Alert archive / Michigan / Heat Advisories in 2011
Heat Advisory 3, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this heat advisory at Jul 20, 2011, 3:50 AM EDT for 4 counties in Michigan. It took effect at Jul 20, 2011, 8:00 AM EDT. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2011, 3:50 AM EDT (07:50 UTC)
- In effect from
- Jul 20, 2011, 8:00 AM EDT
- Expired
- Jul 21, 2011, 4:42 PM EDT
- In force
- 33 hr
- Issued by
- NWS Grand Rapids, MI
Counties Clare County, MI, Lake County, MI, Mason County, MI, Osceola County, MI
The radar
The Grand Rapids radar (KGRR), 121 km from the middle of the area, began a volume at 07:51 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 00:00Z, 7.8 hours before the alert went out and 207 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
- 1847 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1140 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
What forecasters said that day
The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before this heat advisory went out at Jul 19, 7:15 PM EDT, 8 hours 35 minutes earlier.
Area forecast discussion, Jul 19, 7:15 PM EDT, 8 hours 35 minutes before
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</html>The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:27 AM EDT | Special Marine Warning | GRR | 93 min | |
| Jul 20, 2:56 AM EDT | Special Weather Statement | GRR | Muskegon, Oceana, Ottawa | 64 min |
Nearby
Heat Advisories in Michigan, 2011Every heat advisory 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.