Alert archive / Michigan / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 77, NWS Gaylord, MI
NWS Gaylord, MI issued this severe thunderstorm warning at Aug 21, 2011, 4:10 PM EDT for Alpena County, Presque Isle County, Michigan. It was in force for 38 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
- Aug 21, 2011, 4:10 PM EDT (20:10 UTC)
- Expired
- Aug 21, 2011, 4:48 PM EDT
- In force
- 38 min
- Issued by
- NWS Gaylord, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Alpena County, MI, Presque Isle County, MI
The radar
The NCL Michigan radar (KAPX), 107 km from the middle of the area, began a volume at 20:13 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
Alpena, MI (KAPX), launched 12:00Z, 8.2 hours before the alert went out and 77 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
- 76 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1325 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
688
WUUS53 KAPX 212010
SVRAPX
MIC007-141-212100-
/O.NEW.KAPX.SV.W.0077.110821T2010Z-110821T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GAYLORD MI
410 PM EDT SUN AUG 21 2011
THE NATIONAL WEATHER SERVICE IN GAYLORD HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN ALPENA COUNTY IN NORTHERN LOWER MICHIGAN...
SOUTHEASTERN PRESQUE ISLE COUNTY IN NORTHERN LOWER MICHIGAN...
* UNTIL 500 PM EDT
* AT 410 PM 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 NEAR
ALPENA...AND MOVING SOUTHEAST AT 30 MPH.
* LOCATIONS IMPACTED INCLUDE...
OSSINEKE AND DEVILS LAKE.
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 4501 8327 4507 8339 4505 8343 4499 8340
4498 8344 4494 8343 4491 8332 4486 8354
4517 8379 4533 8349 4526 8337 4524 8340
4519 8336 4519 8331 4519 8335 4503 8326
4506 8324 4504 8318 4503 8318
TIME...MOT...LOC 2010Z 312DEG 27KT 4510 8341
WIND...HAIL 60MPH 1.00IN
$$2 follow-up statements
472
WWUS34 KAPX 212032
SVSAPX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GAYLORD MI
432 PM EDT SUN AUG 21 2011
MIC141-212042-
/O.CAN.KAPX.SV.W.0077.000000T0000Z-110821T2100Z/
PRESQUE ISLE MI-
432 PM EDT SUN AUG 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PRESQUE ISLE
COUNTY IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4501 8327 4507 8339 4505 8343 4494 8343
4490 8337 4486 8354 4499 8364 4516 8334
4509 8330 4508 8331 4506 8330 4505 8328
4503 8325 4502 8325
TIME...MOT...LOC 2032Z 312DEG 27KT 4499 8324
WIND...HAIL <50MPH <.50IN
$$
MIC007-212100-
/O.CON.KAPX.SV.W.0077.000000T0000Z-110821T2100Z/
ALPENA MI-
432 PM EDT SUN AUG 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
ALPENA COUNTY UNTIL 500 PM EDT...
AT 427 PM 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 9 MILES
SOUTHEAST OF ALPENA...MOVING SOUTHEAST AT 30 MPH.
LOCATIONS IMPACTED INCLUDE...
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 4501 8327 4507 8339 4505 8343 4494 8343
4490 8337 4486 8354 4499 8364 4516 8334
4509 8330 4508 8331 4506 8330 4505 8328
4503 8325 4502 8325
TIME...MOT...LOC 2032Z 312DEG 27KT 4499 8324
WIND...HAIL 60MPH 1.00IN
$$040
WWUS34 KAPX 212048
SVSAPX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GAYLORD MI
448 PM EDT SUN AUG 21 2011
MIC007-212058-
/O.CAN.KAPX.SV.W.0077.000000T0000Z-110821T2100Z/
ALPENA MI-
448 PM EDT SUN AUG 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALPENA COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
LAT...LON 4501 8327 4507 8339 4505 8343 4494 8343
4490 8337 4486 8354 4499 8364 4516 8334
4509 8330 4508 8331 4506 8330 4505 8328
4503 8325 4502 8325
TIME...MOT...LOC 2048Z 312DEG 27KT 4491 8311
WIND...HAIL <50MPH <.50IN
$$The office that day
Everything else NWS Gaylord, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 12:13 AM EDT | Special Marine Warning | APX | 47 min | |
| Aug 21, 10:33 AM EDT | Special Marine Warning | APX | 57 min | |
| Aug 21, 10:56 AM EDT | Small Craft Advisory | APX | 18 hr | |
| Aug 21, 12:57 PM EDT | Tornado Warning | APX | Alcona, Iosco | 48 min |
| Aug 21, 1:19 PM EDT | Special Marine Warning | APX | 86 min | |
| Aug 21, 2:15 PM EDT | Special Marine Warning | APX | 40 min | |
| Aug 21, 4:10 PM EDT | Special Marine Warning | APX | 60 min | |
| Aug 21, 5:23 PM EDT | Special Marine Warning | APX | 80 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.