Alert archive / Oklahoma / Flash Flood Warnings in 2003

Flash Flood Warning 18, NWS Tulsa, OK

June 30, 2003Nowata County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Jun 30, 2003, 2:30 AM CDT for Nowata County, Oklahoma. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 30, 2003, 2:30 AM CDT (07:30 UTC)
Expired: Jun 30, 2003, 7:00 AM CDT
In force: 5 hr
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Nowata County, OK

The radar

The Tulsa radar (KINX), 73 km from the middle of the area, began a volume at 07:29 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

Springfield, MO (KSGF), launched 00:00Z, 7.5 hours before the alert went out and 165 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: 162 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1766 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KTSA 300732
FFWTUL
OKC105-301200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
230 AM CDT MON JUN 30 2003

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* FLASH FLOOD WARNING FOR
  NOWATA COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 700 AM CDT

* AT 230 AM CDT RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN
  ALONG A LINE EXTENDING FROM 60 MILES WEST OF DELAWARE TO 3 MILES
  NORTHEAST OF LENAPAH...MOVING EAST AT 10 MPH. RADAR INDICATES THAT 
  3 TO 4 INCHES OF RAIN HAS ALREADY FALLEN OVER NORTHERN NOWATA      
  COUNTY. ANOTHER 1 TO 2 INCHES WILL BE POSSIBLE THROUGH 700 AM CDT.

* SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN
  INCLUDE DELAWARE AND LENAPAH.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLASH FLOODS. IT IS VERY DIFFICULT AT NIGHT TO TELL HOW 
MUCH WATER IS ON THE ROADS. IT ONLY TAKES TWO FEET OF RUSHING WATER 
TO CARRY AWAY MOST SPORT UTILITY VEHICLES AND PICKUPS. MOTORISTS 
SHOULD NOT DRIVE THROUGH WATER OF UNKNOWN DEPTH. TAKE A DIFFERENT 
ROUTE TO REACH YOUR DESTINATION OR WAIT UNTIL THE WATER RECEDES.

LAT...LON 3672 9580 3673 9543 3700 9543 3696 9580

$$

2 follow-up statements

000 
WGUS74 KTSA 300956
FFSTUL
OKC105-301200-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
455 AM CDT MON JUN 30 2003

...FLASH FLOOD WARNING CONTINUES FOR NOWATA COUNTY UNTIL 700 AM
   CDT...

AT 455 AM CDT...RADAR CONTINUED TO SHOW THUNDERSTORMS WITH HEAVY 
RAIN ALONG A LINE EXTENDING FROM 5 MILES EAST OF LENAPAH TO 38 MILES 
WEST OF DELAWARE...MOVING EAST AT 15 MPH.

RADAR INDICATES THAT 4 TO 5 INCHES OF RAIN HAS ALREADY FALLEN OVER 
NORTHEAST NOWATA COUNTY. ANOTHER INCH WILL BE POSSIBLE THROUGH 700 
AM CDT.

SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY THE HEAVY RAIN
INCLUDE DELAWARE AND LENAPAH.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD TO
UNKNOWN DEPTHS. IT ONLY TAKES TWO FEET OF RUSHING WATER TO CARRY AWAY
MOST SPORT UTILITY VEHICLES AND PICKUPS. TAKE A DIFFERENT ROUTE TO
REACH YOUR DESTINATION OR WAIT UNTIL THE WATER RECEDES. REMEMBER...
MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES.

LAT...LON 3699 9571 3674 9569 3677 9544 3698 9545

$$

000 
WGUS74 KTSA 301155
FFSTUL
OKC105-301215-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
655 AM CDT MON JUN 30 2003

...FLASH FLOOD WARNING FOR NOWATA COUNTY WILL BE ALLOWED TO EXPIRE 
AT 700 AM CDT...

PERIODS OF LIGHT RAIN WILL BE POSSIBLE OVER NOWATA COUNTY FOR THE 
NEXT HOUR...BUT THE HEAVIEST RAINFALL HAS SHIFTED WELL SOUTH OF THE 
AREA. THEREFORE...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE 
AT 700 AM.

LAT...LON 3698 9582 3679 9579 3675 9544 3681 9544
          3698 9544

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 7:21 PM CDT	Flash Flood Warning	TSA	Rogers, Tulsa	3 hr

Nearby

Flash Flood Warnings in Oklahoma, 2003 Every flash flood warning in 2003

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.