Alert archive / Oklahoma / Flash Flood Warnings in 2020

Flash Flood Warning 13, NWS Norman, OK

May 15, 20204 counties in Oklahoma; Wilbarger County, Texas

NWS Norman, OK issued this flash flood warning at May 15, 2020, 6:04 PM CDT for 4 counties in Oklahoma; Wilbarger County, Texas. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 15, 2020, 6:04 PM CDT (23:04 UTC)
Expired
May 15, 2020, 9:00 PM CDT
In force
3 hr
Issued by
NWS Norman, OK
Area
Storm-based polygon
Flood severity
None

Counties Comanche County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 46 km from the middle of the area, began a volume at 23:05 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.

What was reported inside it

TimeReportWhereRemark
May 15, 6:40 PM CDTFLASH FLOODNw Altus, OKHIGH WATER RESCUE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.1 hours before the alert went out and 169 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 12:00Z on 2020-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1862 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2020-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 292 square meters per square second.193958Sfc1 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
1862 J/kg
Mixed-layer CIN
-241 J/kg
Mixed-layer LCL
909 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
292 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

793 
WGUS54 KOUN 152304
FFWOUN
OKC031-065-075-141-TXC487-160200-
/O.NEW.KOUN.FF.W.0013.200515T2304Z-200516T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Norman OK
604 PM CDT Fri May 15 2020

The National Weather Service in Norman has issued a

* Flash Flood Warning for...
  Northwestern Comanche County in southwestern Oklahoma...
  Jackson County in southwestern Oklahoma...
  Kiowa County in southwestern Oklahoma...
  Northwestern Tillman County in southwestern Oklahoma...
  North central Wilbarger County in northern Texas...

* Until 900 PM CDT.

* At 602 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have 
  already fallen from near Altus to Cooperton. Flash flooding is 
  ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Altus, Snyder, Tipton, Blair, Olustee, Mountain Park, Roosevelt,
  Gotebo, Manitou, Martha, Elmer, Headrick, Friendship, Cooperton,
  Altus Air Force Base, Tom Steed Reservoir, Warren, Humphreys,
  western Fort Sill and Wichita Mountains Wildlife Refuge.

Additional rainfall amounts of 2 to 3 inches are possible in the 
warned area as heavy rainfall is expected to increase across the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3469 9948 3482 9929 3481 9925 3484 9926
      3509 9888 3506 9862 3476 9864 3432 9917
      3443 9955

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

TL
2 follow-up statements
200 
WGUS74 KOUN 152348
FFSOUN

Flash Flood Statement
National Weather Service Norman OK
648 PM CDT Fri May 15 2020

OKC031-065-075-141-TXC487-160200-
/O.CON.KOUN.FF.W.0013.000000T0000Z-200516T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Comanche OK-Jackson OK-Kiowa OK-Tillman OK-Wilbarger TX-
648 PM CDT Fri May 15 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
NORTHWESTERN COMANCHE...JACKSON...KIOWA...NORTHWESTERN TILLMAN AND
NORTH CENTRAL WILBARGER COUNTIES...

At 643 PM CDT, trained spotters reported a high water rescue in 
northwest Altus. Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Up to three inches of rain have 
already fallen near Tom Steed Reservoir. 

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Trained weather spotters.

IMPACT...Flooding of small creeks and streams, urban areas, 
         highways, streets and underpasses as well as other drainage 
         and low lying areas.

Additional rainfall amounts of 2 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3469 9948 3482 9929 3481 9925 3484 9926
      3509 9888 3506 9862 3476 9864 3432 9917
      3443 9955

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

TL
571 
WGUS74 KOUN 160156
FFSOUN

Flash Flood Statement
National Weather Service Norman OK
856 PM CDT Fri May 15 2020

OKC031-065-075-141-TXC487-160203-
/O.EXP.KOUN.FF.W.0013.000000T0000Z-200516T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Comanche OK-Jackson OK-Kiowa OK-Tillman OK-Wilbarger TX-
856 PM CDT Fri May 15 2020

...THE FLASH FLOOD WARNING FOR NORTHWESTERN COMANCHE...JACKSON...
KIOWA...NORTHWESTERN TILLMAN AND NORTH CENTRAL WILBARGER COUNTIES
WILL EXPIRE AT 900 PM CDT...

