Alert archive / Michigan / Flash Flood Warnings in 2011
Flash Flood Warning 2, NWS Detroit, MI
NWS Detroit, MI issued this flash flood warning at May 29, 2011, 5:55 PM EDT for Shiawassee County, Michigan. It was in force for 2 hr. 2 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
- May 29, 2011, 5:55 PM EDT (21:55 UTC)
- Expired
- May 29, 2011, 7:56 PM EDT
- In force
- 2 hr
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Flood severity
- None
County Shiawassee County, MI
The radar
The Detroit radar (KDTX), 67 km from the middle of the area, began a volume at 21:58 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 29, 7:30 PM EDT | HEAVY RAIN 1 | Corunna, MI | 1 INCH OF RAIN IN 2 HOURS. RIVER HAS RISEN SIGNIFICANLY. |
| May 29, 7:53 PM EDT | HEAVY RAIN 1 | Corunna, MI | ONE INCH OF RAIN IN UNDER TWO HOURS. |
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, 9.9 hours before the alert went out and 69 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.
- Mixed-layer CAPE
- 12 J/kg
- Mixed-layer CIN
- -294 J/kg
- Mixed-layer LCL
- 499 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 298 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
812 WGUS53 KDTX 292155 FFWDTX MIC155-300400- /O.NEW.KDTX.FF.W.0002.110529T2155Z-110530T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 555 PM EDT SUN MAY 29 2011 THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A * FLASH FLOOD WARNING FOR... SHIAWASSEE COUNTY IN SOUTHEAST MICHIGAN... * UNTIL MIDNIGHT * AT 553 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A COMPLEX OF THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATES BETWEEN A HALF INCH AND 1.5 INCHES OF RAIN HAS ALREADY FALLEN. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... DURAND...LAINGSBURG...NEW LOTHROP...OWOSSO...PERRY...BANCROFT... BYRON...CORUNNA...HENDERSON...LENNON AND MORRICE. PRECAUTIONARY/PREPAREDNESS ACTIONS... THUNERSTORMS WILL CONTINUE FOR AT LEAST ANOTHER HOUR BEFORE MOVING OFF TO THE EAST. ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE WARNED AREA. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4313 8437 4313 8393 4278 8392 4277 8436 $$ SC
2 follow-up statements
040 WGUS73 KDTX 292239 FFSDTX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 639 PM EDT SUN MAY 29 2011 MIC155-300400- /O.CON.KDTX.FF.W.0002.000000T0000Z-110530T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SHIAWASSEE MI- 639 PM EDT SUN MAY 29 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SHIAWASSEE COUNTY UNTIL MIDNIGHT EDT... AT 638 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN OVER THE AREA. RAINFALL AMOUNTS ARE ESTIMATED BETWEEN ONE AND TWO INCHES OVER THE PAST TWO HOURS. RAINFALL WILL DIMINISH OVER THE NEXT HOUR. ADDITIONAL RAINFALL AMOUNTS SHOULD BE LESS THAN A HALF AN INCH. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE... DURAND...LAINGSBURG...NEW LOTHROP...OWOSSO...PERRY...BANCROFT...BYRON...CORUNNA...HENDERSON...L ENNON AND MORRICE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4313 8437 4313 8393 4278 8392 4277 8436 $$ SC
278 WGUS73 KDTX 292356 FFSDTX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 756 PM EDT SUN MAY 29 2011 MIC155-300011- /O.CAN.KDTX.FF.W.0002.000000T0000Z-110530T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SHIAWASSEE MI- 756 PM EDT SUN MAY 29 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SHIAWASSEE COUNTY IS CANCELLED... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4313 8437 4313 8393 4278 8392 4277 8436 $$ SC
The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 11:26 AM EDT | Flood Watch | DTX | Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 5 more | 8 hr |
| May 29, 4:41 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 69 min |
| May 29, 4:55 PM EDT | Tornado Warning | DTX | Lenawee | 56 min |
| May 29, 5:02 PM EDT | Tornado Warning | DTX | Livingston, Washtenaw | 53 min |
| May 29, 5:04 PM EDT | Special Marine Warning | DTX | 71 min | |
| May 29, 5:18 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 87 min |
| May 29, 5:22 PM EDT | Tornado Warning | DTX | Genesee, Shiawassee | 83 min |
| May 29, 5:28 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 77 min |
| May 29, 5:30 PM EDT | Special Marine Warning | DTX | 75 min | |
| May 29, 5:36 PM EDT | Tornado Warning | DTX | Monroe | 45 min |
| May 29, 5:46 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 34 min |
| May 29, 5:47 PM EDT | Tornado Warning | DTX | Oakland | 42 min |
| May 29, 5:57 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 78 min |
| May 29, 6:13 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 36 min |
| May 29, 6:16 PM EDT | Special Marine Warning | DTX | 66 min |
Nearby
Flash Flood Warnings in Michigan, 2011Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.