Alert archive / Oregon / Flash Flood Warnings in 2021
Flash Flood Warning 1, NWS Pendleton, OR
NWS Pendleton, OR issued this flash flood warning at Jul 31, 2021, 4:44 PM PDT for Grant County, Oregon. It was in force for 108 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2021, 4:44 PM PDT (23:44 UTC)
- Expired
- Jul 31, 2021, 6:32 PM PDT
- In force
- 108 min
- Issued by
- NWS Pendleton, OR
- Area
- Storm-based polygon
- Flood severity
- None
County Grant County, OR
The radar
The Pendleton radar (KPDT), 108 km from the middle of the area, began a volume at 23:45 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
Boise Airport, ID (KBOI), launched 12:00Z, 11.7 hours before the alert went out and 217 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
- 172 J/kg
- Mixed-layer CIN
- -246 J/kg
- Mixed-layer LCL
- 1811 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
853
WGUS56 KPDT 312344
FFWPDT
ORC023-010145-
/O.NEW.KPDT.FF.W.0001.210731T2344Z-210801T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pendleton OR
444 PM PDT Sat Jul 31 2021
The National Weather Service in Pendleton has issued a
* Flash Flood Warning for...
Eastern Grant County in central Oregon...
* Until 645 PM PDT.
* At 444 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of Eastern Grant County
Anthony Lakes Mountain Resort
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 4485 11830 4484 11832 4483 11831 4482 11831
4481 11830 4480 11830 4478 11829 4477 11828
4477 11829 4475 11829 4475 11830 4474 11832
4474 11835 4476 11836 4478 11836 4479 11835
4480 11835 4482 11835 4483 11836
FLASH FLOOD...RADAR INDICATED
$$
RSC1 follow-up statement
302
WGUS76 KPDT 010132
FFSPDT
Flash Flood Statement
National Weather Service Pendleton OR
632 PM PDT Sat Jul 31 2021
ORC023-010142-
/O.CAN.KPDT.FF.W.0001.000000T0000Z-210801T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grant OR-
632 PM PDT Sat Jul 31 2021
...FLASH FLOOD WARNING IS CANCELLED FOR EASTERN GRANT COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1100 PM PDT Sunday for
portions of Oregon and southeast Washington.
LAT...LON 4485 11830 4484 11832 4483 11831 4482 11831
4481 11830 4480 11830 4478 11829 4477 11828
4477 11829 4475 11829 4475 11830 4474 11832
4474 11835 4476 11836 4478 11836 4479 11835
4480 11835 4482 11835 4483 11836
$$
RSCThe office that day
Everything else NWS Pendleton, OR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:49 PM PDT | Flash Flood Watch | PDT | Crook, Deschutes, Gilliam, Grant, Jefferson, Morrow and 5 more | 30 hr |
Nearby
Flash Flood Warnings in Oregon, 2021Every flash flood warning in 2021
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.