Alert archive / Oklahoma / Flash Flood Watches in 2007
Flash Flood Watch 4, NWS Norman, OK
NWS Norman, OK issued this flash flood watch at Jun 18, 2007, 4:20 AM CDT for 13 counties in Oklahoma. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Jun 18, 2007, 4:20 AM CDT (09:20 UTC)
- Expired
- Jun 18, 2007, 4:00 PM CDT
- In force
- 12 hr
- Issued by
- NWS Norman, OK
- Flood severity
- None
Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK
The radar
The Norman radar (KTLX), 103 km from the middle of the area, began a volume at 09:22 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, 9.3 hours before the alert went out and 99 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.
- Mixed-layer CAPE
- 204 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 748 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash 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 flash flood watch went out at Jun 17, 9:28 PM CDT, 6 hours 52 minutes earlier.
Area forecast discussion, Jun 17, 9:28 PM CDT, 6 hours 52 minutes before
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</html>Hazardous weather outlook, Jun 17, 11:58 AM CDT, 16 hours 22 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1158 AM CDT SUN JUN 17 2007
OKZ004>048-050>052-TXZ083>090-181200-
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-
1158 AM CDT SUN JUN 17 2007
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...TODAY AND TONIGHT...
THUNDERSTORM OUTLOOK...
NO SEVERE THUNDERSTORMS ARE EXPECTED THROUGH TONIGHT.
DISCUSSION...
AN UPPER-LEVEL LOW OVER WESTERN NORTH TEXAS WILL LIFT SLOWLY NORTH
AND EAST INTO OKLAHOMA TODAY AND TONIGHT. SCATTERED TO NUMEROUS
SHOWERS AND THUNDERSTORMS WILL DEVELOP AHEAD OF THE LOW...
ESPECIALLY ACROSS SOUTHERN AND EASTERN OKLAHOMA AND PARTS OF WESTERN
NORTH TEXAS. LIMITED INSTABILITY AND DEEP LAYER SHEAR WILL KEEP
THUNDERSTORMS BELOW SEVERE LEVELS. HOWEVER...THE STRONGER
THUNDERSTORMS WILL PRODUCE VERY HEAVY RAINFALL AMOUNTS IN A SHORT
PERIOD OF TIME.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY JUN 18.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA... 100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR... 20 PERCENT.
OTHER HAZARDOUS WEATHER...
LOCALLY HEAVY RAINFALL MAY RESULT IN MINOR FLOODING OF POOR
DRAINAGE AREAS.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...
THUNDERSTORM OUTLOOK...
A COLD FRONT WILL APPROACH NORTHERN OKLAHOMA LATE MONDAY INTO
TUESDAY. INCREASING INSTABILITY ALONG AND AHEAD OF THE FRONT...
ALONG WITH INCREASING DEEP LAYER SHEAR... MAY RESULT IN A FEW SEVERE
THUNDERSTORMS LATE MONDAY AND MONDAY NIGHT. THUNDERSTORM
CHANCES WILL CONTINUE INTO MIDWEEK AS THE FRONT STALLS AND WEAKENS
OVER THE AREA.
OTHER HAZARDOUS WEATHER...
NONE.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
MONDAY JUNE 18.In the hours before
Special weather statement, Jun 18, 2:03 AM CDT, 2 hours 17 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 203 AM CDT MON JUN 18 2007 OKZ050>052-180730- LOVE OK-BRYAN OK-MARSHALL OK- 203 AM CDT MON JUN 18 2007 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BRYAN...LOVE AND MARSHALL COUNTIES. AT 2 AM...RADAR INDICATED A CLUSTER OF THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL OVER NORTH CENTRAL TEXAS. THIS AREA OF RAIN IS MOVING NORTH AND WILL AFFECT SOUTHERN PARTS OF OKLAHOMA OVER THE NEXT 1 TO 2 HOURS...MAINLY ALONG AND EAST OF INTERSTATE 35. RAINFALL RATES OF 1 TO 2 INCHES AN HOUR WILL BE POSSIBLE WITH THE STRONGER STORMS WHICH MAY RESULT IN MINOR FLOODING. FLASH FLOODING HAS BEEN REPORTED WITH THESE STORMS IN THE DALLAS FORT WORTH METRO AREA. PEOPLE IN BRYAN...LOVE AND MARSHALL COUNTIES...INCLUDING THE CITY OF DURANT...SHOULD MONITOR THE WEATHER SITUATION CLOSELY.
Special weather statement, Jun 18, 3:35 AM CDT, 45 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 335 AM CDT MON JUN 18 2007 OKZ050>052-180900- LOVE OK-BRYAN OK-MARSHALL OK- 335 AM CDT MON JUN 18 2007 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BRYAN...LOVE AND MARSHALL COUNTIES. A CLUSTER OF STRONG THUNDERSTORMS WAS LOCATED FROM NEAR THACKERVILLE TO 9 MILES SOUTHWEST OF CARTWRIGHT AT 335 AM CDT...MOVING NORTHEAST AT 15 MPH. TORRENTIAL RAINFALL...FREQUENT LIGHTNING AND WIND GUSTS TO 45 MPH CAN BE EXPECTED WITH THE STRONGER THUNDERSTORMS. FLASH FLOODING HAS OCCURRED WITH THESE STORMS ACROSS NORTH TEXAS THIS MORNING AND FLOODING MAY DEVELOP ACROSS FAR SOUTHERN OKLAHOMA IF THUNDERSTORM INTENSITY REMAINS THE SAME. SOME OF THE STORMS ACROSS NORTH TEXAS HAVE PRODUCE RAINFALL RATES OVER 3 INCHES AN HOUR.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 5:34 AM CDT | Severe Thunderstorm Warning | OUN | Bryan | 41 min |
Nearby
Flash Flood Watches in Oklahoma, 2007Every flash flood watch in 2007
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.