Sacramento, CA...Roseville, CA...Redding, CA...Citrus Heights, CA...Chico, CA...
Probabilistic Tornado Graphic
Probability of a tornado within 25 miles of a point. Hatched Area: 10% or greater probability of EF2 - EF5 tornadoes within 25 miles of a point.
Day 1 Tornado Risk
Area (sq. mi.)
Area Pop.
Some Larger Population Centers in Risk Area
2 %
5,892
2,005,930
Sacramento, CA...Roseville, CA...Redding, CA...Citrus Heights, CA...Chico, CA...
Probabilistic Damaging Wind Graphic
Probability of damaging thunderstorm winds or wind gusts of 50 knots or higher within 25 miles of a point. Hatched Area: 10% of greater probability of wind gusts 65 knots or greater within 25 miles of a point.
Day 1 Wind Risk
Area (sq. mi.)
Area Pop.
Some Larger Population Centers in Risk Area
5 %
5,911
2,014,171
Sacramento, CA...Roseville, CA...Redding, CA...Citrus Heights, CA...Chico, CA...
Probabilistic Large Hail Graphic
Probability of hail 1" or larger within 25 miles of a point. Hatched Area: 10% or greater probability of hail 2" or larger within 25 miles of a point.
Day 1 Hail Risk
Area (sq. mi.)
Area Pop.
Some Larger Population Centers in Risk Area
No Risk Areas Forecast
SPC AC 041935
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0135 PM CST Mon Jan 04 2021
Valid 042000Z - 051200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
NORTHERN CALIFORNIA...
...SUMMARY...
Isolated strong thunderstorms may produce gusty winds and/or a
tornado this afternoon over a small part of northern California.
...DISCUSSION...
No changes are made to the forecast for this issuance.
..Broyles.. 01/04/2021
.PREV DISCUSSION... /ISSUED 1024 AM CST Mon Jan 04 2021/
...CA...
No changes have been made to the ongoing forecast. Scattered
lightning flashes are noted off the coast of northern CA in a
post-frontal regime with cold temperatures aloft and steep lapse
rates. This activity may move ashore this afternoon and evening,
with a few thunderstorms affecting parts of western WA/OR and
northern CA. Orographically backed low-level winds in the
Sacramento Valley, coupled with strong southwesterly flow aloft and
marginal CAPE values, will pose a risk of one or two low-topped
supercells this afternoon. It is unclear if the storms would be
sufficiently tall for charge separation. However, if activity can
become sustained, there is the potential for gusty/damaging winds or
a brief tornado or two. This threat should diminish around sunset.
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0100Z
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