Alert archive / Oklahoma / Flash Flood Warnings in 1999

Flash Flood Warning 65, NWS Tulsa, OK

June 20, 1999Cherokee County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Jun 20, 1999, 4:15 AM CDT for Cherokee County, 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jun 20, 1999, 4:15 AM CDT (09:15 UTC)
Expired: Jun 20, 1999, 7:00 AM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cherokee County, OK

The radar

The Tulsa radar (KINX), 48 km from the middle of the area, began a volume at 09:14 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, 9.3 hours before the alert went out and 150 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1446 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 85 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 
TTAA00 KTUL 200918
FFWTUL
OKC021-201200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
415 AM CDT SUN JUN 20 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* FLASH FLOOD WARNING FOR
  NORTHERN CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 700 AM CDT

* AT 415 AM CDT RADAR INDICATED THAT FROM 3 TO 6 INCHES OF RAIN HAD 
FALLEN OVER PARTS OF NORTHERN CHEROKEE COUNTY IN THE PEGGS AREA WITH 
2 TO 4 INCHES EXTENDING TO NEAR TAHELQUAH. THUNDERSTORMS WILL 
DIMINISH IN THE AREA THROUGH 6AM BUT RUNOFF WILL CAUSE FLASH 
FLOODING ALONG SMALL CREEKS AND STREAMS AND IN URBAN AREAS. THE 
BLACKBIRD...CLEAR AND FOURTEENMILE CREEKS MAY FLOOD. 

PEGGS...TAHLEQUAH AND ADJACENT COMMUNITIES MAY BE AFFECTED BY 
FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

LAT...LON 3606 9518 3592 9511 3591 9482 3616 9506
          3608 9511

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 Tulsa, OK wrote its last area forecast discussion before this flash flood warning went out at Jun 20, 4:00 AM CDT, 15 minutes earlier.

Area forecast discussion, Jun 20, 4:00 AM CDT, 15 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
400 AM CDT SUN JUN 20 1999

PROBLEM(S) OF THE DAY:
WILL THE CONVECTION BE SCATTERED OR NUMEROUS?
HOW MUCH RAIN WILL FALL?
CLOUDS
TEMPERATURES

H85 WAA PATTERN OVER ERN OK THIS MORNING HAS RESULTED IN ADDITIONAL
SHRA/TSRA ACTIVITY. MODELS IN DECENT AGREEMENT WITH ONE ANOTHER...BUT
ALL HAVE PERFORMED POORLY IN HANDLING PRECIP AND CLOUDS THE LAST FEW
RUNS. 00Z ETA HANDLES CURRENT PRECIP BEST...BUT DONT HAVE ANY FEEL
FOR ONE MODEL OR THE OTHER. ALL AGREE HOWEVER THAT WAA/ISENTROPIC
LIFT SHUTS OFF BY THIS AFTERNOON. WILL CONFINE POPS OVER MOST ZONES
TO MORNING AND GO AHEAD WITH HIGHEST POPS IN ERN ZONES. WONT USE ANY
TEMPORAL WORDING ACROSS SE OK AND WC AR AS MORE SUN AND HIGHER
INSTABILITIES MAY LEAD TO SOME TSRA THIS AFTERNOON. ATMOSPHERE LOOKS
TO REMAIN WEAKLY CAPPED FOR MONDAY. NO REAL FOCUS FOR CONVECTIVE
INITIATION BUT A FEW LATE AFT STORMS WILL BE POSSIBLE...ESP OVER SE
OK AND NW AR. WILL GO AHEAD AND BROADBRUSH ALL ZONES WITH SLIGHT
CHANCE POPS MON AND MON EVE. AS FOR TEMPERATURES...UNDERCUT GUIDANCE
FOR FIRST PERIOD TO ACCOUNT FOR MORE CLOUD COVER. THINK SE OK AND WC
AR WILL SEE MORE SUN SO DID NOT DEVIATE AS MUCH. LATER PERIODS LOOK
FAIRLY RESONABLE SO WILL STICK FAIRLY CLOSE.

IN THE EXTENDED...WEAKLY CAPPED ATMOSPHERE REMAINS IN PLACE THROUGH
EXTENDED PERIOD. MODEL SOLUTIONS VARY TO SOME DEGREE WITH PLACEMENT
ANS STRENGTH OF UPPER RIDGE. MODELS HAVE CONTINUED TO SUPPRESS RIDGE
TO THE SW U.S. STILL NO REAL FOCUS FOR CONVECTION BUT A WEAKLY CAPPED
ENVIRONMENT MAY LEAD TO SCT AFTERNOON TSRA WILL GO WITH SLIGHT CHANCE
POPS.

FCSTID = 23
TUL   81  68  87  69 /  40  10  20  20
FSM   82  67  88  67 /  70  20  20  20
MLC   84  67  88  67 /  30  20  20  20
BVO   81  65  87  67 /  40  10  20  20
FYV   79  63  85  66 /  70  10  20  20
IDB   87  65  89  66 /  20  20  20  20
BYV   79  63  85  66 /  70  10  20  20
MIO   80  65  86  66 /  70  10  20  20
MKO   81  68  87  69 /  40  10  20  20
F10   81  68  87  69 /  40  10  20  20
HHW   87  65  89  66 /  20  20  20  20

.TUL...
AR...NONE.
OK...NONE.

--------------------
EXPERIMENTAL OUTPUT:

HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS:  NONE
NGM CONFIDENCE:  5 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  5 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  5 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 5 ON A SCALE OF 0 TO 10

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 5:40 AM CDT	Flash Flood Warning	TSA	Mayes	3 hr
Jun 20, 6:49 AM CDT	Flash Flood Warning	TSA	Cherokee	2 hr
Jun 20, 7:50 AM CDT	Flash Flood Warning	TSA	Rogers	3 hr
Jun 20, 7:58 AM CDT	Flash Flood Warning	TSA	Craig	3 hr
Jun 20, 8:21 AM CDT	Flash Flood Warning	TSA	Cherokee, Mayes	2 hr
Jun 20, 10:45 AM CDT	Flash Flood Warning	TSA	Craig, Nowata, Rogers	2 hr

Nearby

Flash Flood Warnings in Oklahoma, 1999 Every flash flood warning in 1999

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.