Alert archive / Oklahoma / Flash Flood Warnings in 2019

Flash Flood Warning 11, NWS Norman, OK

May 1, 20195 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at May 1, 2019, 4:55 AM CDT for 5 counties in 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, 4:55 AM CDT (09:55 UTC)
Expired: May 1, 2019, 8:00 AM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Atoka County, OK, Coal County, OK, Hughes County, OK, Johnston County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 114 km from the middle of the area, began a volume at 09:58 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, 9.9 hours before the alert went out and 115 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: 65 J/kg
Mixed-layer CIN: -282 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 4:20 AM CDT, 35 minutes earlier.

Area forecast discussion, May 1, 4:20 AM CDT, 35 minutes before

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Hazardous weather outlook, Apr 30, 8:59 PM CDT, 7 hours 56 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
859 PM CDT Tue Apr 30 2019

OKZ004>048-050>052-TXZ083>090-020200-
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-
859 PM CDT Tue Apr 30 2019

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

.DAY ONE...Tonight...

.Thunderstorms...
There is an enhanced risk of severe thunderstorms tonight across
the southeast Oklahoma.

Location...
The enhanced risk area is generally along and east of a line from
Shawnee to Duncan to Waurika.

Timing...
The most likely time for severe storms will be from now through 3
AM.

Impacts...
Hail up to the size of quarters.
Damaging winds of 60 to 70 mph.
Excessive rainfall with flooding possible.
Low tornado risk.

Discussion...
Numerous storms are expected to continue across south central and
southeast Oklahoma tonight with the primary threat of a flooding.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
the area should prepare for potential severe weather operations.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

.Thunderstorms...
There is a slight risk of severe thunderstorms on Wednesday mainly
across the eastern half of Oklahoma. A marginal risk covers the
western half of Oklahoma and western north Texas. The most likely
time for severe weather will be during the afternoon and evening.

Thunderstorms remain in the forecast for Thursday through Monday.

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

Mahale

In the hours before

Special weather statement, May 1, 1:48 AM CDT, 3 hours 7 minutes before

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Special weather statement, May 1, 2:06 AM CDT, 2 hours 49 minutes before

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Special weather statement, May 1, 2:35 AM CDT, 2 hours 20 minutes before

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Special weather statement, May 1, 3:05 AM CDT, 1 hour 50 minutes before

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Special weather statement, May 1, 3:07 AM CDT, 1 hour 48 minutes before

