Alert archive / California / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 10, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Jun 3, 2009, 3:44 PM PDT for Humboldt County, Trinity County, California. It was in force for 46 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
- Jun 3, 2009, 3:44 PM PDT (22:44 UTC)
- Expired
- Jun 3, 2009, 4:30 PM PDT
- In force
- 46 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
Counties Humboldt County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 68 km from the middle of the area, began a volume at 22:44 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 |
|---|---|---|---|
| Jun 3, 3:55 PM PDT | HAIL 1.75 | Hyampom, CA | AT THE HYAMPOM GENERAL STORE. SEVERE THUNDERSTORM WITHRAIN. 1/2 HAIL IN THE VALLEY. GOLF SIZE HAIL ON THE MOUNTAIN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 11 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 12:00Z, 10.7 hours before the alert went out and 194 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 873 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 75 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 032244 SVREKA CAC023-105-032330- /O.NEW.KEKA.SV.W.0010.090603T2244Z-090603T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EUREKA CA 344 PM PDT WED JUN 3 2009 THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA... WEST CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA... * UNTIL 430 PM PDT * AT 342 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR HYAMPOM...OR 23 MILES SOUTH OF WILLOW CREEK...AND MOVING NORTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... BURNT RANCH BY 430 PM PDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 4082 12369 4087 12343 4055 12336 4052 12354 TIME...MOT...LOC 2244Z 166DEG 14KT 4063 12350 $$ BC
1 follow-up statement
000 WWUS56 KEKA 032307 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 407 PM PDT WED JUN 3 2009 CAC023-105-032330- /O.CON.KEKA.SV.W.0010.000000T0000Z-090603T2330Z/ TRINITY CA-HUMBOLDT CA- 407 PM PDT WED JUN 3 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR EAST CENTRAL HUMBOLDT AND EXTREME WEST CENTRAL TRINITY COUNTIES... AT 406 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE. THIS STORM WAS LOCATED 8 MILES SOUTH OF BURNT RANCH...OR 17 MILES SOUTH OF WILLOW CREEK...MOVING NORTH AT 15 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... BURNT RANCH BY 430 PM PDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS HAIL UP TO ONE AND THREE QUARTERS INCHES IN DIAMETER HAS BEEN REPORTED NEAR HYAMPON WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY. && LAT...LON 4065 12345 4062 12358 4082 12369 4086 12347 TIME...MOT...LOC 2306Z 166DEG 14KT 4071 12353 $$ BC
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Eureka, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 3, 2:09 PM PDT, 1 hour 35 minutes earlier.
Area forecast discussion, Jun 3, 2:09 PM PDT, 1 hour 35 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE EUREKA CA 210 PM PDT WED JUNE 03 2009 SYNOPSIS...AN AREA OF LOW PRESSURE ALONG THE WEST COAST WILL CONTINUE TO PRODUCE SHOWERS AND ISOLATED THUNDERSTORMS TO NORTHWEST CALIFORNIA THROUGH THE END OF THE WEEK. && .SHORT TERM...TONIGHT THROUGH SATURDAY...SATELLITE AND RADAR IMAGERY SHOW CONVECTION DEVELOPING THIS AFTERNOON. EXPECT SCT SHRA AND ISOLD TSTMS TO CONTINUE TO DEVELOP OVER THE REGION AND PROPAGATE TO THE NW ACROSS THE CWA AS QUASI STATIONARY UPPER LOW REMAINS OFF THE COAST. STABILITY INDICES SHOW SLIGHT