Alert archive / Oregon / Flash Flood Warnings in 1998
Flash Flood Warning 13, NWS Pendleton, OR
NWS Pendleton, OR issued this flash flood warning at Jul 27, 1998, 2:13 PM PDT for Jefferson County, Oregon. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1998, 2:13 PM PDT (21:13 UTC)
- Expired
- Jul 27, 1998, 3:15 PM PDT
- In force
- 62 min
- Issued by
- NWS Pendleton, OR
- Area
- Whole counties
County Jefferson County, OR
The radar
The Portland,OR radar (KRTX), 185 km from the middle of the area, began a volume at 21:16 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
Salem/Mcnary, OR (KSLE), launched 12:00Z, 9.2 hours before the alert went out and 148 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
- 860 J/kg
- Mixed-layer CIN
- -450 J/kg
- Mixed-layer LCL
- 1574 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 42 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 KPDT 272113 FFWPDT ORC031-272215- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PENDLETON OR 213 PM PDT MON JUL 27 1998 THE NATIONAL WEATHER SERVICE IN PENDLETON HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHEASTERN JEFFERSON IN NORTH CENTRAL OREGON * UNTIL 315 PM PDT * AT 200 PM... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN 20 EAST OF MADRAS. * A SLOW MOVING THUNDERSTORM IS PRODUCING HEAVY RAIN IN SOUTHEAST JEFFERSON COUNTY. DOPPLER RADAR ESTIMATES THAT THIS THUNDERSTORM HAS PRODUCED OVER ONE INCH OF RAINFALL IN THE PAST HOUR. A THUNDERSTORM CAN CAUSE FLASH FLOODING MANY MILES FROM WHERE THE STORM IS OCCURING. KEEP CHILDREN AWAY FROM STREAMS AND CREEKS AS WELL AS STORM DRAINS...VIADUCTS AND OTHER LOW LYING AREAS SUBJECT TO FLOODING. SMITH
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 Pendleton, OR wrote its last area forecast discussion before this flash flood warning went out at Jul 27, 1:46 PM PDT, 27 minutes earlier.
Area forecast discussion, Jul 27, 1:46 PM PDT, 27 minutes before
NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION... NATIONAL WEATHER SERVICE PENDLETON OR CORRECTED FOR FIRE 200 AM PDT MON JUL 27 1998 WEATHER INFORMATION THUNDERSTORMS ARE FLARING UP ACROSS THE CWA THIS AFTERNOON IN... MOSTLY IN THE CENTRAL/NORTHEAST OREGON MOUNTAINS AND OTHERS OVER THE CASCADES. DEW POINTS ARE ABOUT 5 DEGREES HIGHER THAN ON SUNDAY WITH PRECIP WATER IN THE .75 TO 1.00 INCH...WHICH IS SIMILAR TO SUNDAY. CAPES ARE HIGHEST ALONG THE CASCADES TODAY/TUE WITH MODIFIED SOUNDINGS SHOWING LIFTED INDICES IN THE NEGATIVE SINGLE DIGITS. LOOKS LIKE THUNDERSTORMS THIS EVENING ARE A GOOD FORECAST AND WILL INCREASE POPS TO CHANCE IN MOUNTAINS...ISOLATED ELSEWHERE. FOR TUESDAY...ATMOSPHERE BECOMES EVEN MORE UNSTABLE AS AN UPPER TROUGH OFF THE NORTHWEST COAST ADVANCES CLOSER TO THE REGION. 850MB TEMPS REMAIN IN THE UPPER 20S TO NEAR 30 DEGREES C...HOWEVER MORE CLOUD COVER MAY KEEP TEMPS DOWN A FEW DEGREES TUE. KPDT WAS 102 AT 1PM...SO TEMPS SHOULD BE AT LEAST CLOSE TO THE CENTURY MARK AGAIN IN THE FOOTHILLS OF THE BLUES AND A FEW DEGREES OVER IN THE COLUMBIA BASIN. UPPER TROUGH WILL THEN MOVE INTO THE CWA BY LATE WEDNESDAY AND WEDNESDAY NIGHT. LOOKS LIKE A ROUND OF POSSIBLE SEVERE WEATHER ON THE HORIZON FOR WEDNESDAY AS DIFFLUENCE ALOFT COMBINED WITH INCREASED CONVECTIVE INSTABILITY MOVES INTO THE CWA. EXTENDED...FINALLY SOME COOLER TEMPERATURES WITH BREEZY CONDITIONS AND A CHANCE OF SHOWERS FOR THE REST OF THE WEEK INTO THE WEEKEND AS THE UPPER TROUGH DEEPENS AND MOVE ACROSS THE PACIFIC NORTHWEST. FIRE WEATHER...A FIRE WEATHER WATCH HAS BEEN ISSUED FOR THE FIRE WEATHER DISTRICT FOR POSSIBLE DRY LIGHTNING THIS AFTERNOON/EVENING AND AGAIN ON TUESDAY. MOST STORMS WILL BE WET...HOWEVER WITH THE ATMOSPHERE BEING SO HOT WITH HUMIDITIES IN THE TEENS AND 20S A FEW DRY STRIKES ARE NOT RULED OUT. RSC. PDT 2223 ALW 2223 PSC 1222 YKM 1222 .KPDT-88D...VCP31/CSR21. .KPDT...NONE.
Nearby
Flash Flood Warnings in Oregon, 1998Every flash flood warning in 1998
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.