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Special weather statement, May 1, 3:43 AM CDT, 1 hour 12 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
Apr 30, 7:00 PM CDT	Special Weather Statement	OUN	Caddo	30 min
Apr 30, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	43 min
Apr 30, 7:14 PM CDT	Flash Flood Warning	OUN	Cleveland, McClain, Pottawatomie	3 hr
Apr 30, 7:22 PM CDT	Flash Flood Warning	OUN	Carter, Cotton, Garvin, Grady, Jefferson, McClain and 1 more	3 hr
Apr 30, 7:46 PM CDT	Special Weather Statement	OUN	Cotton	29 min
Apr 30, 7:49 PM CDT	Special Weather Statement	OUN	Comanche	26 min
Apr 30, 7:51 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson	39 min
Apr 30, 7:53 PM CDT	Areal Flood Advisory	OUN	Comanche, Cotton	2 hr
Apr 30, 8:20 PM CDT	Areal Flood Advisory	OUN	Garvin, Hughes, McClain, Pontotoc, Pottawatomie, Seminole	115 min
Apr 30, 8:28 PM CDT	Special Weather Statement	OUN	Jefferson	32 min
Apr 30, 8:35 PM CDT	Areal Flood Advisory	OUN	Carter, Cotton, Garvin, Jefferson, Murray, Pontotoc and 1 more	3 hr
Apr 30, 8:35 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	40 min
Apr 30, 8:59 PM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Carter, Coal, Jefferson, Johnston and 3 more	3 hr
Apr 30, 9:07 PM CDT	Tornado Warning	OUN	Atoka, Bryan	23 min
Apr 30, 9:12 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	48 min
Apr 30, 9:14 PM CDT	Tornado Warning	OUN	Atoka, Coal	46 min
Apr 30, 9:22 PM CDT	Flash Flood Warning	OUN	Carter, Murray	3 hr
Apr 30, 9:25 PM CDT	Tornado Warning Tornado observed	OUN	Atoka, Bryan	50 min
Apr 30, 9:44 PM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Hughes, Johnston, Pontotoc, Seminole	3 hr
Apr 30, 9:52 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	18 min
Apr 30, 10:16 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	44 min
Apr 30, 10:31 PM CDT	Areal Flood Warning	OUN	Atoka, Bryan, Carter, Coal, Johnston, Marshall and 2 more	3 hr
Apr 30, 10:48 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	42 min
Apr 30, 11:24 PM CDT	Flash Flood Warning	OUN	Atoka, Carter, Coal, Johnston, Murray	4 hr
Apr 30, 11:26 PM CDT	Special Weather Statement	OUN	Jackson	34 min
Apr 30, 11:39 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	51 min
Apr 30, 11:54 PM CDT	Flash Flood Warning	OUN	Atoka, Coal	4 hr
May 1, 12:07 AM CDT	Special Weather Statement	OUN	Kiowa	23 min
May 1, 12:37 AM CDT	Special Weather Statement	OUN	Comanche	23 min
May 1, 12:50 AM CDT	Special Weather Statement	OUN	Kiowa	25 min
May 1, 1:04 AM CDT	Special Weather Statement	OUN	Hughes, Seminole	26 min
May 1, 1:05 AM CDT	Special Weather Statement	OUN	Comanche	25 min
May 1, 1:07 AM CDT	Special Weather Statement	OUN	Comanche	23 min
May 1, 1:18 AM CDT	Areal Flood Advisory	OUN	Comanche	117 min
May 1, 1:24 AM CDT	Special Weather Statement	OUN	Grady, Stephens	36 min
May 1, 1:48 AM CDT	Special Weather Statement	OUN	Cleveland, McClain	27 min
May 1, 1:56 AM CDT	Areal Flood Advisory	OUN	Stephens	2 hr
May 1, 2:04 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	26 min
May 1, 2:06 AM CDT	Special Weather Statement	OUN	Cleveland	24 min
May 1, 2:24 AM CDT	River Flood Warning	OUN	Comanche, Cotton	26 hr
May 1, 2:35 AM CDT	River Flood Warning	OUN	Bryan	3 days
May 1, 2:35 AM CDT	Special Weather Statement	OUN	Garvin, Murray, Pottawatomie	25 min
May 1, 2:37 AM CDT	River Flood Warning	OUN	Atoka	27 hr
May 1, 3:05 AM CDT	Special Weather Statement	OUN	Murray	25 min
May 1, 3:07 AM CDT	Special Weather Statement	OUN	Hughes, Seminole	23 min
May 1, 3:27 AM CDT	Areal Flood Warning	OUN	Atoka, Carter, Coal, Johnston, Murray	3 hr
May 1, 3:43 AM CDT	Special Weather Statement	OUN	Murray	32 min
May 1, 6:26 AM CDT	Flash Flood Warning	OUN	Atoka, Coal	3 hr
May 1, 9:06 AM CDT	River Flood Warning	OUN	Cotton	11 hr
May 1, 10:25 AM CDT	Special Weather Statement	OUN	Coal	35 min
May 1, 11:08 AM CDT	Special Weather Statement	OUN	Atoka	37 min
May 1, 12:23 PM CDT	Special Weather Statement	OUN	Stephens	22 min
May 1, 12:39 PM CDT	Special Weather Statement	OUN	Garvin	21 min
May 1, 12:52 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	38 min
May 1, 12:58 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray, Stephens	47 min
May 1, 1:18 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	42 min
May 1, 1:29 PM CDT	Tornado Warning Tornado observed	OUN	Jefferson	31 min
May 1, 1:37 PM CDT	Tornado Warning	OUN	Garvin	53 min
May 1, 1:41 PM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Grady, Jefferson, Stephens	3 hr
May 1, 1:41 PM CDT	Tornado Warning	OUN	Cotton, Jefferson, Stephens	19 min
May 1, 1:54 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	51 min
May 1, 1:58 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	47 min
May 1, 2:01 PM CDT	Tornado Warning	OUN	Carter, Jefferson, Stephens	44 min
May 1, 2:02 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	43 min
May 1, 2:10 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson	50 min
May 1, 2:27 PM CDT	Severe Thunderstorm Warning	OUN	McClain	33 min
May 1, 2:40 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain	29 min
May 1, 2:42 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pottawatomie	20 min
May 1, 2:43 PM CDT	Flash Flood Warning	OUN	Carter, Garvin, Grady, Stephens	3 hr
May 1, 2:43 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	20 min
May 1, 2:47 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	58 min
May 1, 2:49 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	41 min
May 1, 2:54 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	30 min
May 1, 2:57 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	12 min
May 1, 3:18 PM CDT	Tornado Warning	OUN	Carter, Stephens	27 min
May 1, 3:19 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	41 min
May 1, 3:39 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	66 min
May 1, 3:42 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	48 min
May 1, 3:48 PM CDT	Tornado Warning	OUN	Carter, Stephens	27 min
May 1, 3:52 PM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Murray	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.