Alert archive / Oklahoma / Frost Advisories in 2011

Frost Advisory 1, NWS Norman, OK

May 2, 201148 counties in Oklahoma

NWS Norman, OK issued this frost advisory at May 2, 2011, 2:54 AM CDT for 48 counties in Oklahoma. It took effect at May 3, 2011, 2:00 AM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: May 2, 2011, 2:54 AM CDT (07:54 UTC)
In effect from: May 3, 2011, 2:00 AM CDT
Expired: May 3, 2011, 9:00 AM CDT
In force: 7 hr
Issued by: NWS Norman, OK

All 48 counties

Alfalfa County, OK, Atoka County, OK, Beckham County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Norman radar (KTLX), 61 km from the middle of the area, began a volume at 07:56 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

Fort Worth, TX (KFWD), launched 00:00Z, 7.9 hours before the alert went out and 281 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 538 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 620 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 15.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this frost advisory went out at May 1, 10:59 PM CDT, 3 hours 55 minutes earlier.

Area forecast discussion, May 1, 10:59 PM CDT, 3 hours 55 minutes before

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Hazardous weather outlook, May 2, 1:30 AM CDT, 1 hour 24 minutes before

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In the hours before

Special weather statement, May 1, 8:57 PM CDT, 5 hours 57 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 8:08 PM CDT	Special Weather Statement	OUN	Bryan	22 min
May 1, 8:57 PM CDT	Special Weather Statement	OUN	Atoka	18 min
May 2, 2:33 AM CDT	Flash Flood Watch	OUN	Atoka, Bryan, Coal, Johnston, Marshall	8 hr
May 2, 6:32 AM CDT	Areal Flood Advisory	OUN	Bryan	3 hr

Nearby

Frost Advisories in Oklahoma, 2011 Every frost 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.