Alert archive / California / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 4, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Nov 30, 1999, 11:12 AM PST for Humboldt County, California. It was in force for 63 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Nov 30, 1999, 11:12 AM PST (19:12 UTC)
- Expired
- Nov 30, 1999, 12:15 PM PST
- In force
- 63 min
- Issued by
- NWS Eureka, CA
- Area
- Whole counties
County Humboldt County, CA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Nov 30, 11:45 AM PST | Thunderstorm Wind 57 | Eureka, CA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 12:00Z, 7.2 hours before the alert went out and 207 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
- 701 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Nov 30, 8:30 AM PST, 2 hours 42 minutes earlier.
Area forecast discussion, Nov 30, 8:30 AM PST, 2 hours 42 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
830 AM PST TUE NOV 30 1999
RAIN NEVER REALLY SHUT OFF OVERNIGHT WITH SHOWERS CONTINUING IN FRONT
OF NEXT RAIN SHIELD THAT IS SHOWING UP OFFSHORE WITH NEXT SYSTEM.
THIS NEXT SYSTEM IS MOVING SLIGHTLY FASTER THAN WHAT THE MODELS HAD
FORECASTED YESTERDAY AND STILL HAS ITS SIGHTS SET ON THE NORTH COAST.
THE EXITING SYSTEM LOWERED THE SNOW LEVEL TO AROUND 4000 FEET THIS
MORNING AND SNOW ADVISORY FOR THIS LEVEL TODAY STILL LOOKS GOOD.
WILL BE UPDATING FORECAST TO LOWER HIGH TEMPS AS RAIN WILL START
SOONER AND FEEL THAT EVEN WITH THE SOUTH WIND...TEMPS WILL NOT RISE
VERY MUCH.
POPS CEC +66 EKA +64 UKI +62
.EKA...SMALL CRAFT ADVISORY PT ST GEORGE TO PT ARENA OUT TO 60 NM.
...SNOW ADVISORY ABOVE 4000 FEET FOR DEL
NORTE..HUMBOLDT..TRINITY AND MENDOCINO COUNTIES TODAY.
MICHELSThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 11:07 AM PST | Severe Thunderstorm Warning | EKA | Del Norte | 63 min |
Nearby
Severe Thunderstorm Warnings in California, 1999Every severe thunderstorm warning in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.