Alert archive / Oklahoma / Flash Flood Warnings in 2019

Flash Flood Warning 19, NWS Norman, OK

May 1, 2019Atoka County, Bryan County, Johnston County, Oklahoma

NWS Norman, OK issued this flash flood warning at May 1, 2019, 7:25 PM CDT for Atoka County, Bryan County, Johnston County, Oklahoma. It was in force for 3 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: May 1, 2019, 7:25 PM CDT (00:25 UTC)
Expired: May 1, 2019, 10:30 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Atoka County, OK, Bryan County, OK, Johnston County, OK

The radar

The Norman radar (KTLX), 152 km from the middle of the area, began a volume at 00:27 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 00:00Z, 0.4 hours before the alert went out and 149 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: 36 J/kg
Mixed-layer CIN: -499 J/kg
Mixed-layer LCL: 1800 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 298 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 May 1, 6:46 PM CDT, 39 minutes earlier.

Area forecast discussion, May 1, 6:46 PM CDT, 39 minutes before

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Hazardous weather outlook, May 1, 3:42 PM CDT, 3 hours 43 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
342 PM CDT Wed May 1 2019

OKZ004>048-050>052-TXZ083>090-021000-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
342 PM CDT Wed May 1 2019

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Today and Tonight...

.Thunderstorms...
There is an enhanced risk of severe thunderstorms today across south
central Oklahoma and an adjacent part of northern Texas. There is a
slight risk for the rest of southern Oklahoma and part of east
central Oklahoma. A marginal risk exists over the rest of Oklahoma
except for a small part of north central.

Location...
The enhanced risk includes areas southeast of Seymour, Wichita
Falls, and Duncan. The slight risk includes areas southeast of
Altus, Chickasha, Norman, and Prague.

Timing...
Storms are expected to until midnight.

Impacts...
Hail up to the size of baseballs.
Damaging winds up to 70 mph.
A few tornadoes.
Excessive rainfall with flash flooding.

.Heavy Rain...
Heavy rainfall is expected to cause flooding across south central
and southeastern Oklahoma. Flooding is most likely in areas that
have saturated ground from previous rain.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
Thunderstorms are expected across southern Oklahoma and northern
Texas Thursday, and again Friday through the weekend.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Local storm report, May 1, 6:31 PM CDT, 54 minutes before

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Local storm report, May 1, 6:39 PM CDT, 46 minutes before

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Local storm report, May 1, 6:43 PM CDT, 42 minutes before

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Local storm report, May 1, 6:57 PM CDT, 28 minutes before

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Local storm report, May 1, 6:59 PM CDT, 26 minutes before

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Local storm report, May 1, 7:10 PM CDT, 15 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
May 1, 7:20 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	37 min
May 1, 9:01 PM CDT	River Flood Warning	OUN	Carter, Garvin, Murray	10 hr
May 1, 9:03 PM CDT	Areal Flood Warning	OUN	Johnston, Marshall, Murray, Pontotoc	3 hr
May 1, 9:48 PM CDT	Areal Flood Warning	OUN	Atoka, Coal, Johnston, Pontotoc	3 hr
May 2, 1:07 AM CDT	Special Weather Statement	OUN	Carter, Jefferson, Love	53 min
May 2, 1:10 AM CDT	Special Weather Statement	OUN	Garvin, Hughes, Murray, Pontotoc, Seminole	50 min
May 2, 5:41 AM CDT	Flood Watch	OUN	Atoka, Bryan, Carter, Cleveland, Coal, Cotton and 15 more	43 hr
May 2, 8:00 AM CDT	River Flood Warning	OUN	Love	3 days
May 2, 9:12 AM CDT	Special Weather Statement	OUN	Jefferson, Stephens	63 min
May 1, 8:33 PM CDT	Areal Flood Warning	OUN	Archer, Clay	3 hr

Nearby

Flash Flood Warnings in Oklahoma, 2019 Every flash flood warning in 2019

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.