diff --git a/nowcast-point-update.example.csv b/nowcast-point-update.example.csv
new file mode 100644
index 0000000..2b56269
--- /dev/null
+++ b/nowcast-point-update.example.csv
@@ -0,0 +1 @@
+registrationId;recipientId;lat;lng;radius;lightningType;peakCurrent;inCloudHeight;intersectsAffectedPolygon;intersectsCellPolygon;severityThreshold;speedThreshold;precipitationIntensities
diff --git a/nowcast-point-update.py b/nowcast-point-update.py
new file mode 100644
index 0000000..a752501
--- /dev/null
+++ b/nowcast-point-update.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+"""Patch point alarm registrations from a CSV file (blank cells are not sent)."""
+
+from __future__ import annotations
+
+import argparse
+import logging
+import sys
+from pathlib import Path
+
+from common import ApiError, ConfigurationError, IklimClient, configure_logging
+from point_alarm import PointAlarmService, PointUpdateProcessor
+
+
+BASE_DIR = Path(__file__).resolve().parent
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description=(
+            "CSV satırlarından nokta alarm kayıtlarını kısmen günceller (PATCH). Sütunlar: "
+            "registrationId (zorunlu) ve isteğe bağlı recipientId;lat;lng;radius;lightningType;"
+            "peakCurrent;inCloudHeight;intersectsAffectedPolygon;intersectsCellPolygon;"
+            "severityThreshold;speedThreshold;precipitationIntensities ('|' ile ayrılır). Boş hücre "
+            "gönderilmez; lat ve lng birlikte verilmelidir. Bir alan boşaltılamaz (temizleme "
+            "desteklenmez). thunderstorm.speedThreshold backend PATCH'inde işlenmiyor (GAIA-476). "
+            "Sonuç sütunları status;httpStatus;errorBody aynı dosyaya yazılır."
+        )
+    )
+    parser.add_argument("csv_file", type=Path, help="İşlenecek noktalı virgüllü CSV")
+    parser.add_argument(
+        "--dry-run",
+        action="store_true",
+        help="İstek göndermeden ve CSV'yi değiştirmeden PATCH gövdelerini ekrana yazar",
+    )
+    parser.add_argument(
+        "--debug-log",
+        type=Path,
+        default=BASE_DIR / "logs" / "iklim-api-debug.log",
+        help="Maskelenmiş HTTP debug log dosyası",
+    )
+    return parser.parse_args()
+
+
+def main() -> int:
+    args = parse_args()
+    configure_logging(args.debug_log)
+    try:
+        client = IklimClient.from_env(BASE_DIR / ".env")
+        PointUpdateProcessor(
+            PointAlarmService(client), csv_path=args.csv_file, dry_run=args.dry_run
+        ).run()
+    except (ConfigurationError, ApiError, OSError) as exc:
+        logging.error("İşlem durduruldu: %s", exc)
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/point_alarm.py b/point_alarm.py
index af934b2..261d685 100644
--- a/point_alarm.py
+++ b/point_alarm.py
@@ -765,3 +765,181 @@ class PointRegistrationProcessor:
         row["httpStatus"] = http_status
         row["registrationId"] = registration_id
         row["errorBody"] = error_body
+
+
+def _blank(value: Any) -> bool:
+    return value is None or str(value).strip() == ""
+
+
+def _number(row: dict[str, Any], name: str) -> float | None:
+    if _blank(row.get(name)):
+        return None
+    try:
+        return float(str(row[name]).strip().replace(",", "."))
+    except ValueError as exc:
+        raise ConfigurationError(f"{name} sayı olmalıdır.") from exc
+
+
+def _choice(row: dict[str, Any], name: str, allowed: set[str]) -> str | None:
+    if _blank(row.get(name)):
+        return None
+    value = str(row[name]).strip().upper()
+    if value not in allowed:
+        raise ConfigurationError(f"{name} şunlardan biri olmalıdır: {', '.join(sorted(allowed))}.")
+    return value
+
+
+def _flag(row: dict[str, Any], name: str) -> bool | None:
+    if _blank(row.get(name)):
+        return None
+    value = str(row[name]).strip().lower()
+    if value in {"true", "1", "evet"}:
+        return True
+    if value in {"false", "0", "hayır", "hayir"}:
+        return False
+    raise ConfigurationError(f"{name} true veya false olmalıdır.")
+
+
+def build_update_payload(row: dict[str, Any]) -> dict[str, Any]:
+    """Build a PATCH body from a CSV row; blank cells are left out (null = untouched)."""
+    registration_id = as_uuid(str(row.get("registrationId", "")).strip(), version=4)
+    if not registration_id:
+        raise ConfigurationError("registrationId geçerli bir UUID olmalıdır.")
