Alert archive / Oklahoma / Flash Flood Warnings in 1999
Flash Flood Warning 21, NWS Norman, OK
NWS Norman, OK issued this flash flood warning at May 22, 1999, 5:17 PM CDT for Kay 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
- May 22, 1999, 5:17 PM CDT (22:17 UTC)
- Expired
- May 22, 1999, 8:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Kay County, OK
The radar
The Vance AFB radar (KVNX), 87 km from the middle of the area, began a volume at 22:17 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, 10.3 hours before the alert went out and 171 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
- 1999 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 912 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOUN 222224 FFWOKC OKC071-230115- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE NORMAN OK 517 PM CDT SAT MAY 22 1999 THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * FLASH FLOOD WARNING FOR... EASTERN KAY COUNTY IN NORTHEAST OKLAHOMA * UNTIL 815 PM CDT * THUNDERSTORMS WITH HEAVY RAINFALL HAVE PRODUCED RAINFALL UP TO 2.5 INCHES IN THE LAST 1 TO 2 HOURS. FLOODING IS BEGINNING TO BE REPORTED ON ROADWAYS IN THE PONCA CITY AREA. * HEAVY RAIN WILL BEGIN TO DECREASE DURING THE NEXT 45 MINUTES TO ONE HOUR...BUT FLOODING WILL CONTINUE TO BE A PROBLEM FOR ABOUT THE NEXT 3 HOURS IN EASTERN KAY COUNTY. * LOCATIONS IN THE WARNING INCLUDE KILDARE...NEWKIRK...BLACKWELL... AND PONCA CITY 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 3661 9733 3661 9707 3698 9681 3693 9719 $$ PURPURA
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 5:21 AM CDT | Severe Thunderstorm Warning | OUN | Harper | 39 min |
| May 22, 12:40 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 35 min |
| May 22, 1:15 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 30 min |
| May 22, 3:34 PM CDT | Severe Thunderstorm Warning | OUN | Noble | 41 min |
| May 22, 4:15 PM CDT | Severe Thunderstorm Warning | OUN | Noble | 45 min |
| May 22, 4:33 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 42 min |
| May 22, 4:57 PM CDT | Severe Thunderstorm Warning | OUN | Noble | 48 min |
| May 22, 5:49 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 26 min |
| May 22, 6:14 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 61 min |
| May 22, 6:51 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 39 min |
Nearby
Flash Flood Warnings in Oklahoma, 1999Every 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.