Alert archive / California / Tornado Warnings in 2025
Tornado Warning 2, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this tornado warning at Dec 25, 2025, 5:50 PM PST for San Mateo County, Santa Cruz County, California. It was in force for 25 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
- Dec 25, 2025, 5:50 PM PST (01:50 UTC)
- Expired
- Dec 25, 2025, 6:15 PM PST
- In force
- 25 min
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties San Mateo County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 40 km from the middle of the area, began a volume at 01:50 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
Oakland, CA (KOAK), launched 00:00Z, 1.8 hours before the alert went out and 60 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
- 86 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 975 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 250 m²/s²
- 0-3 km storm-relative helicity
- 429 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
354
WFUS56 KMTR 260150
TORMTR
CAC081-087-260215-
/O.NEW.KMTR.TO.W.0002.251226T0150Z-251226T0215Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service San Francisco CA
550 PM PST Thu Dec 25 2025
The National Weather Service in San Francisco has issued a
* Tornado Warning for...
Southeastern San Mateo County in northern California...
Northwestern Santa Cruz County in northern California...
* Until 615 PM PST.
* At 550 PM PST, a severe thunderstorm capable of producing a tornado
was located 14 miles west of Boulder Creek, or 20 miles southwest
of Palo Alto, moving northeast at 60 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
* Locations impacted include...
Mainly rural areas of Southeastern San Mateo and Northwestern Santa
Cruz Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 3713 12234 3714 12234 3715 12236 3717 12237
3718 12239 3720 12241 3724 12242 3727 12241
3725 12240 3730 12241 3736 12240 3727 12215
3725 12212 3711 12230 3712 12231 3711 12234
TIME...MOT...LOC 0149Z 205DEG 53KT 3715 12238
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
$$
BKM2 follow-up statements
186
WWUS56 KMTR 260200
SVSMTR
Severe Weather Statement
National Weather Service San Francisco CA
600 PM PST Thu Dec 25 2025
CAC087-260210-
/O.CAN.KMTR.TO.W.0002.000000T0000Z-251226T0215Z/
Santa Cruz CA-
600 PM PST Thu Dec 25 2025
...TORNADO WARNING IS CANCELLED FOR NORTHWESTERN SANTA CRUZ COUNTY...
The Tornado threat has moved away form Santa Cruz Co. The threat
remains for San Mateo Co
&&
LAT...LON 3727 12241 3726 12241 3725 12240 3729 12241
3736 12240 3729 12222 3718 12234 3720 12241
3721 12240 3721 12241 3723 12241 3723 12242
3724 12242
TIME...MOT...LOC 0150Z 205DEG 53KT 3717 12237
$$
CAC081-260215-
/O.CON.KMTR.TO.W.0002.000000T0000Z-251226T0215Z/
San Mateo CA-
600 PM PST Thu Dec 25 2025
...TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM PST FOR SOUTH
CENTRAL SAN MATEO COUNTY...
At 600 PM PST, a severe thunderstorm capable of producing a tornado
was located 10 miles south of Woodside, or 12 miles southwest of Palo
Alto, moving northeast at 60 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Mainly rural areas of South Central San Mateo County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
Report severe weather to your nearest law enforcement agency or the
National Weather Service office in San Francisco CA.
