast discussion, Jun 21, 12:24 PM CDT, 15 minutes before

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Hazardous weather outlook, Jun 21, 12:17 PM CDT, 22 minutes before

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In the hours before

Local storm report, Jun 21, 11:09 AM CDT, 1 hour 30 minutes before

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Local storm report, Jun 21, 11:48 AM CDT, 51 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 9:34 AM CDT	Areal Flood Advisory	OUN	Bryan	3 hr
Jun 21, 10:04 AM CDT	Flash Flood Warning	OUN	Bryan	6 hr
Jun 21, 11:00 AM CDT	Flash Flood Warning	OUN	Bryan	6 hr
Jun 21, 12:15 PM CDT	Areal Flood Advisory	OUN	Bryan, Johnston, Marshall	3 hr
Jun 21, 1:48 PM CDT	Flash Flood Warning	OUN	Love	6 hr
Jun 21, 2:33 PM CDT	Areal Flood Advisory	OUN	Jefferson, Love	4 hr
Jun 21, 6:56 PM CDT	Areal Flood Warning	OUN	Bryan, Love, Marshall	12 hr

Nearby

Flash Flood Warnings in Oklahoma, 2015 Every flash flood warning in 2015

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.