Alert archive / California / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 1, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at May 28, 2009, 3:38 PM PDT for Trinity County, California. It was in force for 37 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 28, 2009, 3:38 PM PDT (22:38 UTC)
- Expired
- May 28, 2009, 4:15 PM PDT
- In force
- 37 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
County Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 85 km from the middle of the area, began a volume at 22:38 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 28, 4:00 PM PDT | HAIL 0.75 | 9 E Hyampom, CA | 3/4 INCH HAIL REPORTED AT YOUTH CAMP 9 MI EAST OF HAYFORK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 12:00Z, 10.6 hours before the alert went out and 193 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1770 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS56 KEKA 282238 SVREKA CAC105-282315- /O.NEW.KEKA.SV.W.0001.090528T2238Z-090528T2315Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EUREKA CA 338 PM PDT THU MAY 28 2009 THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA... * UNTIL 415 PM PDT * AT 337 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL. THIS STORM WAS LOCATED 8 MILES SOUTHWEST OF BIG BAR...OR 22 MILES WEST OF WEAVERVILLE...AND MOVING NORTH AT 10 MPH. * THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. 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 4078 12338 4070 12314 4053 12327 4058 12341 TIME...MOT...LOC 2238Z 198DEG 7KT 4062 12332 $$ MAB/BK
2 follow-up statements
000 WWUS56 KEKA 282259 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 359 PM PDT THU MAY 28 2009 CAC105-282315- /O.CON.KEKA.SV.W.0001.000000T0000Z-090528T2315Z/ TRINITY CA- 359 PM PDT THU MAY 28 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR CENTRAL TRINITY COUNTY... AT 350 PM PDT...THE PUBLIC REPORTED DIME SIZE HAIL WITH THIS THUNDERSTORM. THIS STORM WAS LOCATED 6 MILES SOUTHWEST OF BIG BAR...OR 20 MILES WEST OF WEAVERVILLE...MOVING NORTH AT 10 MPH. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4078 12338 4070 12314 4053 12327 4058 12341 TIME...MOT...LOC 2258Z 198DEG 7KT 4066 12330 $$ MB/BK
000 WWUS56 KEKA 282315 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 415 PM PDT THU MAY 28 2009 CAC105-282322- /O.CAN.KEKA.SV.W.0001.000000T0000Z-090528T2315Z/ TRINITY CA- 415 PM PDT THU MAY 28 2009 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TRINITY COUNTY IS CANCELLED... AT 415 PM...DOPPLER RADAR INDICATED THE THUNDERSTORM 3 MILES EAST OF HYAMPOM WHICH PROMPTED THE WARNING HAD WEAKENED. HOWEVER HEAVY RAIN AND SMALL HAIL IS STILL POSSIBLE WITH THIS STORM. LAT...LON 4078 12338 4070 12314 4053 12327 4058 12341 TIME...MOT...LOC 2312Z 198DEG 7KT 4068 12329 $$ BK/MB
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 4:30 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 30 min |
Nearby
Severe Thunderstorm Warnings in California, 2009Every severe thunderstorm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.