Alert archive / Oklahoma / Flash Flood Warnings in 2001

Flash Flood Warning 8, NWS Norman, OK

June 27, 2001Johnston County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jun 27, 2001, 11:19 AM CDT for Johnston 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 27, 2001, 11:19 AM CDT (16:19 UTC)
Expired: Jun 27, 2001, 2:15 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Johnston County, OK

The radar

The Norman radar (KTLX), 131 km from the middle of the area, began a volume at 16:23 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 12:00Z, 4.3 hours before the alert went out and 124 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: 1226 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1120 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KOUN 271620
FFWOKC
OKC069-271915-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1119 AM CDT WED JUN 27 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 215 PM CDT

* AT 1119 AM CDT...DOPPLER RADAR DETECTED THAT NEARLY 4 INCHES OF 
RAIN HAD FALLEN IN TISHOMINGO THIS MORNING. ADDITIONAL THUNDERSTORMS 
COULD PRODUCE ANOTHER 1 TO 3 INCHES OF RAIN BEFORE ENDING THIS 
AFTERNOON.

* LOCATIONS IN THE WARNING INCLUDE RAVIA...REAGAN AND TISHOMINGO

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.

LAT...LON 3419 9686 3418 9662 3431 9655 3436 9678
JAMES

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 27, 10:52 AM CDT, 27 minutes earlier.

Area forecast discussion, Jun 27, 10:52 AM CDT, 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1052 AM CDT WED JUN 27 2001

THIN BAND OF STRONG TO OCCASIONALLY SEVERE CONVECTION CONTINUES
MAINLY EAST OF I-35 THIS MORNING.  RUC SHOWS WAA WEAKENING THIS
MORNING AS WINDS BACK WITH BEST AREA OF CONTINUED DEVELOPMENT
ACROSS SOUTHEAST COUNTIES.  CLOUDS AND RAIN WILL KEEP AFTERNOON
HIGHS LOWER THAN GOING FORECAST AND WILL ALSO HELP IN MORE DEVELOPMENT
THIS AFTERNOON.

.OUN...
OK...NONE.
TX...NONE.

6

In the hours before

Special weather statement, Jun 27, 7:00 AM CDT, 4 hours 19 minutes before

OKZ004>048-050>052-TXZ083>090-271430-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
700 AM CDT WED JUN 27 2001

NO ORGANIZED HAZARDOUS WEATHER IS EXPECTED TODAY OR TONIGHT ACROSS
WESTERN...CENTRAL OR SOUTHEAST OKLAHOMA...OR WESTERN NORTH TEXAS.

SCATTERED THUNDERSTORM ACTIVITY WILL BE POSSIBLE ACROSS ALL BUT
EXTREME WESTERN PORTIONS OF OKLAHOMA AND NORTH TEXAS TODAY AND
TONIGHT...AS AN UPPER LEVEL STORM SYSTEM SLOWLY MOVES TOWARD THE
REGION FROM THE MID MISSISSIPPI RIVER VALLEY. WITH ONLY MARGINAL
INSTABILITY AND WEAK VERTICAL WIND SHEAR...NO ORGANIZED SEVERE
THUNDERSTORM ACTIVITY IS EXPECTED THROUGH TONIGHT...ALTHOUGH SOME OF
THE STRONGER STORMS COULD PRODUCE SMALL HAIL AND STRONG WIND GUSTS.

ON THURSDAY...THUNDERSTORM CHANCES WILL INCREASE...ESPECIALLY DURING
THE AFTERNOON AND EVENING HOURS. AS THE UPPER LEVEL STORM SYSTEM
MOVES CLOSER...COOLING OF THE MID AND UPPER LEVELS OF THE ATMOSPHERE
AND SLIGHTLY HIGHER WIND SHEAR VALUES WILL RESULT IN AN INCREASED
THREAT FOR SEVERE THUNDERSTORMS. THE LATEST NUMERICAL MODEL DATA
SUGGESTS THAT ISOLATED SUPERCELLS WILL BE POSSIBLE THURSDAY AS WIND
SPEEDS INCREASE AND THE VERTICAL WIND PROFILE REMAINS STRONGLY
VEERED. IF THIS SCENARIO HOLDS TRUE...LARGE HAIL AND DAMAGING WIND
GUSTS WOULD BE THE PRIMARY THREATS.

ALTHOUGH NO SPOTTER ACTIVATION IS EXPECTED THROUGH TONIGHT...IT MAY
BE NECESSARY ON THURSDAY AS THE SEVERE WEATHER THREAT IS EXPECTED TO
INCREASE. STAY TUNED TO NOAA WEATHER RADIO...AMATEUR RADIO NETS...OR
YOUR FAVORITE TV AND RADIO STATIONS FOR THE LATEST STATEMENTS AND
FORECASTS.

11

Local storm report, Jun 27, 10:10 AM CDT, 1 hour 9 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1010 AM CDT WED JUN 27 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1001 AM    8 S CHOCTAW               OK   1.00 INCH HAIL
06/27/01   OKLAHOMA                       STORM SPOTTER

CW

Local storm report, Jun 27, 10:25 AM CDT, 54 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1025 AM CDT WED JUN 27 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0946 AM    P.O. IN CONNERVILLE       OK   .88 INCH HAIL
06/27/01   JOHNSTON                       PUBLIC REPORT

0945 AM    1 S NEWALLA               OK   1.75 INCH HAIL
06/27/01   OKLAHOMA                       PUBLIC REPORT

CW

Local storm report, Jun 27, 10:31 AM CDT, 48 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1031 AM CDT WED JUN 27 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1020 AM    1 E CHOCTAW               OK   1.00 INCH HAIL
06/27/01   OKLAHOMA                       RPT BY FIRE DPT.

CW

Local storm report, Jun 27, 10:44 AM CDT, 35 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1044 AM CDT WED JUN 27 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1044 AM    P.D. IN TISHOMINGO        OK   .75 INCH HAIL
06/27/01   JOHNSTON

CW

Local storm report, Jun 27, 11:12 AM CDT, 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1112 AM CDT WED JUN 27 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1110 AM    IN CHOCTAW                OK   1.00 INCH HAIL
06/27/01   OKLAHOMA                       BY PUBLIC

1112 AM    1/2 MI S I-240 ON PEEBLY OK   FLOODING
06/27/01   OKLAHOMA                       FLOODING ACROSS ROAD. ROAD
                                          INPASSABLE. BY NWS
                                          EMPLOYEE.

CW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 9:10 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	50 min
Jun 27, 9:43 AM CDT	Severe Thunderstorm Warning	OUN	Johnston	47 min
Jun 27, 9:57 AM CDT	Flash Flood Warning	OUN	Cleveland, Oklahoma, Pottawatomie	3 hr
Jun 27, 10:01 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	44 min
Jun 27, 10:38 AM CDT	Severe Thunderstorm Warning	OUN	Johnston	52 min
Jun 27, 11:08 AM CDT	Severe Thunderstorm Warning	OUN	Logan	52 min
Jun 27, 11:12 AM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	48 min
Jun 27, 11:16 AM CDT	Severe Thunderstorm Warning	OUN	Atoka	59 min
Jun 27, 12:11 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	49 min
Jun 27, 6:50 PM CDT	Severe Thunderstorm Warning	OUN	Custer	25 min

Nearby

Flash Flood Warnings in Oklahoma, 2001 Every flash flood warning in 2001

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.