diff --git a/internal/site/src/components/active-alerts.tsx b/internal/site/src/components/active-alerts.tsx
index 41af5f35d..e00efd269 100644
--- a/internal/site/src/components/active-alerts.tsx
+++ b/internal/site/src/components/active-alerts.tsx
@@ -1,10 +1,11 @@
 import { alertInfo } from "@/lib/alerts"
 import { $alerts, $allSystemsById } from "@/lib/stores"
+import { useBrowserStorage } from "@/lib/utils"
 import type { AlertRecord } from "@/types"
 import { Plural, Trans } from "@lingui/react/macro"
 import { useStore } from "@nanostores/react"
 import { getPagePath } from "@nanostores/router"
-import { useMemo, useState } from "react"
+import { useEffect, useMemo, useState } from "react"
 import { AlertBannerSheet, AlertBannerSheetItem } from "./alert-banner-sheet"
 import { $router } from "./router"
 
@@ -49,6 +50,9 @@ export const ActiveAlerts = ({ className }: { className?: string }) => {
 	const alerts = useStore($alerts)
 	const systems = useStore($allSystemsById)
 	const [open, setOpen] = useState(false)
+	// ids of the alerts that were active when the banner was last dismissed.
+	// session storage because a retrigger while the page is closed keeps the same id.
+	const [dismissedIds, setDismissedIds] = useBrowserStorage<string[]>("dismissedAlerts", [], sessionStorage)
 
 	const { activeAlerts, systemCount, alertsKey } = useMemo(() => {
 		const activeAlerts: AlertRecord[] = []
@@ -69,9 +73,24 @@ export const ActiveAlerts = ({ className }: { className?: string }) => {
 		return { activeAlerts, systemCount: systemIds.size, alertsKey: alertsKey.join("") }
 	}, [alerts])
 
