Alert archive / Texas / Flood Watches in 2016

Flood Watch 3, NWS Norman, OK

April 20, 2016Harmon County, Jackson County, Tillman County, Oklahoma; 8 counties in Texas

NWS Norman, OK issued this flood watch at Apr 20, 2016, 3:54 AM CDT for Harmon County, Jackson County, Tillman County, Oklahoma; 8 counties in Texas. It took effect at Apr 20, 2016, 7:00 PM CDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Apr 20, 2016, 3:54 AM CDT (08:54 UTC)
In effect from
Apr 20, 2016, 7:00 PM CDT
Expired
Apr 20, 2016, 10:48 PM CDT
In force
4 hr
Issued by
NWS Norman, OK
Flood severity
None

Counties Harmon County, OK, Jackson County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 41 km from the middle of the area, began a volume at 08:57 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, 8.9 hours before the alert went out and 211 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2016-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 65 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2016-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
-27 J/kg
Mixed-layer LCL
1165 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch 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 flood watch went out at Apr 20, 3:50 AM CDT, 4 minutes earlier.

Area forecast discussion, Apr 20, 3:50 AM CDT, 4 minutes before
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Hazardous weather outlook, Apr 19, 8:04 PM CDT, 7 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
804 PM CDT TUE APR 19 2016

OKZ004>048-050>052-TXZ083>090-210115-
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-
804 PM CDT TUE APR 19 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

.DAY ONE...REST OF TONIGHT...

.THUNDERSTORMS...
STRONG TO SEVERE STORMS ARE POSSIBLE THROUGH 2 AM IN PARTS OF
SOUTHERN OKLAHOMA AND ALL OF WESTERN NORTH TEXAS... GENERALLY
SOUTH OF A LINE FROM QUANAH TEXAS... TO FREDERICK AND LAWTON... TO
PAULS VALLEY AND ADA OKLAHOMA. THE HIGHEST CHANCE FOR SEVERE
STORMS WILL BE IN PARTS OF WESTERN NORTH TEXAS. LARGE HAIL UP TO
THE SIZE OF TENNIS BALLS AND WIND GUSTS UP TO 70 MPH ARE THE MAIN
CONCERNS. THE SEVERE POTENTIAL WILL DECREASE OVERNIGHT... BUT
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS THE AREA
INTO WEDNESDAY MORNING.

.HEAVY RAINFALL...
HEAVY RAINFALL WILL BE POSSIBLE IN SOME AREAS THROUGH EARLY
WEDNESDAY. SOME LOCATIONS COULD RECEIVE ANOTHER ONE TO TWO INCHES
OF RAINFALL... ESPECIALLY ACROSS PORTIONS OF SOUTHWESTERN AND
CENTRAL OKLAHOMA. A FLOOD WATCH IS IN EFFECT.

.RIVER FLOODING...
HEAVY RAINFALL SINCE SATURDAY HAS ELEVATED LEVELS OF SEVERAL
RIVERS IN SOUTHERN OKLAHOMA AND NORTHERN TEXAS INTO FLOOD. DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD...AND CERTAINLY DO
NOT DRIVE AROUND BARRICADES.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

.HEAVY RAINFALL...
FLASH FLOODING WILL REMAIN POSSIBLE ACROSS SOUTHERN AND CENTRAL
OKLAHOMA...AND PORTIONS OF WESTERN NORTH TEXAS WEDNESDAY
AS HEAVY RAINFALL CONTINUES OVER THE REGION.

.RIVER FLOODING...
MANY RIVERS ACROSS SOUTHERN OKLAHOMA AND NORTHERN TEXAS WILL
LIKELY REMAIN ABOVE FLOOD STAGES THROUGH WEDNESDAY.

.THUNDERSTORMS...
THUNDERSTORMS WILL REMAIN POSSIBLE THROUGH EARLY THURSDAY.
THUNDERSTORM CHANCES WILL RETURN TO THE REGION SUNDAY AND MONDAY.
SEVERE STORMS APPEAR POSSIBLE DURING THIS TIME.

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, Apr 19, 11:21 PM CDT, 4 hours 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1121 PM CDT TUE APR 19 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1114 PM     HAIL             3 S MEAD                33.96N 96.51W
04/19/2016  E1.75 INCH       BRYAN              OK   PUBLIC

&&

EMAXWELL

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 7:38 PM CDTAreal Flood AdvisoryOUNBlaine, Caddo, Canadian, Comanche, Garfield, Kingfisher and 3 more112 min
Apr 19, 8:04 PM CDTSpecial Weather StatementOUNJefferson41 min
Apr 19, 8:14 PM CDTAreal Flood AdvisoryOUNComanche, Cotton, Grady, Jefferson, Stephens3 hr
Apr 19, 8:23 PM CDTAreal Flood AdvisoryOUNCaddo, Canadian, Cleveland, Comanche, Garfield, Garvin and 7 more3 hr
Apr 19, 8:34 PM CDTSpecial Weather StatementOUNJefferson56 min
Apr 19, 8:53 PM CDTAreal Flood AdvisoryOUNGarfield, Noble112 min
Apr 19, 9:17 PM CDTAreal Flood AdvisoryOUNCarter, Garvin, Grady, Jefferson, Johnston, Love and 4 more3 hr
Apr 19, 9:23 PM CDTSpecial Weather StatementOUNCarter, Love, Marshall, Murray52 min
Apr 19, 9:50 PM CDTAreal Flood AdvisoryOUNCotton, Jefferson, Tillman3 hr
Apr 19, 10:13 PM CDTSevere Thunderstorm WarningOUNBryan, Love, Marshall47 min
Apr 19, 10:36 PM CDTAreal Flood AdvisoryOUNBryan, Coal, Johnston, Marshall, Murray, Pontotoc3 hr
Apr 19, 10:53 PM CDTSevere Thunderstorm WarningOUNBryan, Marshall52 min
Apr 19, 11:41 PM CDTSevere Thunderstorm WarningOUNBryan20 min
Apr 19, 11:45 PM CDTAreal Flood AdvisoryOUNBryan, Love, Marshall3 hr
Apr 20, 9:25 AM CDTRiver Flood WarningOUNAtoka24 hr
Apr 19, 7:05 PM CDTSpecial Weather StatementOUNKnox25 min
Apr 19, 7:18 PM CDTSpecial Weather StatementOUNFoard27 min
Apr 19, 7:27 PM CDTSevere Thunderstorm WarningOUNArcher, Clay, Wichita48 min
Apr 19, 7:28 PM CDTSpecial Weather StatementOUNKnox32 min
Apr 19, 7:34 PM CDTSevere Thunderstorm WarningOUNFoard, Knox56 min
Apr 19, 8:19 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox, Wilbarger56 min
Apr 19, 8:25 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox50 min
Apr 19, 8:33 PM CDTFlash Flood WarningOUNBaylor, Knox3 hr
Apr 19, 9:08 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor, Knox67 min
Apr 19, 9:29 PM CDTSevere Thunderstorm WarningOUNArcher, Clay61 min
Apr 19, 10:18 PM CDTSevere Thunderstorm WarningOUNArcher, Clay42 min

Nearby

Flood Watches in Texas, 2016Flood Watches in Oklahoma, 2016Every flood watch in 2016

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.