Alert archive / Oregon / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Medford, OR

April 23, 2012Douglas County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Apr 23, 2012, 4:12 PM PDT for Douglas County, Oregon. It was in force for 48 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: Apr 23, 2012, 4:12 PM PDT (23:12 UTC)
Expired: Apr 23, 2012, 5:00 PM PDT
In force: 48 min
Issued by: NWS Medford, OR
Area: Storm-based polygon

County Douglas County, OR

The radar

The Medford radar (KMAX), 121 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 88 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: 1383 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

244 
WUUS56 KMFR 232312
SVRMFR
ORC019-240000-
/O.NEW.KMFR.SV.W.0007.120423T2312Z-120424T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
412 PM PDT MON APR 23 2012

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL DOUGLAS COUNTY IN SOUTHWEST OREGON...

* UNTIL 500 PM PDT

* AT 412 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 14
  MILES SOUTH OF CAVITT CREEK FALLS RECREATION SITE...OR 21 MILES
  SOUTHEAST OF ROSEBURG...AND MOVING NORTH AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WOLF
  CREEK FALLS AND GLIDE

LAT...LON 4331 12316 4328 12285 4288 12296 4291 12321
TIME...MOT...LOC 2312Z 188DEG 24KT 4300 12307

$$

SVEN

1 follow-up statement

916 
WWUS56 KMFR 240000
SVSMFR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
500 PM PDT MON APR 23 2012

ORC019-240009-
/O.EXP.KMFR.SV.W.0007.000000T0000Z-120424T0000Z/
DOUGLAS OR-
500 PM PDT MON APR 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL DOUGLAS COUNTY WILL
EXPIRE AT 500 PM PDT...

THE STORM THAT PROMPTED THE WARNING HAS WEAKENED...WITH GUSTY WINDS 
LESS THAT 50 MPH AND PEA SIZED HAIL STILL POSSIBLE.

LAT...LON 4331 12316 4328 12285 4288 12296 4291 12321
TIME...MOT...LOC 2359Z 188DEG 24KT 4331 12301

$$

SVEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 2:20 PM PDT	Severe Thunderstorm Warning	MFR	Lake	40 min
Apr 23, 4:31 PM PDT	Severe Thunderstorm Warning	MFR	Douglas, Jackson, Josephine	29 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2012 Every severe thunderstorm warning in 2012

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.