Alert archive / Michigan / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Detroit, MI

May 23, 2011Macomb County, Saint Clair County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at May 23, 2011, 4:15 PM EDT for Macomb County, Saint Clair County, Michigan. It was in force for 45 min. 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: May 23, 2011, 4:15 PM EDT (20:15 UTC)
Expired: May 23, 2011, 5:00 PM EDT
In force: 45 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Macomb County, MI, Saint Clair County, MI

The radar

The Detroit radar (KDTX), 64 km from the middle of the area, began a volume at 20:15 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 23, 4:15 PM EDT	TSTM WND DMG	3 Wsw St. Clair Shores, MI	LARGE TREE DOWN ON POWERLINES
May 23, 4:15 PM EDT	TSTM WND DMG	4 Wsw St. Clair Shores, MI	NUMEROUS LARGE LIMBS DOWN
May 23, 4:15 PM EDT	TSTM WND GST 65	3 W St. Clair Shores, MI	TREE LIMBS DOWN
May 23, 4:20 PM EDT	TSTM WND DMG	St. Clair Shores, MI	TREES DOWN

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 23, 2:15 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 8.3 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: 181 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

689 
WUUS53 KDTX 232015
SVRDTX
MIC099-147-232115-
/O.NEW.KDTX.SV.W.0013.110523T2015Z-110523T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
415 PM EDT MON MAY 23 2011

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MACOMB COUNTY IN SOUTHEAST MICHIGAN...
  SOUTHEASTERN ST. CLAIR COUNTY IN SOUTHEAST MICHIGAN...

* UNTIL 515 PM EDT

* AT 411 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM WARREN TO GROSSE POINTE...AND MOVING NORTHEAST AT 60 MPH.
  PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  FRASER AND CLINTION TOWNSHIP AROUND 420 PM EDT.
  MOUNT CLEMENS AROUND 425 PM EDT.
  NEW BALTIMORE AROUND 430 PM EDT.
  FAIR HAVEN AND ANCHORVILLE AROUND 435 PM EDT.
  ALGONAC AROUND 440 PM EDT.
  MARINE CITY AROUND 445 PM EDT.

THE WARNING INCLUDES AREAS SURROUNDING THESE LOCATIONS...
  WARREN...             STERLING HEIGHTS...   ST. CLAIR SHORES...
  ST. CLAIR...          NEW BALTIMORE...      MOUNT CLEMENS...
  MARYSVILLE...         MARINE CITY...        MACOMB TOWNSHIP...
  HARSENS ISLAND...     ALGONAC...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

&&

LAT...LON 4261 8251 4255 8258 4254 8259 4251 8269
      4256 8266 4256 8271 4260 8272 4267 8263
      4268 8269 4266 8271 4264 8281 4256 8277
      4254 8285 4245 8286 4245 8308 4263 8309
      4293 8248 4276 8246
TIME...MOT...LOC 2015Z 245DEG 52KT 4250 8299 4244 8288
WIND...HAIL 60MPH 0.75IN

$$

MR

3 follow-up statements

070 
WWUS53 KDTX 232032
SVSDTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
432 PM EDT MON MAY 23 2011

MIC099-147-232115-
/O.CON.KDTX.SV.W.0013.000000T0000Z-110523T2115Z/
MACOMB MI-ST. CLAIR MI-
432 PM EDT MON MAY 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ST.
CLAIR AND SOUTHERN MACOMB COUNTIES UNTIL 515 PM EDT...

AT 428 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 6 MILES EAST OF MOUNT CLEMENS TO 6 MILES SOUTHWEST OF HARSENS
ISLAND...MOVING NORTHEAST AT 60 MPH. PENNY SIZE HAIL MAY ALSO
ACCOMPANY THESE DAMAGING WINDS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ALGONAC AROUND 440 PM EDT.
  MARINE CITY AROUND 445 PM EDT.

THE WARNING INCLUDES AREAS SURROUNDING THESE LOCATIONS...
  STERLING HEIGHTS...   ST. CLAIR SHORES...   ST. CLAIR...
  NEW BALTIMORE...      MOUNT CLEMENS...      MARYSVILLE...
  MARINE CITY...        MACOMB TOWNSHIP...    HARSENS ISLAND...
  ALGONAC...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS WAYNE COUNTY. SEEK SHELTER INSIDE A STURDY STRUCTURE AND STAY 
AWAY FROM WINDOWS.

