Alert archive / Oklahoma / Flash Flood Warnings in 2001
Flash Flood Warning 8, NWS Amarillo, TX
NWS Amarillo, TX issued this flash flood warning at Sep 20, 2001, 8:20 PM CDT for Beaver 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
- Sep 20, 2001, 8:20 PM CDT (01:20 UTC)
- Expired
- Sep 20, 2001, 11:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS Amarillo, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Beaver County, OK
The radar
The Dodge City radar (KDDC), 109 km from the middle of the area, began a volume at 01:24 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
Dodge City, (KDDC), launched 00:00Z, 1.3 hours before the alert went out and 112 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
- 488 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 2154 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS54 KAMA 210120 FFWAMA FFWAMA OKC007-210415- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE AMARILLO TX 820 PM CDT THU SEP 20 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * FLASH FLOOD WARNING FOR... BEAVER COUNTY IN THE OKLAHOMA PANHANDLE * UNTIL 1115 PM CDT * AT 820 PM CDT...WEATHER SERVICE RADAR ESTIMATED 1 1/2 TO 2 INCHES OF RAIN HAD FALLEN ACROSS EASTERN BEAVER COUNTY. DOPPLER RADAR INDICATED VERY HEAVY RAINFALL WILL CONTINUE TO MOVE ACROSS EASTERN BEAVER COUNTY. THESE STORMS WILL MOVE SLOWLY SOUTHWEST AT 5 MPH PRODUCING UP TO 2 INCHES OF RAIN OVER THE NEXT COUPLE OF HOURS. * SOME LOCATIONS AFFECTED INCLUDE... BEAVER...ELMWOOD...FORGAN...GATE...KNOWLES...MOCANE AND SLAPOUT PEOPLE LIVING IN LOW LYING AREAS SHOULD SEEK HIGHER GROUND IF FLOODING IS OBSERVED. LAT...LON 3699 10000 3700 10054 3651 10055 3651 10002
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 Amarillo, TX wrote its last area forecast discussion before this flash flood warning went out at Sep 20, 2:37 PM CDT, 5 hours 43 minutes earlier.
Area forecast discussion, Sep 20, 2:37 PM CDT, 5 hours 43 minutes before
TEXAS/OKLAHOMA PANHANDLES FORECAST DISCUSSION NATIONAL WEATHER SERVICE AMARILLO TX 237 PM CDT THU SEP 20 2001 THE MAIN FORECAST DIFFICULTY WILL BE PRECIPITATION AND TEMPERATURES. SURFACE ANALYSIS SHOWED A WEAK DRYLINE IN PLACE ACROSS THE PANHANDLES FROM THE NORTHCENTRAL ZONE EXTENDING SOUTHWEST. A LOW PRESSURE TROUGH WAS DRAPED ACROSS THE REGION WITH A SHORTWAVE EMBEDDED IN NORTHWEST FLOW OVER NORTHEASTERN NEW MEXICO. AS THIS SHORTWAVE PUSHES SOUTHEAST THIS AFTERNOON THUNDERSTORMS WILL INITIATE ALONG THE DRYLINE. WITH A VERY UNSTABLE AIR MASS ACROSS THE CENTRAL AND EASTERN ZONES...SEVERE THUNDERSTORMS WILL BE POSSIBLE TONIGHT ESPECIALLY AS THE LOW-LEVEL JET DEVELOPS TO THE SOUTHEAST THIS EVENING. A COLD FRONT PUSHING SOUTH ACROSS WESTERN KANSAS AND EASTERN COLORADO WILL PUSH THROUGH THE FORECAST AREA TONIGHT BUT MAY HANG UP OVER THE SOUTHERN ZONES FRIDAY. THIS WILL COOL TEMPERATURES DOWN ABOUT 10 DEGREES COMPARED TO TODAYS TEMPERATURES. PLENTY OF LOW-LEVEL MOISTURE WILL STILL BE IN PLACE... HOWEVER ANTICYCLONIC FLOW ALOFT WITH SUBSIDENCE BEHIND AN EXITING SHORTWAVE COULD LIMIT CONVECTION IN THE EASTERN AND CENTRAL ZONES FRIDAY AFTERNOON AND EVENING. HOWEVER...ADDITIONAL VORT MAX ENERGY SHOULD DEVELOP OVER THE MOUNTAINS AND PUSH INTO THE WESTERN HIGH PLAINS FRIDAY NIGHT. THIS WILL HELP SUSTAIN MOUNTAIN STORMS OVERNIGHT BRINGING A CHANCE OF PRECIPITATION TO THE WESTERN ZONES AND POSSIBLY INTO THE CENTRAL ZONES FRIDAY NIGHT. NORTHWEST FLOW CONTINUES SATURDAY WITH ADDITIONAL SHORTWAVE ACTIVITY POSSIBLE. WITH RETURN FLOW AND A LEE TROUGH SETTING UP...ADDITIONAL STORMS MAY DEVELOP ACROSS THE FORECAST AREA. FOR THE LATER PERIODS...MEDIUM RANGE MODELS CONTINUE THE NORTHWEST FLOW SUNDAY USHERING DOWN A COLD FRONT ACROSS THE AREA. IF THIS HAPPENS...COLD AIR ADVECTION WOULD INCREASE. IN ADDITION...THE MODELS AMPLIFY A RIDGE IN THE SOUTHWESTERN STATES MONDAY. WITH NORTHERLY WINDS ALOFT RESULTING...MOUNTAIN CONVECTION WOULD HUG THE MOUNTAINS MONDAY AND TUESDAY...REDUCING THE LIKELIHOOD OF PRECIPITATION IN THE PANHANDLES. SURFACE HIGH PRESSURE BEHIND THE FRONT WOULD LOWER TEMPERATURES TEMPERATURES DURING THE EARLY PART OF THE WEEK WITH A GRADUAL WARM UP POSSIBLE BY MID WEEK. PRELIM CCF... AMA 59/83 60/86 58 322 DHT 56/81 57/84 55 123 .AMA... TX...NONE. OK...NONE. CB
The office that day
Everything else NWS Amarillo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 8:03 PM CDT | Severe Thunderstorm Warning | AMA | Beaver | 87 min |
Nearby
Flash Flood Warnings in Oklahoma, 2001Every 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.