+    payload: dict[str, Any] = {"registrationId": registration_id}
+    recipient_id = str(row.get("recipientId") or "").strip()
+    if recipient_id:
+        if not recipient_id.isascii():
+            raise ConfigurationError("recipientId US-ASCII karakterlerinden oluşmalıdır.")
+        payload["recipientId"] = recipient_id
+
+    lat, lng, radius = _number(row, "lat"), _number(row, "lng"), _number(row, "radius")
+    if (lat is None) != (lng is None):
+        raise ConfigurationError("lat ve lng birlikte verilmelidir.")
+    boundary: dict[str, Any] = {}
+    if lat is not None:
+        if not -90 <= lat <= 90 or not -180 <= lng <= 180:
+            raise ConfigurationError("lat -90..90, lng -180..180 aralığında olmalıdır.")
+        boundary["point"] = {"lat": lat, "lng": lng}
+    if radius is not None:
+        if not 0 <= radius <= MAX_RADIUS_METERS:
+            raise ConfigurationError(f"radius 0..{int(MAX_RADIUS_METERS)} metre aralığında olmalıdır.")
+        boundary["radius"] = radius
+    if boundary:
+        payload["boundary"] = boundary
+
+    lightning = {
+        key: value
+        for key, value in {
+            "type": _choice(row, "lightningType", LIGHTNING_TYPES),
+            "peakCurrent": _number(row, "peakCurrent"),
+            "inCloudHeight": _number(row, "inCloudHeight"),
+        }.items()
+        if value is not None
+    }
+    thunderstorm = {
+        key: value
+        for key, value in {
+            "intersectsAffectedPolygon": _flag(row, "intersectsAffectedPolygon"),
+            "intersectsCellPolygon": _flag(row, "intersectsCellPolygon"),
+            "severityThreshold": _choice(row, "severityThreshold", SEVERITIES),
+            "speedThreshold": _number(row, "speedThreshold"),
+        }.items()
+        if value is not None
+    }
+    precipitation: dict[str, Any] = {}
+    if not _blank(row.get("precipitationIntensities")):
+        items = [part.strip().upper() for part in str(row["precipitationIntensities"]).split("|") if part.strip()]
+        invalid = [item for item in items if item not in INTENSITIES]
+        if invalid or not items:
+            raise ConfigurationError(
+                "precipitationIntensities '|' ile ayrılmış geçerli değerler içermelidir: "
+                + ", ".join(sorted(INTENSITIES))
+            )
+        precipitation["intensities"] = items
+    filters = {
+        name: section
+        for name, section in (
+            ("lightning", lightning),
+            ("thunderstorm", thunderstorm),
+            ("precipitation", precipitation),
+        )
+        if section
+    }
+    if filters:
+        payload["filter"] = filters
+    if len(payload) == 1:
+        raise ConfigurationError("Güncellenecek alan yok (registrationId dışında tüm hücreler boş).")
+    return payload
+
+
+UPDATE_REQUIRED_COLUMNS = ["registrationId"]
+UPDATE_COLUMNS = ["registrationId", "recipientId", "lat", "lng", "radius"] + FILTER_COLUMNS
+
+
+class PointUpdateProcessor:
+    """PATCH one registration per CSV row; blank cells are not sent."""
+
+    def __init__(self, service: PointAlarmService, *, csv_path: Path, dry_run: bool = False) -> None:
+        self.service = service
+        self.csv_path = csv_path.resolve()
+        self.dry_run = dry_run
+
+    def run(self) -> None:
+        rows, fieldnames = self._read_csv()
+        for row_number, row in enumerate(rows, start=2):
+            if str(row.get("status", "")).strip().upper() == "SUCCESS":
+                LOGGER.info("Satır %s zaten SUCCESS; atlandı.", row_number)
+                continue
+            try:
+                payload = build_update_payload(row)
+            except ConfigurationError as exc:
+                LOGGER.error("Satır %s gönderilmedi: %s", row_number, exc)
+                self._set_result(row, "FAILED", "NOT_SENT", str(exc))
+                self._write(rows, fieldnames)
+                continue
+            if payload.get("filter", {}).get("thunderstorm", {}).get("speedThreshold") is not None:
+                LOGGER.warning(
+                    "Satır %s: thunderstorm.speedThreshold PATCH'te backend tarafından işlenmiyor "
+                    "(GAIA-476); değer gönderilir ancak güncellenmeyebilir.",
+                    row_number,
+                )
+            if self.dry_run:
+                print(f"[dry-run] satır {row_number}: PATCH {ALARMS_PATH}/update {json.dumps(payload, ensure_ascii=False)}")
+                continue
+            try:
+                response = self.service.update(payload, str(uuid4()))
+            except ApiError as exc:
+                self._set_result(
+                    row, "FAILED",
+                    f"HTTP_{exc.status_code}" if exc.status_code else "NETWORK_ERROR",
+                    error_body_text(exc),
+                )
+                LOGGER.error("Satır %s başarısız: %s", row_number, exc)
+            else:
+                self._set_result(row, "SUCCESS", f"HTTP_{response.status_code}", "")
+                LOGGER.info("Satır %s güncellendi: %s", row_number, payload["registrationId"])
+                for warning in response_warnings(response.data):
+                    LOGGER.warning("Satır %s API uyarısı: %s", row_number, warning)
+            self._write(rows, fieldnames)
+
+    def _read_csv(self) -> tuple[list[dict[str, Any]], list[str]]:
+        if not self.csv_path.is_file():
+            raise ConfigurationError(f"CSV dosyası bulunamadı: {self.csv_path}")
+        with self.csv_path.open("r", encoding="utf-8-sig", newline="") as handle:
+            reader = csv.DictReader(handle, delimiter=";")
+            if not reader.fieldnames or "registrationId" not in reader.fieldnames:
+                raise ConfigurationError("CSV başlığında 'registrationId' sütunu bulunamadı.")