+	// forget dismissed alerts once they resolve so they show again if they retrigger.
+	// skipped while alerts are still loading so a reload doesn't clear the dismissal,
+	// and re-run once loaded in case they resolved while the page was closed.
+	const alertsLoaded = Object.keys(alerts).length > 0
+	useEffect(() => {
+		if (!alertsLoaded) {
+			return
+		}
+		const activeIds = new Set(activeAlerts.map((alert) => alert.id))
+		if (dismissedIds.some((id) => !activeIds.has(id))) {
+			setDismissedIds(dismissedIds.filter((id) => activeIds.has(id)))
+		}
+	}, [alertsKey, alertsLoaded])
+
 	return useMemo(() => {
 		const alertCount = activeAlerts.length
-		if (alertCount === 0) {
+		// stay hidden after dismissing until an alert triggers that wasn't active at the time
+		if (alertCount === 0 || activeAlerts.every((alert) => dismissedIds.includes(alert.id))) {
 			return null
 		}
 		// name the alert directly in the banner when there is only one
@@ -80,6 +99,7 @@ export const ActiveAlerts = ({ className }: { className?: string }) => {
 			<AlertBannerSheet
 				open={open}
 				onOpenChange={setOpen}
+				onDismiss={() => setDismissedIds(activeAlerts.map((alert) => alert.id))}
 				className={className}
 				title={
 					alertCount === 1 ? (
@@ -117,5 +137,5 @@ export const ActiveAlerts = ({ className }: { className?: string }) => {
 				})}
 			</AlertBannerSheet>
 		)
-	}, [alertsKey, systemCount, systems, open, className])
+	}, [alertsKey, systemCount, systems, open, className, dismissedIds])
 }
diff --git a/internal/site/src/components/alert-banner-sheet.tsx b/internal/site/src/components/alert-banner-sheet.tsx
index ab066f954..a109fe973 100644
--- a/internal/site/src/components/alert-banner-sheet.tsx
+++ b/internal/site/src/components/alert-banner-sheet.tsx
@@ -1,5 +1,5 @@
-import { Trans } from "@lingui/react/macro"
-import { ChevronRightIcon, type LucideIcon, TriangleAlertIcon } from "lucide-react"
+import { Trans, useLingui } from "@lingui/react/macro"
+import { ChevronRightIcon, type LucideIcon, TriangleAlertIcon, XIcon } from "lucide-react"
 import type { ReactNode } from "react"
 import { cn } from "@/lib/utils"
 import { Link } from "./router"
@@ -20,6 +20,7 @@ export function AlertBannerSheet({
 	sheetTitle,
 	sheetDescription,
 	icon: Icon = TriangleAlertIcon,
+	onDismiss,
 	className,
 	children,
 }: {
@@ -31,9 +32,12 @@ export function AlertBannerSheet({
 	sheetTitle: ReactNode
 	sheetDescription?: ReactNode
 	icon?: LucideIcon
+	/** Shows a dismiss button when provided */
+	onDismiss?: () => void
 	className?: string
 	children: ReactNode
 }) {
+	const { t } = useLingui()
 	return (
 		<Sheet open={open} onOpenChange={onOpenChange}>
 			<Alert variant="destructive" className={cn("flex items-center gap-3 py-3 max-sm:flex-wrap", className)}>
@@ -42,7 +46,7 @@ export function AlertBannerSheet({
 					<div className="min-w-0">
 						<AlertTitle className="m-0">{title}</AlertTitle>
 						{description && (
-							<AlertDescription className="text-destructive/80 dark:text-red-500/80">{description}</AlertDescription>
+							<AlertDescription className="text-destructive/80 dark:text-red-400/80">{description}</AlertDescription>
 						)}
 					</div>
 				</div>
@@ -50,12 +54,24 @@ export function AlertBannerSheet({
 					<Button
 						variant="outline"
 						size="sm"
-						className="shrink-0 bg-transparent border-destructive/40 text-destructive hover:bg-destructive/10 hover:text-destructive dark:text-red-500 dark:hover:bg-destructive/15 dark:hover:text-red-500 max-sm:w-full"
+						className="shrink-0 bg-transparent border-destructive/40 text-destructive hover:bg-destructive/10 hover:text-destructive dark:text-red-400 dark:hover:bg-destructive/15 dark:hover:text-red-400 max-sm:w-full max-sm:order-last"
 					>
 						{buttonLabel ?? <Trans>View details</Trans>}
 						<ChevronRightIcon className="size-4 ms-1 -me-1" />
 					</Button>
 				</SheetTrigger>
+				{onDismiss && (
+					<Button
+						variant="ghost"
+						size="icon"
+						onClick={onDismiss}
+						aria-label={t`Dismiss`}
+						title={t`Dismiss`}
+						className="size-8 shrink-0 -me-1.5 text-destructive/70 hover:bg-destructive/10 hover:text-destructive dark:text-red-400/70 dark:hover:bg-destructive/15 dark:hover:text-red-400"
+					>
+						<XIcon className="size-4" />
+					</Button>
+				)}
 			</Alert>
 			<SheetContent className="w-140 !max-w-full gap-0">
 				<SheetHeader className="p-4 sm:p-6 pb-3 sm:pb-4 border-b">
@@ -88,7 +104,7 @@ export function AlertBannerSheetItem({
 			onClick={onClick}
 			className="group flex items-start gap-3 rounded-lg border p-3 transition-colors hover:bg-accent/60"
 		>
-			<div className="rounded-md bg-destructive/10 p-2 text-destructive shrink-0">
+			<div className="rounded-md bg-destructive/10 p-2 text-destructive dark:text-red-400 shrink-0">
 				<Icon className="size-4" />
 			</div>
 			<div className="min-w-0 flex-1">
diff --git a/internal/site/src/components/ui/alert.tsx b/internal/site/src/components/ui/alert.tsx
index 52e922370..2b187be5d 100644
--- a/internal/site/src/components/ui/alert.tsx
+++ b/internal/site/src/components/ui/alert.tsx
@@ -10,7 +10,7 @@ const alertVariants = cva(
 			variant: {
 				default: "bg-background text-foreground [&>svg]:text-foreground",
 				destructive:
-					"bg-destructive/5 border-destructive/50 text-destructive dark:bg-destructive/6 dark:text-red-500 dark:border-destructive/70 [&>svg]:text-destructive",
+					"bg-destructive/5 border-destructive/50 text-destructive dark:bg-destructive/6 dark:text-red-400 dark:border-destructive/50 [&>svg]:text-destructive dark:[&>svg]:text-red-400",
 			},
 		},
 		defaultVariants: {
diff --git a/internal/site/src/lib/utils.ts b/internal/site/src/lib/utils.ts
index 4860c7060..a85bed083 100644
--- a/internal/site/src/lib/utils.ts
+++ b/internal/site/src/lib/utils.ts
@@ -229,14 +229,14 @@ function getStorageValue(key: string, defaultValue: unknown, storageInterface: S
 /** Hook to sync value in local or session storage */
 export function useBrowserStorage<T>(key: string, defaultValue: T, storageInterface: Storage = localStorage) {
 	key = `besz-${key}`
-	const [value, setValue] = useState(() => {
+	const [value, setValue] = useState<T>(() => {
 		return getStorageValue(key, defaultValue, storageInterface)
 	})
 	useEffect(() => {
 		storageInterface?.setItem(key, JSON.stringify(value))
 	}, [key, value])
 
-	return [value, setValue]
+	return [value, setValue] as const
 }
 
 /** Format temperature to user's preferred unit */