Alert archive / Michigan / Special Weather Statements in 2018

Special Weather Statement, NWS Gaylord, MI

August 2, 2018Alcona County, Iosco County, Michigan

NWS Gaylord, MI issued this special weather statement at Aug 2, 2018, 11:21 AM EDT for Alcona County, Iosco County, Michigan. It was in force for 24 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 2, 2018, 11:21 AM EDT (15:21 UTC)
Expired
Aug 2, 2018, 11:45 AM EDT
In force
24 min
Issued by
NWS Gaylord, MI

Counties Alcona County, MI, Iosco County, MI

The radar

The NCL Michigan radar (KAPX), 110 km from the middle of the area, began a volume at 15:22 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, 3.4 hours before the alert went out and 113 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 2018-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 191 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 2018-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.193958Sfc1 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
191 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
587 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

288 
WWUS83 KAPX 021521
SPSAPX

Special Weather Statement
National Weather Service Gaylord MI
1121 AM EDT THU AUG 2 2018

MIZ030-036-042-021545-
Iosco-Arenac-Alcona-
1121 AM EDT THU AUG 2 2018

...A LINE OF THUNDERSTORMS WILL AFFECT SOUTHERN ALCONA...NORTH 
CENTRAL ARENAC AND IOSCO COUNTIES...

At 1119 AM EDT, radar indicated a line of thunderstorms located 
along a line extending from near South Branch to near National City. 
Movement was northeast at 35 mph.

Winds gusts up to 30 mph and pea size hail are possible with these 
storms.

Locations impacted include...
Oscoda, East Tawas, Tawas City, Harrisville, Au Sable, Glennie, South
Branch, Mikado, Lincoln, Plainfield Township, National City, Hale,
Wurtsmith Airfield, Wilber and Sid Town.

LAT...LON 4462 8331 4433 8333 4429 8342 4425 8344
      4428 8346 4427 8352 4423 8355 4415 8357
      4408 8372 4434 8377 4443 8389 4455 8389
      4480 8330 4473 8330 4471 8327
TIME...MOT...LOC 1519Z 230DEG 38KT 4451 8383 4439 8369 4421 8366 

$$

ALM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 9:34 AM EDTSpecial Weather StatementAPXGladwin, Ogemaw, Roscommon86 min
Aug 2, 10:44 AM EDTSpecial Weather StatementAPXArenac, Ogemaw31 min
Aug 2, 2:05 PM EDTSpecial Weather StatementAPXGladwin55 min

Nearby

Special Weather Statements in Michigan, 2018Every special weather statement in 2018

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.