CASE 16 - Cells to the SE propagate towards S-Pol, organize into bow-shaped convective line w/ enhanced flow behind it

8/2/04

Microphysical scans 0430 - 0730 Z, 3h

 

 

SYNOPTIC CONDITIONS SUMMARY:

 

Synoptic feature map -

IOP status - No IOP called a this time.

 

Low-level (700 mb) moisture prevalent in much of Tier 1 domain, including S-Pol region.

 

Small jet has formed between cyclonic circulation off the east coast of Mexico and 500 mb anticyclone to the NW - jet is bring moisture into Tier 1 from Gulf of Mexico.

 

Tropical Wave #28 tracking westward, will be due S of Mazatlan (at 10 deg N) in the next day or two.

 

 

 

Day 0 forecast discussion text

 

Winds

200 mb - model.ETA.200408020000.06_200mb_wnd.gif

500 mb - model.ETA.200408020000.06_500mb_wnd.gif

700 mb - model.ETA.200408020000.06_700mb_wnd.gif

850 mb - model.ETA.200408020000.06_850mb_wnd.gif

 

 

 

EVENT SUMMARY: Cells formed to the SE of S-Pol, propagated towards the NW into the S-Pol domain. Cells organized into a bow-shaped convective line, located to the E/NE of S-Pol, at ~0530 Z. By 0700 Z, convection was dissipating.

 

0539Z, GOES-10 Thermal IR

 

24 h precipitation totals -

 

S-POL SUMMARY:

 

SCAN OVERVIEW:

 

0232 Z

Mesoscale system propagating into S-Pol domain from the SE.

 

0230Z, Base reflectivity

 

0300 Z

SE quadrant filling up with storms.

 

0300Z, Base reflectivity

 

0430 Z

Begin Microphysical Scanning, Switching to MicroNear135: Centered sectors on 90 deg. Strongest storms due E at ~40-60 km, moving to the NW.

 

0430Z, Base reflectivity

 

0500 - 0600 Z

Some new cell growth observed, but overall intensity was waning. At 0530 Z, a bow-shaped emerged from 45-90 deg at 120-150 km range.

 

0530Z, Base reflectivity

 

0619 Z

Easterly flow enhanced behind the bow-shaped convective line to the E/NE as it moves westward.

 

0615Z, Base reflectivity

 

0615Z, Base radial velocity

 

0745 Z

End Microphysical Scanning, Stopping radar: Switched to ClimoNear at 0748 Z.