Alert archive / Oregon / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 2, NWS Medford, OR

May 28, 1999Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at May 28, 1999, 5:20 PM PDT for Klamath County, Oregon. It was in force for 50 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
May 28, 1999, 5:20 PM PDT (00:20 UTC)
Expired
May 28, 1999, 6:10 PM PDT
In force
50 min
Issued by
NWS Medford, OR
Area
Whole counties

County Klamath County, OR

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 00:00Z, 0.3 hours before the alert went out and 101 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.

Skew-T log-pSkew-T log-p diagram, Medford/Jackson, OR at 00:00Z on 1999-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 00:00Z on 1999-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -26 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2613 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
-26 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

999 
WUUS1 KMFR 290025 RRA
SVRMFR
ORC035-290110-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
520 PM PDT FRI MAY 28 1999

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN AND EASTERN KLAMATH COUNTY IN SOUTH CENTRAL OREGON

* UNTIL 610 PM PDT

* AT 518 PM PDT... MEDFORD DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 44 MILES EAST OF KLAMATH FALLS OR 4 MILES EAST
  OF BLY... THE STORM IS MOVING NORTHEAST AT 15 MPH.

THIS STORM IS EXPECTED TO REMAIN OVER RURAL AREAS

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

BUNNAG

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at May 28, 2:30 PM PDT, 2 hours 50 minutes earlier.

Area forecast discussion, May 28, 2:30 PM PDT, 2 hours 50 minutes before
SOUTHWEST OREGON/NORTHERN CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
230 PM PDT FRI MAY 28 1999

12Z NGM/ETA/AVN IN.

A RELATIVELY WEAK UPPER TROUGH OFFSHORE IS PROGGED TO MOVE ONSHORE
THIS EVENING.  TIMING WILL MINIMIZE SHOWER ACTIVITY SINCE IT COMES IN
TOO LATE TO TAKE ADVANTAGE OF MAXIMUM SURFACE HEATING...BUT IT STILL
MAY KICK OFF SOME EVENING SHOWERS OVER THE MOUNTAINS AND EAST SIDE.

THE TROUGH WILL HANG UP TONIGHT AS IT DIGS IN OVER THE FORECAST
AREA...BUT IT LOOKS LIKE IT WILL SPAWN A CUTOFF LOW TO THE SOUTH AND
THEN SHEAR TO THE EAST OF THE FORECAST AREA BY TOMORROW AFTERNOON.
SO...THE FORECAST AREA WILL BE ON THE NVA SIDE OF THE TROUGH BY MAX
SURFACE HEATING SATURDAY.  THE TROUGH DOES NOT MAKE MUCH EASTWARD
PROGRESS SO A STRONG TRAILING RIDGE WILL REMAIN OFFSHORE...THOUGH IT
MAKES IT PRESENCE FELT WITH INCREASING NORTH WINDS ALOFT ALONG THE
WEST COAST.  THE UPPER LEVEL TRAJECTORIES WOULD SUPPORT A DRY
FORECAST ONCE THE TROUGH MOVES TO THE EAST...ANY SHORT WAVES MOVING
DOWN THE BACKSIDE OF THE TROUGH WOULD BE DRY INSIDE SLIDERS.
MODEL TIME SECTIONS ALL SCREAM DRY AND STABLE AFTER TONIGHT.
HOWEVER...WILL PUT SOME CLOUDS IN THE FORECAST FOR SISKIYOU/MODOC
COUNTIES SATURDAY AFTERNOON/EVENING TO ACCOUNT FOR UNCERTAINTY AS TO
WHERE THE THUNDERSTORMS IN CALIFORNIA WILL DEVELOP ON SATURDAY.

MEANWHILE AT LOW LEVELS...AN OFFSHORE EVENT IS IN THE OFFING
BEGINNING SATURDAY NIGHT AND STRENGTHENING SUNDAY NIGHT.  NOTHING
REALLY DRAMATIC...BUT BROOKINGS WILL GET FAIRLY WARM SUNDAY.  LOOK
FOR AREAS OF MARINE STRATUS TO BE AROUND SATURDAY MORNING...AND
ISOLATED NORTH OF CAPE BLANCO SUNDAY MORNING.

SO...A DRY FORECAST FOR THE WEEKEND ONCE THE TROUGH MOVES THROUGH...
WHICH SHOULD OCCUR BY NOON SATURDAY.  THE ONE EXCEPTION TO THIS WILL
BE THE AFOREMENTIONED MARINE STRATUS.

STOCKTON.

.MFR...GALE WARNING...COASTAL WATERS FLORENCE TO PT ST GEORGE.

MFR UU 047/082 045/086 047 150000
LMT BU 045/079 040/083 042 152000
RBG UU 048/078 046/082 048 150000
4BK BU 049/066 052/080 058 150000
OTH BU 047/061 046/064 051 150000
YKA BU 044/083 041/086 043 150000
MHS BU 048/080 045/083 047 150000
AAT BU 042/081 038/085 040 152000

Nearby

Severe Thunderstorm Warnings in Oregon, 1999Every severe thunderstorm 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.