Heavy rainfall and earlier flooding has receded. Flash flooding is 
no longer expected to pose a threat. Please continue to heed any 
remaining road closures.

LAT...LON 3469 9948 3482 9929 3481 9925 3484 9926
      3509 9888 3506 9862 3476 9864 3432 9917
      3443 9955

$$

TL

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 8:10 PM CDTSpecial Weather StatementOUNMajor35 min
May 14, 8:17 PM CDTSevere Thunderstorm WarningOUNMajor, Woods, Woodward43 min
May 14, 8:25 PM CDTSpecial Weather StatementOUNEllis35 min
May 14, 8:52 PM CDTSevere Thunderstorm WarningOUNMajor, Woods68 min
May 14, 9:04 PM CDTSpecial Weather StatementOUNEllis26 min
May 14, 9:10 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Woodward50 min
May 14, 9:26 PM CDTSpecial Weather StatementOUNEllis34 min
May 14, 9:41 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woodward49 min
May 14, 9:51 PM CDTSevere Thunderstorm WarningOUNBlaine, Major, Woods54 min
May 14, 10:19 PM CDTAreal Flood AdvisoryOUNMajor3 hr
May 14, 10:31 PM CDTSevere Thunderstorm WarningOUNBlaine, Major, Woods59 min
May 14, 11:23 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Major, Woods52 min
May 15, 12:07 AM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Major32 min
May 15, 1:18 AM CDTSpecial Weather StatementOUNGarfield27 min
May 15, 10:59 AM CDTFlood WatchOUNAtoka, Bryan, Carter, Cleveland, Coal, Comanche and 17 more16 hr
May 15, 12:16 PM CDTSpecial Weather StatementOUNHughes29 min
May 15, 12:32 PM CDTSpecial Weather StatementOUNPottawatomie28 min
May 15, 12:41 PM CDTSevere Thunderstorm WarningOUNCleveland, Pottawatomie49 min
May 15, 12:57 PM CDTAreal Flood AdvisoryOUNHughes, Pottawatomie, Seminole3 hr
May 15, 1:13 PM CDTSevere Thunderstorm WarningOUNCleveland, McClain, Pottawatomie47 min
May 15, 1:27 PM CDTSpecial Weather StatementOUNCleveland33 min
May 15, 1:38 PM CDTAreal Flood AdvisoryOUNCleveland, Pottawatomie3 hr
May 15, 1:40 PM CDTSevere Thunderstorm WarningOUNCleveland, McClain35 min
May 15, 2:15 PM CDTSpecial Weather StatementOUNMcClain30 min
May 15, 2:20 PM CDTSpecial Weather StatementOUNGrady25 min
May 15, 2:21 PM CDTAreal Flood AdvisoryOUNCleveland, Garvin, Grady, McClain, Stephens114 min
May 15, 2:42 PM CDTSpecial Weather StatementOUNGarvin, Grady33 min
May 15, 2:57 PM CDTSevere Thunderstorm WarningOUNGrady33 min
May 15, 3:07 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady23 min
May 15, 3:12 PM CDTAreal Flood AdvisoryOUNCaddo, Comanche, Grady63 min
May 15, 3:21 PM CDTSpecial Weather StatementOUNPontotoc39 min
May 15, 3:26 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady34 min
May 15, 3:31 PM CDTFlash Flood WarningOUNCaddo, Comanche, Grady, Stephens119 min
May 15, 3:33 PM CDTSpecial Weather StatementOUNStephens27 min
May 15, 3:40 PM CDTSpecial Weather StatementOUNJackson50 min
May 15, 3:47 PM CDTSpecial Weather StatementOUNCoal43 min
May 15, 3:47 PM CDTSevere Thunderstorm WarningOUNComanche43 min
May 15, 3:48 PM CDTSpecial Weather StatementOUNGarvin27 min
