Alert archive / Oklahoma / Flash Flood Warnings in 1990
Flash Flood Warning 44, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at May 19, 1990, 10:03 PM CDT for Oklahoma County, Oklahoma. It was in force for 117 min.
The area
The counties it named.
The facts
- Issued
- May 19, 1990, 10:03 PM CDT (03:03 UTC)
- Expired
- May 20, 1990, 12:00 AM CDT
- In force
- 117 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties
County Oklahoma County, OK
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 3.1 hours before the alert went out and 37 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
- 3426 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1439 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 5.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOKC 200305 FFWOKC OKC109-200500- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 1003 PM CDT SAT MAY 19 1990 THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL MIDNIGHT CDT FOR THE FOLLOWING OKLAHOMA LOCATIONS... IN CENTRAL OKLAHOMA ...OKLAHOMA COUNTY SEVERE THUNDERSTORMS CONTINUE ACROSS OKLAHOMA COUNTY AND ARE MOVING SLOWLY EASTWARD. EXTREMELY HEAVY RAINS WITH AMOUNTS IN EXCESS OF 3 INCHES ARE ASSOCIATED WITH THESE STORMS. FLASH FLOODING IS LIKELY IN THE OKLAHOMA CITY METRO AREA AS THESE STORMS MOVE VERY SLOWLY EASTWARD. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
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.
In the hours before
Local storm report, May 19, 5:13 PM CDT, 4 hours 50 minutes before
LOCAL STORM REPORT...DELAYED
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
510 PM CDT SAT MAY 19 1990
TIME(CDT) COUNTY EVENT
840 PM (18TH) HARPER DIME SIZED HAIL 13 MILES SOUTH OF REYDON
900 PM (18TH) ROGER MILLS QUARTER TO GOLFBALL SIZED HAIL 6 MILES
SOUTH OF REYDON
1245AM (19TH) PONTOTOC DIME SIZED HAIL 3 MILES EAST OF ROFFSpecial weather statement, May 19, 5:32 PM CDT, 4 hours 31 minutes before
TXZ020-192300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 530 PM CDT SAT MAY 19 1990 ...UNSTABLE WEATHER CONDITIONS PREVAIL IN THE RED RIVER VALLEY... LATE AFTERNOON TEMPERATURES WERE SOARING INTO THE MID TO UPPER 90S ACROSS THE REGION. A SURFACE LOW PRESSURE AREA WAS LOCARED BETWEEN WICHITA FALLS AND CHILDRESS. ALSO...A DRY LINE/DEW POINT LINE WAS LOCATED BETWEEN WICHITA FALLS AND CHILDRESS. POTENTUALLY SEVERE THUNDERSTORMS WERE FORMING EAST OF DALLAS WHILE SEVERE THUNDERSTORMS HAVE BEEN IN PROGRESS FOR SEVERAL HOURS IN NORTHEAST OKLAHOMA. A TORNADO WATCH AREA IS IN EFFECT FOR MUCH OF SOUTH CENTRAL... CENTRAL AND EASTERN OKLAHOMMA UNTIL 11PM CDT TONIGHT.v AREA RESIDENTS SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS IN THIS SECTION OF NORTH CENTRAL TEXAS THIS EVENING.
Local storm report, May 19, 5:37 PM CDT, 4 hours 26 minutes before
LOCAL STORM REPORT...DELAYED CORRECTION TO 1ST LISTING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
510 PM CDT SAT MAY 19 1990
TIME(CDT) COUNTY EVENT
840 PM (18TH) ROGER MILLS DIME SIZED HAIL 13 MILES SOUTH OF REYDON
900 PM (18TH) ROGER MILLS QUARTER TO GOLFBALL SIZED HAIL 6 MILES
SOUTH OF REYDON
1245AM (19TH) PONTOTOC DIME SIZED HAIL 3 MILES EAST OF ROFFSpecial weather statement, May 19, 7:08 PM CDT, 2 hours 55 minutes before
OKZ016-200130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 708 PM CDT SAT MAY 19 1990 ...STRONG THUNDERSTORMS DEVELOPING OVER THE OKLAHOMA CITY METRO AREA... AT 705 PM RADAR INDICATED DEVELOPING THUNDERSTORMS OVER CLEVELAND COUNTY IN THE VICINITY OF NORTH NORMAN AND MOORE. THESE STORMS HAVE DEVELOPED RAPIDLY AND WERE MOVING EAST-NORTHEAST AT 20 MPH. HAIL AND STRONG WINDS ARE LIKELY. BOATERS ON LAKE THUNDERBIRD AND LAKE DRAPER SHOULD REMAIN ALERT TO THE APPROACH OF THESE THUNDERSTORMS. A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR THE METRO AREA. AND THIS HAS SERVED TO LIMIT THE AMOUNT OF CONVERGENCE ALONG THE FRONT AND OUTFLOW BOUNDARY. AS AFTERNOON HEATING CONTINUES AND TEMPERATURES RISE WELL INTO THE 80S THUNDERSTORMS ARE EXPECTED TO DEVELOP IN THE MODERATE RISK AREA AND INTENSIFY RAPIDLY TO SEVERE LEVELS. THE THUNDERSTORMS WILL THEN MOVE NORTHEAST. THE PRIMARY THREAT FROM THUNDERSTORMS THIS AFTERNOON WILL BE LARGE HAIL. THE AMOUNT OF INSTABILITY PRESENT THIS AFTERNOON SUGGESTS THAT SOME THUNDERSTORMS MAY PRODUCE BASEBALL-SIZED HAIL. ISOLATED TORNADOES ARE ALSO POSSIBLE. LAW ENFORCEMENT AND SPOTTER ORGANIZATIONS IN THE MODERATE RISK ASREA SHOULD BE PREPARED FOR ACTIVATION AT ANY TIME THIS AFTERNOON.
