Flash flood watch

Flash flood watch

A Flash flood watch is issued when conditions are favorable for flash flooding in flood-prone areas where grounds are already saturated from recent rains.

The Storm Prediction Center does not issue those watches, only National Weather Service offices can do so.

Example of a Flash Flood Watch

FLOOD WATCHNATIONAL WEATHER SERVICE SAN JUAN PR1037 AM AST SAT MAY 3 2008

PRZ001>011-040245-/O.EXT.TJSJ.FF.A.0002.000000T0000Z-080504T0300Z//00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR-NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST-WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-INCLUDING THE MUNICIPALITIES AND/OR ISLANDS OF...SAN JUAN...CAROLINA...FAJARDO...HUMACAO...GUAYAMA...ARROYO...YABUCOA...SALINAS...COCO...CAGUAS...ARECIBO...VEGA BAJA...DORADO...COAMO...COROZAL...AIBONITO...VILLALBA...JAYUYA...PONCE...AGUADILLA...ISABELA...HATILLO...QUEBRADILLAS...UTUADO...SABANA GRANDE...LARES...ADJUNTAS...HORMIGUEROS...MOCA...AGUADA...LUYANDO...CABO ROJO...LAJAS1037 AM AST SAT MAY 3 2008

...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING...

THE FLASH FLOOD WATCH IS NOW IN EFFECT FOR

* ALL OF PUERTO RICO

* THROUGH 11 PM THIS EVENING

* THE RAPID APPROACH OF ANOTHER MID TO UPPER LEVEL SHORT WAVE TROUGH DIGGING SOUTHEAST TOWARDS THE REGION...AND THE PROXIMITY OF A SURFACE TROUGH SINKING SOUTH ACROSS THE DOMINICAN REPUBLIC AND THE MONA PASSAGE...COMBINED WITH ABUNDANT LOW LEVEL TROPICAL MOISTURE AND DIURNAL AND LOCAL ISLAND EFFECTS...WILL AGAIN RESULT IN THE DEVELOPMENT OF SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS...SOME WITH VERY HEAVY RAINFALL ACROSS PUERTO RICO AT LEAST THROUGH THIS AFTERNOON. IN ADDITION...GROUNDS ACROSS THE WATCH AREA REMAIN AT OR NEAR SATURATION AND MANY RIVERS REMAIN AT ABOVE NORMAL LEVELS ESPECIALLY ALONG THE NORTHERN AND EAST SECTION OF THE ISLAND.

* ADDITIONAL RAINFALL OF 1 TO 3 INCHES...WITH LOCALLY HIGHER AMOUNTS POSSIBLY OVER 5 INCHES ARE EXPECTED OVER PARTS OF PUERTO RICO THROUGH THIS AFTERNOON AS SHOWERS ACTIVITY MAY RAPIDLY BE ENHANCED WITH THE DAYTIME HEATING. THIS RAINFALL COULD RESULT IN ADDITIONAL FLASH AND RIVER FLOODING. ALSO...ROCK AND MUDSLIDES (DEBRIS FLOW) ARE POSSIBLE OVER AREAS OF STEEP TERRAIN.

A FLASH FLOOD WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR HEAVYRAIN ACROSS THE WATCH AREA...WHICH MAY LEAD TO FLOODING. IF YOU AREIN THE WATCH AREA...CHECK YOUR PREPAREDNESS REQUIREMENTS...ESPECIALLYIF YOU HAVE INTERESTS ALONG AREA RIVERS. KEEP INFORMED... AND BEREADY FOR QUICK ACTION IF FLOODING IS OBSERVED OR IF A FLASH FLOODWARNING IS ISSUED.

PEOPLE IN THE WATCH AREA SHOULD CONTINUE TO BE AWARE OF THEPOSSIBILITY FOR HEAVY RAINFALL. AVOID LOW LYING AREAS...AND BECAREFUL WHEN APPROACHING HIGHWAY DIPS AND UNDERPASSES. ADDITIONALHEAVY RAIN MAY CONTINUE TO CAUSE MUDSLIDES IN AREAS OF STEEPTERRAIN.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL TV...RADIO OR YOUR CABLETELEVISION PROVIDER FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND CLIMATEINFORMATION...IS AVAILABLE ON THE WEB AT HTTP://WWW.SRH.NOAA.GOV/SJUOR AT HTTP://WEATHER.GOV.

$$

ee also

* Severe weather terminology (United States)
* Flash Flood Warning


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