Alert archive / Oregon / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Medford, OR

February 28, 20124 counties in Oregon

NWS Medford, OR issued this severe thunderstorm warning at Feb 28, 2012, 5:30 PM PST for 4 counties in Oregon. It was in force for 45 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: Feb 28, 2012, 5:30 PM PST (01:30 UTC)
Expired: Feb 28, 2012, 6:15 PM PST
In force: 45 min
Issued by: NWS Medford, OR
Area: Storm-based polygon

Counties Coos County, OR, Curry County, OR, Douglas County, OR, Josephine County, OR

The radar

The Medford radar (KMAX), 140 km from the middle of the area, began a volume at 01:30 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, 1.5 hours before the alert went out and 128 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: 1627 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 697 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.

265 
WUUS56 KMFR 290130
SVRMFR
ORC011-015-019-033-290215-
/O.NEW.KMFR.SV.W.0002.120229T0130Z-120229T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
530 PM PST TUE FEB 28 2012

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL COOS COUNTY IN SOUTHWEST OREGON...
  CURRY COUNTY IN SOUTHWEST OREGON...
  THIS INCLUDES THE CITIES OF...GOLD BEACH...BROOKINGS...
  SOUTHWESTERN DOUGLAS COUNTY IN SOUTHWEST OREGON...
  EXTREME WEST CENTRAL JOSEPHINE COUNTY IN SOUTHWEST OREGON...

* UNTIL 615 PM PST

* AT 526 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH. SPOTTER REPORTS  
  HAVE INDICATED WINDS GUSTS IN EXCESS OF 75 MPH. THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM SIXES RIVER CAMPGROUND TO
  14 MILES SOUTHWEST OF BROOKINGS...OR ALONG A LINE EXTENDING FROM 14
  MILES EAST OF PORT ORFORD TO 14 MILES SOUTHWEST OF BROOKINGS...AND
  MOVING EAST AT 20 MPH. THIS WARNING REPLACES THE PREVIOUS SEVERE 
  THUNDERSTORM WARNING.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  PISTOL RIVER...POWERS...HARBOR AND AGNESS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4246 12449 4245 12444 4251 12445 4255 12441
      4264 12443 4291 12433 4291 12374 4199 12406
      4199 12422 4209 12436 4222 12439 4224 12443
      4241 12444 4245 12446 4244 12449
TIME...MOT...LOC 0127Z 270DEG 18KT 4283 12424 4196 12453

$$

SVEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 4:41 PM PST	Special Marine Warning	MFR		64 min
Feb 28, 4:46 PM PST	Severe Thunderstorm Warning	MFR	Coos, Curry	59 min
Feb 28, 5:50 PM PST	Special Marine Warning	MFR		25 min
Feb 28, 6:23 PM PST	Severe Thunderstorm Warning	MFR	Curry	22 min
Feb 28, 6:59 PM PST	Small Craft Advisory for Winds	MFR		36 hr

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.