Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 11, NWS Medford, OR

July 27, 1997Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Jul 27, 1997, 6:20 PM PDT for Klamath County, Oregon. It was in force for 60 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, 1997, 6:20 PM PDT (01:20 UTC)
Expired: Jul 27, 1997, 7:20 PM PDT
In force: 60 min
Issued by: NWS Medford, OR
Area: Whole counties

County Klamath County, OR

The radar

The Medford radar (KMAX), 110 km from the middle of the area, began a volume at 01:20 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

Medford/Jackson, OR (KMFR), launched 00:00Z, 1.3 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 759 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2402 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 49 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.

897 
WUUS1 KMFR 280125 RRA
SVRMFR
ORC035-280220-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
620 PM PDT SUN JUL 27 1997

THE NATIONAL WEATHER SERVICE IN MEDFORD OR HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 720 PM PDT FOR PEOPLE IN THE
FOLLOWING LOCATIONS...

IN SOUTH CENTRAL OREGON

  ...NORTH CENTRAL KLAMATH COUNTY

AT 620 PM...RADAR INDICATED A SEVERE THUNDERSTORM IN EXTREME NORTH
CENTRAL KLAMATH COUNTY 15 MILES WEST OF THE CITY CRESCENT. THIS STORM
WILL MOVE NORTH AT 10 MPH AND AFFECT CRESCENT LAKE. 

LARGE HAIL UP TO 1 INCH IN DIAMETER IS LIKELY WITH THIS STORM.

BE ALERT FOR LOCAL FLOODING CAUSED BY THUNDERSTORM RAINS.

FOSTER

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 Jul 27, 2:30 PM PDT, 3 hours 50 minutes earlier.

Area forecast discussion, Jul 27, 2:30 PM PDT, 3 hours 50 minutes before

SOUTHWEST OREGON/NORTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
230 PM PDT SUN JUL 27 1997

CONVCTN BEGINNG TO BUBBLE THIS AFTN. STILL FEEL THAT E OF CASCDS/NRN
CA WL BE FOCUS OF TSRA...WL LEAVE SLT CHC OF A CELL TO DRIFT INTO SE
ROGUE BASIN TNGT. THERML TROF WL DRIFT INTO ERN OR MON. NGM LI VALUES
BOTTOM OUT AT -6 IN S CENT AND SERN OR MON AFTN...WITH BLO 0 VALUES
WELL WEST OF CASCDS. THETA-E RDG ORIENTED FM UT/NRN NV AND INTO CNTL
OREGON TO PROVIDE THE JUICE. CONSENSUS OF MDLS HAVE MID LVL FLOW
STRAIGHT SLY. BY TUE AFTN THE FLOW TURNS MORE SWLY AND WHILE MSTR AND
INSTABILITY STILL AMPLE E OF CASCDS...W SIDE SAME OR EVEN A BIT LESS.
WL NOT MENTN CHC OF TSRA W SIDE TUE. XPCT CSTL ST TO REFORM ALG CST
EACH MRNG...WITH THE MARINE PUSH FINALLY OCCURRG THU MRNG ACCORDG TO
MRF. CRAWFORD

.MFR...NONE

.KMAX...VCP 21...OPERATING.

...SEE PDXCCFPDX FOR CODED CITIES FORECAST

MFR BU 058/093 057/090 057 171120
LMT TB 053/085 051/083 050 172343
RBG UU 057/086 057/082 056 170-10
4BK BB 051/068 052/068 052 170000
OTH BB 053/069 054/069 054 170000
YKA TU 054/095 053/091 052 172343
MHS TU 053/086 052/083 051 172343
S11 TU 048/088 047/086 045 172343

The office that day

Everything else NWS Medford, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 9:25 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	55 min
Jul 28, 4:31 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	59 min
Jul 28, 4:46 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	44 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1997 Every severe thunderstorm warning in 1997

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.