POTENTIAL FOR LARGE HAIL AND DAMAGING WINDS WITH STORMS THIS AFTERNOON...SO WILL CONTINUE TO MONITOR RADAR TRENDS THROUGH THIS EVENING. EXPECT CONVECTION TO PEAK BY EARLY THIS EVENING AS A MINOR SHORT WAVE ROTATES AROUND THE PARENT LOW WITH SHOWERS CONTINUING THROUGH THE NIGHT IN THE UNSTABLE ATMOSPHERE. A SERIES OF VORT MAXES WILL ROTATE AROUND THE LOW AND COMBINE WITH A RELATIVELY DEEP MOIST LAYER TO CONTINUE THE THREAT OF CONVECTION THU. MODELS IN GOOD AGREEMENT ON UPPER LOW DRIFTING ONSHORE FRI WITH AFTERNOON CONVECTION EXPECTED AGAIN. THE THREAT FOR TSTMS WILL DIMINISH SAT AS THE UPPER LOW MOVES E OF THE REGION. BC && .LONG TERM (SATURDAY NIGHT THROUGH WEDNESDAY)...THE MEDIUM RANGE MODELS CONTINUE TO SHOW SOME CHANGES IN HOW THE UPPER LOW IS HANDLED THROUGH THE INITIAL PART OF THE EXTENDED. HOWEVER THE GENERAL IDEA OF MOVING THE LOW ONSHORE AND DEVELOPING SPLIT FLOW ALOFT IS MAINTAINED. THE LATEST ITERATION BRINGS THE LOW ONSHORE SOUTH OF POINT CONCEPTION EARLY SATURDAY EVENING...AND INLAND ACROSS LAS VEGAS BY 12Z SUNDAY. THE SOUTHERN BRANCH OF THE SPLIT FLOW PUSHES A LOW WEST TO THE OFFSHORE WATERS EARLY NEXT WEEK. NORTHERN CALIFORNIA WILL REMAIN IN LIGHT NORTHERLY FLOW WITH LINGERING MOISTURE THROUGH MONDAY...WITH A WEAK SHORTWAVE FORECAST BY THE GFS TO BRUSH THE CWA LATE MONDAY INTO TUESDAY...FOLLOWED BY A SIMILAR WEAK SYSTEM EARLY WEDNESDAY. CILIBERTI && .MARINE...LIGHT WINDS AND LOW SEAS WILL PREVAIL THROUGH THE WEEK. THE SEAS WILL CONTAIN A MIX OF SHORT PERIOD NW SWELL AND LONG PERIOD SOUTH TO SW SWELL...WITH SIG WAVE HEIGHTS NEAR 3 FEET. ISOLATED THUNDERSTORMS WILL PERSIST THROUGH FRIDAY...BRINGING OCCASIONAL CLOUD-TO-WATER LIGHTNING STRIKES...HEAVY RAIN...HAIL AND SUDDEN BURSTS OF WIND. && .AVIATION...CONTINUED ADVECTION OF MOIST AIR AND INSTABILITY...ASSOCIATED WITH A LOW PRESSURE SYSTEM CENTERED OFF THE CENTRAL COAST...WILL PRODUCE SHOWERS AND THE THREAT OF THUNDERSTORMS ACROSS THE REGION. THE STORMS MAY PRODUCE HAIL...HEAVY RAIN AS WELL AS STRONG AND ABRUPT WINDS. THESE ARE STANDARD FLIGHT HAZARDS ASSOCIATED WITH CONVECTION...AND ARE THE PRIMARY RISK TO AVIATION. AS TYPICAL...POCKETS OF IFR TO MVFR CONDITIONS WILL CONTINUE ALONG THE COASTAL STRIP. ASHFORD && .EKA WATCHES/WARNINGS/ADVISORIES... NONE. && VISIT US AT HTTP://WWW.WEATHER.GOV/EUREKA
Hazardous weather outlook, Jun 3, 5:18 AM PDT, 10 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EUREKA CA 518 AM PDT WED JUN 3 2009 CAZ001>004-076-041230- REDWOOD COAST-MENDOCINO COAST-NORTH COAST INTERIOR- UPPER TRINITY RIVER-MENDOCINO INTERIOR- 518 AM PDT WED JUN 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST CALIFORNIA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORM ACTIVITY WILL CONTINUE ACROSS NORTHWEST CALIFORNIA TODAY AND TONIGHT. STORMS WILL BE ACCOMPANIED BY LIGHTNING...HAIL ...GUSTY WINDS AND POTENTIALLY HEAVY RAIN. ALTHOUGH A MAJORITY OF THE STORMS ARE NOT EXPECTED TO BECOME SEVERE...THE THREAT OF ISOLATED STORMS CONTAINING DAMAGING WINDS OR HAIL IS POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORM ACTIVITY WILL CONTINUE ACROSS NORTHWEST CALIFORNIA THROUGH THURSDAY. STORMS WILL BE ACCOMPANIED BY LIGHTNING...HAIL ...GUSTY WINDS AND POTENTIALLY HEAVY RAIN. ALTHOUGH A MAJORITY OF THE STORMS ARE NOT EXPECTED TO BECOME SEVERE...THE THREAT OF ISOLATED STORMS CONTAINING DAMAGING WINDS OR HAIL IS POSSIBLE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS SUCH AS LIGHTNING...STRONG WINDS...HAIL OR FLOODING TO THEIR LOCAL NATIONAL WEATHER SERVICE OFFICE.
