Alert archive / New York / Areal Flood Advisories in 2011

Areal Flood Advisory 21, NWS Buffalo, NY

May 13, 2011Allegany County, New York

NWS Buffalo, NY issued this areal flood advisory at May 13, 2011, 4:25 PM EDT for Allegany County, New York. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 13, 2011, 4:25 PM EDT (20:25 UTC)
Expired: May 13, 2011, 9:15 PM EDT
In force: 5 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 97 km from the middle of the area, began a volume at 20:28 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.4 hours before the alert went out and 93 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 4 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

438 
WGUS81 KBUF 132025
FLSBUF

FLOOD ADVISORY
NATIONAL WEATHER SERVICE BUFFALO NY
425 PM EDT FRI MAY 13 2011

NYC003-132315-
/O.NEW.KBUF.FA.Y.0021.110513T2025Z-110513T2315Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
425 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
  ALLEGANY COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITY OF WELLSVILLE...

* UNTIL 715 PM EDT

* AT 421 PM EDT RADAR SHOWED SLOW MOVING STORMS ACROSS MUCH OF       
  ALLEGANY COUNTY. SOME STORMS WILL PRODUCE HEAVY RAINFALL RATES IN  
  EXCESS OF AN INCH AN HOUR. THIS WILL RESULT IN RAPID RISES ON SOME 
  AREA CREEKS. BE ALERT FOR RAPID RISES IN SOME CREEKS AND PONDING   
  OF WATER IN AREAS OF POOR DRAINAGE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON
SMALL CREEKS AND STREAMS...AND PONDING OF WATER ON COUNTRY ROADS AND
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 4231 7831 4247 7773 4247 7772 4200 7774
      4199 7831

$$

APFFEL

3 follow-up statements

984 
WGUS81 KBUF 132214
FLSBUF

FLOOD ADVISORY
NATIONAL WEATHER SERVICE BUFFALO NY
614 PM EDT FRI MAY 13 2011

NYC003-132315-
/O.CON.KBUF.FA.Y.0021.000000T0000Z-110513T2315Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-
614 PM EDT FRI MAY 13 2011

...THE URBAN AND SMALL STREAM FLOOD ADVISORY REMAINS IN EFFECT UNTIL
715 PM EDT FOR ALLEGANY COUNTY...

AT 610 PM EDT RADAR CONTINUED TO SHOW HEAVY RAIN ACROSS MUCH OF 
ALLEGANY COUNTY. HEAVIEST RAIN HAS BEEN NORTH OF WELLSVILLE...WHERE 
A FLASH FLOOD WARNING WAS ISSUED. SOUTH OF WELLSVILLE...RAIN HAS 
STILL BEEN SIGNIFICANT. SOUTH OF WELLSVILLE...EXPECT CREEKS TO 
APPROACH BANKFUL...WITH PONDING OF WATER ON ROADWAYS LIKELY IN SPOTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON
SMALL CREEKS AND STREAMS...AND PONDING OF WATER IN URBAN AREAS...
HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE
AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4231 7831 4247 7773 4247 7772 4200 7774
      4199 7831

$$

APFFEL

044 
WGUS81 KBUF 132303
FLSBUF

FLOOD ADVISORY
NATIONAL WEATHER SERVICE BUFFALO NY
703 PM EDT FRI MAY 13 2011

NYC003-140115-
/O.EXT.KBUF.FA.Y.0021.000000T0000Z-110514T0115Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
703 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS EXTENDED THE

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR MINOR FLOODING OF POOR
  DRAINAGE AREAS IN...
  ALLEGANY COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITY OF WELLSVILLE...

* UNTIL 915 PM EDT

* AT 700 PM EDT RADAR SHOWS THAT THE HEAVIEST RAIN HAS ENDED ACROSS  
  ALLEGANY COUNTY...WITH ADDITIONAL RAINFALL TOTALS EXPECTED TO BE   
  LESS THAN A QUARTER INCH. HOWEVER...EARLIER HEAVY RAINS HAS        
  RESULTED IN NUMEROUS ROAD CLOSURES ACROSS ALLEGANY COUNTY...WITH   
  THESE ROADS LIKELY TO GRADUALLY RE-OPEN AS FLOOD WATERS RECEDE.    
  CREEKS AND STREAMS WILL CONTINUE TO RUN HIGH THROUGH THE EVENING   
  HOURS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON
SMALL CREEKS AND STREAMS...AND PONDING OF WATER IN URBAN AREAS...
HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE 
AREAS AND LOW LYING SPOTS. CREEKS AND STREAMS WILL ALSO RUN 
HIGH...HINDERING TRAVEL IN RURAL LOCATIONS AS WELL.

&&

LAT...LON 4231 7831 4247 7773 4247 7772 4200 7774
      4199 7831

$$

APFFEL

782 
WGUS81 KBUF 140112
FLSBUF

FLOOD ADVISORY
NATIONAL WEATHER SERVICE BUFFALO NY
912 PM EDT FRI MAY 13 2011

NYC003-140123-
/O.EXP.KBUF.FA.Y.0021.000000T0000Z-110514T0115Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGANY NY-
912 PM EDT FRI MAY 13 2011

...THE URBAN AND SMALL STREAM FLOOD ADVISORY FOR MINOR FLOODING OF
POOR DRAINAGE AREAS WILL EXPIRE AT 915 PM EDT FOR ALLEGANY COUNTY...

LAT...LON 4231 7831 4247 7773 4247 7772 4200 7774
      4199 7831

$$

APFFEL

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 13, 4:02 PM EDT	Areal Flood Advisory	BUF	Cattaraugus, Chautauqua	5 hr
May 13, 4:17 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua	3 hr
May 13, 5:01 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario	116 min
May 13, 5:14 PM EDT	Flash Flood Warning	BUF	Allegany	5 hr
May 13, 5:20 PM EDT	Special Weather Statement	BUF	Wyoming	55 min
May 13, 5:36 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Erie, Wyoming	3 hr
May 13, 6:25 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario, Wyoming	105 min

Nearby

Areal Flood Advisories in New York, 2011 Every areal flood advisory in 2011

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.