Alert archive / Oregon / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 33, NWS Medford, OR

September 5, 2013Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Sep 5, 2013, 1:02 PM PDT for Klamath County, Oregon. It was in force for 58 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: Sep 5, 2013, 1:02 PM PDT (20:02 UTC)
Expired: Sep 5, 2013, 2:00 PM PDT
In force: 58 min
Issued by: NWS Medford, OR
Area: Storm-based polygon

County Klamath County, OR

The radar

The Medford radar (KMAX), 127 km from the middle of the area, began a volume at 20:03 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 8.0 hours before the alert went out and 111 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 133 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.

012 
WUUS56 KMFR 052002
SVRMFR
ORC035-052100-
/O.NEW.KMFR.SV.W.0033.130905T2002Z-130905T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
102 PM PDT THU SEP 5 2013

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

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

* UNTIL 200 PM PDT

* AT 100 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES
  SOUTHWEST OF KLAMATH MARSH...OR 21 MILES EAST OF CRATER LAKE...AND
  MOVING NORTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  JACKSON CREEK FOREST CAMP AND PORTIONS OF HIGHWAY 97.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT
THURSDAY EVENING FOR SOUTH CENTRAL OREGON.

&&

LAT...LON 4311 12177 4303 12139 4272 12167 4276 12189
TIME...MOT...LOC 2002Z 206DEG 12KT 4279 12173

$$

BTL

2 follow-up statements

839 
WWUS56 KMFR 052034
SVSMFR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
134 PM PDT THU SEP 5 2013

ORC035-052100-
/O.CON.KMFR.SV.W.0033.000000T0000Z-130905T2100Z/
KLAMATH OR-
134 PM PDT THU SEP 5 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM PDT
FOR CENTRAL KLAMATH COUNTY...

AT 129 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR KLAMATH MARSH...OR 23 MILES EAST OF CRATER LAKE...MOVING
NORTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JACKSON
CREEK FOREST CAMP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT
THURSDAY EVENING FOR SOUTH CENTRAL OREGON.

&&

LAT...LON 4311 12177 4303 12139 4272 12167 4276 12189
TIME...MOT...LOC 2033Z 206DEG 12KT 4288 12167

$$

SK

910 
WWUS56 KMFR 052044
SVSMFR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
144 PM PDT THU SEP 5 2013

ORC035-052054-
/O.CAN.KMFR.SV.W.0033.000000T0000Z-130905T2100Z/
KLAMATH OR-
144 PM PDT THU SEP 5 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL KLAMATH COUNTY IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT
THURSDAY EVENING FOR SOUTH CENTRAL OREGON.

LAT...LON 4311 12177 4303 12139 4272 12167 4276 12189
TIME...MOT...LOC 2044Z 206DEG 12KT 4291 12165

$$

SK

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 Sep 5, 1:00 PM PDT, 2 minutes earlier.

Area forecast discussion, Sep 5, 1:00 PM PDT, 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
100 PM PDT THU SEP 5 2013

.DISCUSSION...05/12Z NAM/GFS IN.

A CUTOFF LOW JUST OFF THE SOUTHERN OREGON COAST IS NOW LIFTING BACK
INTO THE WESTERLIES...BUT IT WILL DO SO IN FITS AND STARTS. IT
WILL MOVE ONSHORE THIS AFTERNOON...MOVE NORTHEAST INTO EASTERN
WASHINGTON STATE FRIDAY MORNING...REMAIN THERE THROUGH SATURDAY...
THEN FINALLY MOVE OUT TO THE EAST SATURDAY NIGHT INTO SUNDAY.

SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING AS
THE LOW APPROACHES AND TRAVERSES THE CWA...THEN SOME SHOWERS WILL
PERSIST TONIGHT OVER THE NORTHWEST PORTIONS OF THE CWA DUE TO
MOISTURE WRAPPING AROUND THE LOW. PRECIPITATION WILL END FRIDAY.
WINDS WILL BE GUSTY OVER THE RIDGES AND THE EAST SIDE THROUGH THIS
EVENING. SOME OF THE THUNDERSTORMS MAY BE SEVERE THIS AFTERNOON
OVER NORTHERN LAKE COUNTY...SO A SEVERE THUNDERSTORM WATCH IS IN
EFFECT THERE INTO THIS EVENING.

ONCE THE LOW MOVES OUT...A STRONG UPPER RIDGE WILL BUILD OVER THE
PACIFIC NORTHWEST SUNDAY...AND THIS WILL EVENTUALLY MORPH INTO A
WEAK REX BLOCK TUESDAY INTO WEDNESDAY WITH THE HIGH PORTION OF THE
BLOCK RIGHT OVER OREGON. OFFSHORE LOW LEVEL FLOW WILL DEVELOP
SATURDAY NIGHT AND CONTINUE THROUGH THE FIRST HALF OF NEXT WEEK.
EXPECT DRY WEATHER WITH A WARMING TREND BEGINNING SUNDAY. THE
WARMING WILL PEAK AROUND THE MIDDLE OF NEXT WEEK WITH INLAND HIGH
TEMPERATURES 5-10 DEGREES ABOVE NORMAL.

