Alert archive / Michigan / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 33, NWS Gaylord, MI

September 17, 2012Charlevoix County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Sep 17, 2012, 10:21 AM EDT for Charlevoix County, Michigan. It was in force for 14 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 17, 2012, 10:21 AM EDT (14:21 UTC)
Expired: Sep 17, 2012, 10:35 AM EDT
In force: 14 min
Issued by: NWS Gaylord, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Charlevoix County, MI

The radar

The NCL Michigan radar (KAPX), 105 km from the middle of the area, began a volume at 14:23 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.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 2.4 hours before the alert went out and 238 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: 162 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

136 
WUUS53 KAPX 171421
SVRAPX
MIC029-171445-
/O.NEW.KAPX.SV.W.0033.120917T1421Z-120917T1445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GAYLORD MI
1021 AM EDT MON SEP 17 2012

THE NATIONAL WEATHER SERVICE IN GAYLORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CHARLEVOIX COUNTY IN NORTHERN LOWER MICHIGAN...

* UNTIL 1045 AM EDT

* AT 1019 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER   
  SOUTHERN BEAVER ISLAND...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  THE SOUTHERN HALF OF BEAVER ISLAND.

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 4564 8562 4566 8562 4568 8562 4572 8548
      4570 8548 4568 8550 4564 8547 4561 8548
      4556 8555 4557 8562 4563 8564
TIME...MOT...LOC 1421Z 253DEG 37KT 4561 8550
WIND...HAIL 60MPH 1.00IN

$$

HALBLAUB

1 follow-up statement

034 
WWUS34 KAPX 171435
SVSAPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GAYLORD MI
1035 AM EDT MON SEP 17 2012

MIC029-171444-
/O.CAN.KAPX.SV.W.0033.000000T0000Z-120917T1445Z/
CHARLEVOIX MI-
1035 AM EDT MON SEP 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CHARLEVOIX COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OFF OF BEAVER ISLAND 
...AND IS NOW OVER THE OPEN WATERS OF LAKE MICHIGAN.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN GAYLORD.

LAT...LON 4564 8562 4566 8562 4568 8562 4572 8548
      4570 8548 4568 8550 4564 8547 4561 8548
      4556 8555 4557 8562 4563 8564
TIME...MOT...LOC 1434Z 253DEG 37KT 4565 8532
WIND...HAIL <50MPH <.50IN

$$

HALBLAUB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 4:32 AM EDT	Small Craft Advisory	APX		48 hr
Sep 17, 9:54 AM EDT	Special Marine Warning	APX		66 min
Sep 17, 11:08 AM EDT	Special Marine Warning	APX		67 min
Sep 17, 1:48 PM EDT	Severe Thunderstorm Warning	APX	Presque Isle	28 min
Sep 17, 1:50 PM EDT	Special Marine Warning	APX		36 min
Sep 17, 4:03 PM EDT	Severe Thunderstorm Warning	APX	Presque Isle	42 min
Sep 17, 4:35 PM EDT	Special Marine Warning	APX		40 min
Sep 17, 5:59 PM EDT	Severe Thunderstorm Warning	APX	Alpena, Montmorency, Presque Isle	58 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2012 Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.