+            fieldnames = [n for n in reader.fieldnames if n not in ("status", "httpStatus", "errorBody")] + [
+                "status", "httpStatus", "errorBody",
+            ]
+            return list(reader), fieldnames
+
+    def _write(self, rows: list[dict[str, Any]], fieldnames: list[str]) -> None:
+        if not self.dry_run:
+            write_csv_atomic(self.csv_path, rows, fieldnames)
+
+    @staticmethod
+    def _set_result(row: dict[str, Any], status: str, http_status: str, error_body: str) -> None:
+        row["status"] = status
+        row["httpStatus"] = http_status
+        row["errorBody"] = error_body
diff --git a/tests/test_point_alarm.py b/tests/test_point_alarm.py
index eee8631..a5ba9e4 100644
--- a/tests/test_point_alarm.py
+++ b/tests/test_point_alarm.py
@@ -15,6 +15,8 @@ from common import ApiError, ConfigurationError
 from common.client import ApiResponse
 from point_alarm import (
     PointRegistrationProcessor,
+    PointUpdateProcessor,
+    build_update_payload,
     PointStore,
     fetch_pages,
     flatten_registration,
@@ -243,5 +245,54 @@ class RegisterTest(unittest.TestCase):
         self.assertEqual(rows[0]["status"], "FAILED")
 
 
+class UpdateTest(unittest.TestCase):
+    def test_payload_skips_blank_cells(self) -> None:
+        payload = build_update_payload(
+            {"registrationId": REG_ID, "lat": "39.9", "lng": "32.8", "radius": "",
+             "severityThreshold": "high", "precipitationIntensities": "light|heavy"}
+        )
+        self.assertEqual(payload["boundary"], {"point": {"lat": 39.9, "lng": 32.8}})
+        self.assertEqual(payload["filter"]["thunderstorm"], {"severityThreshold": "HIGH"})
+        self.assertEqual(payload["filter"]["precipitation"]["intensities"], ["LIGHT", "HEAVY"])
+
+    def test_payload_errors(self) -> None:
+        for row in (
+            {"registrationId": REG_ID},
+            {"registrationId": REG_ID, "lat": "39"},
+            {"registrationId": "x", "radius": "5"},
+            {"registrationId": REG_ID, "radius": "60000"},
+            {"registrationId": REG_ID, "lightningType": "BAD"},
+        ):
+            with self.assertRaises(ConfigurationError, msg=row):
+                build_update_payload(row)
+
+    def test_dry_run_does_not_call_or_write(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "u.csv"
+            text = f"registrationId;radius\n{REG_ID};500\n"
+            path.write_text(text, encoding="utf-8")
+
+            class Boom:
+                def update(self, *_):
+                    raise AssertionError("must not be called")
+
+            PointUpdateProcessor(Boom(), csv_path=path, dry_run=True).run()
+            self.assertEqual(path.read_text(encoding="utf-8"), text)
+
+    def test_update_records_result(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "u.csv"
+            path.write_text(f"registrationId;radius\n{REG_ID};500\n", encoding="utf-8")
+
+            class Svc:
+                def update(self, payload, key):
+                    return ApiResponse(200, {})
+
+            PointUpdateProcessor(Svc(), csv_path=path).run()
+            with path.open(encoding="utf-8-sig", newline="") as handle:
+                row = next(csv.DictReader(handle, delimiter=";"))
+            self.assertEqual((row["status"], row["httpStatus"]), ("SUCCESS", "HTTP_200"))
+
+
 if __name__ == "__main__":
     unittest.main()