&&

LAT...LON 4261 8251 4255 8258 4254 8259 4251 8269
      4256 8266 4256 8271 4260 8272 4267 8263
      4268 8269 4266 8271 4264 8281 4256 8277
      4254 8285 4248 8286 4256 8309 4263 8309
      4293 8248 4276 8246
TIME...MOT...LOC 2031Z 245DEG 52KT 4260 8270 4254 8259
WIND...HAIL 60MPH 0.75IN

$$

MR

145 
WWUS53 KDTX 232048
SVSDTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
448 PM EDT MON MAY 23 2011

MIC099-232057-
/O.CAN.KDTX.SV.W.0013.000000T0000Z-110523T2115Z/
MACOMB MI-
448 PM EDT MON MAY 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MACOMB COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4261 8251 4254 8259 4255 8264 4251 8269
      4256 8266 4256 8270 4259 8269 4258 8271
      4260 8272 4264 8266 4265 8263 4267 8263
      4268 8269 4266 8271 4281 8274 4293 8248
      4276 8246
TIME...MOT...LOC 2047Z 245DEG 52KT 4270 8241 4264 8230

$$

MIC147-232115-
/O.CON.KDTX.SV.W.0013.000000T0000Z-110523T2115Z/
ST. CLAIR MI-
448 PM EDT MON MAY 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ST.
CLAIR COUNTY UNTIL 515 PM EDT...

AT 444 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM MARINE CITY TO 9 MILES EAST OF ALGONAC...MOVING NORTHEAST AT 60
MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS SOUTHERN MACOMB COUNTY. SEEK SHELTER INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4261 8251 4254 8259 4255 8264 4251 8269
      4256 8266 4256 8270 4259 8269 4258 8271
      4260 8272 4264 8266 4265 8263 4267 8263
      4268 8269 4266 8271 4281 8274 4293 8248
      4276 8246
TIME...MOT...LOC 2047Z 245DEG 52KT 4270 8241 4264 8230
WIND...HAIL 60MPH 0.75IN

$$

MR

901 
WWUS53 KDTX 232100
SVSDTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
500 PM EDT MON MAY 23 2011

MIC147-232110-
/O.CAN.KDTX.SV.W.0013.000000T0000Z-110523T2115Z/
ST. CLAIR MI-
500 PM EDT MON MAY 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. CLAIR COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM EDT.

LAT...LON 4261 8251 4254 8259 4255 8264 4251 8269
      4256 8266 4256 8270 4259 8269 4258 8271
      4260 8272 4264 8266 4265 8263 4267 8263
      4268 8269 4266 8271 4281 8274 4293 8248
      4276 8246
TIME...MOT...LOC 2100Z 245DEG 52KT 4278 8218 4272 8207

$$

MR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 9:28 PM EDT	Severe Thunderstorm Warning	DTX	Shiawassee	22 min
May 22, 10:53 PM EDT	Special Marine Warning	DTX		28 min
May 23, 2:30 PM EDT	Special Marine Warning	DTX		105 min
May 23, 3:42 PM EDT	Severe Thunderstorm Warning	DTX	Wayne	40 min
May 23, 3:43 PM EDT	Special Marine Warning	DTX		62 min
May 23, 5:09 PM EDT	Severe Thunderstorm Warning	DTX	Washtenaw	66 min
May 23, 5:35 PM EDT	Severe Thunderstorm Warning	DTX	Wayne	55 min
May 23, 5:39 PM EDT	Special Marine Warning	DTX		96 min
May 23, 6:00 PM EDT	Areal Flood Advisory	DTX	Washtenaw, Wayne	3 hr
May 23, 6:06 PM EDT	Severe Thunderstorm Warning	DTX	Lenawee	54 min
May 23, 6:19 PM EDT	Special Marine Warning	DTX		86 min
May 23, 6:25 PM EDT	Severe Thunderstorm Warning	DTX	Monroe	80 min
May 23, 7:27 PM EDT	Severe Thunderstorm Warning	DTX	Washtenaw, Wayne	63 min
May 23, 7:34 PM EDT	Special Marine Warning	DTX		56 min
May 23, 7:50 PM EDT	Severe Thunderstorm Warning	DTX	Monroe	31 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2011 Every severe thunderstorm 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.