Alert archive / Oklahoma / Flash Flood Warnings in 2015

Flash Flood Warning 114, NWS Norman, OK

June 21, 2015Bryan County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jun 21, 2015, 10:04 AM CDT for Bryan County, Oklahoma. It was in force for 6 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, 10:04 AM CDT (15:04 UTC)
Expired: Jun 21, 2015, 4:00 PM CDT
In force: 6 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

County Bryan County, OK

The radar

The Norman radar (KTLX), 179 km from the middle of the area, began a volume at 15:06 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, 3.1 hours before the alert went out and 158 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, 6:33 AM CDT, 3 hours 31 minutes earlier.

Area forecast discussion, Jun 21, 6:33 AM CDT, 3 hours 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
633 AM CDT SUN JUN 21 2015

.DISCUSSION...
21/12Z TAF DISC BELOW.

&&

.AVIATION...
VFR CONDITIONS EXPECTED WITH GUSTY S/SW WINDS ACROSS TERMINALS.
SOME LOW CLOUD DEVELOPMENT ACROSS WESTERN NORTH TEXAS INTO
SOUTHWEST OKLAHOMA CANNOT BE RULED OUT EARLY THIS MORNING...BUT
CONFIDENCE TOO LOW TO MENTION IN FORECAST. WILL INCLUDE SCT-BKN
VFR CU 16-00Z ALL BUT FAR WEST AND NORTHERN OKLAHOMA TERMINALS.

&&

.PREV DISCUSSION... /ISSUED 421 AM CDT SUN JUN 21 2015/

DISCUSSION...
SCATTERED TO NUMEROUS SHOWERS...ALONG WITH A FEW WEAK STORMS...
POSSIBLE MAINLY ACROSS THE RED RIVER VALLEY EAST OF I-35 TODAY.
LATEST HI-RES MODEL DATA AND OBSERVATIONAL TRENDS INDICATE AREAS
NEAR AND EAST OF LAKE TEXOMA STAND THE BEST SHOT AT BRIEF SHOWERS
AND POSSIBLY A STORM MID-MORNING THROUGH EARLY AFTERNOON AS WEAK
MID-LEVEL LOW BRUSHES AREA. EXCESSIVE RAINFALL AMOUNTS ARE NOT
EXPECTED AND WE CURRENTLY DO NOT EXPECT ANY SUBSTANTIAL EFFECT ON
THE CURRENT FLOODING SITUATION OVER SOUTH-CENTRAL AND SOUTHEAST
OKLAHOMA.

FLAT UPPER RIDGE STILL PROGD TO BUILD OVER REGION TOMORROW THROUGH
MOST OF THE WEEK LEADING TO HOT AND MUGGY CONDITIONS WITH LITTLE
OR NO CHANCE FOR RAIN. DEVELOPMENT OF NORTHWEST FLOW WITH RIDGE
BREAKDOWN ANTICIPATED FOR NEXT WEEKEND. MEDIUM RANGE FORECASTS
DIFFER ON TIMING OF POTENTIAL FRONT BUT CONSENSUS BLEND OF POPS
AND TEMP DECREASE GENERALLY ACCEPTED AND KEPT IN LATEST FORECAST.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  91  73  92  74 /  10   0   0   0
HOBART OK         93  71  95  72 /  10   0   0   0
WICHITA FALLS TX  92  72  95  73 /  20  10   0   0
GAGE OK           94  71  95  70 /  10   0   0   0
PONCA CITY OK     94  75  95  76 /  10   0   0   0
DURANT OK         87  74  94  73 /  60  10   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

04/11

Hazardous weather outlook, Jun 21, 5:42 AM CDT, 4 hours 22 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, 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, 12:39 PM CDT	Flash Flood Warning	OUN	Marshall	5 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.