Alert archive / Wyoming / Frost Advisories in 2010

Frost Advisory 2, NWS Cheyenne, WY

September 6, 2010Goshen County, Platte County, Wyoming; Morrill County, Scotts Bluff County, Nebraska

NWS Cheyenne, WY issued this frost advisory at Sep 6, 2010, 3:02 PM MDT for Goshen County, Platte County, Wyoming; Morrill County, Scotts Bluff County, Nebraska. It took effect at Sep 7, 2010, 2:00 AM MDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Sep 6, 2010, 3:02 PM MDT (21:02 UTC)
In effect from
Sep 7, 2010, 2:00 AM MDT
Expired
Sep 7, 2010, 8:00 AM MDT
In force
6 hr
Issued by
NWS Cheyenne, WY

Counties Morrill County, NE, Scotts Bluff County, NE, Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 21:05 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.0 hours before the alert went out and 298 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, N. Platte/Lee Bi, NE at 12:00Z on 2010-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1030 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, N. Platte/Lee Bi, NE at 12:00Z on 2010-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -108 square meters per square second.1939587897117Sfc1 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
1030 J/kg
Mixed-layer CIN
-390 J/kg
Mixed-layer LCL
2458 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-108 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 6, 2:49 AM MDTFreeze WatchCYSAlbany, Carbon, Converse12 hr
Sep 6, 3:02 PM MDTFreeze WarningCYSAlbany, Carbon, Converse, Niobrara17 hr
Sep 6, 5:01 PM MDTRed Flag WarningCYS3 hr
Sep 5, 9:45 PM MDTWind AdvisoryCYSBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more17 hr

Nearby

Frost Advisories in Wyoming, 2010Frost Advisories in Nebraska, 2010Every frost advisory in 2010

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.