Alert archive / Oregon / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 21, NWS Medford, OR

August 17, 2010Douglas County, Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Aug 17, 2010, 4:52 PM PDT for Douglas County, Klamath County, Oregon. It was in force for 23 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
Aug 17, 2010, 4:52 PM PDT (23:52 UTC)
Expired
Aug 17, 2010, 5:15 PM PDT
In force
23 min
Issued by
NWS Medford, OR
Area
Storm-based polygon

Counties Douglas County, OR, Klamath County, OR

The radar

The Medford radar (KMAX), 133 km from the middle of the area, began a volume at 23:55 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 12:00Z, 11.9 hours before the alert went out and 105 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 12:00Z on 2010-08-17Temperature 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 12:00Z on 2010-08-17The 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
2219 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
108 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.

218 
WUUS56 KMFR 172352
SVRMFR
ORC019-035-180015-
/O.NEW.KMFR.SV.W.0021.100817T2352Z-100818T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
452 PM PDT TUE AUG 17 2010

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME WEST CENTRAL KLAMATH COUNTY IN SOUTH CENTRAL OREGON...
  EAST CENTRAL DOUGLAS COUNTY IN SOUTHWEST OREGON...

* UNTIL 515 PM PDT

* AT 450 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED OVER EAST CENTRAL DOUGLAS COUNTY...OR 18 MILES
  NORTHWEST OF CRATER LAKE...AND MOVING NORTH AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL UP TO 1 1/4 INCHES IN DIAMETER HAS BEEN REPORTED
IN CENTRAL POINT WITH THIS STORM. IF YOU ARE IN THE PATH OF
THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4339 12240 4335 12210 4302 12220 4305 12245
TIME...MOT...LOC 2352Z 189DEG 16KT 4313 12230

$$

SVEN
1 follow-up statement
761 
WWUS56 KMFR 180012
SVSMFR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
512 PM PDT TUE AUG 17 2010

ORC019-035-180022-
/O.EXP.KMFR.SV.W.0021.000000T0000Z-100818T0015Z/
KLAMATH OR-DOUGLAS OR-
512 PM PDT TUE AUG 17 2010

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DOUGLAS AND
EXTREME WEST CENTRAL KLAMATH COUNTIES WILL EXPIRE AT 515 PM PDT...

THE STORM THAT PROMPTED THE WARNING IS WEAKENING. SMALL HAIL AND 
HEAVY RAIN IS STILL EXPECTED WITH THIS STORM.

LAT...LON 4339 12240 4335 12210 4302 12220 4305 12245
TIME...MOT...LOC 0012Z 189DEG 16KT 4322 12228

$$

SVEN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 2:37 PM PDTSpecial Marine WarningMFR53 min
Aug 17, 3:52 PM PDTSevere Thunderstorm WarningMFRJackson53 min
Aug 17, 4:33 PM PDTSevere Thunderstorm WarningMFRJackson27 min
Aug 17, 4:43 PM PDTSevere Thunderstorm WarningMFRDouglas, Jackson32 min
Aug 17, 4:58 PM PDTSevere Thunderstorm WarningMFRJackson42 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2010Every severe thunderstorm warning in 2010

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.