Alert archive / Wisconsin / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Green Bay, WI

May 3, 2012Winnebago County, Wisconsin

NWS Green Bay, WI issued this flash flood warning at May 3, 2012, 1:48 AM CDT for Winnebago County, Wisconsin. It was in force for 3 hr. 1 report 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: May 3, 2012, 1:48 AM CDT (06:48 UTC)
Expired: May 3, 2012, 5:00 AM CDT
In force: 3 hr
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Flood severity: None

County Winnebago County, WI

The radar

The Green Bay radar (KGRB), 59 km from the middle of the area, began a volume at 06:49 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
May 3, 2:28 AM CDT	FLOOD	Oshkosh, WI	2 TO 3 INCHES OF RAINFALL HAS CREATED FLASH FLOODING IN THE CITY OF OSHKOSH. SOME ROADS HAVE BEEN CLOSED DUE TO 2 PLUS INCHES OF STANDING WATER.

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.8 hours before the alert went out and 58 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: 86 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 1790 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

746 
WGUS53 KGRB 030648
FFWGRB
WIC139-031000-
/O.NEW.KGRB.FF.W.0001.120503T0648Z-120503T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
148 AM CDT THU MAY 3 2012

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WINNEBAGO COUNTY IN EAST CENTRAL WISCONSIN...

* UNTIL 500 AM CDT

* AT 145 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THUNDERSTORMS
  WITH TORRENTIAL RAINFALL ACROSS THE WARNED AREA. ADDITIONAL STRONG
  THUNDERSTORMS ARE MOVING TOWARD THE AREA FROM THE SOUTHWEST. RAINFALL
  AMOUNTS OF 1 TO 2 INCHES HAVE ALREAD OCCURRED...AND ANOTHER INCH OR
  TWO IS POSSIBLE OVERNIGHT.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  OSHKOSH...OMRO...NEENAH AND MENASHA.

THE WINNEBAGO COUNTY SHERIFF AND WEATHER SPOTTERS HAVE REPORTED URBAN
FLOODING IN OSHKOSH...NEENAH AND OMRO. SOME ROADS HAVE BEEN 
BARRICADED. THE FLOOD WATERS ARE ALSO IMPACTING HIGHWAY 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 4424 8841 4403 8848 4390 8846 4390 8888
      4410 8887 4424 8860

$$

KIECKBUSCH

1 follow-up statement

353 
WGUS73 KGRB 030737
FFSGRB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
237 AM CDT THU MAY 3 2012

WIC139-031000-
/O.CON.KGRB.FF.W.0001.000000T0000Z-120503T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WINNEBAGO WI-
237 AM CDT THU MAY 3 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WINNEBAGO COUNTY UNTIL
500 AM CDT...

AT 229 AM CDT...LAW ENFORCEMENT AND WEATHER SPOTTERS REPORTED THAT 
FLASH FLOODING WAS OCCURRING IN OSHKOSH...NEENAH AND OMRO.

IN OSHKOSH...WATER WAS ONE AND A HALF TO TWO FEET DEEP ON AREA 
ROADS...INCLUDING SOME IN THE SAWYER CREEK AREA...AND NEAR THE
INTERSECTION OF HIGHWAYS 41 AND 21 NEAR THE BUTTE DES MORTS
BRIDGE. SEVERAL ROADS HAVE BEEN BARRICADED BY LAW ENFORCEMENT.

ALTHOUGH RAIN HAS DECREASED IN INTENSITY OVER THE PAST HALF HOUR...
ADDITIONAL HEAVY RAINFALL IS MOVE INTO THE WARNING AREA OVER THE
NEXT HOUR OR SO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE SIGNIFICANT FLOODING
OF SMALL CREEKS...URBAN AREAS...HIGHWAYS...STREETS AND 
UNDERPASSES...AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

PERSONS PLANNING TO TRAVEL ON HIGHWAY 41 SHOULD ANTICIPATE STANDING
WATER...PERHAPS A COUPLE FEET DEEP IN SOME AREAS. THIS IS A DANGEROUS
SITUATION...SO MOTORISTS SHOULD USE EXTREME CAUTION. 

&&

LAT...LON 4424 8841 4403 8848 4390 8846 4390 8888
      4410 8887 4424 8860

$$

KIECKBUSCH

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 2, 7:55 PM CDT	Marine Dense Fog Advisory	GRB		8 hr
May 3, 2:13 AM CDT	Flash Flood Warning	GRB	Calumet, Manitowoc	6 hr
May 3, 4:57 AM CDT	Flash Flood Warning	GRB	Winnebago	3 hr
May 3, 5:58 AM CDT	Severe Thunderstorm Warning	GRB	Vilas	34 min
May 3, 7:40 AM CDT	Areal Flood Warning	GRB	Calumet, Winnebago	4 hr
May 3, 7:58 AM CDT	Severe Thunderstorm Warning	GRB	Portage, Waushara	47 min
May 3, 8:08 AM CDT	Areal Flood Advisory	GRB	Portage, Wood	114 min
May 3, 8:37 AM CDT	Severe Thunderstorm Warning	GRB	Waushara	25 min
May 3, 10:12 AM CDT	Areal Flood Advisory	GRB	Brown, Kewaunee, Manitowoc	80 min
May 3, 10:36 AM CDT	Special Marine Warning	GRB		71 min

Nearby

Flash Flood Warnings in Wisconsin, 2012 Every flash flood warning in 2012

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.