May 15, 4:00 PM CDTSpecial Weather StatementOUNCaddo30 min
May 15, 4:07 PM CDTSpecial Weather StatementOUNAtoka53 min
May 15, 4:10 PM CDTSevere Thunderstorm WarningOUNComanche, Grady, Stephens35 min
May 15, 4:13 PM CDTFlash Flood WarningOUNCarter, Garvin, Murray, Stephens3 hr
May 15, 4:15 PM CDTRiver Flood WarningOUNPottawatomie, Seminole11 hr
May 15, 4:17 PM CDTSpecial Weather StatementOUNGarvin28 min
May 15, 4:22 PM CDTSpecial Weather StatementOUNHarmon53 min
May 15, 4:28 PM CDTSpecial Weather StatementOUNKiowa17 min
May 15, 4:28 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Murray47 min
May 15, 4:43 PM CDTSevere Thunderstorm WarningOUNGrady, Stephens32 min
May 15, 4:53 PM CDTSpecial Weather StatementOUNComanche37 min
May 15, 4:59 PM CDTSevere Thunderstorm WarningOUNHarmon, Jackson61 min
May 15, 5:03 PM CDTSpecial Weather StatementOUNBryan42 min
May 15, 5:12 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, Stephens33 min
May 15, 5:13 PM CDTSpecial Weather StatementOUNGarvin47 min
May 15, 5:16 PM CDTSevere Thunderstorm WarningOUNJackson44 min
May 15, 5:18 PM CDTSpecial Weather StatementOUNMurray72 min
May 15, 5:22 PM CDTSpecial Weather StatementOUNGrady23 min
May 15, 5:23 PM CDTAreal Flood AdvisoryOUNCoal, Garvin, Murray, Pontotoc, Seminole2 hr
May 15, 5:23 PM CDTSpecial Weather StatementOUNKiowa37 min
May 15, 5:28 PM CDTFlash Flood WarningOUNCaddo, Comanche, Cotton, Garvin, Grady, Stephens92 min
May 15, 5:32 PM CDTAreal Flood AdvisoryOUNComanche, Jackson, Kiowa, Tillman118 min
May 15, 5:35 PM CDTSevere Thunderstorm WarningOUNCaddo25 min
May 15, 5:41 PM CDTAreal Flood AdvisoryOUNHarmon, Jackson2 hr
May 15, 5:41 PM CDTSpecial Weather StatementOUNCaddo34 min
May 15, 5:48 PM CDTSpecial Weather StatementOUNTillman42 min
May 15, 5:52 PM CDTSpecial Weather StatementOUNStephens23 min
May 15, 5:57 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman63 min
May 15, 5:58 PM CDTSpecial Weather StatementOUNStephens32 min
May 15, 6:03 PM CDTSevere Thunderstorm WarningOUNStephens27 min
May 15, 6:06 PM CDTSevere Thunderstorm WarningOUNCaddo, Grady8 min
May 15, 6:12 PM CDTSevere Thunderstorm WarningOUNTillman63 min
May 15, 6:20 PM CDTSpecial Weather StatementOUNComanche25 min
May 15, 6:25 PM CDTSevere Thunderstorm WarningOUNComanche26 min
May 15, 6:26 PM CDTSevere Thunderstorm WarningOUNStephens34 min
May 15, 6:35 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman40 min
May 15, 6:44 PM CDTFlash Flood WarningOUNGarvin, Stephens91 min
May 15, 6:57 PM CDTSevere Thunderstorm WarningOUNGarvin, Stephens48 min
May 15, 6:58 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman77 min
May 15, 6:59 PM CDTFlash Flood WarningOUNCaddo, Comanche, Grady, Tillman3 hr
May 15, 4:48 PM CDTSpecial Weather StatementOUNHardeman42 min
May 15, 5:56 PM CDTSevere Thunderstorm WarningOUNHardeman64 min

Nearby

Flash Flood Warnings in Oklahoma, 2020Flash Flood Warnings in Texas, 2020Every flash flood warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.