Alert archive / Michigan / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 79, NWS Gaylord, MI

August 24, 2011Iosco County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 24, 2011, 7:07 PM EDT for Iosco County, Michigan. It was in force for 38 min. 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
Aug 24, 2011, 7:07 PM EDT (23:07 UTC)
Expired
Aug 24, 2011, 7:45 PM EDT
In force
38 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Hail
0.5 in
Wind
60.0 mph

County Iosco County, MI

The radar

The NCL Michigan radar (KAPX), 120 km from the middle of the area, began a volume at 23:08 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

TimeReportWhereRemark
Aug 24, 7:15 PM EDTTSTM WND GST 35Tawas City, MI

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.

IssuedProductOfficeLasted
Aug 24, 6:00 PM EDTTornado WatchSPC5 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 12:00Z, 11.1 hours before the alert went out and 120 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-pSkew-T log-p diagram, Alpena, MI at 12:00Z on 2011-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Alpena, MI at 12:00Z on 2011-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 181 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
4 J/kg
Mixed-layer CIN
-372 J/kg
Mixed-layer LCL
1098 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
181 m²/s²
0-3 km storm-relative helicity
223 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.

281 
WUUS53 KAPX 242307
SVRAPX
MIC069-242345-
/O.NEW.KAPX.SV.W.0079.110824T2307Z-110824T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GAYLORD MI
707 PM EDT WED AUG 24 2011

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  IOSCO COUNTY IN NORTHERN LOWER MICHIGAN...

* UNTIL 745 PM EDT

* AT 703 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR PLAINFIELD TOWNSHIP...OR 10
  MILES WEST OF TAWAS CITY...AND MOVING EAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TAWAS CITY AROUND 715 PM EDT.
  EAST TAWAS AND TAWAS POINT STATE PARK AROUND 720 PM EDT.
  AU SABLE AND OSCODA AROUND 725 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4432 8334 4432 8337 4424 8345 4424 8347
      4427 8345 4427 8349 4423 8354 4420 8355
      4425 8389 4447 8355 4443 8332 4434 8332
TIME...MOT...LOC 2307Z 279DEG 42KT 4431 8366
WIND...HAIL 60MPH <.50IN

$$


ADAM/ARNOTT
2 follow-up statements
066 
WWUS34 KAPX 242330
SVSAPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GAYLORD MI
730 PM EDT WED AUG 24 2011

MIC069-242345-
/O.CON.KAPX.SV.W.0079.000000T0000Z-110824T2345Z/
IOSCO MI-
730 PM EDT WED AUG 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR IOSCO COUNTY
UNTIL 745 PM EDT...

AT 726 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 AU SABLE TO TURNER...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  TAWAS POINT STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

A TORNADO WATCH REMAINS IN EFFECT THROUGH 1 AM EDT THURSDAY.  

&&

LAT...LON 4432 8334 4432 8337 4424 8345 4424 8347
      4427 8345 4427 8349 4423 8354 4420 8355
      4425 8389 4447 8355 4443 8332 4434 8332
TIME...MOT...LOC 2329Z 274DEG 30KT 4440 8324 4417 8372
WIND...HAIL 60MPH <.50IN

$$


ADAM/ARNOTT
872 
WWUS34 KAPX 242343
SVSAPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GAYLORD MI
743 PM EDT WED AUG 24 2011

MIC069-242353-
/O.EXP.KAPX.SV.W.0079.000000T0000Z-110824T2345Z/
IOSCO MI-
743 PM EDT WED AUG 24 2011

...THE SEVERE THUNDERSTORM WARNING FOR IOSCO COUNTY WILL EXPIRE AT
745 PM EDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING ARE MOVING OUT OF THE 
WARNED AREA...HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THESE 
THUNDERSTORMS.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1 AM EDT THURSDAY.

LAT...LON 4432 8334 4432 8337 4424 8345 4424 8347
      4427 8345 4427 8349 4423 8354 4420 8355
      4425 8389 4447 8355 4443 8332 4434 8332
TIME...MOT...LOC 2343Z 274DEG 30KT 4439 8308 4416 8356
WIND...HAIL <50MPH <.50IN

$$


ADAM/ARNOTT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 9:55 PM EDTSmall Craft AdvisoryAPX34 min
Aug 23, 9:57 PM EDTSpecial Marine WarningAPX93 min
Aug 23, 10:20 PM EDTSpecial Marine WarningAPX85 min
Aug 23, 10:45 PM EDTSevere Thunderstorm WarningAPXBenzie, Leelanau, Manistee45 min
Aug 23, 11:14 PM EDTSpecial Marine WarningAPX45 min
Aug 24, 4:11 AM EDTSmall Craft AdvisoryAPX40 hr
Aug 24, 11:26 AM EDTSpecial Marine WarningAPX34 min
Aug 24, 12:36 PM EDTSpecial Marine WarningAPX28 min
Aug 24, 3:47 PM EDTGale WarningAPX12 hr
Aug 24, 4:45 PM EDTSpecial Marine WarningAPX30 min
Aug 24, 5:01 PM EDTSpecial Marine WarningAPX44 min
Aug 24, 6:53 PM EDTSpecial Marine WarningAPX83 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2011Every 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.