THE BLOCK WILL BE A BRIEF ONE...BREAKING DOWN WEDNESDAY NIGHT. THE
LOW PORTION OF THE BLOCK WILL THEN MIGRATE NORTH TO NORTHERN
CALIFORNIA THURSDAY. THIS LOW WILL BE WEAK...BUT IT WILL HELP
INDUCE SOME SOUTHERLY FLOW ALOFT AND THIS WILL BRING BACK THE
POSSIBILITY OF THUNDERSTORMS TO THE AREA...BUT IT LOOKS LIKE THE
EARLIEST THAT WILL HAPPEN IS THURSDAY AFTERNOON.

&&

.AVIATION...BASED ON THE 05/18Z TAF CYCLE.

AREAS OF MVFR CIGS ALONG THE COAST AND IN THE UMPQUA BASIN WILL
PERSIST THROUGH FRIDAY MORNING...THEN CLEAR TO VFR FRIDAY
AFTERNOON. AREAS OF HIGHER TERRAIN WILL BE OBSCURED THE REMAINDER OF
THE AREA WILL REMAIN VFR WITH SOME TERRAIN OBSCURATION...BUT
THERE WILL BE THUNDERSTORMS IN THE AREA THROUGH THIS EVENING. SOME
OF THESE THUNDERSTORMS MAY BE STRONG OR EVEN SEVERE WITH STRONG WINDS
AND TURBULENCE.

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING UNTIL 11 PM PDT THIS EVENING FOR ORZ027-030.
     RED FLAG WARNING UNTIL 11 PM PDT THIS EVENING FOR FOR ORZ031.
     SEVERE THUNDERSTORM WATCH UNTIL 8 PM PDT THIS EVENING FOR
        ORZ031.

CA...NONE.

PACIFIC COASTAL WATERS...NONE.

15/15/17

In the hours before

Local storm report, Sep 5, 10:10 AM PDT, 2 hours 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1010 AM PDT THU SEP 5 2013

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1008 AM     HEAVY RAIN       6 NNE NORTH BEND        43.49N 124.19W
09/05/2013  M1.04 INCH       COOS               OR   TRAINED SPOTTER

            FROM 830AM TO 10AM. LOTS OF THUNDER AND
            LIGHTNING. NO SIGNIFICANT WIND.

&&

IRIS SYSTEM

Local storm report, Sep 5, 11:56 AM PDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1156 AM PDT THU SEP 5 2013

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1130 AM     HEAVY RAIN       4 WSW REEDSPORT         43.68N 124.19W
09/05/2013  M1.35 INCH       PZZ350             PZ   TRAINED SPOTTER

            PEAK WIND OF 24 MPH. HEAVY RAIN DURATION 1
            HOUR OBSERVER LOCATION REEDSPORT

&&

IRIS SYSTEM

Local storm report, Sep 5, 12:16 PM PDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1216 PM PDT THU SEP 5 2013

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1215 PM     HEAVY RAIN       1 NNW LAKESIDE          43.59N 124.18W
09/05/2013  M1.41 INCH       COOS               OR   TRAINED SPOTTER

            THUNDERSTORMS THIS MORNING ENDING AT NOON.

&&

IRIS SYSTEM

Special weather statement, Sep 5, 12:56 PM PDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
1256 PM PDT THU SEP 5 2013

ORZ029-030-052045-
KLAMATH BASIN OR-NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE
COUNTY OR-
1256 PM PDT THU SEP 5 2013

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL KLAMATH COUNTY UNTIL 145
PM PDT...

AT 1255 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 11 MILES NORTHEAST OF COLLIER MEMORIAL STATE
PARK...OR 23 MILES SOUTHEAST OF CRATER LAKE...MOVING NORTH AT 15 MPH.

HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
LIGHTNING.

AREAS AFFECTED BY THIS STORM INCLUDE...KLAMATH MARSH AND JACKSON
CREEK FOREST CAMP....AND PORTIONS OF HIGHWAY 97.

THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN
EFFECT FOR THIS AREA. BE CERTAIN TO MONITOR LOCAL RADIO AND TV
STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4304 12185 4301 12143 4271 12165 4274 12186
TIME...MOT...LOC 1956Z 199DEG 15KT 4275 12172

BTL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 12:56 PM PDT	Special Weather Statement	MFR	Klamath	49 min
Sep 5, 1:28 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	32 min
Sep 5, 1:57 PM PDT	Special Weather Statement	MFR	Josephine	48 min
Sep 5, 2:42 PM PDT	Special Weather Statement	MFR	Klamath	48 min
Sep 5, 2:50 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	25 min
Sep 5, 3:38 PM PDT	Special Weather Statement	MFR	Jackson	37 min
Sep 5, 3:42 PM PDT	Areal Flood Advisory	MFR	Jackson	3 hr

Nearby

Severe Thunderstorm Warnings in Oregon, 2013 Every severe thunderstorm warning in 2013

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.