Alert archive / Oregon / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Medford, OR

July 29, 2021Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Jul 29, 2021, 9:26 PM PDT for Klamath County, Oregon. It was in force for 34 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: Jul 29, 2021, 9:26 PM PDT (04:26 UTC)
Expired: Jul 29, 2021, 10:00 PM PDT
In force: 34 min
Issued by: NWS Medford, OR
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Klamath County, OR

The radar

The Medford radar (KMAX), 92 km from the middle of the area, began a volume at 04:25 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, 4.4 hours before the alert went out and 79 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: 347 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 3562 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -57 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

363 
WUUS56 KMFR 300426
SVRMFR
ORC035-300500-
/O.NEW.KMFR.SV.W.0002.210730T0426Z-210730T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Medford OR
926 PM PDT Thu Jul 29 2021

The National Weather Service in Medford has issued a

* Severe Thunderstorm Warning for...
  Western Klamath County in south central Oregon...

* Until 1000 PM PDT.

* At 925 PM PDT, a severe thunderstorm was located over Wood River
  Wetland, or 19 miles south of Crater Lake, moving northwest at 20
  mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Fort Klamath, Jackson F. Kimball State Park, Collier Memorial State
  Park and Wood River Wetland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4265 12180 4259 12191 4259 12205 4277 12205
      4276 12200 4272 12190
TIME...MOT...LOC 0425Z 128DEG 17KT 4263 12198 

HAIL...1.25IN
WIND...60MPH
 
$$

BTL

1 follow-up statement

759 
WWUS56 KMFR 300454
SVSMFR

Severe Weather Statement
National Weather Service Medford OR
954 PM PDT Thu Jul 29 2021

ORC035-300503-
/O.EXP.KMFR.SV.W.0002.000000T0000Z-210730T0500Z/
Klamath OR-
954 PM PDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN KLAMATH COUNTY WILL
EXPIRE AT 1000 PM PDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will 
be allowed to expire.  However heavy rain and significant run-off is 
still possible with this thunderstorm. If you come across a flooded 
area, do not try to cross it.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Medford.

LAT...LON 4265 12180 4259 12191 4259 12205 4277 12205
      4276 12200 4272 12190
TIME...MOT...LOC 0453Z 128DEG 17KT 4269 12208 

$$

BTL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:52 PM PDT	Special Weather Statement	MFR	Jackson	38 min
Jul 29, 6:29 PM PDT	Special Weather Statement	MFR	Jackson	46 min
Jul 29, 9:11 PM PDT	Special Weather Statement	MFR	Klamath	49 min
Jul 29, 10:04 PM PDT	Special Weather Statement	MFR	Klamath	26 min
Jul 30, 12:48 PM PDT	Fire Weather Watch	MFR	Douglas, Harney, Jackson, Klamath, Lake, Lane	25 hr
Jul 30, 12:48 PM PDT	Red Flag Warning	MFR	Douglas, Harney, Jackson, Josephine, Klamath, Lake and 1 more	33 hr
Jul 30, 1:44 PM PDT	Heat Advisory	MFR	Curry, Jackson, Josephine	4 days

Nearby

Severe Thunderstorm Warnings in Oregon, 2021 Every severe thunderstorm warning in 2021

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.