Alert archive / Massachusetts / Flash Flood Warnings in 2009

Flash Flood Warning 5, NWS Boston/Norton, MA

June 27, 2009Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jun 27, 2009, 6:41 PM EDT for Worcester County, Massachusetts. It was in force for 2 hr. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 27, 2009, 6:41 PM EDT (22:41 UTC)
Expired: Jun 27, 2009, 8:45 PM EDT
In force: 2 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Worcester County, MA

The radar

The Boston radar (KBOX), 80 km from the middle of the area, began a volume at 22:42 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.

What was reported inside it

Time	Report	Where	Remark
Jun 27, 6:49 PM EDT	FLOOD	Worcester, MA	SKYLINE DRIVE IMPASSABLE DUE TO FLOODING
Jun 27, 6:50 PM EDT	FLOOD	Worcester, MA	AT LEAST 6 INCHES OF WATER FLOODING GODDARD MEMORIAL DRIVE/ROUTE 9 ON THE WEST SIDE
Jun 27, 7:56 PM EDT	HEAVY RAIN 2.25	Leicester, MA	IN TWO HOURS
Jun 27, 8:47 PM EDT	HEAVY RAIN 2.9	Auburn, MA	FELL IN 2 HOURS...1.59 INCHES IN 20 MINUTES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 10.7 hours before the alert went out and 163 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: 247 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 19 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.

000 
WGUS51 KBOX 272241
FFWBOX
MAC027-280045-
/O.NEW.KBOX.FF.W.0005.090627T2241Z-090628T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
641 PM EDT SAT JUN 27 2009

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...WORCESTER...LEOMINSTER...FITCHBURG...

* UNTIL 845 PM EDT

* AT 639 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM THUNDERSTORMS TRAINING OVER THE WARNED AREA.  
SOME LOCATIONS MAY RECEIVE UP TO 2 INCHES OF RAIN IN LESS THAN 1 
HOUR

EXCESSIVE RUNOFF FROM HEAVY RAIN WILL CAUSE RAPID FLOODING OF SMALL
STREAMS. FLOODING OF URBAN AREAS...INCLUDING ROADS AND UNDERPASSES IS
ALSO EXPECTED. DO NOT DRIVE THROUGH FLOODED ROADWAYS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY...INCLUDING UNDERPASSES. THE WATER MAY BE TOO DEEP TO ALLOW
VEHICLES TO CROSS SAFELY...OR THE ROADWAY MAY BE UNDERMINED.

LAT...LON 4259 7197 4260 7167 4211 7174 4217 7206

$$

FRANK

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 27, 5:41 AM EDT	Dense Fog Advisory	BOX	Franklin, Hampden, Hampshire	2 hr
Jun 27, 3:45 PM EDT	Areal Flood Advisory	BOX	Norfolk	3 hr
Jun 27, 3:51 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk	39 min
Jun 27, 4:13 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth	3 hr
Jun 27, 4:16 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	44 min
Jun 27, 4:24 PM EDT	Flash Flood Warning	BOX	Bristol, Norfolk	2 hr
Jun 27, 4:40 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	100 min
Jun 27, 5:11 PM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	3 hr
Jun 27, 5:16 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	44 min
Jun 27, 5:36 PM EDT	Special Marine Warning	BOX		54 min
Jun 27, 5:40 PM EDT	Special Marine Warning	BOX		65 min
Jun 27, 5:47 PM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	2 hr
Jun 27, 5:53 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	52 min
Jun 27, 6:02 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	43 min
Jun 27, 6:06 PM EDT	Flash Flood Warning	BOX	Middlesex, Worcester	114 min
Jun 27, 6:17 PM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	3 hr
Jun 27, 6:20 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	55 min
Jun 27, 6:24 PM EDT	Special Marine Warning	BOX		66 min
Jun 27, 6:36 PM EDT	Special Marine Warning	BOX		54 min
Jun 27, 6:40 PM EDT	Special Marine Warning	BOX		65 min
Jun 27, 6:45 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk	3 hr
Jun 27, 7:38 PM EDT	Areal Flood Advisory	BOX	Hampden, Worcester	3 hr
Jun 27, 7:44 PM EDT	Special Marine Warning	BOX		61 min

Nearby

Flash Flood Warnings in Massachusetts, 2009 Every flash flood warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.