Alert archive / Michigan / Flash Flood Warnings in 2016

Flash Flood Warning 2, NWS Detroit, MI

July 30, 2016Washtenaw County, Michigan

NWS Detroit, MI issued this flash flood warning at Jul 30, 2016, 12:15 PM EDT for Washtenaw County, Michigan. It was in force for 5 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: Jul 30, 2016, 12:15 PM EDT (16:15 UTC)
Expired: Jul 30, 2016, 5:15 PM EDT
In force: 5 hr
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Flood severity: None

County Washtenaw County, MI

The radar

The Detroit radar (KDTX), 57 km from the middle of the area, began a volume at 16:16 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
Jul 30, 12:15 PM EDT	FLOOD	Ypsilanti, MI	NUMEROUS STREETS CLOSED AND POWER LINES DOWN DUE TO FLOODING.
Jul 30, 12:15 PM EDT	HEAVY RAIN 0	Ypsilanti, MI	NURSING HOME ROOF COLLAPSE ON PROSPECT STREET. WIDESPREAD MAJOR STREET FLOODING. ABOUT 6000 POWER OUTAGES COUNTYWIDE. RAINED SO HARD TREES WERE STRIPPED OF LEAVES...CLOGGING STORM DRAINS.
Jul 30, 1:04 PM EDT	HEAVY RAIN 1.94	6 N Ypsilanti, MI	3.5 HOUR RAINFALL TOTAL.
Jul 30, 1:04 PM EDT	HEAVY RAIN 2.35	2 E Ypsilanti, MI	3.5 HOUR RAINFALL TOTAL.

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

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 4.3 hours before the alert went out and 61 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: 81 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

866 
WGUS53 KDTX 301615
FFWDTX
MIC161-302115-
/O.NEW.KDTX.FF.W.0002.160730T1615Z-160730T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1215 PM EDT SAT JUL 30 2016

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WASHTENAW COUNTY IN SOUTHEASTERN MICHIGAN...

* UNTIL 515 PM EDT

* AT 1214 PM EDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED HEAVY RAIN
  ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY
  FALLEN. FLASH FLOODING IS ALREADY OCCURRING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ANN ARBOR...YPSILANTI...SALINE...MILAN...CHELSEA...DEXTER...
  MANCHESTER...SALEM...WILLIS...DIXBORO...WHITMORE LAKE...
  BRIDGEWATER...BARTON HILLS...HUDSON MILLS METROPARK...
  DELHI MILLS...HUDSON MILLS...PLEASANT LAKE...LYNDON TOWNSHIP...
  PITTSFIELD TOWNSHIP AND WHITTAKER.

ADDITIONAL RAINFALL AMOUNTS WILL RANGE FROM LESS THAN ONE INCH
TO UP TO 2 INCHES ACROSS THE WARNED AREA THROUGH THE AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

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.

&&

LAT...LON 4243 8355 4209 8354 4208 8397 4207 8413
      4242 8413

$$

JVC

1 follow-up statement

061 
WGUS73 KDTX 301807
FFSDTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
207 PM EDT SAT JUL 30 2016

MIC161-301817-
/O.CAN.KDTX.FF.W.0002.000000T0000Z-160730T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHTENAW MI-
207 PM EDT SAT JUL 30 2016

...THE FLASH FLOOD WARNING FOR WASHTENAW COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOOD WATERS HAVE RECEDED. FLOODING IS NO
LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 4243 8355 4209 8354 4208 8397 4207 8413
      4242 8413

$$

JVC

The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 4:23 AM EDT	Small Craft Advisory	DTX		17 hr
Jul 30, 4:48 AM EDT	Beach Hazards Statement	DTX	Bay, Huron, Saint Clair, Sanilac	17 hr
Jul 30, 5:34 AM EDT	Special Weather Statement	DTX	Shiawassee	56 min
Jul 30, 6:35 AM EDT	Special Weather Statement	DTX	Genesee, Saginaw, Shiawassee	55 min
Jul 30, 7:43 AM EDT	Areal Flood Advisory	DTX	Genesee, Saginaw, Shiawassee, Tuscola	4 hr
Jul 30, 7:51 AM EDT	Special Weather Statement	DTX	Livingston, Washtenaw	24 min
Jul 30, 8:34 AM EDT	Areal Flood Advisory	DTX	Livingston, Washtenaw	4 hr
Jul 30, 8:54 AM EDT	Special Weather Statement	DTX	Monroe, Wayne	96 min
Jul 30, 11:39 AM EDT	Special Weather Statement	DTX	Wayne	36 min
Jul 30, 12:54 PM EDT	Special Weather Statement	DTX	Oakland	51 min
Jul 30, 2:07 PM EDT	Areal Flood Advisory	DTX	Oakland	113 min
Jul 30, 6:09 PM EDT	Special Weather Statement	DTX	Lenawee, Monroe, Washtenaw	51 min
Jul 30, 6:39 PM EDT	Areal Flood Advisory	DTX	Lenawee	3 hr
Jul 30, 7:26 PM EDT	Areal Flood Advisory	DTX	Monroe	3 hr
Jul 30, 7:46 PM EDT	Special Weather Statement	DTX	Monroe, Washtenaw, Wayne	74 min

Nearby

Flash Flood Warnings in Michigan, 2016 Every flash flood warning in 2016

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.