&&
LAT...LON 3727 12241 3726 12241 3725 12240 3729 12241
3736 12240 3729 12222 3718 12234 3720 12241
3721 12240 3721 12241 3723 12241 3723 12242
3724 12242
TIME...MOT...LOC 0150Z 205DEG 53KT 3717 12237
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<1.00 IN
$$
BKM674
WWUS56 KMTR 260210
SVSMTR
Severe Weather Statement
National Weather Service San Francisco CA
610 PM PST Thu Dec 25 2025
CAC081-260220-
/O.EXP.KMTR.TO.W.0002.000000T0000Z-251226T0215Z/
San Mateo CA-
610 PM PST Thu Dec 25 2025
...TORNADO WARNING WILL EXPIRE AT 615 PM PST FOR SOUTH CENTRAL SAN
MATEO COUNTY...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
&&
LAT...LON 3727 12241 3726 12241 3725 12240 3729 12241
3736 12240 3729 12222 3718 12234 3720 12241
3721 12240 3721 12241 3723 12241 3723 12242
3724 12242
TIME...MOT...LOC 0200Z 205DEG 53KT 3730 12229
$$
BKMThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 25, 4:08 PM PST | Special Marine Warning | MTR | 37 min | |
| Dec 25, 4:09 PM PST | Special Marine Warning | MTR | 20 min | |
| Dec 25, 4:17 PM PST | Special Weather Statement | MTR | San Mateo | 28 min |
| Dec 25, 4:19 PM PST | Special Marine Warning | MTR | 26 min | |
| Dec 25, 4:25 PM PST | Special Marine Warning | MTR | 35 min | |
| Dec 25, 4:31 PM PST | Special Marine Warning | MTR | 29 min | |
| Dec 25, 4:45 PM PST | Special Weather Statement | MTR | San Mateo | 15 min |
| Dec 25, 4:59 PM PST | Special Marine Warning | MTR | 31 min | |
| Dec 25, 5:01 PM PST | Special Marine Warning | MTR | 29 min | |
| Dec 25, 5:08 PM PST | Special Marine Warning | MTR | 20 min | |
| Dec 25, 5:26 PM PST | Special Marine Warning | MTR | 34 min | |
| Dec 25, 5:27 PM PST | Special Marine Warning | MTR | 16 min | |
| Dec 25, 5:30 PM PST | Special Marine Warning | MTR | 30 min | |
| Dec 25, 5:35 PM PST | Special Marine Warning | MTR | 38 min | |
| Dec 25, 5:37 PM PST | Severe Thunderstorm Warning | MTR | Marin, City and County of San Francisco | 23 min |
| Dec 25, 5:46 PM PST | Special Weather Statement | MTR | San Mateo | 29 min |
| Dec 25, 6:05 PM PST | Special Marine Warning | MTR | 25 min | |
| Dec 25, 6:11 PM PST | Special Marine Warning | MTR | 34 min | |
| Dec 25, 6:12 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 33 min |
| Dec 25, 6:13 PM PST | Areal Flood Advisory | MTR | San Mateo, Santa Clara, Santa Cruz | 2 hr |
| Dec 25, 6:18 PM PST | Special Weather Statement | MTR | San Mateo | 27 min |
| Dec 25, 6:21 PM PST | Areal Flood Advisory | MTR | City and County of San Francisco | 54 min |
| Dec 25, 6:35 PM PST | Areal Flood Advisory | MTR | Monterey, Santa Cruz | 3 hr |
| Dec 25, 6:35 PM PST | Severe Thunderstorm Warning | MTR | San Mateo, Santa Clara | 8 min |
| Dec 25, 6:44 PM PST | Areal Flood Advisory | MTR | Santa Clara | 2 hr |
| Dec 25, 6:54 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 36 min |
| Dec 25, 6:58 PM PST | Special Marine Warning | MTR | 10 min | |
| Dec 25, 7:07 PM PST | Special Weather Statement | MTR | Monterey | 53 min |
| Dec 25, 7:11 PM PST | Special Marine Warning | MTR | 49 min | |
| Dec 25, 7:13 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 19 min |
| Dec 25, 7:26 PM PST | Areal Flood Advisory | MTR | Monterey | 2 hr |
| Dec 25, 7:35 PM PST | Severe Thunderstorm Warning | MTR | Monterey | 25 min |
| Dec 25, 7:57 PM PST | Special Weather Statement | MTR | Monterey | 33 min |
| Dec 26, 12:41 AM PST | Areal Flood Advisory | MTR | Santa Clara, Santa Cruz | 4 hr |
| Dec 26, 3:08 AM PST | Small Craft Advisory | MTR | 48 hr | |
| Dec 26, 1:30 PM PST | Special Weather Statement | MTR | Santa Cruz | 30 min |
| Dec 26, 1:48 PM PST | Special Marine Warning | MTR | 27 min | |
| Dec 26, 2:19 PM PST | Special Marine Warning | MTR | 26 min | |
| Dec 26, 2:27 PM PST | Areal Flood Advisory | MTR | Napa, Sonoma | 3 hr |
| Dec 26, 2:30 PM PST | Special Weather Statement | MTR | Marin | 30 min |
Nearby
Tornado Warnings in California, 2025Every tornado warning in 2025Tornadoes in 2025
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.