Alert archive / Mississippi / Heat Advisories in 2012
Heat Advisory 12, NWS Memphis, TN
NWS Memphis, TN issued this heat advisory at Sep 4, 2012, 2:40 AM CDT for 7 counties in Mississippi; 4 counties in Arkansas. It took effect at Sep 4, 2012, 12:00 PM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 4, 2012, 2:40 AM CDT (07:40 UTC)
- In effect from
- Sep 4, 2012, 12:00 PM CDT
- Expired
- Sep 4, 2012, 7:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Memphis, TN
Counties Cross County, AR, Lee County, AR, Phillips County, AR, St. Francis County, AR, Calhoun County, MS, Coahoma County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tunica County, MS, Yalobusha County, MS
The radar
The Memphis radar (KNQA), 108 km from the middle of the area, began a volume at 07:46 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
Jackson, MS (KJAN), launched 00:00Z, 7.7 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.
- Mixed-layer CAPE
- 2932 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1077 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.3
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 Memphis, TN wrote its last area forecast discussion before this heat advisory went out at Sep 3, 11:57 PM CDT, 2 hours 43 minutes earlier.
Area forecast discussion, Sep 3, 11:57 PM CDT, 2 hours 43 minutes before
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</html>Hazardous weather outlook, Sep 3, 7:12 PM CDT, 7 hours 28 minutes before
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</html>Nearby
Heat Advisories in Mississippi, 2012Heat Advisories in Arkansas, 2012Every heat advisory 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.