Special weather statement, May 19, 7:11 PM CDT, 2 hours 52 minutes before
OKZ016-200130- SPECIAL WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE OKLAHOMA CITY OK 708 PM CDT SAT MAY 19 1990 ...STRONG THUNDERSTORMS DEVELOPING OVER THE OKLAHOMA CITY METRO AREA... AT 705 PM RADAR INDICATED DEVELOPING THUNDERSTORMS OVER CLEVELAND COUNTY IN THE VICINITY OF NORTH NORMAN AND MOORE. THESE STORMS HAVE DEVELOPED RAPIDLY AND WERE MOVING EAST-NORTHEAST AT 20 MPH. HAIL AND STRONG WINDS ARE LIKELY. BOATERS ON LAKE THUNDWERBIRD AND LAKE DRAPER SHOULD REMAIN ALERT TO THE APPROACH OF THESE THUNDERSTORMS. A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR THE METRO AREA.
Special weather statement, May 19, 8:16 PM CDT, 1 hour 47 minutes before
TXZ020-200200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WICHITA FALLS TX 815 PM CDT SAT MAY 19 1990 ...ACTIVE WEATHER REMAINS NORTH OF THE RED RIVER... A STATIONARY FRONTAL BOUNDARY CUT THROUGH OKLAHOMA FROM TULSA TO NEAR OKLAHOMA CITY TO SOUTHWEST OKLAHOMA. THE DRY LINE/DEW POINT LINE THAT WAS JUST WEST OF WICHITA FALLS AROUND 5PM HAD RETREATED TO WEST OF CHILDRESS AT SUNSET. SEVERE THUNDERSTORMS WERE OCCURRING IN THE OKLAHOMA CITY AREA AND EXTENDED NORTHEAST. MOVEMENT APPEARS TO BE SLOWLY TOWARDS THE NORTH. A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF SOUTH CENTRAL... CENTRAL AND EASTERN OKLAHOMA UNTIL MIDNIGHT. LOCALLY... THE THREAT OF THUNDERSTORM DEVELOPMENT THIS NEVENING APPEARS TO BE DIMINISHING. AREA RESIDENTS SHOULD EXPECT THE NEXT GOOD CHANCE FOR THUNDERSTORMS TO BE ON SUNDAY. ANOTHER HOT DAY IS FORECAST WITH THE DRY LINE/DEW POINT LINE FORECAST TO MOVE EAST THROUGH THE REGION ON SUNDAY.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:14 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Payne | 46 min |
| May 19, 7:22 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Oklahoma | 53 min |
| May 19, 7:32 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Pottawatomie | 43 min |
| May 19, 7:35 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 40 min |
| May 19, 7:58 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 47 min |
| May 19, 8:01 PM CDT | Severe Thunderstorm Warning | OUN | Logan | 44 min |
| May 19, 8:11 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Oklahoma, Pottawatomie | 49 min |
| May 19, 8:45 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 45 min |
| May 19, 8:58 PM CDT | Severe Thunderstorm Warning | OUN | Logan, Oklahoma | 47 min |
| May 19, 9:22 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie, Seminole | 23 min |
| May 19, 9:28 PM CDT | Severe Thunderstorm Warning | OUN | Canadian | 32 min |
| May 19, 9:39 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Pottawatomie, Seminole | 66 min |
| May 19, 9:44 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Oklahoma | 46 min |
| May 19, 10:28 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Oklahoma | 62 min |
| May 19, 10:41 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 49 min |
| May 19, 11:30 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Oklahoma | 60 min |
| May 19, 11:52 PM CDT | Flash Flood Warning | OUN | Oklahoma | 3 hr |
| May 20, 12:44 AM CDT | Severe Thunderstorm Warning | OUN | Oklahoma | 61 min |
| May 20, 12:49 AM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 56 min |
| May 20, 1:33 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 42 min |
| May 20, 1:49 AM CDT | Severe Thunderstorm Warning | OUN | Hughes, Seminole | 56 min |
Nearby
Flash Flood Warnings in Oklahoma, 1990Every flash flood warning in 1990
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.