In the hours before
Special weather statement, Jun 3, 2:47 PM PDT, 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 247 PM PDT WED JUN 3 2009 CAZ003-004-032230- TRINITY CA-HUMBOLDT CA- 247 PM PDT WED JUN 3 2009 THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... SOUTHEASTERN HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA SOUTHWESTERN TRINITY COUNTY IN NORTHWEST CALIFORNIA UNTIL 330 PM PDT AT 245 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 6 MILES SOUTHEAST OF RUTH..MOVING NORTHWEST AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS IMPACTED INCLUDE... RUTH... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. LAT...LON 4035 12365 4050 12339 4020 12316 4009 12335 TIME...MOT...LOC 2147Z 145DEG 11KT 4022 12333 BC
Special weather statement, Jun 3, 3:04 PM PDT, 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
304 PM PDT WED JUN 3 2009
CAZ003-004-076-032300-
TRINITY CA-MENDOCINO CA-
304 PM PDT WED JUN 3 2009
THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
NORTHEASTERN MENDOCINO COUNTY IN NORTHWEST CALIFORNIA
SOUTH CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA
UNTIL 400 PM PDT
AT 303 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES EAST OF COVELO..MOVING NORTH AT 15 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
LOCATIONS IMPACTED INCLUDE...
RURAL NORTHEASTERN MENDOCINO COUNTY...
RURAL SOUTHERN TRINITY COUNTY...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
LAT...LON 3967 12312 4001 12329 4008 12298 3987 12293
3984 12294 3982 12293 3975 12292 3975 12291
3972 12290
TIME...MOT...LOC 2204Z 165DEG 12KT 3978 12304
BCThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 6:15 PM PDT | Special Weather Statement | EKA | Mendocino | 45 min |
| Jun 2, 6:32 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 28 min |
| Jun 2, 7:15 PM PDT | Special Weather Statement | EKA | Siskiyou | 45 min |
| Jun 3, 2:43 PM PDT | Areal Flood Advisory | EKA | Mendocino | 3 hr |
| Jun 3, 2:47 PM PDT | Special Weather Statement | EKA | Trinity | 43 min |
| Jun 3, 3:04 PM PDT | Special Weather Statement | EKA | 56 min | |
| Jun 3, 3:21 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 24 min |
| Jun 3, 3:28 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino, Trinity | 32 min |
| Jun 3, 3:51 PM PDT | Special Weather Statement | EKA | Humboldt | 39 min |
| Jun 3, 4:00 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 18 min |
| Jun 3, 4:05 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 25 min |
| Jun 3, 4:20 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt | 25 min |
| Jun 3, 4:26 PM PDT | Special Weather Statement | EKA | Humboldt | 19 min |
| Jun 3, 4:36 PM PDT | Special Weather Statement | EKA | Mendocino | 24 min |
| Jun 3, 4:42 PM PDT | Special Weather Statement | EKA | Mendocino | 33 min |
| Jun 3, 4:47 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 13 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.